Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 1030 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
new file mode 100644
index 000000000..4bd576873
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -0,0 +1,1030 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * DOC: Panel Self Refresh (PSR/SRD)
+ *
+ * Since Haswell Display controller supports Panel Self-Refresh on display
+ * panels witch have a remote frame buffer (RFB) implemented according to PSR
+ * spec in eDP1.3. PSR feature allows the display to go to lower standby states
+ * when system is idle but display is on as it eliminates display refresh
+ * request to DDR memory completely as long as the frame buffer for that
+ * display is unchanged.
+ *
+ * Panel Self Refresh must be supported by both Hardware (source) and
+ * Panel (sink).
+ *
+ * PSR saves power by caching the framebuffer in the panel RFB, which allows us
+ * to power down the link and memory controller. For DSI panels the same idea
+ * is called "manual mode".
+ *
+ * The implementation uses the hardware-based PSR support which automatically
+ * enters/exits self-refresh mode. The hardware takes care of sending the
+ * required DP aux message and could even retrain the link (that part isn't
+ * enabled yet though). The hardware also keeps track of any frontbuffer
+ * changes to know when to exit self-refresh mode again. Unfortunately that
+ * part doesn't work too well, hence why the i915 PSR support uses the
+ * software frontbuffer tracking to make sure it doesn't miss a screen
+ * update. For this integration intel_psr_invalidate() and intel_psr_flush()
+ * get called by the frontbuffer tracking code. Note that because of locking
+ * issues the self-refresh re-enable code is done from a work queue, which
+ * must be correctly synchronized/cancelled when shutting down the pipe."
+ */
+
+#include <drm/drmP.h>
+
+#include "intel_drv.h"
+#include "i915_drv.h"
+
+void intel_psr_irq_control(struct drm_i915_private *dev_priv, bool debug)
+{
+	u32 debug_mask, mask;
+
+	mask = EDP_PSR_ERROR(TRANSCODER_EDP);
+	debug_mask = EDP_PSR_POST_EXIT(TRANSCODER_EDP) |
+		     EDP_PSR_PRE_ENTRY(TRANSCODER_EDP);
+
+	if (INTEL_GEN(dev_priv) >= 8) {
+		mask |= EDP_PSR_ERROR(TRANSCODER_A) |
+			EDP_PSR_ERROR(TRANSCODER_B) |
+			EDP_PSR_ERROR(TRANSCODER_C);
+
+		debug_mask |= EDP_PSR_POST_EXIT(TRANSCODER_A) |
+			      EDP_PSR_PRE_ENTRY(TRANSCODER_A) |
+			      EDP_PSR_POST_EXIT(TRANSCODER_B) |
+			      EDP_PSR_PRE_ENTRY(TRANSCODER_B) |
+			      EDP_PSR_POST_EXIT(TRANSCODER_C) |
+			      EDP_PSR_PRE_ENTRY(TRANSCODER_C);
+	}
+
+	if (debug)
+		mask |= debug_mask;
+
+	WRITE_ONCE(dev_priv->psr.debug, debug);
+	I915_WRITE(EDP_PSR_IMR, ~mask);
+}
+
+static void psr_event_print(u32 val, bool psr2_enabled)
+{
+	DRM_DEBUG_KMS("PSR exit events: 0x%x\n", val);
+	if (val & PSR_EVENT_PSR2_WD_TIMER_EXPIRE)
+		DRM_DEBUG_KMS("\tPSR2 watchdog timer expired\n");
+	if ((val & PSR_EVENT_PSR2_DISABLED) && psr2_enabled)
+		DRM_DEBUG_KMS("\tPSR2 disabled\n");
+	if (val & PSR_EVENT_SU_DIRTY_FIFO_UNDERRUN)
+		DRM_DEBUG_KMS("\tSU dirty FIFO underrun\n");
+	if (val & PSR_EVENT_SU_CRC_FIFO_UNDERRUN)
+		DRM_DEBUG_KMS("\tSU CRC FIFO underrun\n");
+	if (val & PSR_EVENT_GRAPHICS_RESET)
+		DRM_DEBUG_KMS("\tGraphics reset\n");
+	if (val & PSR_EVENT_PCH_INTERRUPT)
+		DRM_DEBUG_KMS("\tPCH interrupt\n");
+	if (val & PSR_EVENT_MEMORY_UP)
+		DRM_DEBUG_KMS("\tMemory up\n");
+	if (val & PSR_EVENT_FRONT_BUFFER_MODIFY)
+		DRM_DEBUG_KMS("\tFront buffer modification\n");
+	if (val & PSR_EVENT_WD_TIMER_EXPIRE)
+		DRM_DEBUG_KMS("\tPSR watchdog timer expired\n");
+	if (val & PSR_EVENT_PIPE_REGISTERS_UPDATE)
+		DRM_DEBUG_KMS("\tPIPE registers updated\n");
+	if (val & PSR_EVENT_REGISTER_UPDATE)
+		DRM_DEBUG_KMS("\tRegister updated\n");
