Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 1239 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
new file mode 100644
index 000000000..627d57817
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -0,0 +1,1239 @@
+/*
+ * Copyright 2016 Advanced Micro Devices, Inc.
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include <linux/slab.h>
+
+#include "dm_services.h"
+#include "dc.h"
+#include "mod_freesync.h"
+#include "core_types.h"
+
+#define MOD_FREESYNC_MAX_CONCURRENT_STREAMS  32
+
+#define MIN_REFRESH_RANGE 10
+/* Refresh rate ramp at a fixed rate of 65 Hz/second */
+#define STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME ((1000 / 60) * 65)
+/* Number of elements in the render times cache array */
+#define RENDER_TIMES_MAX_COUNT 10
+/* Threshold to exit/exit BTR (to avoid frequent enter-exits at the lower limit) */
+#define BTR_MAX_MARGIN 2500
+/* Threshold to change BTR multiplier (to avoid frequent changes) */
+#define BTR_DRIFT_MARGIN 2000
+/*Threshold to exit fixed refresh rate*/
+#define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4
+/* Number of consecutive frames to check before entering/exiting fixed refresh*/
+#define FIXED_REFRESH_ENTER_FRAME_COUNT 5
+#define FIXED_REFRESH_EXIT_FRAME_COUNT 5
+
+struct core_freesync {
+	struct mod_freesync public;
+	struct dc *dc;
+};
+
+#define MOD_FREESYNC_TO_CORE(mod_freesync)\
+		container_of(mod_freesync, struct core_freesync, public)
+
+struct mod_freesync *mod_freesync_create(struct dc *dc)
+{
+	struct core_freesync *core_freesync =
+			kzalloc(sizeof(struct core_freesync), GFP_KERNEL);
+
+	if (core_freesync == NULL)
+		goto fail_alloc_context;
+
+	if (dc == NULL)
+		goto fail_construct;
+
+	core_freesync->dc = dc;
+	return &core_freesync->public;
+
+fail_construct:
+	kfree(core_freesync);
+
+fail_alloc_context:
+	return NULL;
+}
+
+void mod_freesync_destroy(struct mod_freesync *mod_freesync)
+{
+	struct core_freesync *core_freesync = NULL;
+	if (mod_freesync == NULL)
+		return;
+	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
+	kfree(core_freesync);
+}
+
+#if 0 /* unused currently */
+static unsigned int calc_refresh_in_uhz_from_duration(
+		unsigned int duration_in_ns)
+{
+	unsigned int refresh_in_uhz =
+			((unsigned int)(div64_u64((1000000000ULL * 1000000),
+					duration_in_ns)));
+	return refresh_in_uhz;
+}
+#endif
+
+static unsigned int calc_duration_in_us_from_refresh_in_uhz(
+		unsigned int refresh_in_uhz)
+{
+	unsigned int duration_in_us =
+			((unsigned int)(div64_u64((1000000000ULL * 1000),
+					refresh_in_uhz)));
+	return duration_in_us;
+}
+
+static unsigned int calc_duration_in_us_from_v_total(
+		const struct dc_stream_state *stream,
+		const struct mod_vrr_params *in_vrr,
+		unsigned int v_total)
+{
+	unsigned int duration_in_us =
+			(unsigned int)(div64_u64(((unsigned long long)(v_total)
+				* 10000) * stream->timing.h_total,
+					stream->timing.pix_clk_100hz));
+
+	return duration_in_us;
+}
+
+static unsigned int calc_v_total_from_refresh(
+		const struct dc_stream_state *stream,
+		unsigned int refresh_in_uhz)
+{
+	unsigned int v_total;
+	unsigned int frame_duration_in_ns;
+
+	frame_duration_in_ns =
+			((unsigned int)(div64_u64((1000000000ULL * 1000000),
+					refresh_in_uhz)));
+
+	v_total = div64_u64(div64_u64(((unsigned long long)(
+			frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)),
+			stream->timing.h_total), 1000000);
+
+	/* v_total cannot be less than nominal */
+	if (v_total < stream->timing.v_total) {
+		ASSERT(v_total < stream->timing.v_total);
+		v_total = stream->timing.v_total;
+	}
+
+	return v_total;
+}
+
+static unsigned int calc_v_total_from_duration(
+		const struct dc_stream_state *stream,
+		const struct mod_vrr_params *vrr,
+		unsigned int duration_in_us)
+{
+	unsigned int v_total = 0;
+
+	if (duration_in_us < vrr->min_duration_in_us)
+		duration_in_us = vrr->min_duration_in_us;
+
+	if (duration_in_us > vrr->max_duration_in_us)
+		duration_in_us = vrr->max_duration_in_us;
+
+	v_total = div64_u64(div64_u64(((unsigned long long)(
+				duration_in_us) * (stream->timing.pix_clk_100hz / 10)),
+				stream->timing.h_total), 1000);
+
+	/* v_total cannot be less than nominal */
+	if (v_total < stream->timing.v_total) {
+		ASSERT(v_total < stream->timing.v_total);
+		v_total = stream->timing.v_total;
+	}
+
+	return v_total;
+}
+
+static void update_v_total_for_static_ramp(
+		struct core_freesync *core_freesync,
+		const struct dc_stream_state *stream,
+		struct mod_vrr_params *in_out_vrr)
+{
+	unsigned int v_total = 0;
+	unsigned int current_duration_in_us =
+			calc_duration_in_us_from_v_total(
+				stream, in_out_vrr,
+				in_out_vrr->adjust.v_total_max);
+	unsigned int target_duration_in_us =
+			calc_duration_in_us_from_refresh_in_uhz(
+				in_out_vrr->fixed.target_refresh_in_uhz);
+	bool ramp_direction_is_up = (current_duration_in_us >
+				target_duration_in_us) ? true : false;
+
+	/* Calc ratio between new and current frame duration with 3 digit */
+	unsigned int frame_duration_ratio = div64_u64(1000000,
+		(1000 +  div64_u64(((unsigned long long)(
+		STATIC_SCREEN_RAMP_DELTA_REFRESH_RATE_PER_FRAME) *
+		current_duration_in_us),
+		1000000)));
+
+	/* Calculate delta between new and current frame duration in us */
+	unsigned int frame_duration_delta = div64_u64(((unsigned long long)(
+		current_duration_in_us) *
+		(1000 - frame_duration_ratio)), 1000);
+
+	/* Adjust frame duration delta based on ratio between current and
+	 * standard frame duration (frame duration at 60 Hz refresh rate).
