drm/amd/display: Add freesync video modes based on preferred modes

[Why]
While possible for userspace to create and add custom mode based off the
optimized mode for the connected display which differs only in front porch
timing, this patch set adds a list of common video modes in advance.

The list of common video refresh rates is small, well known and the optimized
mode has specific requirements to be able to enable HW frame doubling and
tripling so it makes most sense to create the modes that video players will need
in advance. The optimized mode matches the preferred mode resolution but has the
highest refresh rate available to enable the largest front porch extension.

[How]
Find the optimized mode and store it on the connector so we can check it
later during our optimized modeset.

Prepopulate the mode list with a list of common video mades based on the
optimized mode (but with a longer front porch) if the panel doesn't support a
variant of the mode natively.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index bbf68cb6cfec..6792de32c98c 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -440,6 +440,8 @@ struct amdgpu_dm_connector {
 #endif
 	bool force_yuv420_output;
 	struct dsc_preferred_settings dsc_settings;
+	/* Cached display modes */
+	struct drm_display_mode freesync_vid_base;
 };
 
 #define to_amdgpu_dm_connector(x) container_of(x, struct amdgpu_dm_connector, base)