Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2094 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dpll.c b/drivers/gpu/drm/i915/display/intel_dpll.c
new file mode 100644
index 000000000..999badfe2
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_dpll.c
@@ -0,0 +1,2094 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/string_helpers.h>
+
+#include "i915_reg.h"
+#include "intel_crtc.h"
+#include "intel_cx0_phy.h"
+#include "intel_de.h"
+#include "intel_display.h"
+#include "intel_display_types.h"
+#include "intel_dpio_phy.h"
+#include "intel_dpll.h"
+#include "intel_lvds.h"
+#include "intel_panel.h"
+#include "intel_pps.h"
+#include "intel_snps_phy.h"
+#include "vlv_sideband.h"
+
+struct intel_dpll_funcs {
+	int (*crtc_compute_clock)(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc);
+	int (*crtc_get_shared_dpll)(struct intel_atomic_state *state,
+				    struct intel_crtc *crtc);
+};
+
+struct intel_limit {
+	struct {
+		int min, max;
+	} dot, vco, n, m, m1, m2, p, p1;
+
+	struct {
+		int dot_limit;
+		int p2_slow, p2_fast;
+	} p2;
+};
+static const struct intel_limit intel_limits_i8xx_dac = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 908000, .max = 1512000 },
+	.n = { .min = 2, .max = 16 },
+	.m = { .min = 96, .max = 140 },
+	.m1 = { .min = 18, .max = 26 },
+	.m2 = { .min = 6, .max = 16 },
+	.p = { .min = 4, .max = 128 },
+	.p1 = { .min = 2, .max = 33 },
+	.p2 = { .dot_limit = 165000,
+		.p2_slow = 4, .p2_fast = 2 },
+};
+
+static const struct intel_limit intel_limits_i8xx_dvo = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 908000, .max = 1512000 },
+	.n = { .min = 2, .max = 16 },
+	.m = { .min = 96, .max = 140 },
+	.m1 = { .min = 18, .max = 26 },
+	.m2 = { .min = 6, .max = 16 },
+	.p = { .min = 4, .max = 128 },
+	.p1 = { .min = 2, .max = 33 },
+	.p2 = { .dot_limit = 165000,
+		.p2_slow = 4, .p2_fast = 4 },
+};
+
+static const struct intel_limit intel_limits_i8xx_lvds = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 908000, .max = 1512000 },
+	.n = { .min = 2, .max = 16 },
+	.m = { .min = 96, .max = 140 },
+	.m1 = { .min = 18, .max = 26 },
+	.m2 = { .min = 6, .max = 16 },
+	.p = { .min = 4, .max = 128 },
+	.p1 = { .min = 1, .max = 6 },
+	.p2 = { .dot_limit = 165000,
+		.p2_slow = 14, .p2_fast = 7 },
+};
+
+static const struct intel_limit intel_limits_i9xx_sdvo = {
+	.dot = { .min = 20000, .max = 400000 },
+	.vco = { .min = 1400000, .max = 2800000 },
+	.n = { .min = 1, .max = 6 },
+	.m = { .min = 70, .max = 120 },
+	.m1 = { .min = 8, .max = 18 },
+	.m2 = { .min = 3, .max = 7 },
+	.p = { .min = 5, .max = 80 },
+	.p1 = { .min = 1, .max = 8 },
+	.p2 = { .dot_limit = 200000,
+		.p2_slow = 10, .p2_fast = 5 },
+};
+
+static const struct intel_limit intel_limits_i9xx_lvds = {
+	.dot = { .min = 20000, .max = 400000 },
+	.vco = { .min = 1400000, .max = 2800000 },
+	.n = { .min = 1, .max = 6 },
+	.m = { .min = 70, .max = 120 },
+	.m1 = { .min = 8, .max = 18 },
+	.m2 = { .min = 3, .max = 7 },
+	.p = { .min = 7, .max = 98 },
+	.p1 = { .min = 1, .max = 8 },
+	.p2 = { .dot_limit = 112000,
+		.p2_slow = 14, .p2_fast = 7 },
+};
+
+
+static const struct intel_limit intel_limits_g4x_sdvo = {
+	.dot = { .min = 25000, .max = 270000 },
+	.vco = { .min = 1750000, .max = 3500000},
+	.n = { .min = 1, .max = 4 },
+	.m = { .min = 104, .max = 138 },
+	.m1 = { .min = 17, .max = 23 },
+	.m2 = { .min = 5, .max = 11 },
+	.p = { .min = 10, .max = 30 },
+	.p1 = { .min = 1, .max = 3},
+	.p2 = { .dot_limit = 270000,
+		.p2_slow = 10,
+		.p2_fast = 10
+	},
+};
+
+static const struct intel_limit intel_limits_g4x_hdmi = {
+	.dot = { .min = 22000, .max = 400000 },
+	.vco = { .min = 1750000, .max = 3500000},
+	.n = { .min = 1, .max = 4 },
+	.m = { .min = 104, .max = 138 },
+	.m1 = { .min = 16, .max = 23 },
+	.m2 = { .min = 5, .max = 11 },
+	.p = { .min = 5, .max = 80 },
+	.p1 = { .min = 1, .max = 8},
+	.p2 = { .dot_limit = 165000,
+		.p2_slow = 10, .p2_fast = 5 },
+};
+
+static const struct intel_limit intel_limits_g4x_single_channel_lvds = {
+	.dot = { .min = 20000, .max = 115000 },
+	.vco = { .min = 1750000, .max = 3500000 },
+	.n = { .min = 1, .max = 3 },
+	.m = { .min = 104, .max = 138 },
+	.m1 = { .min = 17, .max = 23 },
+	.m2 = { .min = 5, .max = 11 },
+	.p = { .min = 28, .max = 112 },
+	.p1 = { .min = 2, .max = 8 },
+	.p2 = { .dot_limit = 0,
+		.p2_slow = 14, .p2_fast = 14
+	},
+};
+
+static const struct intel_limit intel_limits_g4x_dual_channel_lvds = {
+	.dot = { .min = 80000, .max = 224000 },
+	.vco = { .min = 1750000, .max = 3500000 },
+	.n = { .min = 1, .max = 3 },
+	.m = { .min = 104, .max = 138 },
+	.m1 = { .min = 17, .max = 23 },
+	.m2 = { .min = 5, .max = 11 },
+	.p = { .min = 14, .max = 42 },
+	.p1 = { .min = 2, .max = 6 },
+	.p2 = { .dot_limit = 0,
+		.p2_slow = 7, .p2_fast = 7
+	},
+};
+
+static const struct intel_limit pnv_limits_sdvo = {
+	.dot = { .min = 20000, .max = 400000},
+	.vco = { .min = 1700000, .max = 3500000 },
+	/* Pineview's Ncounter is a ring counter */
+	.n = { .min = 3, .max = 6 },
+	.m = { .min = 2, .max = 256 },
+	/* Pineview only has one combined m divider, which we treat as m2. */
+	.m1 = { .min = 0, .max = 0 },
+	.m2 = { .min = 0, .max = 254 },
+	.p = { .min = 5, .max = 80 },
+	.p1 = { .min = 1, .max = 8 },
+	.p2 = { .dot_limit = 200000,
+		.p2_slow = 10, .p2_fast = 5 },
+};
+
+static const struct intel_limit pnv_limits_lvds = {
+	.dot = { .min = 20000, .max = 400000 },
+	.vco = { .min = 1700000, .max = 3500000 },
+	.n = { .min = 3, .max = 6 },
+	.m = { .min = 2, .max = 256 },
+	.m1 = { .min = 0, .max = 0 },
+	.m2 = { .min = 0, .max = 254 },
+	.p = { .min = 7, .max = 112 },
+	.p1 = { .min = 1, .max = 8 },
+	.p2 = { .dot_limit = 112000,
+		.p2_slow = 14, .p2_fast = 14 },
+};
+
+/* Ironlake / Sandybridge
+ *
+ * We calculate clock using (register_value + 2) for N/M1/M2, so here
+ * the range value for them is (actual_value - 2).