+	 */
+	unsigned int ramp_rate_interpolated = div64_u64(((unsigned long long)(
+		frame_duration_delta) * current_duration_in_us), 16666);
+
+	/* Going to a higher refresh rate (lower frame duration) */
+	if (ramp_direction_is_up) {
+		/* reduce frame duration */
+		current_duration_in_us -= ramp_rate_interpolated;
+
+		/* adjust for frame duration below min */
+		if (current_duration_in_us <= target_duration_in_us) {
+			in_out_vrr->fixed.ramping_active = false;
+			in_out_vrr->fixed.ramping_done = true;
+			current_duration_in_us =
+				calc_duration_in_us_from_refresh_in_uhz(
+				in_out_vrr->fixed.target_refresh_in_uhz);
+		}
+	/* Going to a lower refresh rate (larger frame duration) */
+	} else {
+		/* increase frame duration */
+		current_duration_in_us += ramp_rate_interpolated;
+
+		/* adjust for frame duration above max */
+		if (current_duration_in_us >= target_duration_in_us) {
+			in_out_vrr->fixed.ramping_active = false;
+			in_out_vrr->fixed.ramping_done = true;
+			current_duration_in_us =
+				calc_duration_in_us_from_refresh_in_uhz(
+				in_out_vrr->fixed.target_refresh_in_uhz);
+		}
+	}
+
+	v_total = div64_u64(div64_u64(((unsigned long long)(
+			current_duration_in_us) * (stream->timing.pix_clk_100hz / 10)),
+				stream->timing.h_total), 1000);
+
+	/* v_total cannot be less than nominal */
+	if (v_total < stream->timing.v_total)
+		v_total = stream->timing.v_total;
+
+	in_out_vrr->adjust.v_total_min = v_total;
+	in_out_vrr->adjust.v_total_max = v_total;
+}
+
+static void apply_below_the_range(struct core_freesync *core_freesync,
+		const struct dc_stream_state *stream,
+		unsigned int last_render_time_in_us,
+		struct mod_vrr_params *in_out_vrr)
+{
+	unsigned int inserted_frame_duration_in_us = 0;
+	unsigned int mid_point_frames_ceil = 0;
+	unsigned int mid_point_frames_floor = 0;
+	unsigned int frame_time_in_us = 0;
+	unsigned int delta_from_mid_point_in_us_1 = 0xFFFFFFFF;
+	unsigned int delta_from_mid_point_in_us_2 = 0xFFFFFFFF;
+	unsigned int frames_to_insert = 0;
+	unsigned int delta_from_mid_point_delta_in_us;
+	unsigned int max_render_time_in_us =
+			in_out_vrr->max_duration_in_us - in_out_vrr->btr.margin_in_us;
+
+	/* Program BTR */
+	if ((last_render_time_in_us + in_out_vrr->btr.margin_in_us / 2) < max_render_time_in_us) {
+		/* Exit Below the Range */
+		if (in_out_vrr->btr.btr_active) {
+			in_out_vrr->btr.frame_counter = 0;
+			in_out_vrr->btr.btr_active = false;
+		}
+	} else if (last_render_time_in_us > (max_render_time_in_us + in_out_vrr->btr.margin_in_us / 2)) {
+		/* Enter Below the Range */
+		if (!in_out_vrr->btr.btr_active) {
+			in_out_vrr->btr.btr_active = true;
+		}
+	}
+
+	/* BTR set to "not active" so disengage */
+	if (!in_out_vrr->btr.btr_active) {
+		in_out_vrr->btr.inserted_duration_in_us = 0;
+		in_out_vrr->btr.frames_to_insert = 0;
+		in_out_vrr->btr.frame_counter = 0;
+
+		/* Restore FreeSync */
+		in_out_vrr->adjust.v_total_min =
+			calc_v_total_from_refresh(stream,
+				in_out_vrr->max_refresh_in_uhz);
+		in_out_vrr->adjust.v_total_max =
+			calc_v_total_from_refresh(stream,
+				in_out_vrr->min_refresh_in_uhz);
+	/* BTR set to "active" so engage */
+	} else {
+
+		/* Calculate number of midPoint frames that could fit within
+		 * the render time interval- take ceil of this value
+		 */
+		mid_point_frames_ceil = (last_render_time_in_us +
+				in_out_vrr->btr.mid_point_in_us - 1) /
+					in_out_vrr->btr.mid_point_in_us;
+
+		if (mid_point_frames_ceil > 0) {
+			frame_time_in_us = last_render_time_in_us /
+				mid_point_frames_ceil;
+			delta_from_mid_point_in_us_1 =
+				(in_out_vrr->btr.mid_point_in_us >
+				frame_time_in_us) ?
+				(in_out_vrr->btr.mid_point_in_us - frame_time_in_us) :
+				(frame_time_in_us - in_out_vrr->btr.mid_point_in_us);
+		}
+
+		/* Calculate number of midPoint frames that could fit within
+		 * the render time interval- take floor of this value
+		 */
+		mid_point_frames_floor = last_render_time_in_us /
+				in_out_vrr->btr.mid_point_in_us;
+
+		if (mid_point_frames_floor > 0) {
+
+			frame_time_in_us = last_render_time_in_us /
+				mid_point_frames_floor;
+			delta_from_mid_point_in_us_2 =
+				(in_out_vrr->btr.mid_point_in_us >
+				frame_time_in_us) ?
+				(in_out_vrr->btr.mid_point_in_us - frame_time_in_us) :
+				(frame_time_in_us - in_out_vrr->btr.mid_point_in_us);
+		}
+
+		/* Choose number of frames to insert based on how close it
+		 * can get to the mid point of the variable range.