+	if (val & PSR_EVENT_HDCP_ENABLE)
+		DRM_DEBUG_KMS("\tHDCP enabled\n");
+	if (val & PSR_EVENT_KVMR_SESSION_ENABLE)
+		DRM_DEBUG_KMS("\tKVMR session enabled\n");
+	if (val & PSR_EVENT_VBI_ENABLE)
+		DRM_DEBUG_KMS("\tVBI enabled\n");
+	if (val & PSR_EVENT_LPSP_MODE_EXIT)
+		DRM_DEBUG_KMS("\tLPSP mode exited\n");
+	if ((val & PSR_EVENT_PSR_DISABLE) && !psr2_enabled)
+		DRM_DEBUG_KMS("\tPSR disabled\n");
+}
+
+void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
+{
+	u32 transcoders = BIT(TRANSCODER_EDP);
+	enum transcoder cpu_transcoder;
+	ktime_t time_ns =  ktime_get();
+
+	if (INTEL_GEN(dev_priv) >= 8)
+		transcoders |= BIT(TRANSCODER_A) |
+			       BIT(TRANSCODER_B) |
+			       BIT(TRANSCODER_C);
+
+	for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
+		/* FIXME: Exit PSR and link train manually when this happens. */
+		if (psr_iir & EDP_PSR_ERROR(cpu_transcoder))
+			DRM_DEBUG_KMS("[transcoder %s] PSR aux error\n",
+				      transcoder_name(cpu_transcoder));
+
+		if (psr_iir & EDP_PSR_PRE_ENTRY(cpu_transcoder)) {
+			dev_priv->psr.last_entry_attempt = time_ns;
+			DRM_DEBUG_KMS("[transcoder %s] PSR entry attempt in 2 vblanks\n",
+				      transcoder_name(cpu_transcoder));
+		}
+
+		if (psr_iir & EDP_PSR_POST_EXIT(cpu_transcoder)) {
+			dev_priv->psr.last_exit = time_ns;
+			DRM_DEBUG_KMS("[transcoder %s] PSR exit completed\n",
+				      transcoder_name(cpu_transcoder));
+
+			if (INTEL_GEN(dev_priv) >= 9) {
+				u32 val = I915_READ(PSR_EVENT(cpu_transcoder));
+				bool psr2_enabled = dev_priv->psr.psr2_enabled;
+
+				I915_WRITE(PSR_EVENT(cpu_transcoder), val);
+				psr_event_print(val, psr2_enabled);
+			}
+		}
+	}
+}
+
+static bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp)
+{
+	uint8_t dprx = 0;
+
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_DPRX_FEATURE_ENUMERATION_LIST,
+			      &dprx) != 1)
+		return false;
+	return dprx & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED;
+}
+
+static bool intel_dp_get_alpm_status(struct intel_dp *intel_dp)
+{
+	uint8_t alpm_caps = 0;
+
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP,
+			      &alpm_caps) != 1)
+		return false;
+	return alpm_caps & DP_ALPM_CAP;
+}
+
+static u8 intel_dp_get_sink_sync_latency(struct intel_dp *intel_dp)
+{
+	u8 val = 8; /* assume the worst if we can't read the value */
+
+	if (drm_dp_dpcd_readb(&intel_dp->aux,
+			      DP_SYNCHRONIZATION_LATENCY_IN_SINK, &val) == 1)
+		val &= DP_MAX_RESYNC_FRAME_COUNT_MASK;
+	else
+		DRM_DEBUG_KMS("Unable to get sink synchronization latency, assuming 8 frames\n");
+	return val;
+}
+
+void intel_psr_init_dpcd(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *dev_priv =
+		to_i915(dp_to_dig_port(intel_dp)->base.base.dev);
+
+	drm_dp_dpcd_read(&intel_dp->aux, DP_PSR_SUPPORT, intel_dp->psr_dpcd,
+			 sizeof(intel_dp->psr_dpcd));
+
+	if (!intel_dp->psr_dpcd[0])
+		return;
+	DRM_DEBUG_KMS("eDP panel supports PSR version %x\n",
+		      intel_dp->psr_dpcd[0]);
+
+	if (!(intel_dp->edp_dpcd[1] & DP_EDP_SET_POWER_CAP)) {
+		DRM_DEBUG_KMS("Panel lacks power state control, PSR cannot be enabled\n");
+		return;
+	}
+	dev_priv->psr.sink_support = true;
+	dev_priv->psr.sink_sync_latency =
+		intel_dp_get_sink_sync_latency(intel_dp);
+
+	if (INTEL_GEN(dev_priv) >= 9 &&
+	    (intel_dp->psr_dpcd[0] == DP_PSR2_WITH_Y_COORD_IS_SUPPORTED)) {
+		bool y_req = intel_dp->psr_dpcd[1] &
+			     DP_PSR2_SU_Y_COORDINATE_REQUIRED;
+		bool alpm = intel_dp_get_alpm_status(intel_dp);
+
+		/*
+		 * All panels that supports PSR version 03h (PSR2 +
+		 * Y-coordinate) can handle Y-coordinates in VSC but we are
+		 * only sure that it is going to be used when required by the
+		 * panel. This way panel is capable to do selective update
+		 * without a aux frame sync.