+ */
+static const struct intel_limit ilk_limits_dac = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 1760000, .max = 3510000 },
+	.n = { .min = 1, .max = 5 },
+	.m = { .min = 79, .max = 127 },
+	.m1 = { .min = 12, .max = 22 },
+	.m2 = { .min = 5, .max = 9 },
+	.p = { .min = 5, .max = 80 },
+	.p1 = { .min = 1, .max = 8 },
+	.p2 = { .dot_limit = 225000,
+		.p2_slow = 10, .p2_fast = 5 },
+};
+
+static const struct intel_limit ilk_limits_single_lvds = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 1760000, .max = 3510000 },
+	.n = { .min = 1, .max = 3 },
+	.m = { .min = 79, .max = 118 },
+	.m1 = { .min = 12, .max = 22 },
+	.m2 = { .min = 5, .max = 9 },
+	.p = { .min = 28, .max = 112 },
+	.p1 = { .min = 2, .max = 8 },
+	.p2 = { .dot_limit = 225000,
+		.p2_slow = 14, .p2_fast = 14 },
+};
+
+static const struct intel_limit ilk_limits_dual_lvds = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 1760000, .max = 3510000 },
+	.n = { .min = 1, .max = 3 },
+	.m = { .min = 79, .max = 127 },
+	.m1 = { .min = 12, .max = 22 },
+	.m2 = { .min = 5, .max = 9 },
+	.p = { .min = 14, .max = 56 },
+	.p1 = { .min = 2, .max = 8 },
+	.p2 = { .dot_limit = 225000,
+		.p2_slow = 7, .p2_fast = 7 },
+};
+
+/* LVDS 100mhz refclk limits. */
+static const struct intel_limit ilk_limits_single_lvds_100m = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 1760000, .max = 3510000 },
+	.n = { .min = 1, .max = 2 },
+	.m = { .min = 79, .max = 126 },
+	.m1 = { .min = 12, .max = 22 },
+	.m2 = { .min = 5, .max = 9 },
+	.p = { .min = 28, .max = 112 },
+	.p1 = { .min = 2, .max = 8 },
+	.p2 = { .dot_limit = 225000,
+		.p2_slow = 14, .p2_fast = 14 },
+};
+
+static const struct intel_limit ilk_limits_dual_lvds_100m = {
+	.dot = { .min = 25000, .max = 350000 },
+	.vco = { .min = 1760000, .max = 3510000 },
+	.n = { .min = 1, .max = 3 },
+	.m = { .min = 79, .max = 126 },
+	.m1 = { .min = 12, .max = 22 },
+	.m2 = { .min = 5, .max = 9 },
+	.p = { .min = 14, .max = 42 },
+	.p1 = { .min = 2, .max = 6 },
+	.p2 = { .dot_limit = 225000,
+		.p2_slow = 7, .p2_fast = 7 },
+};
+
+static const struct intel_limit intel_limits_vlv = {
+	 /*
+	  * These are based on the data rate limits (measured in fast clocks)
+	  * since those are the strictest limits we have. The fast
+	  * clock and actual rate limits are more relaxed, so checking
+	  * them would make no difference.
+	  */
+	.dot = { .min = 25000, .max = 270000 },
+	.vco = { .min = 4000000, .max = 6000000 },
+	.n = { .min = 1, .max = 7 },
+	.m1 = { .min = 2, .max = 3 },
+	.m2 = { .min = 11, .max = 156 },
+	.p1 = { .min = 2, .max = 3 },
+	.p2 = { .p2_slow = 2, .p2_fast = 20 }, /* slow=min, fast=max */
+};
+
+static const struct intel_limit intel_limits_chv = {
+	/*
+	 * These are based on the data rate limits (measured in fast clocks)
+	 * since those are the strictest limits we have.  The fast
+	 * clock and actual rate limits are more relaxed, so checking
+	 * them would make no difference.
+	 */
+	.dot = { .min = 25000, .max = 540000 },
+	.vco = { .min = 4800000, .max = 6480000 },
+	.n = { .min = 1, .max = 1 },
+	.m1 = { .min = 2, .max = 2 },
+	.m2 = { .min = 24 << 22, .max = 175 << 22 },
+	.p1 = { .min = 2, .max = 4 },
+	.p2 = {	.p2_slow = 1, .p2_fast = 14 },
+};
+
+static const struct intel_limit intel_limits_bxt = {
+	.dot = { .min = 25000, .max = 594000 },
+	.vco = { .min = 4800000, .max = 6700000 },
+	.n = { .min = 1, .max = 1 },
+	.m1 = { .min = 2, .max = 2 },
+	/* FIXME: find real m2 limits */
+	.m2 = { .min = 2 << 22, .max = 255 << 22 },
+	.p1 = { .min = 2, .max = 4 },
+	.p2 = { .p2_slow = 1, .p2_fast = 20 },
+};
+
+/*
+ * Platform specific helpers to calculate the port PLL loopback- (clock.m),
+ * and post-divider (clock.p) values, pre- (clock.vco) and post-divided fast
+ * (clock.dot) clock rates. This fast dot clock is fed to the port's IO logic.
+ * The helpers' return value is the rate of the clock that is fed to the
+ * display engine's pipe which can be the above fast dot clock rate or a
+ * divided-down version of it.
+ */
+/* m1 is reserved as 0 in Pineview, n is a ring counter */
+int pnv_calc_dpll_params(int refclk, struct dpll *clock)
+{
+	clock->m = clock->m2 + 2;
+	clock->p = clock->p1 * clock->p2;
+	if (WARN_ON(clock->n == 0 || clock->p == 0))
+		return 0;
+	clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
+	clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
+
+	return clock->dot;
+}
+
+static u32 i9xx_dpll_compute_m(const struct dpll *dpll)
+{
+	return 5 * (dpll->m1 + 2) + (dpll->m2 + 2);
+}
+
+int i9xx_calc_dpll_params(int refclk, struct dpll *clock)
+{
+	clock->m = i9xx_dpll_compute_m(clock);
+	clock->p = clock->p1 * clock->p2;
+	if (WARN_ON(clock->n + 2 == 0 || clock->p == 0))
+		return 0;
+	clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n + 2);
+	clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
+
+	return clock->dot;
+}
+
+int vlv_calc_dpll_params(int refclk, struct dpll *clock)
+{
+	clock->m = clock->m1 * clock->m2;
+	clock->p = clock->p1 * clock->p2 * 5;
+	if (WARN_ON(clock->n == 0 || clock->p == 0))
+		return 0;
+	clock->vco = DIV_ROUND_CLOSEST(refclk * clock->m, clock->n);
+	clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
+
+	return clock->dot;
+}
+
+int chv_calc_dpll_params(int refclk, struct dpll *clock)
+{
+	clock->m = clock->m1 * clock->m2;
+	clock->p = clock->p1 * clock->p2 * 5;
+	if (WARN_ON(clock->n == 0 || clock->p == 0))
+		return 0;
+	clock->vco = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(refclk, clock->m),
+					   clock->n << 22);
+	clock->dot = DIV_ROUND_CLOSEST(clock->vco, clock->p);
+
+	return clock->dot;
+}
+
+/*
+ * Returns whether the given set of divisors are valid for a given refclk with
+ * the given connectors.
+ */
+static bool intel_pll_is_valid(struct drm_i915_private *dev_priv,
+			       const struct intel_limit *limit,
+			       const struct dpll *clock)
+{
+	if (clock->n < limit->n.min || limit->n.max < clock->n)
+		return false;
+	if (clock->p1 < limit->p1.min || limit->p1.max < clock->p1)
+		return false;
+	if (clock->m2 < limit->m2.min || limit->m2.max < clock->m2)
+		return false;
+	if (clock->m1 < limit->m1.min || limit->m1.max < clock->m1)
+		return false;
+
+	if (!IS_PINEVIEW(dev_priv) && !IS_LP(dev_priv))
+		if (clock->m1 <= clock->m2)
+			return false;
+
+	if (!IS_LP(dev_priv)) {
+		if (clock->p < limit->p.min || limit->p.max < clock->p)
+			return false;
+		if (clock->m < limit->m.min || limit->m.max < clock->m)
+			return false;
+	}
+
+	if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
+		return false;
+	/* XXX: We may need to be checking "Dot clock" depending on the multiplier,
+	 * connector, etc., rather than just a single range.
+	 */
+	if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
+		return false;
+
+	return true;
+}
+
+static int
+i9xx_select_p2_div(const struct intel_limit *limit,
+		   const struct intel_crtc_state *crtc_state,
+		   int target)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		/*
+		 * For LVDS just rely on its current settings for dual-channel.
+		 * We haven't figured out how to reliably set up different
+		 * single/dual channel state, if we even can.