+		 *  - Delta for CEIL: delta_from_mid_point_in_us_1
+		 *  - Delta for FLOOR: delta_from_mid_point_in_us_2
+		 */
+		if (mid_point_frames_ceil &&
+		    (last_render_time_in_us / mid_point_frames_ceil) <
+		    in_out_vrr->min_duration_in_us) {
+			/* Check for out of range.
+			 * If using CEIL produces a value that is out of range,
+			 * then we are forced to use FLOOR.
+			 */
+			frames_to_insert = mid_point_frames_floor;
+		} else if (mid_point_frames_floor < 2) {
+			/* Check if FLOOR would result in non-LFC. In this case
+			 * choose to use CEIL
+			 */
+			frames_to_insert = mid_point_frames_ceil;
+		} else if (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2) {
+			/* If choosing CEIL results in a frame duration that is
+			 * closer to the mid point of the range.
+			 * Choose CEIL
+			 */
+			frames_to_insert = mid_point_frames_ceil;
+		} else {
+			/* If choosing FLOOR results in a frame duration that is
+			 * closer to the mid point of the range.
+			 * Choose FLOOR
+			 */
+			frames_to_insert = mid_point_frames_floor;
+		}
+
+		/* Prefer current frame multiplier when BTR is enabled unless it drifts
+		 * too far from the midpoint
+		 */
+		if (delta_from_mid_point_in_us_1 < delta_from_mid_point_in_us_2) {
+			delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_2 -
+					delta_from_mid_point_in_us_1;
+		} else {
+			delta_from_mid_point_delta_in_us = delta_from_mid_point_in_us_1 -
+					delta_from_mid_point_in_us_2;
+		}
+		if (in_out_vrr->btr.frames_to_insert != 0 &&
+				delta_from_mid_point_delta_in_us < BTR_DRIFT_MARGIN) {
+			if (((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) <
+					max_render_time_in_us) &&
+				((last_render_time_in_us / in_out_vrr->btr.frames_to_insert) >
+					in_out_vrr->min_duration_in_us))
+				frames_to_insert = in_out_vrr->btr.frames_to_insert;
+		}
+
+		/* Either we've calculated the number of frames to insert,
+		 * or we need to insert min duration frames
+		 */
+		if (frames_to_insert &&
+		    (last_render_time_in_us / frames_to_insert) <
+		    in_out_vrr->min_duration_in_us){
+			frames_to_insert -= (frames_to_insert > 1) ?
+					1 : 0;
+		}
+
+		if (frames_to_insert > 0)
+			inserted_frame_duration_in_us = last_render_time_in_us /
+							frames_to_insert;
+
+		if (inserted_frame_duration_in_us < in_out_vrr->min_duration_in_us)
+			inserted_frame_duration_in_us = in_out_vrr->min_duration_in_us;
+
+		/* Cache the calculated variables */
+		in_out_vrr->btr.inserted_duration_in_us =
+			inserted_frame_duration_in_us;
+		in_out_vrr->btr.frames_to_insert = frames_to_insert;
+		in_out_vrr->btr.frame_counter = frames_to_insert;
+	}
+}
+
+static void apply_fixed_refresh(struct core_freesync *core_freesync,
+		const struct dc_stream_state *stream,
+		unsigned int last_render_time_in_us,
+		struct mod_vrr_params *in_out_vrr)
+{
+	bool update = false;
+	unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us;
+
+	/* Compute the exit refresh rate and exit frame duration */
+	unsigned int exit_refresh_rate_in_milli_hz = ((1000000000/max_render_time_in_us)
+			+ (1000*FIXED_REFRESH_EXIT_MARGIN_IN_HZ));
+	unsigned int exit_frame_duration_in_us = 1000000000/exit_refresh_rate_in_milli_hz;
+
+	if (last_render_time_in_us < exit_frame_duration_in_us) {
+		/* Exit Fixed Refresh mode */
+		if (in_out_vrr->fixed.fixed_active) {
+			in_out_vrr->fixed.frame_counter++;
+
+			if (in_out_vrr->fixed.frame_counter >
+					FIXED_REFRESH_EXIT_FRAME_COUNT) {
+				in_out_vrr->fixed.frame_counter = 0;
+				in_out_vrr->fixed.fixed_active = false;
+				in_out_vrr->fixed.target_refresh_in_uhz = 0;
+				update = true;
+			}
+		}
+	} else if (last_render_time_in_us > max_render_time_in_us) {
+		/* Enter Fixed Refresh mode */
+		if (!in_out_vrr->fixed.fixed_active) {
+			in_out_vrr->fixed.frame_counter++;
+
+			if (in_out_vrr->fixed.frame_counter >
+					FIXED_REFRESH_ENTER_FRAME_COUNT) {
+				in_out_vrr->fixed.frame_counter = 0;
+				in_out_vrr->fixed.fixed_active = true;
+				in_out_vrr->fixed.target_refresh_in_uhz =
+						in_out_vrr->max_refresh_in_uhz;
+				update = true;
+			}
+		}
+	}
+
+	if (update) {
+		if (in_out_vrr->fixed.fixed_active) {
+			in_out_vrr->adjust.v_total_min =
+				calc_v_total_from_refresh(
+				stream, in_out_vrr->max_refresh_in_uhz);
+			in_out_vrr->adjust.v_total_max =
+					in_out_vrr->adjust.v_total_min;
+		} else {
+			in_out_vrr->adjust.v_total_min =
+				calc_v_total_from_refresh(stream,
+					in_out_vrr->max_refresh_in_uhz);
+			in_out_vrr->adjust.v_total_max =
+				calc_v_total_from_refresh(stream,
+					in_out_vrr->min_refresh_in_uhz);
+		}
+	}
+}
+
+static bool vrr_settings_require_update(struct core_freesync *core_freesync,
+		struct mod_freesync_config *in_config,
+		unsigned int min_refresh_in_uhz,