+		 *
+		 * To support PSR version 02h and PSR version 03h without
+		 * Y-coordinate requirement panels we would need to enable
+		 * GTC first.
+		 */
+		dev_priv->psr.sink_psr2_support = y_req && alpm;
+		DRM_DEBUG_KMS("PSR2 %ssupported\n",
+			      dev_priv->psr.sink_psr2_support ? "" : "not ");
+
+		if (dev_priv->psr.sink_psr2_support) {
+			dev_priv->psr.colorimetry_support =
+				intel_dp_get_colorimetry_status(intel_dp);
+		}
+	}
+}
+
+static void intel_psr_setup_vsc(struct intel_dp *intel_dp,
+				const struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
+	struct edp_vsc_psr psr_vsc;
+
+	if (dev_priv->psr.psr2_enabled) {
+		/* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
+		memset(&psr_vsc, 0, sizeof(psr_vsc));
+		psr_vsc.sdp_header.HB0 = 0;
+		psr_vsc.sdp_header.HB1 = 0x7;
+		if (dev_priv->psr.colorimetry_support) {
+			psr_vsc.sdp_header.HB2 = 0x5;
+			psr_vsc.sdp_header.HB3 = 0x13;
+		} else {
+			psr_vsc.sdp_header.HB2 = 0x4;
+			psr_vsc.sdp_header.HB3 = 0xe;
+		}
+	} else {
+		/* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
+		memset(&psr_vsc, 0, sizeof(psr_vsc));
+		psr_vsc.sdp_header.HB0 = 0;
+		psr_vsc.sdp_header.HB1 = 0x7;
+		psr_vsc.sdp_header.HB2 = 0x2;
+		psr_vsc.sdp_header.HB3 = 0x8;
+	}
+
+	intel_dig_port->write_infoframe(&intel_dig_port->base.base, crtc_state,
+					DP_SDP_VSC, &psr_vsc, sizeof(psr_vsc));
+}
+
+static void hsw_psr_setup_aux(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	u32 aux_clock_divider, aux_ctl;
+	int i;
+	static const uint8_t aux_msg[] = {
+		[0] = DP_AUX_NATIVE_WRITE << 4,
+		[1] = DP_SET_POWER >> 8,
+		[2] = DP_SET_POWER & 0xff,
+		[3] = 1 - 1,
+		[4] = DP_SET_POWER_D0,
+	};
+	u32 psr_aux_mask = EDP_PSR_AUX_CTL_TIME_OUT_MASK |
+			   EDP_PSR_AUX_CTL_MESSAGE_SIZE_MASK |
+			   EDP_PSR_AUX_CTL_PRECHARGE_2US_MASK |
+			   EDP_PSR_AUX_CTL_BIT_CLOCK_2X_MASK;
+
+	BUILD_BUG_ON(sizeof(aux_msg) > 20);
+	for (i = 0; i < sizeof(aux_msg); i += 4)
+		I915_WRITE(EDP_PSR_AUX_DATA(i >> 2),
+			   intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
+
+	aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
+
+	/* Start with bits set for DDI_AUX_CTL register */
+	aux_ctl = intel_dp->get_aux_send_ctl(intel_dp, sizeof(aux_msg),
+					     aux_clock_divider);
+
+	/* Select only valid bits for SRD_AUX_CTL */
+	aux_ctl &= psr_aux_mask;
+	I915_WRITE(EDP_PSR_AUX_CTL, aux_ctl);
+}
+
+static void intel_psr_enable_sink(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	u8 dpcd_val = DP_PSR_ENABLE;
+
+	/* Enable ALPM at sink for psr2 */
+	if (dev_priv->psr.psr2_enabled) {
+		drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG,
+				   DP_ALPM_ENABLE);
+		dpcd_val |= DP_PSR_ENABLE_PSR2;
+	}
+
+	if (dev_priv->psr.link_standby)
+		dpcd_val |= DP_PSR_MAIN_LINK_ACTIVE;
+	if (!dev_priv->psr.psr2_enabled && INTEL_GEN(dev_priv) >= 8)
+		dpcd_val |= DP_PSR_CRC_VERIFICATION;
+	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
+
+	drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+}
+
+static void hsw_activate_psr1(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	u32 max_sleep_time = 0x1f;
+	u32 val = EDP_PSR_ENABLE;
+
+	/* Let's use 6 as the minimum to cover all known cases including the
+	 * off-by-one issue that HW has in some cases.