+		 */
+		if (intel_is_dual_link_lvds(dev_priv))
+			return limit->p2.p2_fast;
+		else
+			return limit->p2.p2_slow;
+	} else {
+		if (target < limit->p2.dot_limit)
+			return limit->p2.p2_slow;
+		else
+			return limit->p2.p2_fast;
+	}
+}
+
+/*
+ * Returns a set of divisors for the desired target clock with the given
+ * refclk, or FALSE.
+ *
+ * Target and reference clocks are specified in kHz.
+ *
+ * If match_clock is provided, then best_clock P divider must match the P
+ * divider from @match_clock used for LVDS downclocking.
+ */
+static bool
+i9xx_find_best_dpll(const struct intel_limit *limit,
+		    struct intel_crtc_state *crtc_state,
+		    int target, int refclk,
+		    const struct dpll *match_clock,
+		    struct dpll *best_clock)
+{
+	struct drm_device *dev = crtc_state->uapi.crtc->dev;
+	struct dpll clock;
+	int err = target;
+
+	memset(best_clock, 0, sizeof(*best_clock));
+
+	clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);
+
+	for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
+	     clock.m1++) {
+		for (clock.m2 = limit->m2.min;
+		     clock.m2 <= limit->m2.max; clock.m2++) {
+			if (clock.m2 >= clock.m1)
+				break;
+			for (clock.n = limit->n.min;
+			     clock.n <= limit->n.max; clock.n++) {
+				for (clock.p1 = limit->p1.min;
+					clock.p1 <= limit->p1.max; clock.p1++) {
+					int this_err;
+
+					i9xx_calc_dpll_params(refclk, &clock);
+					if (!intel_pll_is_valid(to_i915(dev),
+								limit,
+								&clock))
+						continue;
+					if (match_clock &&
+					    clock.p != match_clock->p)
+						continue;
+
+					this_err = abs(clock.dot - target);
+					if (this_err < err) {
+						*best_clock = clock;
+						err = this_err;
+					}
+				}
+			}
+		}
+	}
+
+	return (err != target);
+}
+
+/*
+ * Returns a set of divisors for the desired target clock with the given
+ * refclk, or FALSE.
+ *
+ * Target and reference clocks are specified in kHz.
+ *
+ * If match_clock is provided, then best_clock P divider must match the P
+ * divider from @match_clock used for LVDS downclocking.
+ */
+static bool
+pnv_find_best_dpll(const struct intel_limit *limit,
+		   struct intel_crtc_state *crtc_state,
+		   int target, int refclk,
+		   const struct dpll *match_clock,
+		   struct dpll *best_clock)
+{
+	struct drm_device *dev = crtc_state->uapi.crtc->dev;
+	struct dpll clock;
+	int err = target;
+
+	memset(best_clock, 0, sizeof(*best_clock));
+
+	clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);
+
+	for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
+	     clock.m1++) {
+		for (clock.m2 = limit->m2.min;
+		     clock.m2 <= limit->m2.max; clock.m2++) {
+			for (clock.n = limit->n.min;
+			     clock.n <= limit->n.max; clock.n++) {
+				for (clock.p1 = limit->p1.min;
+					clock.p1 <= limit->p1.max; clock.p1++) {
+					int this_err;
+
+					pnv_calc_dpll_params(refclk, &clock);
+					if (!intel_pll_is_valid(to_i915(dev),
+								limit,
+								&clock))
+						continue;
+					if (match_clock &&
+					    clock.p != match_clock->p)
+						continue;
+
+					this_err = abs(clock.dot - target);
+					if (this_err < err) {
+						*best_clock = clock;
+						err = this_err;
+					}
+				}
+			}
+		}
+	}
+
+	return (err != target);
+}
+
+/*
+ * Returns a set of divisors for the desired target clock with the given
+ * refclk, or FALSE.
+ *
+ * Target and reference clocks are specified in kHz.
+ *
+ * If match_clock is provided, then best_clock P divider must match the P
+ * divider from @match_clock used for LVDS downclocking.
+ */
+static bool
+g4x_find_best_dpll(const struct intel_limit *limit,
+		   struct intel_crtc_state *crtc_state,
+		   int target, int refclk,
+		   const struct dpll *match_clock,
+		   struct dpll *best_clock)
+{
+	struct drm_device *dev = crtc_state->uapi.crtc->dev;
+	struct dpll clock;
+	int max_n;
+	bool found = false;
+	/* approximately equals target * 0.00585 */
+	int err_most = (target >> 8) + (target >> 9);
+
+	memset(best_clock, 0, sizeof(*best_clock));
+
+	clock.p2 = i9xx_select_p2_div(limit, crtc_state, target);
+
+	max_n = limit->n.max;
+	/* based on hardware requirement, prefer smaller n to precision */
+	for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
+		/* based on hardware requirement, prefere larger m1,m2 */
+		for (clock.m1 = limit->m1.max;
+		     clock.m1 >= limit->m1.min; clock.m1--) {
+			for (clock.m2 = limit->m2.max;
+			     clock.m2 >= limit->m2.min; clock.m2--) {
+				for (clock.p1 = limit->p1.max;
+				     clock.p1 >= limit->p1.min; clock.p1--) {
+					int this_err;
+
+					i9xx_calc_dpll_params(refclk, &clock);
+					if (!intel_pll_is_valid(to_i915(dev),
+								limit,
+								&clock))
+						continue;
+
+					this_err = abs(clock.dot - target);
+					if (this_err < err_most) {
+						*best_clock = clock;
+						err_most = this_err;
+						max_n = clock.n;
+						found = true;
+					}
+				}
+			}
+		}
+	}
+	return found;
+}
+
+/*
+ * Check if the calculated PLL configuration is more optimal compared to the
+ * best configuration and error found so far. Return the calculated error.
+ */
+static bool vlv_PLL_is_optimal(struct drm_device *dev, int target_freq,
+			       const struct dpll *calculated_clock,
+			       const struct dpll *best_clock,
+			       unsigned int best_error_ppm,
+			       unsigned int *error_ppm)
+{
+	/*
+	 * For CHV ignore the error and consider only the P value.
+	 * Prefer a bigger P value based on HW requirements.
+	 */
+	if (IS_CHERRYVIEW(to_i915(dev))) {
+		*error_ppm = 0;
+
+		return calculated_clock->p > best_clock->p;
+	}
+
+	if (drm_WARN_ON_ONCE(dev, !target_freq))
+		return false;
+
+	*error_ppm = div_u64(1000000ULL *
+				abs(target_freq - calculated_clock->dot),
+			     target_freq);
+	/*
+	 * Prefer a better P value over a better (smaller) error if the error
+	 * is small. Ensure this preference for future configurations too by
+	 * setting the error to 0.
+	 */
+	if (*error_ppm < 100 && calculated_clock->p > best_clock->p) {
+		*error_ppm = 0;
+
+		return true;
+	}
+
+	return *error_ppm + 10 < best_error_ppm;
+}
+
+/*
+ * Returns a set of divisors for the desired target clock with the given
+ * refclk, or FALSE.
+ */
+static bool
+vlv_find_best_dpll(const struct intel_limit *limit,
+		   struct intel_crtc_state *crtc_state,
+		   int target, int refclk,
+		   const struct dpll *match_clock,
+		   struct dpll *best_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_device *dev = crtc->base.dev;
+	struct dpll clock;
+	unsigned int bestppm = 1000000;
+	/* min update 19.2 MHz */
+	int max_n = min(limit->n.max, refclk / 19200);
+	bool found = false;
+
+	memset(best_clock, 0, sizeof(*best_clock));
+
+	/* based on hardware requirement, prefer smaller n to precision */
+	for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
+		for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
+			for (clock.p2 = limit->p2.p2_fast; clock.p2 >= limit->p2.p2_slow;
+			     clock.p2 -= clock.p2 > 10 ? 2 : 1) {
+				clock.p = clock.p1 * clock.p2 * 5;
+				/* based on hardware requirement, prefer bigger m1,m2 values */
+				for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
+					unsigned int ppm;
+
+					clock.m2 = DIV_ROUND_CLOSEST(target * clock.p * clock.n,
+								     refclk * clock.m1);
+
+					vlv_calc_dpll_params(refclk, &clock);
+
+					if (!intel_pll_is_valid(to_i915(dev),
+								limit,
+								&clock))
+						continue;
+
+					if (!vlv_PLL_is_optimal(dev, target,
+								&clock,
+								best_clock,
+								bestppm, &ppm))
+						continue;
+
+					*best_clock = clock;
+					bestppm = ppm;
+					found = true;
+				}
+			}
+		}
+	}
+
+	return found;
+}
+
+/*
+ * Returns a set of divisors for the desired target clock with the given
+ * refclk, or FALSE.