+		unsigned int max_refresh_in_uhz,
+		struct mod_vrr_params *in_vrr)
+{
+	if (in_vrr->state != in_config->state) {
+		return true;
+	} else if (in_vrr->state == VRR_STATE_ACTIVE_FIXED &&
+			in_vrr->fixed.target_refresh_in_uhz !=
+					in_config->fixed_refresh_in_uhz) {
+		return true;
+	} else if (in_vrr->min_refresh_in_uhz != min_refresh_in_uhz) {
+		return true;
+	} else if (in_vrr->max_refresh_in_uhz != max_refresh_in_uhz) {
+		return true;
+	}
+
+	return false;
+}
+
+bool mod_freesync_get_vmin_vmax(struct mod_freesync *mod_freesync,
+		const struct dc_stream_state *stream,
+		unsigned int *vmin,
+		unsigned int *vmax)
+{
+	*vmin = stream->adjust.v_total_min;
+	*vmax = stream->adjust.v_total_max;
+
+	return true;
+}
+
+bool mod_freesync_get_v_position(struct mod_freesync *mod_freesync,
+		struct dc_stream_state *stream,
+		unsigned int *nom_v_pos,
+		unsigned int *v_pos)
+{
+	struct core_freesync *core_freesync = NULL;
+	struct crtc_position position;
+
+	if (mod_freesync == NULL)
+		return false;
+
+	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
+
+	if (dc_stream_get_crtc_position(core_freesync->dc, &stream, 1,
+					&position.vertical_count,
+					&position.nominal_vcount)) {
+
+		*nom_v_pos = position.nominal_vcount;
+		*v_pos = position.vertical_count;
+
+		return true;
+	}
+
+	return false;
+}
+
+static void build_vrr_infopacket_data_v1(const struct mod_vrr_params *vrr,
+		struct dc_info_packet *infopacket)
+{
+	/* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */
+	infopacket->sb[1] = 0x1A;
+
+	/* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */
+	infopacket->sb[2] = 0x00;
+
+	/* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */
+	infopacket->sb[3] = 0x00;
+
+	/* PB4 = Reserved */
+
+	/* PB5 = Reserved */
+
+	/* PB6 = [Bits 7:3 = Reserved] */
+
+	/* PB6 = [Bit 0 = FreeSync Supported] */
+	if (vrr->state != VRR_STATE_UNSUPPORTED)
+		infopacket->sb[6] |= 0x01;
+
+	/* PB6 = [Bit 1 = FreeSync Enabled] */
+	if (vrr->state != VRR_STATE_DISABLED &&
+			vrr->state != VRR_STATE_UNSUPPORTED)
+		infopacket->sb[6] |= 0x02;
+
+	/* PB6 = [Bit 2 = FreeSync Active] */
+	if (vrr->state == VRR_STATE_ACTIVE_VARIABLE ||
+			vrr->state == VRR_STATE_ACTIVE_FIXED)
+		infopacket->sb[6] |= 0x04;
+
+	// For v1 & 2 infoframes program nominal if non-fs mode, otherwise full range
+	/* PB7 = FreeSync Minimum refresh rate (Hz) */
+	if (vrr->state == VRR_STATE_ACTIVE_VARIABLE ||
+			vrr->state == VRR_STATE_ACTIVE_FIXED) {
+		infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000);
+	} else {
+		infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
+	}
+
+	/* PB8 = FreeSync Maximum refresh rate (Hz)
+	 * Note: We should never go above the field rate of the mode timing set.
+	 */
+	infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
+
+	//FreeSync HDR
+	infopacket->sb[9] = 0;
+	infopacket->sb[10] = 0;
+}
+
+static void build_vrr_infopacket_data_v3(const struct mod_vrr_params *vrr,
+		struct dc_info_packet *infopacket)
+{
+	/* PB1 = 0x1A (24bit AMD IEEE OUI (0x00001A) - Byte 0) */
+	infopacket->sb[1] = 0x1A;
+
+	/* PB2 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 1) */
+	infopacket->sb[2] = 0x00;
+
+	/* PB3 = 0x00 (24bit AMD IEEE OUI (0x00001A) - Byte 2) */
+	infopacket->sb[3] = 0x00;
+
+	/* PB4 = Reserved */
+
+	/* PB5 = Reserved */
+
+	/* PB6 = [Bits 7:3 = Reserved] */
+
+	/* PB6 = [Bit 0 = FreeSync Supported] */
+	if (vrr->state != VRR_STATE_UNSUPPORTED)
+		infopacket->sb[6] |= 0x01;
+
+	/* PB6 = [Bit 1 = FreeSync Enabled] */
+	if (vrr->state != VRR_STATE_DISABLED &&
+			vrr->state != VRR_STATE_UNSUPPORTED)
+		infopacket->sb[6] |= 0x02;
+
+	/* PB6 = [Bit 2 = FreeSync Active] */
+	if (vrr->state == VRR_STATE_ACTIVE_VARIABLE ||
+			vrr->state == VRR_STATE_ACTIVE_FIXED)
+		infopacket->sb[6] |= 0x04;
+
+	if (vrr->state == VRR_STATE_ACTIVE_FIXED) {
+		/* PB7 = FreeSync Minimum refresh rate (Hz) */
+		infopacket->sb[7] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000);
+		/* PB8 = FreeSync Maximum refresh rate (Hz) */
+		infopacket->sb[8] = (unsigned char)((vrr->fixed_refresh_in_uhz + 500000) / 1000000);
+	} else if (vrr->state == VRR_STATE_ACTIVE_VARIABLE) {
+		/* PB7 = FreeSync Minimum refresh rate (Hz) */
+		infopacket->sb[7] = (unsigned char)((vrr->min_refresh_in_uhz + 500000) / 1000000);
+		/* PB8 = FreeSync Maximum refresh rate (Hz) */
+		infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
+	} else {
+		// Non-fs case, program nominal range
+		/* PB7 = FreeSync Minimum refresh rate (Hz) */
+		infopacket->sb[7] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
+		/* PB8 = FreeSync Maximum refresh rate (Hz) */
+		infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
+	}
+
+	//FreeSync HDR
+	infopacket->sb[9] = 0;
+	infopacket->sb[10] = 0;
+}
+