+	 */
+	int idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
+
+	/* sink_sync_latency of 8 means source has to wait for more than 8
+	 * frames, we'll go with 9 frames for now
+	 */
+	idle_frames = max(idle_frames, dev_priv->psr.sink_sync_latency + 1);
+	val |= idle_frames << EDP_PSR_IDLE_FRAME_SHIFT;
+
+	val |= max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT;
+	if (IS_HASWELL(dev_priv))
+		val |= EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
+
+	if (dev_priv->psr.link_standby)
+		val |= EDP_PSR_LINK_STANDBY;
+
+	if (dev_priv->vbt.psr.tp1_wakeup_time_us == 0)
+		val |=  EDP_PSR_TP1_TIME_0us;
+	else if (dev_priv->vbt.psr.tp1_wakeup_time_us <= 100)
+		val |= EDP_PSR_TP1_TIME_100us;
+	else if (dev_priv->vbt.psr.tp1_wakeup_time_us <= 500)
+		val |= EDP_PSR_TP1_TIME_500us;
+	else
+		val |= EDP_PSR_TP1_TIME_2500us;
+
+	if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us == 0)
+		val |=  EDP_PSR_TP2_TP3_TIME_0us;
+	else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 100)
+		val |= EDP_PSR_TP2_TP3_TIME_100us;
+	else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 500)
+		val |= EDP_PSR_TP2_TP3_TIME_500us;
+	else
+		val |= EDP_PSR_TP2_TP3_TIME_2500us;
+
+	if (intel_dp_source_supports_hbr2(intel_dp) &&
+	    drm_dp_tps3_supported(intel_dp->dpcd))
+		val |= EDP_PSR_TP1_TP3_SEL;
+	else
+		val |= EDP_PSR_TP1_TP2_SEL;
+
+	if (INTEL_GEN(dev_priv) >= 8)
+		val |= EDP_PSR_CRC_ENABLE;
+
+	val |= I915_READ(EDP_PSR_CTL) & EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK;
+	I915_WRITE(EDP_PSR_CTL, val);
+}
+
+static void hsw_activate_psr2(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	u32 val;
+
+	/* Let's use 6 as the minimum to cover all known cases including the
+	 * off-by-one issue that HW has in some cases.
+	 */
+	int idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
+
+	idle_frames = max(idle_frames, dev_priv->psr.sink_sync_latency + 1);
+	val = idle_frames << EDP_PSR2_IDLE_FRAME_SHIFT;
+
+	/* FIXME: selective update is probably totally broken because it doesn't
+	 * mesh at all with our frontbuffer tracking. And the hw alone isn't
+	 * good enough. */
+	val |= EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE;
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+		val |= EDP_Y_COORDINATE_ENABLE;
+
+	val |= EDP_PSR2_FRAME_BEFORE_SU(dev_priv->psr.sink_sync_latency + 1);
+
+	if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us >= 0 &&
+	    dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 50)
+		val |= EDP_PSR2_TP2_TIME_50us;
+	else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 100)
+		val |= EDP_PSR2_TP2_TIME_100us;
+	else if (dev_priv->vbt.psr.tp2_tp3_wakeup_time_us <= 500)
+		val |= EDP_PSR2_TP2_TIME_500us;
+	else
+		val |= EDP_PSR2_TP2_TIME_2500us;
+
+	I915_WRITE(EDP_PSR2_CTL, val);
+}
+
+static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
+				    struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	int crtc_hdisplay = crtc_state->base.adjusted_mode.crtc_hdisplay;
+	int crtc_vdisplay = crtc_state->base.adjusted_mode.crtc_vdisplay;
+	int psr_max_h = 0, psr_max_v = 0;
+
+	/*
+	 * FIXME psr2_support is messed up. It's both computed
+	 * dynamically during PSR enable, and extracted from sink
+	 * caps during eDP detection.