+ */
+static bool
+chv_find_best_dpll(const struct intel_limit *limit,
+		   struct intel_crtc_state *crtc_state,
+		   int target, int refclk,
+		   const struct dpll *match_clock,
+		   struct dpll *best_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_device *dev = crtc->base.dev;
+	unsigned int best_error_ppm;
+	struct dpll clock;
+	u64 m2;
+	int found = false;
+
+	memset(best_clock, 0, sizeof(*best_clock));
+	best_error_ppm = 1000000;
+
+	/*
+	 * Based on hardware doc, the n always set to 1, and m1 always
+	 * set to 2.  If requires to support 200Mhz refclk, we need to
+	 * revisit this because n may not 1 anymore.
+	 */
+	clock.n = 1;
+	clock.m1 = 2;
+
+	for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) {
+		for (clock.p2 = limit->p2.p2_fast;
+				clock.p2 >= limit->p2.p2_slow;
+				clock.p2 -= clock.p2 > 10 ? 2 : 1) {
+			unsigned int error_ppm;
+
+			clock.p = clock.p1 * clock.p2 * 5;
+
+			m2 = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(target, clock.p * clock.n) << 22,
+						   refclk * clock.m1);
+
+			if (m2 > INT_MAX/clock.m1)
+				continue;
+
+			clock.m2 = m2;
+
+			chv_calc_dpll_params(refclk, &clock);
+
+			if (!intel_pll_is_valid(to_i915(dev), limit, &clock))
+				continue;
+
+			if (!vlv_PLL_is_optimal(dev, target, &clock, best_clock,
+						best_error_ppm, &error_ppm))
+				continue;
+
+			*best_clock = clock;
+			best_error_ppm = error_ppm;
+			found = true;
+		}
+	}
+
+	return found;
+}
+
+bool bxt_find_best_dpll(struct intel_crtc_state *crtc_state,
+			struct dpll *best_clock)
+{
+	const struct intel_limit *limit = &intel_limits_bxt;
+	int refclk = 100000;
+
+	return chv_find_best_dpll(limit, crtc_state,
+				  crtc_state->port_clock, refclk,
+				  NULL, best_clock);
+}
+
+u32 i9xx_dpll_compute_fp(const struct dpll *dpll)
+{
+	return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
+}
+
+static u32 pnv_dpll_compute_fp(const struct dpll *dpll)
+{
+	return (1 << dpll->n) << 16 | dpll->m2;
+}
+
+static void i9xx_update_pll_dividers(struct intel_crtc_state *crtc_state,
+				     const struct dpll *clock,
+				     const struct dpll *reduced_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 fp, fp2;
+
+	if (IS_PINEVIEW(dev_priv)) {
+		fp = pnv_dpll_compute_fp(clock);
+		fp2 = pnv_dpll_compute_fp(reduced_clock);
+	} else {
+		fp = i9xx_dpll_compute_fp(clock);
+		fp2 = i9xx_dpll_compute_fp(reduced_clock);
+	}
+
+	crtc_state->dpll_hw_state.fp0 = fp;
+	crtc_state->dpll_hw_state.fp1 = fp2;
+}
+
+static void i9xx_compute_dpll(struct intel_crtc_state *crtc_state,
+			      const struct dpll *clock,
+			      const struct dpll *reduced_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 dpll;
+
+	i9xx_update_pll_dividers(crtc_state, clock, reduced_clock);
+
+	dpll = DPLL_VGA_MODE_DIS;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
+		dpll |= DPLLB_MODE_LVDS;
+	else
+		dpll |= DPLLB_MODE_DAC_SERIAL;
+
+	if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
+	    IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
+		dpll |= (crtc_state->pixel_multiplier - 1)
+			<< SDVO_MULTIPLIER_SHIFT_HIRES;
+	}
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
+		dpll |= DPLL_SDVO_HIGH_SPEED;
+
+	if (intel_crtc_has_dp_encoder(crtc_state))
+		dpll |= DPLL_SDVO_HIGH_SPEED;
+
+	/* compute bitmask from p1 value */
+	if (IS_G4X(dev_priv)) {
+		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
+		dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
+	} else if (IS_PINEVIEW(dev_priv)) {
+		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW;
+		WARN_ON(reduced_clock->p1 != clock->p1);
+	} else {
+		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
+		WARN_ON(reduced_clock->p1 != clock->p1);
+	}
+
+	switch (clock->p2) {
+	case 5:
+		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
+		break;
+	case 7:
+		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
+		break;
+	case 10:
+		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
+		break;
+	case 14:
+		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
+		break;
+	}
+	WARN_ON(reduced_clock->p2 != clock->p2);
+
+	if (DISPLAY_VER(dev_priv) >= 4)
+		dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);
+
+	if (crtc_state->sdvo_tv_clock)
+		dpll |= PLL_REF_INPUT_TVCLKINBC;
+	else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
+		 intel_panel_use_ssc(dev_priv))
+		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
+	else
+		dpll |= PLL_REF_INPUT_DREFCLK;
+
+	dpll |= DPLL_VCO_ENABLE;
+	crtc_state->dpll_hw_state.dpll = dpll;
+
+	if (DISPLAY_VER(dev_priv) >= 4) {
+		u32 dpll_md = (crtc_state->pixel_multiplier - 1)
+			<< DPLL_MD_UDI_MULTIPLIER_SHIFT;
+		crtc_state->dpll_hw_state.dpll_md = dpll_md;
+	}
+}
+
+static void i8xx_compute_dpll(struct intel_crtc_state *crtc_state,
+			      const struct dpll *clock,
+			      const struct dpll *reduced_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 dpll;
+
+	i9xx_update_pll_dividers(crtc_state, clock, reduced_clock);
+
+	dpll = DPLL_VGA_MODE_DIS;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
+	} else {
+		if (clock->p1 == 2)
+			dpll |= PLL_P1_DIVIDE_BY_TWO;
+		else
+			dpll |= (clock->p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
+		if (clock->p2 == 4)
+			dpll |= PLL_P2_DIVIDE_BY_4;
+	}
+	WARN_ON(reduced_clock->p1 != clock->p1);
+	WARN_ON(reduced_clock->p2 != clock->p2);
+
+	/*
+	 * Bspec:
+	 * "[Almador Errata}: For the correct operation of the muxed DVO pins
+	 *  (GDEVSELB/I2Cdata, GIRDBY/I2CClk) and (GFRAMEB/DVI_Data,
+	 *  GTRDYB/DVI_Clk): Bit 31 (DPLL VCO Enable) and Bit 30 (2X Clock
+	 *  Enable) must be set to “1” in both the DPLL A Control Register
+	 *  (06014h-06017h) and DPLL B Control Register (06018h-0601Bh)."
+	 *
+	 * For simplicity We simply keep both bits always enabled in
+	 * both DPLLS. The spec says we should disable the DVO 2X clock
+	 * when not needed, but this seems to work fine in practice.