+static void build_vrr_infopacket_fs2_data(enum color_transfer_func app_tf,
+		struct dc_info_packet *infopacket)
+{
+	if (app_tf != TRANSFER_FUNC_UNKNOWN) {
+		infopacket->valid = true;
+
+		infopacket->sb[6] |= 0x08;  // PB6 = [Bit 3 = Native Color Active]
+
+		if (app_tf == TRANSFER_FUNC_GAMMA_22) {
+			infopacket->sb[9] |= 0x04;  // PB6 = [Bit 2 = Gamma 2.2 EOTF Active]
+		}
+	}
+}
+
+static void build_vrr_infopacket_header_v1(enum signal_type signal,
+		struct dc_info_packet *infopacket,
+		unsigned int *payload_size)
+{
+	if (dc_is_hdmi_signal(signal)) {
+
+		/* HEADER */
+
+		/* HB0  = Packet Type = 0x83 (Source Product
+		 *	  Descriptor InfoFrame)
+		 */
+		infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD;
+
+		/* HB1  = Version = 0x01 */
+		infopacket->hb1 = 0x01;
+
+		/* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x08] */
+		infopacket->hb2 = 0x08;
+
+		*payload_size = 0x08;
+
+	} else if (dc_is_dp_signal(signal)) {
+
+		/* HEADER */
+
+		/* HB0  = Secondary-data Packet ID = 0 - Only non-zero
+		 *	  when used to associate audio related info packets
+		 */
+		infopacket->hb0 = 0x00;
+
+		/* HB1  = Packet Type = 0x83 (Source Product
+		 *	  Descriptor InfoFrame)
+		 */
+		infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD;
+
+		/* HB2  = [Bits 7:0 = Least significant eight bits -
+		 *	  For INFOFRAME, the value must be 1Bh]
+		 */
+		infopacket->hb2 = 0x1B;
+
+		/* HB3  = [Bits 7:2 = INFOFRAME SDP Version Number = 0x1]
+		 *	  [Bits 1:0 = Most significant two bits = 0x00]
+		 */
+		infopacket->hb3 = 0x04;
+
+		*payload_size = 0x1B;
+	}
+}
+
+static void build_vrr_infopacket_header_v2(enum signal_type signal,
+		struct dc_info_packet *infopacket,
+		unsigned int *payload_size)
+{
+	if (dc_is_hdmi_signal(signal)) {
+
+		/* HEADER */
+
+		/* HB0  = Packet Type = 0x83 (Source Product
+		 *	  Descriptor InfoFrame)
+		 */
+		infopacket->hb0 = DC_HDMI_INFOFRAME_TYPE_SPD;
+
+		/* HB1  = Version = 0x02 */
+		infopacket->hb1 = 0x02;
+
+		/* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x09] */
+		infopacket->hb2 = 0x09;
+
+		*payload_size = 0x0A;
+
+	} else if (dc_is_dp_signal(signal)) {
+
+		/* HEADER */
+
+		/* HB0  = Secondary-data Packet ID = 0 - Only non-zero
+		 *	  when used to associate audio related info packets
+		 */
+		infopacket->hb0 = 0x00;
+
+		/* HB1  = Packet Type = 0x83 (Source Product
+		 *	  Descriptor InfoFrame)
+		 */
+		infopacket->hb1 = DC_HDMI_INFOFRAME_TYPE_SPD;
+
+		/* HB2  = [Bits 7:0 = Least significant eight bits -
+		 *	  For INFOFRAME, the value must be 1Bh]
+		 */
+		infopacket->hb2 = 0x1B;
+
+		/* HB3  = [Bits 7:2 = INFOFRAME SDP Version Number = 0x2]
+		 *	  [Bits 1:0 = Most significant two bits = 0x00]
+		 */
+		infopacket->hb3 = 0x08;
+
+		*payload_size = 0x1B;
+	}
+}
+
+static void build_vrr_infopacket_checksum(unsigned int *payload_size,
+		struct dc_info_packet *infopacket)
+{
+	/* Calculate checksum */
+	unsigned int idx = 0;
+	unsigned char checksum = 0;
+
+	checksum += infopacket->hb0;
+	checksum += infopacket->hb1;
+	checksum += infopacket->hb2;
+	checksum += infopacket->hb3;
+
+	for (idx = 1; idx <= *payload_size; idx++)
+		checksum += infopacket->sb[idx];
+
+	/* PB0 = Checksum (one byte complement) */
+	infopacket->sb[0] = (unsigned char)(0x100 - checksum);
+
+	infopacket->valid = true;
+}
+
+static void build_vrr_infopacket_v1(enum signal_type signal,
+		const struct mod_vrr_params *vrr,
+		struct dc_info_packet *infopacket)
+{
+	/* SPD info packet for FreeSync */
+	unsigned int payload_size = 0;
+
+	build_vrr_infopacket_header_v1(signal, infopacket, &payload_size);
+	build_vrr_infopacket_data_v1(vrr, infopacket);
+	build_vrr_infopacket_checksum(&payload_size, infopacket);
+
+	infopacket->valid = true;
+}
+
+static void build_vrr_infopacket_v2(enum signal_type signal,
+		const struct mod_vrr_params *vrr,
+		enum color_transfer_func app_tf,
+		struct dc_info_packet *infopacket)
+{
+	unsigned int payload_size = 0;
+
+	build_vrr_infopacket_header_v2(signal, infopacket, &payload_size);
+	build_vrr_infopacket_data_v1(vrr, infopacket);
+
+	build_vrr_infopacket_fs2_data(app_tf, infopacket);
+
+	build_vrr_infopacket_checksum(&payload_size, infopacket);
+
+	infopacket->valid = true;
+}
+#ifndef TRIM_FSFT
+static void build_vrr_infopacket_fast_transport_data(
+	bool ftActive,
+	unsigned int ftOutputRate,
+	struct dc_info_packet *infopacket)
+{
+	/* PB9 : bit7 - fast transport Active*/
+	unsigned char activeBit = (ftActive) ? 1 << 7 : 0;
+
+	infopacket->sb[1] &= ~activeBit;  //clear bit
+	infopacket->sb[1] |=  activeBit;  //set bit
+
+	/* PB13 : Target Output Pixel Rate [kHz] - bits 7:0  */
+	infopacket->sb[13] = ftOutputRate & 0xFF;
+
+	/* PB14 : Target Output Pixel Rate [kHz] - bits 15:8  */
+	infopacket->sb[14] = (ftOutputRate >> 8) & 0xFF;