+	 */
+	if (!dev_priv->psr.sink_psr2_support)
+		return false;
+
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
+		psr_max_h = 4096;
+		psr_max_v = 2304;
+	} else if (IS_GEN9(dev_priv)) {
+		psr_max_h = 3640;
+		psr_max_v = 2304;
+	}
+
+	if (crtc_hdisplay > psr_max_h || crtc_vdisplay > psr_max_v) {
+		DRM_DEBUG_KMS("PSR2 not enabled, resolution %dx%d > max supported %dx%d\n",
+			      crtc_hdisplay, crtc_vdisplay,
+			      psr_max_h, psr_max_v);
+		return false;
+	}
+
+	return true;
+}
+
+void intel_psr_compute_config(struct intel_dp *intel_dp,
+			      struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->base.adjusted_mode;
+	int psr_setup_time;
+
+	if (!CAN_PSR(dev_priv))
+		return;
+
+	if (!i915_modparams.enable_psr) {
+		DRM_DEBUG_KMS("PSR disable by flag\n");
+		return;
+	}
+
+	/*
+	 * HSW spec explicitly says PSR is tied to port A.
+	 * BDW+ platforms with DDI implementation of PSR have different
+	 * PSR registers per transcoder and we only implement transcoder EDP
+	 * ones. Since by Display design transcoder EDP is tied to port A
+	 * we can safely escape based on the port A.
+	 */
+	if (dig_port->base.port != PORT_A) {
+		DRM_DEBUG_KMS("PSR condition failed: Port not supported\n");
+		return;
+	}
+
+	if (IS_HASWELL(dev_priv) &&
+	    I915_READ(HSW_STEREO_3D_CTL(crtc_state->cpu_transcoder)) &
+		      S3D_ENABLE) {
+		DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
+		return;
+	}
+
+	if (IS_HASWELL(dev_priv) &&
+	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
+		DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
+		return;
+	}
+
+	psr_setup_time = drm_dp_psr_setup_time(intel_dp->psr_dpcd);
+	if (psr_setup_time < 0) {
+		DRM_DEBUG_KMS("PSR condition failed: Invalid PSR setup time (0x%02x)\n",
+			      intel_dp->psr_dpcd[1]);
+		return;
+	}
+
+	if (intel_usecs_to_scanlines(adjusted_mode, psr_setup_time) >
+	    adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay - 1) {
+		DRM_DEBUG_KMS("PSR condition failed: PSR setup time (%d us) too long\n",
+			      psr_setup_time);
+		return;
+	}
+
+	crtc_state->has_psr = true;
+	crtc_state->has_psr2 = intel_psr2_config_valid(intel_dp, crtc_state);
+	DRM_DEBUG_KMS("Enabling PSR%s\n", crtc_state->has_psr2 ? "2" : "");
+}
+
+static void intel_psr_activate(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (INTEL_GEN(dev_priv) >= 9)
+		WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
+	WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
+	WARN_ON(dev_priv->psr.active);
+	lockdep_assert_held(&dev_priv->psr.lock);
+
+	/* psr1 and psr2 are mutually exclusive.*/
+	if (dev_priv->psr.psr2_enabled)
+		hsw_activate_psr2(intel_dp);
+	else
+		hsw_activate_psr1(intel_dp);
+
+	dev_priv->psr.active = true;
+}
+
+static void intel_psr_enable_source(struct intel_dp *intel_dp,
+				    const struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	/* Only HSW and BDW have PSR AUX registers that need to be setup. SKL+
+	 * use hardcoded values PSR AUX transactions
+	 */
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+		hsw_psr_setup_aux(intel_dp);
+
+	if (dev_priv->psr.psr2_enabled) {
+		u32 chicken = I915_READ(CHICKEN_TRANS(cpu_transcoder));
+
+		if (INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv))
+			chicken |= (PSR2_VSC_ENABLE_PROG_HEADER
+				   | PSR2_ADD_VERTICAL_LINE_COUNT);
+
+		else
+			chicken &= ~VSC_DATA_SEL_SOFTWARE_CONTROL;
+		I915_WRITE(CHICKEN_TRANS(cpu_transcoder), chicken);
+
+		I915_WRITE(EDP_PSR_DEBUG,
+			   EDP_PSR_DEBUG_MASK_MEMUP |
+			   EDP_PSR_DEBUG_MASK_HPD |
+			   EDP_PSR_DEBUG_MASK_LPSP |
+			   EDP_PSR_DEBUG_MASK_MAX_SLEEP |
+			   EDP_PSR_DEBUG_MASK_DISP_REG_WRITE);
+	} else {
+		/*
+		 * Per Spec: Avoid continuous PSR exit by masking MEMUP
+		 * and HPD. also mask LPSP to avoid dependency on other
+		 * drivers that might block runtime_pm besides
+		 * preventing  other hw tracking issues now we can rely
+		 * on frontbuffer tracking.
+		 */
+		I915_WRITE(EDP_PSR_DEBUG,
+			   EDP_PSR_DEBUG_MASK_MEMUP |
+			   EDP_PSR_DEBUG_MASK_HPD |
+			   EDP_PSR_DEBUG_MASK_LPSP |
+			   EDP_PSR_DEBUG_MASK_DISP_REG_WRITE |
+			   EDP_PSR_DEBUG_MASK_MAX_SLEEP);
+	}
+}
+
+/**
+ * intel_psr_enable - Enable PSR
+ * @intel_dp: Intel DP
+ * @crtc_state: new CRTC state
+ *
+ * This function can only be called after the pipe is fully trained and enabled.