+	 */
+	if (IS_I830(dev_priv) ||
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO))
+		dpll |= DPLL_DVO_2X_MODE;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
+	    intel_panel_use_ssc(dev_priv))
+		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
+	else
+		dpll |= PLL_REF_INPUT_DREFCLK;
+
+	dpll |= DPLL_VCO_ENABLE;
+	crtc_state->dpll_hw_state.dpll = dpll;
+}
+
+static int hsw_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+	int ret;
+
+	if (DISPLAY_VER(dev_priv) < 11 &&
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		return 0;
+
+	ret = intel_compute_shared_dplls(state, crtc, encoder);
+	if (ret)
+		return ret;
+
+	/* FIXME this is a mess */
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		return 0;
+
+	/* CRT dotclock is determined via other means */
+	if (!crtc_state->has_pch_encoder)
+		crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int hsw_crtc_get_shared_dpll(struct intel_atomic_state *state,
+				    struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+
+	if (DISPLAY_VER(dev_priv) < 11 &&
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		return 0;
+
+	return intel_reserve_shared_dplls(state, crtc, encoder);
+}
+
+static int dg2_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+	int ret;
+
+	ret = intel_mpllb_calc_state(crtc_state, encoder);
+	if (ret)
+		return ret;
+
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int mtl_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	int ret;
+
+	ret = intel_cx0pll_calc_state(crtc_state, encoder);
+	if (ret)
+		return ret;
+
+	/* TODO: Do the readback via intel_compute_shared_dplls() */
+	if (intel_is_c10phy(i915, phy))
+		crtc_state->port_clock = intel_c10pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10);
+	else
+		crtc_state->port_clock = intel_c20pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c20);
+
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static bool ilk_needs_fb_cb_tune(const struct dpll *dpll, int factor)
+{
+	return dpll->m < factor * dpll->n;
+}
+
+static void ilk_update_pll_dividers(struct intel_crtc_state *crtc_state,
+				    const struct dpll *clock,
+				    const struct dpll *reduced_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 fp, fp2;
+	int factor;
+
+	/* Enable autotuning of the PLL clock (if permissible) */
+	factor = 21;
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if ((intel_panel_use_ssc(dev_priv) &&
+		     dev_priv->display.vbt.lvds_ssc_freq == 100000) ||
+		    (HAS_PCH_IBX(dev_priv) &&
+		     intel_is_dual_link_lvds(dev_priv)))
+			factor = 25;
+	} else if (crtc_state->sdvo_tv_clock) {
+		factor = 20;
+	}
+
+	fp = i9xx_dpll_compute_fp(clock);
+	if (ilk_needs_fb_cb_tune(clock, factor))
+		fp |= FP_CB_TUNE;
+
+	fp2 = i9xx_dpll_compute_fp(reduced_clock);
+	if (ilk_needs_fb_cb_tune(reduced_clock, factor))
+		fp2 |= FP_CB_TUNE;
+
+	crtc_state->dpll_hw_state.fp0 = fp;
+	crtc_state->dpll_hw_state.fp1 = fp2;
+}
+
+static void ilk_compute_dpll(struct intel_crtc_state *crtc_state,
+			     const struct dpll *clock,
+			     const struct dpll *reduced_clock)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 dpll;
+
+	ilk_update_pll_dividers(crtc_state, clock, reduced_clock);
+
+	dpll = 0;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS))
+		dpll |= DPLLB_MODE_LVDS;
+	else
+		dpll |= DPLLB_MODE_DAC_SERIAL;
+
+	dpll |= (crtc_state->pixel_multiplier - 1)
+		<< PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO) ||
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
+		dpll |= DPLL_SDVO_HIGH_SPEED;
+
+	if (intel_crtc_has_dp_encoder(crtc_state))
+		dpll |= DPLL_SDVO_HIGH_SPEED;
+
+	/*
+	 * The high speed IO clock is only really required for
+	 * SDVO/HDMI/DP, but we also enable it for CRT to make it
+	 * possible to share the DPLL between CRT and HDMI. Enabling
+	 * the clock needlessly does no real harm, except use up a
+	 * bit of power potentially.
+	 *
+	 * We'll limit this to IVB with 3 pipes, since it has only two
+	 * DPLLs and so DPLL sharing is the only way to get three pipes
+	 * driving PCH ports at the same time. On SNB we could do this,
+	 * and potentially avoid enabling the second DPLL, but it's not
+	 * clear if it''s a win or loss power wise. No point in doing
+	 * this on ILK at all since it has a fixed DPLL<->pipe mapping.
+	 */
+	if (INTEL_NUM_PIPES(dev_priv) == 3 &&
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG))
+		dpll |= DPLL_SDVO_HIGH_SPEED;
+
+	/* compute bitmask from p1 value */
+	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
+	/* also FPA1 */
+	dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
+
+	switch (clock->p2) {
+	case 5:
+		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
+		break;
+	case 7:
+		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
+		break;
+	case 10:
+		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
+		break;
+	case 14:
+		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
+		break;
+	}
+	WARN_ON(reduced_clock->p2 != clock->p2);
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS) &&
+	    intel_panel_use_ssc(dev_priv))
+		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
+	else
+		dpll |= PLL_REF_INPUT_DREFCLK;
+
+	dpll |= DPLL_VCO_ENABLE;
+
+	crtc_state->dpll_hw_state.dpll = dpll;
+}
+
+static int ilk_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit;
+	int refclk = 120000;
+	int ret;
+
+	/* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
+	if (!crtc_state->has_pch_encoder)
+		return 0;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if (intel_panel_use_ssc(dev_priv)) {
+			drm_dbg_kms(&dev_priv->drm,
+				    "using SSC reference clock of %d kHz\n",
+				    dev_priv->display.vbt.lvds_ssc_freq);
+			refclk = dev_priv->display.vbt.lvds_ssc_freq;
+		}
+
+		if (intel_is_dual_link_lvds(dev_priv)) {
+			if (refclk == 100000)
+				limit = &ilk_limits_dual_lvds_100m;
+			else
+				limit = &ilk_limits_dual_lvds;
+		} else {
+			if (refclk == 100000)
+				limit = &ilk_limits_single_lvds_100m;
+			else
+				limit = &ilk_limits_single_lvds;
+		}
+	} else {
+		limit = &ilk_limits_dac;
+	}
+
+	if (!crtc_state->clock_set &&
+	    !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	ilk_compute_dpll(crtc_state, &crtc_state->dpll,
+			 &crtc_state->dpll);
+
+	ret = intel_compute_shared_dplls(state, crtc, NULL);
+	if (ret)
+		return ret;
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return ret;
+}
+
+static int ilk_crtc_get_shared_dpll(struct intel_atomic_state *state,
+				    struct intel_crtc *crtc)
+{
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+
+	/* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
+	if (!crtc_state->has_pch_encoder)
+		return 0;
+
+	return intel_reserve_shared_dplls(state, crtc, NULL);
+}
+
+void vlv_compute_dpll(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	crtc_state->dpll_hw_state.dpll = DPLL_INTEGRATED_REF_CLK_VLV |
+		DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
+	if (crtc->pipe != PIPE_A)
+		crtc_state->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;
+
+	/* DPLL not used with DSI, but still need the rest set up */
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		crtc_state->dpll_hw_state.dpll |= DPLL_VCO_ENABLE |
+			DPLL_EXT_BUFFER_ENABLE_VLV;
+
+	crtc_state->dpll_hw_state.dpll_md =
+		(crtc_state->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
+}
+
+void chv_compute_dpll(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	crtc_state->dpll_hw_state.dpll = DPLL_SSC_REF_CLK_CHV |
+		DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
+	if (crtc->pipe != PIPE_A)
+		crtc_state->dpll_hw_state.dpll |= DPLL_INTEGRATED_CRI_CLK_VLV;
+
+	/* DPLL not used with DSI, but still need the rest set up */
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		crtc_state->dpll_hw_state.dpll |= DPLL_VCO_ENABLE;
+
+	crtc_state->dpll_hw_state.dpll_md =
+		(crtc_state->pixel_multiplier - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
+}
+
+static int chv_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit = &intel_limits_chv;
+	int refclk = 100000;
+
+	if (!crtc_state->clock_set &&
+	    !chv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	chv_compute_dpll(crtc_state);
+
+	/* FIXME this is a mess */
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		return 0;
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int vlv_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit = &intel_limits_vlv;
+	int refclk = 100000;
+
+	if (!crtc_state->clock_set &&
+	    !vlv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				refclk, NULL, &crtc_state->dpll)) {
+		return -EINVAL;
+	}
+
+	vlv_compute_dpll(crtc_state);
+
+	/* FIXME this is a mess */
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
+		return 0;