+
+	/* PB15 : Target Output Pixel Rate [kHz] - bits 23:16  */
+	infopacket->sb[15] = (ftOutputRate >> 16) & 0xFF;
+
+}
+#endif
+
+static void build_vrr_infopacket_v3(enum signal_type signal,
+		const struct mod_vrr_params *vrr,
+#ifndef TRIM_FSFT
+		bool ftActive, unsigned int ftOutputRate,
+#endif
+		enum color_transfer_func app_tf,
+		struct dc_info_packet *infopacket)
+{
+	unsigned int payload_size = 0;
+
+	build_vrr_infopacket_header_v2(signal, infopacket, &payload_size);
+	build_vrr_infopacket_data_v3(vrr, infopacket);
+
+	build_vrr_infopacket_fs2_data(app_tf, infopacket);
+
+#ifndef TRIM_FSFT
+	build_vrr_infopacket_fast_transport_data(
+			ftActive,
+			ftOutputRate,
+			infopacket);
+#endif
+
+	build_vrr_infopacket_checksum(&payload_size, infopacket);
+
+	infopacket->valid = true;
+}
+
+void mod_freesync_build_vrr_infopacket(struct mod_freesync *mod_freesync,
+		const struct dc_stream_state *stream,
+		const struct mod_vrr_params *vrr,
+		enum vrr_packet_type packet_type,
+		enum color_transfer_func app_tf,
+		struct dc_info_packet *infopacket)
+{
+	/* SPD info packet for FreeSync
+	 * VTEM info packet for HdmiVRR
+	 * Check if Freesync is supported. Return if false. If true,
+	 * set the corresponding bit in the info packet
+	 */
+	if (!vrr->send_info_frame)
+		return;
+
+	switch (packet_type) {
+	case PACKET_TYPE_FS_V3:
+#ifndef TRIM_FSFT
+		// always populate with pixel rate.
+		build_vrr_infopacket_v3(
+				stream->signal, vrr,
+				stream->timing.flags.FAST_TRANSPORT,
+				(stream->timing.flags.FAST_TRANSPORT) ?
+						stream->timing.fast_transport_output_rate_100hz :
+						stream->timing.pix_clk_100hz,
+				app_tf, infopacket);
+#else
+		build_vrr_infopacket_v3(stream->signal, vrr, app_tf, infopacket);
+#endif
+		break;
+	case PACKET_TYPE_FS_V2:
+		build_vrr_infopacket_v2(stream->signal, vrr, app_tf, infopacket);
+		break;
+	case PACKET_TYPE_VRR:
+	case PACKET_TYPE_FS_V1:
+	default:
+		build_vrr_infopacket_v1(stream->signal, vrr, infopacket);
+	}
+}
+
+void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
+		const struct dc_stream_state *stream,
+		struct mod_freesync_config *in_config,
+		struct mod_vrr_params *in_out_vrr)
+{
+	struct core_freesync *core_freesync = NULL;
+	unsigned long long nominal_field_rate_in_uhz = 0;
+	unsigned long long rounded_nominal_in_uhz = 0;
+	unsigned int refresh_range = 0;
+	unsigned long long min_refresh_in_uhz = 0;
+	unsigned long long max_refresh_in_uhz = 0;
+
+	if (mod_freesync == NULL)
+		return;
+
+	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
+
+	/* Calculate nominal field rate for stream */
+	nominal_field_rate_in_uhz =
+			mod_freesync_calc_nominal_field_rate(stream);
+
+	min_refresh_in_uhz = in_config->min_refresh_in_uhz;
+	max_refresh_in_uhz = in_config->max_refresh_in_uhz;
+
+	// Full range may be larger than current video timing, so cap at nominal
+	if (max_refresh_in_uhz > nominal_field_rate_in_uhz)
+		max_refresh_in_uhz = nominal_field_rate_in_uhz;
+
+	// Full range may be larger than current video timing, so cap at nominal
+	if (min_refresh_in_uhz > max_refresh_in_uhz)
+		min_refresh_in_uhz = max_refresh_in_uhz;
+
+	// If a monitor reports exactly max refresh of 2x of min, enforce it on nominal
+	rounded_nominal_in_uhz =
+			div_u64(nominal_field_rate_in_uhz + 50000, 100000) * 100000;
+	if (in_config->max_refresh_in_uhz == (2 * in_config->min_refresh_in_uhz) &&
+		in_config->max_refresh_in_uhz == rounded_nominal_in_uhz)
+		min_refresh_in_uhz = div_u64(nominal_field_rate_in_uhz, 2);
+
+	if (!vrr_settings_require_update(core_freesync,
+			in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz,
+			in_out_vrr))
+		return;
+
+	in_out_vrr->state = in_config->state;
+	in_out_vrr->send_info_frame = in_config->vsif_supported;
+
+	if (in_config->state == VRR_STATE_UNSUPPORTED) {
+		in_out_vrr->state = VRR_STATE_UNSUPPORTED;
+		in_out_vrr->supported = false;
+		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
+		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
+
+		return;
+
+	} else {
+		in_out_vrr->min_refresh_in_uhz = (unsigned int)min_refresh_in_uhz;
+		in_out_vrr->max_duration_in_us =
+				calc_duration_in_us_from_refresh_in_uhz(
+						(unsigned int)min_refresh_in_uhz);
+
+		in_out_vrr->max_refresh_in_uhz = (unsigned int)max_refresh_in_uhz;
+		in_out_vrr->min_duration_in_us =
+				calc_duration_in_us_from_refresh_in_uhz(
+						(unsigned int)max_refresh_in_uhz);
+
+		if (in_config->state == VRR_STATE_ACTIVE_FIXED)
+			in_out_vrr->fixed_refresh_in_uhz = in_config->fixed_refresh_in_uhz;
+		else
+			in_out_vrr->fixed_refresh_in_uhz = 0;
+
+		refresh_range = div_u64(in_out_vrr->max_refresh_in_uhz + 500000, 1000000) -
++				div_u64(in_out_vrr->min_refresh_in_uhz + 500000, 1000000);
+
+		in_out_vrr->supported = true;