+ */
+void intel_psr_enable(struct intel_dp *intel_dp,
+		      const struct intel_crtc_state *crtc_state)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (!crtc_state->has_psr)
+		return;
+
+	if (WARN_ON(!CAN_PSR(dev_priv)))
+		return;
+
+	WARN_ON(dev_priv->drrs.dp);
+	mutex_lock(&dev_priv->psr.lock);
+	if (dev_priv->psr.enabled) {
+		DRM_DEBUG_KMS("PSR already in use\n");
+		goto unlock;
+	}
+
+	dev_priv->psr.psr2_enabled = crtc_state->has_psr2;
+	dev_priv->psr.busy_frontbuffer_bits = 0;
+
+	intel_psr_setup_vsc(intel_dp, crtc_state);
+	intel_psr_enable_sink(intel_dp);
+	intel_psr_enable_source(intel_dp, crtc_state);
+	dev_priv->psr.enabled = intel_dp;
+
+	intel_psr_activate(intel_dp);
+
+unlock:
+	mutex_unlock(&dev_priv->psr.lock);
+}
+
+static void
+intel_psr_disable_source(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (dev_priv->psr.active) {
+		i915_reg_t psr_status;
+		u32 psr_status_mask;
+
+		if (dev_priv->psr.psr2_enabled) {
+			psr_status = EDP_PSR2_STATUS;
+			psr_status_mask = EDP_PSR2_STATUS_STATE_MASK;
+
+			I915_WRITE(EDP_PSR2_CTL,
+				   I915_READ(EDP_PSR2_CTL) &
+				   ~(EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE));
+
+		} else {
+			psr_status = EDP_PSR_STATUS;
+			psr_status_mask = EDP_PSR_STATUS_STATE_MASK;
+
+			I915_WRITE(EDP_PSR_CTL,
+				   I915_READ(EDP_PSR_CTL) & ~EDP_PSR_ENABLE);
+		}
+
+		/* Wait till PSR is idle */
+		if (intel_wait_for_register(dev_priv,
+					    psr_status, psr_status_mask, 0,
+					    2000))
+			DRM_ERROR("Timed out waiting for PSR Idle State\n");
+
+		dev_priv->psr.active = false;
+	} else {
+		if (dev_priv->psr.psr2_enabled)
+			WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
+		else
+			WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
+	}
+}
+
+static void intel_psr_disable_locked(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	lockdep_assert_held(&dev_priv->psr.lock);
+
+	if (!dev_priv->psr.enabled)
+		return;
+
+	intel_psr_disable_source(intel_dp);
+
+	/* Disable PSR on Sink */
+	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
+
+	dev_priv->psr.enabled = NULL;
+}
+
+/**
+ * intel_psr_disable - Disable PSR
+ * @intel_dp: Intel DP
+ * @old_crtc_state: old CRTC state
+ *
+ * This function needs to be called before disabling pipe.
+ */
+void intel_psr_disable(struct intel_dp *intel_dp,
+		       const struct intel_crtc_state *old_crtc_state)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (!old_crtc_state->has_psr)
+		return;
+
+	if (WARN_ON(!CAN_PSR(dev_priv)))
+		return;
+
+	mutex_lock(&dev_priv->psr.lock);
+	intel_psr_disable_locked(intel_dp);
+	mutex_unlock(&dev_priv->psr.lock);
+	cancel_work_sync(&dev_priv->psr.work);
+}
+
+int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	i915_reg_t reg;
+	u32 mask;
+
+	if (!new_crtc_state->has_psr)
+		return 0;
+
+	/*
+	 * The sole user right now is intel_pipe_update_start(),
+	 * which won't race with psr_enable/disable, which is
+	 * where psr2_enabled is written to. So, we don't need
+	 * to acquire the psr.lock. More importantly, we want the
+	 * latency inside intel_pipe_update_start() to be as low
+	 * as possible, so no need to acquire psr.lock when it is
+	 * not needed and will induce latencies in the atomic
+	 * update path.
+	 */
+	if (dev_priv->psr.psr2_enabled) {
+		reg = EDP_PSR2_STATUS;
+		mask = EDP_PSR2_STATUS_STATE_MASK;
+	} else {
+		reg = EDP_PSR_STATUS;
+		mask = EDP_PSR_STATUS_STATE_MASK;
+	}
+
+	/*
+	 * Max time for PSR to idle = Inverse of the refresh rate +
+	 * 6 ms of exit training time + 1.5 ms of aux channel
+	 * handshake. 50 msec is defesive enough to cover everything.