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int g4x_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit;
+	int refclk = 96000;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if (intel_panel_use_ssc(dev_priv)) {
+			refclk = dev_priv->display.vbt.lvds_ssc_freq;
+			drm_dbg_kms(&dev_priv->drm,
+				    "using SSC reference clock of %d kHz\n",
+				    refclk);
+		}
+
+		if (intel_is_dual_link_lvds(dev_priv))
+			limit = &intel_limits_g4x_dual_channel_lvds;
+		else
+			limit = &intel_limits_g4x_single_channel_lvds;
+	} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) ||
+		   intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG)) {
+		limit = &intel_limits_g4x_hdmi;
+	} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO)) {
+		limit = &intel_limits_g4x_sdvo;
+	} else {
+		/* The option is for other outputs */
+		limit = &intel_limits_i9xx_sdvo;
+	}
+
+	if (!crtc_state->clock_set &&
+	    !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
+			  &crtc_state->dpll);
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	/* FIXME this is a mess */
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_TVOUT))
+		crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int pnv_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit;
+	int refclk = 96000;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if (intel_panel_use_ssc(dev_priv)) {
+			refclk = dev_priv->display.vbt.lvds_ssc_freq;
+			drm_dbg_kms(&dev_priv->drm,
+				    "using SSC reference clock of %d kHz\n",
+				    refclk);
+		}
+
+		limit = &pnv_limits_lvds;
+	} else {
+		limit = &pnv_limits_sdvo;
+	}
+
+	if (!crtc_state->clock_set &&
+	    !pnv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
+			  &crtc_state->dpll);
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int i9xx_crtc_compute_clock(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit;
+	int refclk = 96000;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if (intel_panel_use_ssc(dev_priv)) {
+			refclk = dev_priv->display.vbt.lvds_ssc_freq;
+			drm_dbg_kms(&dev_priv->drm,
+				    "using SSC reference clock of %d kHz\n",
+				    refclk);
+		}
+
+		limit = &intel_limits_i9xx_lvds;
+	} else {
+		limit = &intel_limits_i9xx_sdvo;
+	}
+
+	if (!crtc_state->clock_set &&
+	    !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				 refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
+			  &crtc_state->dpll);
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	/* FIXME this is a mess */
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_TVOUT))
+		crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static int i8xx_crtc_compute_clock(struct intel_atomic_state *state,
+				   struct intel_crtc *crtc)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_limit *limit;
+	int refclk = 48000;
+
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+		if (intel_panel_use_ssc(dev_priv)) {
+			refclk = dev_priv->display.vbt.lvds_ssc_freq;
+			drm_dbg_kms(&dev_priv->drm,
+				    "using SSC reference clock of %d kHz\n",
+				    refclk);
+		}
+
+		limit = &intel_limits_i8xx_lvds;
+	} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DVO)) {
+		limit = &intel_limits_i8xx_dvo;
+	} else {
+		limit = &intel_limits_i8xx_dac;
+	}
+
+	if (!crtc_state->clock_set &&
+	    !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+				 refclk, NULL, &crtc_state->dpll))
+		return -EINVAL;
+
+	i8xx_compute_dpll(crtc_state, &crtc_state->dpll,
+			  &crtc_state->dpll);
+
+	crtc_state->port_clock = crtc_state->dpll.dot;
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
+static const struct intel_dpll_funcs mtl_dpll_funcs = {
+	.crtc_compute_clock = mtl_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs dg2_dpll_funcs = {
+	.crtc_compute_clock = dg2_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs hsw_dpll_funcs = {
+	.crtc_compute_clock = hsw_crtc_compute_clock,
+	.crtc_get_shared_dpll = hsw_crtc_get_shared_dpll,
+};
+
+static const struct intel_dpll_funcs ilk_dpll_funcs = {
+	.crtc_compute_clock = ilk_crtc_compute_clock,
+	.crtc_get_shared_dpll = ilk_crtc_get_shared_dpll,
+};
+
+static const struct intel_dpll_funcs chv_dpll_funcs = {
+	.crtc_compute_clock = chv_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs vlv_dpll_funcs = {
+	.crtc_compute_clock = vlv_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs g4x_dpll_funcs = {
+	.crtc_compute_clock = g4x_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs pnv_dpll_funcs = {
+	.crtc_compute_clock = pnv_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs i9xx_dpll_funcs = {
+	.crtc_compute_clock = i9xx_crtc_compute_clock,
+};
+
+static const struct intel_dpll_funcs i8xx_dpll_funcs = {
+	.crtc_compute_clock = i8xx_crtc_compute_clock,
+};
+
+int intel_dpll_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	int ret;
+
+	drm_WARN_ON(&i915->drm, !intel_crtc_needs_modeset(crtc_state));
+
+	memset(&crtc_state->dpll_hw_state, 0,
+	       sizeof(crtc_state->dpll_hw_state));
+
+	if (!crtc_state->hw.enable)
+		return 0;
+
+	ret = i915->display.funcs.dpll->crtc_compute_clock(state, crtc);
+	if (ret) {
+		drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] Couldn't calculate DPLL settings\n",
+			    crtc->base.base.id, crtc->base.name);
+		return ret;
+	}
+
+	return 0;
+}
+
+int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
+				    struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	int ret;
+
+	drm_WARN_ON(&i915->drm, !intel_crtc_needs_modeset(crtc_state));
+	drm_WARN_ON(&i915->drm, !crtc_state->hw.enable && crtc_state->shared_dpll);
+
+	if (!crtc_state->hw.enable || crtc_state->shared_dpll)
+		return 0;
+
+	if (!i915->display.funcs.dpll->crtc_get_shared_dpll)
+		return 0;
+
+	ret = i915->display.funcs.dpll->crtc_get_shared_dpll(state, crtc);
+	if (ret) {
+		drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] Couldn't get a shared DPLL\n",
+			    crtc->base.base.id, crtc->base.name);
+		return ret;
+	}
+
+	return 0;
+}
+
+void
+intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv)
+{
+	if (DISPLAY_VER(dev_priv) >= 14)
+		dev_priv->display.funcs.dpll = &mtl_dpll_funcs;
+	else if (IS_DG2(dev_priv))
+		dev_priv->display.funcs.dpll = &dg2_dpll_funcs;
+	else if (DISPLAY_VER(dev_priv) >= 9 || HAS_DDI(dev_priv))
+		dev_priv->display.funcs.dpll = &hsw_dpll_funcs;
+	else if (HAS_PCH_SPLIT(dev_priv))
+		dev_priv->display.funcs.dpll = &ilk_dpll_funcs;
+	else if (IS_CHERRYVIEW(dev_priv))
+		dev_priv->display.funcs.dpll = &chv_dpll_funcs;
+	else if (IS_VALLEYVIEW(dev_priv))
+		dev_priv->display.funcs.dpll = &vlv_dpll_funcs;
+	else if (IS_G4X(dev_priv))
+		dev_priv->display.funcs.dpll = &g4x_dpll_funcs;
+	else if (IS_PINEVIEW(dev_priv))
+		dev_priv->display.funcs.dpll = &pnv_dpll_funcs;
+	else if (DISPLAY_VER(dev_priv) != 2)
+		dev_priv->display.funcs.dpll = &i9xx_dpll_funcs;
+	else
+		dev_priv->display.funcs.dpll = &i8xx_dpll_funcs;
+}
+
+static bool i9xx_has_pps(struct drm_i915_private *dev_priv)
+{
+	if (IS_I830(dev_priv))
+		return false;
+
+	return IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv);
+}
+
+void i9xx_enable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	u32 dpll = crtc_state->dpll_hw_state.dpll;
+	enum pipe pipe = crtc->pipe;
+	int i;
+
+	assert_transcoder_disabled(dev_priv, crtc_state->cpu_transcoder);
+
+	/* PLL is protected by panel, make sure we can write it */
+	if (i9xx_has_pps(dev_priv))
+		assert_pps_unlocked(dev_priv, pipe);
+
+	intel_de_write(dev_priv, FP0(pipe), crtc_state->dpll_hw_state.fp0);
+	intel_de_write(dev_priv, FP1(pipe), crtc_state->dpll_hw_state.fp1);
+
+	/*
+	 * Apparently we need to have VGA mode enabled prior to changing
+	 * the P1/P2 dividers. Otherwise the DPLL will keep using the old
+	 * dividers, even though the register value does change.
+	 */
+	intel_de_write(dev_priv, DPLL(pipe), dpll & ~DPLL_VGA_MODE_DIS);
+	intel_de_write(dev_priv, DPLL(pipe), dpll);
+
+	/* Wait for the clocks to stabilize. */
+	intel_de_posting_read(dev_priv, DPLL(pipe));
+	udelay(150);
+
+	if (DISPLAY_VER(dev_priv) >= 4) {
+		intel_de_write(dev_priv, DPLL_MD(pipe),
+			       crtc_state->dpll_hw_state.dpll_md);
+	} else {
+		/* The pixel multiplier can only be updated once the
+		 * DPLL is enabled and the clocks are stable.
+		 *
+		 * So write it again.
+		 */
+		intel_de_write(dev_priv, DPLL(pipe), dpll);
+	}
+
+	/* We do this three times for luck */
+	for (i = 0; i < 3; i++) {
+		intel_de_write(dev_priv, DPLL(pipe), dpll);
+		intel_de_posting_read(dev_priv, DPLL(pipe));
+		udelay(150); /* wait for warmup */
+	}
+}
+
+static void vlv_pllb_recal_opamp(struct drm_i915_private *dev_priv,
+				 enum pipe pipe)
+{
+	u32 reg_val;
+
+	/*
+	 * PLLB opamp always calibrates to max value of 0x3f, force enable it
+	 * and set it to a reasonable value instead.