+	}
+
+	in_out_vrr->fixed.ramping_active = in_config->ramping;
+
+	in_out_vrr->btr.btr_enabled = in_config->btr;
+
+	if (in_out_vrr->max_refresh_in_uhz < (2 * in_out_vrr->min_refresh_in_uhz))
+		in_out_vrr->btr.btr_enabled = false;
+	else {
+		in_out_vrr->btr.margin_in_us = in_out_vrr->max_duration_in_us -
+				2 * in_out_vrr->min_duration_in_us;
+		if (in_out_vrr->btr.margin_in_us > BTR_MAX_MARGIN)
+			in_out_vrr->btr.margin_in_us = BTR_MAX_MARGIN;
+	}
+
+	in_out_vrr->btr.btr_active = false;
+	in_out_vrr->btr.inserted_duration_in_us = 0;
+	in_out_vrr->btr.frames_to_insert = 0;
+	in_out_vrr->btr.frame_counter = 0;
+	in_out_vrr->fixed.fixed_active = false;
+	in_out_vrr->fixed.target_refresh_in_uhz = 0;
+
+	in_out_vrr->btr.mid_point_in_us =
+				(in_out_vrr->min_duration_in_us +
+				 in_out_vrr->max_duration_in_us) / 2;
+
+	if (in_out_vrr->state == VRR_STATE_UNSUPPORTED) {
+		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
+		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
+	} else if (in_out_vrr->state == VRR_STATE_DISABLED) {
+		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
+		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
+	} else if (in_out_vrr->state == VRR_STATE_INACTIVE) {
+		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
+		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
+	} else if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE &&
+			refresh_range >= MIN_REFRESH_RANGE) {
+
+		in_out_vrr->adjust.v_total_min =
+			calc_v_total_from_refresh(stream,
+				in_out_vrr->max_refresh_in_uhz);
+		in_out_vrr->adjust.v_total_max =
+			calc_v_total_from_refresh(stream,
+				in_out_vrr->min_refresh_in_uhz);
+	} else if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED) {
+		in_out_vrr->fixed.target_refresh_in_uhz =
+				in_out_vrr->fixed_refresh_in_uhz;
+		if (in_out_vrr->fixed.ramping_active &&
+				in_out_vrr->fixed.fixed_active) {
+			/* Do not update vtotals if ramping is already active
+			 * in order to continue ramp from current refresh.
+			 */
+			in_out_vrr->fixed.fixed_active = true;
+		} else {
+			in_out_vrr->fixed.fixed_active = true;
+			in_out_vrr->adjust.v_total_min =
+				calc_v_total_from_refresh(stream,
+					in_out_vrr->fixed.target_refresh_in_uhz);
+			in_out_vrr->adjust.v_total_max =
+				in_out_vrr->adjust.v_total_min;
+		}
+	} else {
+		in_out_vrr->state = VRR_STATE_INACTIVE;
+		in_out_vrr->adjust.v_total_min = stream->timing.v_total;
+		in_out_vrr->adjust.v_total_max = stream->timing.v_total;
+	}
+}
+
+void mod_freesync_handle_preflip(struct mod_freesync *mod_freesync,
+		const struct dc_plane_state *plane,
+		const struct dc_stream_state *stream,
+		unsigned int curr_time_stamp_in_us,
+		struct mod_vrr_params *in_out_vrr)
+{
+	struct core_freesync *core_freesync = NULL;
+	unsigned int last_render_time_in_us = 0;
+	unsigned int average_render_time_in_us = 0;
+
+	if (mod_freesync == NULL)
+		return;
+
+	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
+
+	if (in_out_vrr->supported &&
+			in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE) {
+		unsigned int i = 0;
+		unsigned int oldest_index = plane->time.index + 1;
+
+		if (oldest_index >= DC_PLANE_UPDATE_TIMES_MAX)
+			oldest_index = 0;
+
+		last_render_time_in_us = curr_time_stamp_in_us -
+				plane->time.prev_update_time_in_us;
+
+		// Sum off all entries except oldest one
+		for (i = 0; i < DC_PLANE_UPDATE_TIMES_MAX; i++) {
+			average_render_time_in_us +=
+					plane->time.time_elapsed_in_us[i];
+		}
+		average_render_time_in_us -=
+				plane->time.time_elapsed_in_us[oldest_index];
+
+		// Add render time for current flip
+		average_render_time_in_us += last_render_time_in_us;
+		average_render_time_in_us /= DC_PLANE_UPDATE_TIMES_MAX;
+
+		if (in_out_vrr->btr.btr_enabled) {
+			apply_below_the_range(core_freesync,
+					stream,
+					last_render_time_in_us,
+					in_out_vrr);
+		} else {
+			apply_fixed_refresh(core_freesync,
+				stream,
+				last_render_time_in_us,
+				in_out_vrr);
+		}
+
+	}
+}
+
+void mod_freesync_handle_v_update(struct mod_freesync *mod_freesync,
+		const struct dc_stream_state *stream,
+		struct mod_vrr_params *in_out_vrr)
+{
+	struct core_freesync *core_freesync = NULL;
+
+	if ((mod_freesync == NULL) || (stream == NULL) || (in_out_vrr == NULL))
+		return;
+
+	core_freesync = MOD_FREESYNC_TO_CORE(mod_freesync);
+
+	if (in_out_vrr->supported == false)
+		return;
+
+	/* Below the Range Logic */
+
+	/* Only execute if in fullscreen mode */
+	if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE &&
+					in_out_vrr->btr.btr_active) {
+		/* TODO: pass in flag for Pre-DCE12 ASIC
+		 * in order for frame variable duration to take affect,
+		 * it needs to be done one VSYNC early, which is at
+		 * frameCounter == 1.