+	 */
+	return intel_wait_for_register(dev_priv, reg, mask,
+				       EDP_PSR_STATUS_STATE_IDLE, 50);
+}
+
+static bool __psr_wait_for_idle_locked(struct drm_i915_private *dev_priv)
+{
+	struct intel_dp *intel_dp;
+	i915_reg_t reg;
+	u32 mask;
+	int err;
+
+	intel_dp = dev_priv->psr.enabled;
+	if (!intel_dp)
+		return false;
+
+	if (dev_priv->psr.psr2_enabled) {
+		reg = EDP_PSR2_STATUS;
+		mask = EDP_PSR2_STATUS_STATE_MASK;
+	} else {
+		reg = EDP_PSR_STATUS;
+		mask = EDP_PSR_STATUS_STATE_MASK;
+	}
+
+	mutex_unlock(&dev_priv->psr.lock);
+
+	err = intel_wait_for_register(dev_priv, reg, mask, 0, 50);
+	if (err)
+		DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
+
+	/* After the unlocked wait, verify that PSR is still wanted! */
+	mutex_lock(&dev_priv->psr.lock);
+	return err == 0 && dev_priv->psr.enabled;
+}
+
+static void intel_psr_work(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, typeof(*dev_priv), psr.work);
+
+	mutex_lock(&dev_priv->psr.lock);
+
+	if (!dev_priv->psr.enabled)
+		goto unlock;
+
+	/*
+	 * We have to make sure PSR is ready for re-enable
+	 * otherwise it keeps disabled until next full enable/disable cycle.
+	 * PSR might take some time to get fully disabled
+	 * and be ready for re-enable.
+	 */
+	if (!__psr_wait_for_idle_locked(dev_priv))
+		goto unlock;
+
+	/*
+	 * The delayed work can race with an invalidate hence we need to
+	 * recheck. Since psr_flush first clears this and then reschedules we
+	 * won't ever miss a flush when bailing out here.
+	 */
+	if (dev_priv->psr.busy_frontbuffer_bits || dev_priv->psr.active)
+		goto unlock;
+
+	intel_psr_activate(dev_priv->psr.enabled);
+unlock:
+	mutex_unlock(&dev_priv->psr.lock);
+}
+
+static void intel_psr_exit(struct drm_i915_private *dev_priv)
+{
+	u32 val;
+
+	if (!dev_priv->psr.active)
+		return;
+
+	if (dev_priv->psr.psr2_enabled) {
+		val = I915_READ(EDP_PSR2_CTL);
+		WARN_ON(!(val & EDP_PSR2_ENABLE));
+		I915_WRITE(EDP_PSR2_CTL, val & ~EDP_PSR2_ENABLE);
+	} else {
+		val = I915_READ(EDP_PSR_CTL);
+		WARN_ON(!(val & EDP_PSR_ENABLE));
+		I915_WRITE(EDP_PSR_CTL, val & ~EDP_PSR_ENABLE);
+	}
+	dev_priv->psr.active = false;
+}
+
+/**
+ * intel_psr_invalidate - Invalidade PSR
+ * @dev_priv: i915 device
+ * @frontbuffer_bits: frontbuffer plane tracking bits
+ * @origin: which operation caused the invalidate
+ *
+ * Since the hardware frontbuffer tracking has gaps we need to integrate
+ * with the software frontbuffer tracking. This function gets called every
+ * time frontbuffer rendering starts and a buffer gets dirtied. PSR must be
+ * disabled if the frontbuffer mask contains a buffer relevant to PSR.
+ *
+ * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits."
+ */
+void intel_psr_invalidate(struct drm_i915_private *dev_priv,
+			  unsigned frontbuffer_bits, enum fb_op_origin origin)
+{
+	struct drm_crtc *crtc;
+	enum pipe pipe;
+
+	if (!CAN_PSR(dev_priv))
+		return;
+
+	if (origin == ORIGIN_FLIP)
+		return;
+
+	mutex_lock(&dev_priv->psr.lock);
+	if (!dev_priv->psr.enabled) {
+		mutex_unlock(&dev_priv->psr.lock);
+		return;
+	}
+
+	crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
+	pipe = to_intel_crtc(crtc)->pipe;
+
+	frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
+	dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
+
+	if (frontbuffer_bits)
+		intel_psr_exit(dev_priv);
+
+	mutex_unlock(&dev_priv->psr.lock);
+}
+
+/**
+ * intel_psr_flush - Flush PSR
+ * @dev_priv: i915 device
+ * @frontbuffer_bits: frontbuffer plane tracking bits
+ * @origin: which operation caused the flush
+ *
+ * Since the hardware frontbuffer tracking has gaps we need to integrate
+ * with the software frontbuffer tracking. This function gets called every
+ * time frontbuffer rendering has completed and flushed out to memory. PSR
+ * can be enabled again if no other frontbuffer relevant to PSR is dirty.