+	 */
+	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
+	reg_val &= 0xffffff00;
+	reg_val |= 0x00000030;
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);
+
+	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
+	reg_val &= 0x00ffffff;
+	reg_val |= 0x8c000000;
+	vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
+
+	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW9(1));
+	reg_val &= 0xffffff00;
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9(1), reg_val);
+
+	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_REF_DW13);
+	reg_val &= 0x00ffffff;
+	reg_val |= 0xb0000000;
+	vlv_dpio_write(dev_priv, pipe, VLV_REF_DW13, reg_val);
+}
+
+static void vlv_prepare_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	u32 mdiv;
+	u32 bestn, bestm1, bestm2, bestp1, bestp2;
+	u32 coreclk, reg_val;
+
+	vlv_dpio_get(dev_priv);
+
+	bestn = crtc_state->dpll.n;
+	bestm1 = crtc_state->dpll.m1;
+	bestm2 = crtc_state->dpll.m2;
+	bestp1 = crtc_state->dpll.p1;
+	bestp2 = crtc_state->dpll.p2;
+
+	/* See eDP HDMI DPIO driver vbios notes doc */
+
+	/* PLL B needs special handling */
+	if (pipe == PIPE_B)
+		vlv_pllb_recal_opamp(dev_priv, pipe);
+
+	/* Set up Tx target for periodic Rcomp update */
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW9_BCAST, 0x0100000f);
+
+	/* Disable target IRef on PLL */
+	reg_val = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW8(pipe));
+	reg_val &= 0x00ffffff;
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW8(pipe), reg_val);
+
+	/* Disable fast lock */
+	vlv_dpio_write(dev_priv, pipe, VLV_CMN_DW0, 0x610);
+
+	/* Set idtafcrecal before PLL is enabled */
+	mdiv = ((bestm1 << DPIO_M1DIV_SHIFT) | (bestm2 & DPIO_M2DIV_MASK));
+	mdiv |= ((bestp1 << DPIO_P1_SHIFT) | (bestp2 << DPIO_P2_SHIFT));
+	mdiv |= ((bestn << DPIO_N_SHIFT));
+	mdiv |= (1 << DPIO_K_SHIFT);
+
+	/*
+	 * Post divider depends on pixel clock rate, DAC vs digital (and LVDS,
+	 * but we don't support that).
+	 * Note: don't use the DAC post divider as it seems unstable.
+	 */
+	mdiv |= (DPIO_POST_DIV_HDMIDP << DPIO_POST_DIV_SHIFT);
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);
+
+	mdiv |= DPIO_ENABLE_CALIBRATION;
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW3(pipe), mdiv);
+
+	/* Set HBR and RBR LPF coefficients */
+	if (crtc_state->port_clock == 162000 ||
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_ANALOG) ||
+	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
+		vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
+				 0x009f0003);
+	else
+		vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW10(pipe),
+				 0x00d0000f);
+
+	if (intel_crtc_has_dp_encoder(crtc_state)) {
+		/* Use SSC source */
+		if (pipe == PIPE_A)
+			vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
+					 0x0df40000);
+		else
+			vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
+					 0x0df70000);
+	} else { /* HDMI or VGA */
+		/* Use bend source */
+		if (pipe == PIPE_A)
+			vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
+					 0x0df70000);
+		else
+			vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW5(pipe),
+					 0x0df40000);
+	}
+
+	coreclk = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW7(pipe));
+	coreclk = (coreclk & 0x0000ff00) | 0x01c00000;
+	if (intel_crtc_has_dp_encoder(crtc_state))
+		coreclk |= 0x01000000;
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW7(pipe), coreclk);
+
+	vlv_dpio_write(dev_priv, pipe, VLV_PLL_DW11(pipe), 0x87871000);
+
+	vlv_dpio_put(dev_priv);
+}
+
+static void _vlv_enable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	intel_de_write(dev_priv, DPLL(pipe), crtc_state->dpll_hw_state.dpll);
+	intel_de_posting_read(dev_priv, DPLL(pipe));
+	udelay(150);
+
+	if (intel_de_wait_for_set(dev_priv, DPLL(pipe), DPLL_LOCK_VLV, 1))
+		drm_err(&dev_priv->drm, "DPLL %d failed to lock\n", pipe);
+}
+
+void vlv_enable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	assert_transcoder_disabled(dev_priv, crtc_state->cpu_transcoder);
+
+	/* PLL is protected by panel, make sure we can write it */
+	assert_pps_unlocked(dev_priv, pipe);
+
+	/* Enable Refclk */
+	intel_de_write(dev_priv, DPLL(pipe),
+		       crtc_state->dpll_hw_state.dpll &
+		       ~(DPLL_VCO_ENABLE | DPLL_EXT_BUFFER_ENABLE_VLV));
+
+	if (crtc_state->dpll_hw_state.dpll & DPLL_VCO_ENABLE) {
+		vlv_prepare_pll(crtc_state);
+		_vlv_enable_pll(crtc_state);
+	}
+
+	intel_de_write(dev_priv, DPLL_MD(pipe),
+		       crtc_state->dpll_hw_state.dpll_md);
+	intel_de_posting_read(dev_priv, DPLL_MD(pipe));
+}
+
+static void chv_prepare_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	enum dpio_channel port = vlv_pipe_to_channel(pipe);
+	u32 loopfilter, tribuf_calcntr;
+	u32 bestm2, bestp1, bestp2, bestm2_frac;
+	u32 dpio_val;
+	int vco;
+
+	bestm2_frac = crtc_state->dpll.m2 & 0x3fffff;
+	bestm2 = crtc_state->dpll.m2 >> 22;
+	bestp1 = crtc_state->dpll.p1;
+	bestp2 = crtc_state->dpll.p2;
+	vco = crtc_state->dpll.vco;
+	dpio_val = 0;
+	loopfilter = 0;
+
+	vlv_dpio_get(dev_priv);
+
+	/* p1 and p2 divider */
+	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW13(port),
+			5 << DPIO_CHV_S1_DIV_SHIFT |
+			bestp1 << DPIO_CHV_P1_DIV_SHIFT |
+			bestp2 << DPIO_CHV_P2_DIV_SHIFT |
+			1 << DPIO_CHV_K_DIV_SHIFT);
+
+	/* Feedback post-divider - m2 */
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW0(port), bestm2);
+
+	/* Feedback refclk divider - n and m1 */
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW1(port),
+			DPIO_CHV_M1_DIV_BY_2 |
+			1 << DPIO_CHV_N_DIV_SHIFT);
+
+	/* M2 fraction division */
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW2(port), bestm2_frac);
+
+	/* M2 fraction division enable */
+	dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
+	dpio_val &= ~(DPIO_CHV_FEEDFWD_GAIN_MASK | DPIO_CHV_FRAC_DIV_EN);
+	dpio_val |= (2 << DPIO_CHV_FEEDFWD_GAIN_SHIFT);
+	if (bestm2_frac)
+		dpio_val |= DPIO_CHV_FRAC_DIV_EN;
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW3(port), dpio_val);
+
+	/* Program digital lock detect threshold */
+	dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW9(port));
+	dpio_val &= ~(DPIO_CHV_INT_LOCK_THRESHOLD_MASK |
+					DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE);
+	dpio_val |= (0x5 << DPIO_CHV_INT_LOCK_THRESHOLD_SHIFT);
+	if (!bestm2_frac)
+		dpio_val |= DPIO_CHV_INT_LOCK_THRESHOLD_SEL_COARSE;
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW9(port), dpio_val);
+
+	/* Loop filter */
+	if (vco == 5400000) {
+		loopfilter |= (0x3 << DPIO_CHV_PROP_COEFF_SHIFT);
+		loopfilter |= (0x8 << DPIO_CHV_INT_COEFF_SHIFT);
+		loopfilter |= (0x1 << DPIO_CHV_GAIN_CTRL_SHIFT);
+		tribuf_calcntr = 0x9;
+	} else if (vco <= 6200000) {
+		loopfilter |= (0x5 << DPIO_CHV_PROP_COEFF_SHIFT);
+		loopfilter |= (0xB << DPIO_CHV_INT_COEFF_SHIFT);
+		loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
+		tribuf_calcntr = 0x9;
+	} else if (vco <= 6480000) {
+		loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
+		loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
+		loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
+		tribuf_calcntr = 0x8;
+	} else {
+		/* Not supported. Apply the same limits as in the max case */
+		loopfilter |= (0x4 << DPIO_CHV_PROP_COEFF_SHIFT);
+		loopfilter |= (0x9 << DPIO_CHV_INT_COEFF_SHIFT);
+		loopfilter |= (0x3 << DPIO_CHV_GAIN_CTRL_SHIFT);
+		tribuf_calcntr = 0;
+	}
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW6(port), loopfilter);
+
+	dpio_val = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW8(port));
+	dpio_val &= ~DPIO_CHV_TDC_TARGET_CNT_MASK;
+	dpio_val |= (tribuf_calcntr << DPIO_CHV_TDC_TARGET_CNT_SHIFT);
+	vlv_dpio_write(dev_priv, pipe, CHV_PLL_DW8(port), dpio_val);
+
+	/* AFC Recal */
+	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port),
+			vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port)) |
+			DPIO_AFC_RECAL);
+
+	vlv_dpio_put(dev_priv);
+}
+
+static void _chv_enable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	enum dpio_channel port = vlv_pipe_to_channel(pipe);
+	u32 tmp;
+
+	vlv_dpio_get(dev_priv);
+
+	/* Enable back the 10bit clock to display controller */
+	tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
+	tmp |= DPIO_DCLKP_EN;
+	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), tmp);
+
+	vlv_dpio_put(dev_priv);
+
+	/*
+	 * Need to wait > 100ns between dclkp clock enable bit and PLL enable.