+		 * For DCE12 and newer updates to V_TOTAL_MIN/MAX
+		 * will take affect on current frame
+		 */
+		if (in_out_vrr->btr.frames_to_insert ==
+				in_out_vrr->btr.frame_counter) {
+			in_out_vrr->adjust.v_total_min =
+				calc_v_total_from_duration(stream,
+				in_out_vrr,
+				in_out_vrr->btr.inserted_duration_in_us);
+			in_out_vrr->adjust.v_total_max =
+				in_out_vrr->adjust.v_total_min;
+		}
+
+		if (in_out_vrr->btr.frame_counter > 0)
+			in_out_vrr->btr.frame_counter--;
+
+		/* Restore FreeSync */
+		if (in_out_vrr->btr.frame_counter == 0) {
+			in_out_vrr->adjust.v_total_min =
+				calc_v_total_from_refresh(stream,
+				in_out_vrr->max_refresh_in_uhz);
+			in_out_vrr->adjust.v_total_max =
+				calc_v_total_from_refresh(stream,
+				in_out_vrr->min_refresh_in_uhz);
+		}
+	}
+
+	/* If in fullscreen freesync mode or in video, do not program
+	 * static screen ramp values
+	 */
+	if (in_out_vrr->state == VRR_STATE_ACTIVE_VARIABLE)
+		in_out_vrr->fixed.ramping_active = false;
+
+	/* Gradual Static Screen Ramping Logic */
+	/* Execute if ramp is active and user enabled freesync static screen*/
+	if (in_out_vrr->state == VRR_STATE_ACTIVE_FIXED &&
+				in_out_vrr->fixed.ramping_active) {
+		update_v_total_for_static_ramp(
+				core_freesync, stream, in_out_vrr);
+	}
+}
+
+void mod_freesync_get_settings(struct mod_freesync *mod_freesync,
+		const struct mod_vrr_params *vrr,
+		unsigned int *v_total_min, unsigned int *v_total_max,
+		unsigned int *event_triggers,
+		unsigned int *window_min, unsigned int *window_max,
+		unsigned int *lfc_mid_point_in_us,
+		unsigned int *inserted_frames,
+		unsigned int *inserted_duration_in_us)
+{
+	if (mod_freesync == NULL)
+		return;
+
+	if (vrr->supported) {
+		*v_total_min = vrr->adjust.v_total_min;
+		*v_total_max = vrr->adjust.v_total_max;
+		*event_triggers = 0;
+		*lfc_mid_point_in_us = vrr->btr.mid_point_in_us;
+		*inserted_frames = vrr->btr.frames_to_insert;
+		*inserted_duration_in_us = vrr->btr.inserted_duration_in_us;
+	}
+}
+
+unsigned long long mod_freesync_calc_nominal_field_rate(
+			const struct dc_stream_state *stream)
+{
+	unsigned long long nominal_field_rate_in_uhz = 0;
+	unsigned int total = stream->timing.h_total * stream->timing.v_total;
+
+	/* Calculate nominal field rate for stream, rounded up to nearest integer */
+	nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz;
+	nominal_field_rate_in_uhz *= 100000000ULL;
+
+	nominal_field_rate_in_uhz =	div_u64(nominal_field_rate_in_uhz, total);
+
+	return nominal_field_rate_in_uhz;
+}
+
+bool mod_freesync_is_valid_range(uint32_t min_refresh_cap_in_uhz,
+		uint32_t max_refresh_cap_in_uhz,
+		uint32_t nominal_field_rate_in_uhz) 
+{
+
+	/* Typically nominal refresh calculated can have some fractional part.
+	 * Allow for some rounding error of actual video timing by taking floor
+	 * of caps and request. Round the nominal refresh rate.
+	 *
+	 * Dividing will convert everything to units in Hz although input
+	 * variable name is in uHz!
+	 *
+	 * Also note, this takes care of rounding error on the nominal refresh
+	 * so by rounding error we only expect it to be off by a small amount,
+	 * such as < 0.1 Hz. i.e. 143.9xxx or 144.1xxx.
+	 *
+	 * Example 1. Caps    Min = 40 Hz, Max = 144 Hz
+	 *            Request Min = 40 Hz, Max = 144 Hz
+	 *                    Nominal = 143.5x Hz rounded to 144 Hz
+	 *            This function should allow this as valid request
+	 *
+	 * Example 2. Caps    Min = 40 Hz, Max = 144 Hz
+	 *            Request Min = 40 Hz, Max = 144 Hz
+	 *                    Nominal = 144.4x Hz rounded to 144 Hz
+	 *            This function should allow this as valid request
+	 *
+	 * Example 3. Caps    Min = 40 Hz, Max = 144 Hz
+	 *            Request Min = 40 Hz, Max = 144 Hz
+	 *                    Nominal = 120.xx Hz rounded to 120 Hz
+	 *            This function should return NOT valid since the requested
+	 *            max is greater than current timing's nominal
+	 *
+	 * Example 4. Caps    Min = 40 Hz, Max = 120 Hz
+	 *            Request Min = 40 Hz, Max = 120 Hz
+	 *                    Nominal = 144.xx Hz rounded to 144 Hz
+	 *            This function should return NOT valid since the nominal
+	 *            is greater than the capability's max refresh
+	 */
+	nominal_field_rate_in_uhz =
+			div_u64(nominal_field_rate_in_uhz + 500000, 1000000);
+	min_refresh_cap_in_uhz /= 1000000;
+	max_refresh_cap_in_uhz /= 1000000;
+
+	// Check nominal is within range
+	if (nominal_field_rate_in_uhz > max_refresh_cap_in_uhz ||
+		nominal_field_rate_in_uhz < min_refresh_cap_in_uhz)
+		return false;
+
+	// If nominal is less than max, limit the max allowed refresh rate
+	if (nominal_field_rate_in_uhz < max_refresh_cap_in_uhz)
+		max_refresh_cap_in_uhz = nominal_field_rate_in_uhz;
+
+	// Check min is within range
+	if (min_refresh_cap_in_uhz > max_refresh_cap_in_uhz)
+		return false;
+
+	// For variable range, check for at least 10 Hz range
+	if (nominal_field_rate_in_uhz - min_refresh_cap_in_uhz < 10)
+		return false;
+
+	return true;
+}
+