+ *
+ * Dirty frontbuffers relevant to PSR are tracked in busy_frontbuffer_bits.
+ */
+void intel_psr_flush(struct drm_i915_private *dev_priv,
+		     unsigned frontbuffer_bits, enum fb_op_origin origin)
+{
+	struct drm_crtc *crtc;
+	enum pipe pipe;
+
+	if (!CAN_PSR(dev_priv))
+		return;
+
+	if (origin == ORIGIN_FLIP)
+		return;
+
+	mutex_lock(&dev_priv->psr.lock);
+	if (!dev_priv->psr.enabled) {
+		mutex_unlock(&dev_priv->psr.lock);
+		return;
+	}
+
+	crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
+	pipe = to_intel_crtc(crtc)->pipe;
+
+	frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
+	dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
+
+	/* By definition flush = invalidate + flush */
+	if (frontbuffer_bits) {
+		if (dev_priv->psr.psr2_enabled) {
+			intel_psr_exit(dev_priv);
+		} else {
+			/*
+			 * Display WA #0884: all
+			 * This documented WA for bxt can be safely applied
+			 * broadly so we can force HW tracking to exit PSR
+			 * instead of disabling and re-enabling.
+			 * Workaround tells us to write 0 to CUR_SURFLIVE_A,
+			 * but it makes more sense write to the current active
+			 * pipe.
+			 */
+			I915_WRITE(CURSURFLIVE(pipe), 0);
+		}
+	}
+
+	if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
+		schedule_work(&dev_priv->psr.work);
+	mutex_unlock(&dev_priv->psr.lock);
+}
+
+/**
+ * intel_psr_init - Init basic PSR work and mutex.
+ * @dev_priv: i915 device private
+ *
+ * This function is  called only once at driver load to initialize basic
+ * PSR stuff.
+ */
+void intel_psr_init(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_PSR(dev_priv))
+		return;
+
+	dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
+		HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
+
+	if (!dev_priv->psr.sink_support)
+		return;
+
+	if (i915_modparams.enable_psr == -1) {
+		i915_modparams.enable_psr = dev_priv->vbt.psr.enable;
+
+		/* Per platform default: all disabled. */
+		i915_modparams.enable_psr = 0;
+	}
+
+	/* Set link_standby x link_off defaults */
+	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+		/* HSW and BDW require workarounds that we don't implement. */
+		dev_priv->psr.link_standby = false;
+	else
+		/* For new platforms let's respect VBT back again */
+		dev_priv->psr.link_standby = dev_priv->vbt.psr.full_link;
+
+	INIT_WORK(&dev_priv->psr.work, intel_psr_work);
+	mutex_init(&dev_priv->psr.lock);
+}
+
+void intel_psr_short_pulse(struct intel_dp *intel_dp)
+{
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct i915_psr *psr = &dev_priv->psr;
+	u8 val;
+	const u8 errors = DP_PSR_RFB_STORAGE_ERROR |
+			  DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
+			  DP_PSR_LINK_CRC_ERROR;
+
+	if (!CAN_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
+		return;
+
+	mutex_lock(&psr->lock);
+
+	if (psr->enabled != intel_dp)
+		goto exit;
+
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val) != 1) {
+		DRM_ERROR("PSR_STATUS dpcd read failed\n");
+		goto exit;
+	}
+
+	if ((val & DP_PSR_SINK_STATE_MASK) == DP_PSR_SINK_INTERNAL_ERROR) {
+		DRM_DEBUG_KMS("PSR sink internal error, disabling PSR\n");
+		intel_psr_disable_locked(intel_dp);
+	}
+
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_ERROR_STATUS, &val) != 1) {
+		DRM_ERROR("PSR_ERROR_STATUS dpcd read failed\n");
+		goto exit;
+	}
+
+	if (val & DP_PSR_RFB_STORAGE_ERROR)
+		DRM_DEBUG_KMS("PSR RFB storage error, disabling PSR\n");
+	if (val & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
+		DRM_DEBUG_KMS("PSR VSC SDP uncorrectable error, disabling PSR\n");
+	if (val & DP_PSR_LINK_CRC_ERROR)
+		DRM_ERROR("PSR Link CRC error, disabling PSR\n");
+
+	if (val & ~errors)
+		DRM_ERROR("PSR_ERROR_STATUS unhandled errors %x\n",
+			  val & ~errors);
+	if (val & errors)
+		intel_psr_disable_locked(intel_dp);
+	/* clear status register */
+	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, val);
+
+	/* TODO: handle PSR2 errors */
+exit:
+	mutex_unlock(&psr->lock);
+}