+	 */
+	udelay(1);
+
+	/* Enable PLL */
+	intel_de_write(dev_priv, DPLL(pipe), crtc_state->dpll_hw_state.dpll);
+
+	/* Check PLL is locked */
+	if (intel_de_wait_for_set(dev_priv, DPLL(pipe), DPLL_LOCK_VLV, 1))
+		drm_err(&dev_priv->drm, "PLL %d failed to lock\n", pipe);
+}
+
+void chv_enable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	assert_transcoder_disabled(dev_priv, crtc_state->cpu_transcoder);
+
+	/* PLL is protected by panel, make sure we can write it */
+	assert_pps_unlocked(dev_priv, pipe);
+
+	/* Enable Refclk and SSC */
+	intel_de_write(dev_priv, DPLL(pipe),
+		       crtc_state->dpll_hw_state.dpll & ~DPLL_VCO_ENABLE);
+
+	if (crtc_state->dpll_hw_state.dpll & DPLL_VCO_ENABLE) {
+		chv_prepare_pll(crtc_state);
+		_chv_enable_pll(crtc_state);
+	}
+
+	if (pipe != PIPE_A) {
+		/*
+		 * WaPixelRepeatModeFixForC0:chv
+		 *
+		 * DPLLCMD is AWOL. Use chicken bits to propagate
+		 * the value from DPLLBMD to either pipe B or C.
+		 */
+		intel_de_write(dev_priv, CBR4_VLV, CBR_DPLLBMD_PIPE(pipe));
+		intel_de_write(dev_priv, DPLL_MD(PIPE_B),
+			       crtc_state->dpll_hw_state.dpll_md);
+		intel_de_write(dev_priv, CBR4_VLV, 0);
+		dev_priv->display.state.chv_dpll_md[pipe] = crtc_state->dpll_hw_state.dpll_md;
+
+		/*
+		 * DPLLB VGA mode also seems to cause problems.
+		 * We should always have it disabled.
+		 */
+		drm_WARN_ON(&dev_priv->drm,
+			    (intel_de_read(dev_priv, DPLL(PIPE_B)) &
+			     DPLL_VGA_MODE_DIS) == 0);
+	} else {
+		intel_de_write(dev_priv, DPLL_MD(pipe),
+			       crtc_state->dpll_hw_state.dpll_md);
+		intel_de_posting_read(dev_priv, DPLL_MD(pipe));
+	}
+}
+
+/**
+ * vlv_force_pll_on - forcibly enable just the PLL
+ * @dev_priv: i915 private structure
+ * @pipe: pipe PLL to enable
+ * @dpll: PLL configuration
+ *
+ * Enable the PLL for @pipe using the supplied @dpll config. To be used
+ * in cases where we need the PLL enabled even when @pipe is not going to
+ * be enabled.
+ */
+int vlv_force_pll_on(struct drm_i915_private *dev_priv, enum pipe pipe,
+		     const struct dpll *dpll)
+{
+	struct intel_crtc *crtc = intel_crtc_for_pipe(dev_priv, pipe);
+	struct intel_crtc_state *crtc_state;
+
+	crtc_state = intel_crtc_state_alloc(crtc);
+	if (!crtc_state)
+		return -ENOMEM;
+
+	crtc_state->cpu_transcoder = (enum transcoder)pipe;
+	crtc_state->pixel_multiplier = 1;
+	crtc_state->dpll = *dpll;
+	crtc_state->output_types = BIT(INTEL_OUTPUT_EDP);
+
+	if (IS_CHERRYVIEW(dev_priv)) {
+		chv_compute_dpll(crtc_state);
+		chv_enable_pll(crtc_state);
+	} else {
+		vlv_compute_dpll(crtc_state);
+		vlv_enable_pll(crtc_state);
+	}
+
+	kfree(crtc_state);
+
+	return 0;
+}
+
+void vlv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
+{
+	u32 val;
+
+	/* Make sure the pipe isn't still relying on us */
+	assert_transcoder_disabled(dev_priv, (enum transcoder)pipe);
+
+	val = DPLL_INTEGRATED_REF_CLK_VLV |
+		DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
+	if (pipe != PIPE_A)
+		val |= DPLL_INTEGRATED_CRI_CLK_VLV;
+
+	intel_de_write(dev_priv, DPLL(pipe), val);
+	intel_de_posting_read(dev_priv, DPLL(pipe));
+}
+
+void chv_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
+{
+	enum dpio_channel port = vlv_pipe_to_channel(pipe);
+	u32 val;
+
+	/* Make sure the pipe isn't still relying on us */
+	assert_transcoder_disabled(dev_priv, (enum transcoder)pipe);
+
+	val = DPLL_SSC_REF_CLK_CHV |
+		DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
+	if (pipe != PIPE_A)
+		val |= DPLL_INTEGRATED_CRI_CLK_VLV;
+
+	intel_de_write(dev_priv, DPLL(pipe), val);
+	intel_de_posting_read(dev_priv, DPLL(pipe));
+
+	vlv_dpio_get(dev_priv);
+
+	/* Disable 10bit clock to display controller */
+	val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW14(port));
+	val &= ~DPIO_DCLKP_EN;
+	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW14(port), val);
+
+	vlv_dpio_put(dev_priv);
+}
+
+void i9xx_disable_pll(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	/* Don't disable pipe or pipe PLLs if needed */
+	if (IS_I830(dev_priv))
+		return;
+
+	/* Make sure the pipe isn't still relying on us */
+	assert_transcoder_disabled(dev_priv, crtc_state->cpu_transcoder);
+
+	intel_de_write(dev_priv, DPLL(pipe), DPLL_VGA_MODE_DIS);
+	intel_de_posting_read(dev_priv, DPLL(pipe));
+}
+
+
+/**
+ * vlv_force_pll_off - forcibly disable just the PLL
+ * @dev_priv: i915 private structure
+ * @pipe: pipe PLL to disable
+ *
+ * Disable the PLL for @pipe. To be used in cases where we need
+ * the PLL enabled even when @pipe is not going to be enabled.
+ */
+void vlv_force_pll_off(struct drm_i915_private *dev_priv, enum pipe pipe)
+{
+	if (IS_CHERRYVIEW(dev_priv))
+		chv_disable_pll(dev_priv, pipe);
+	else
+		vlv_disable_pll(dev_priv, pipe);
+}
+
+/* Only for pre-ILK configs */
+static void assert_pll(struct drm_i915_private *dev_priv,
+		       enum pipe pipe, bool state)
+{
+	bool cur_state;
+
+	cur_state = intel_de_read(dev_priv, DPLL(pipe)) & DPLL_VCO_ENABLE;
+	I915_STATE_WARN(dev_priv, cur_state != state,
+			"PLL state assertion failure (expected %s, current %s)\n",
+			str_on_off(state), str_on_off(cur_state));
+}
+
+void assert_pll_enabled(struct drm_i915_private *i915, enum pipe pipe)
+{
+	assert_pll(i915, pipe, true);
+}
+
+void assert_pll_disabled(struct drm_i915_private *i915, enum pipe pipe)
+{
+	assert_pll(i915, pipe, false);
+}