diff options
| author | Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> | 2021-06-08 13:37:18 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-06-18 17:06:43 -0400 |
| commit | 5fd953a3f6e25859ad1633ccd9f6320f1067a46d (patch) | |
| tree | 397da23208b66332c9040e084694f1271fe73255 /drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | |
| parent | 26c0504ad3e0fdee808dbf458dd31d7c12469ef9 (diff) | |
drm/amd/display: Add Freesync video documentation
Recently, we added support for an experimental feature named Freesync
video; for more details on that, refer to:
commit 6f59f229f8ed ("drm/amd/display: Skip modeset for front porch change")
commit d10cd527f5e5 ("drm/amd/display: Add freesync video modes based on preferred modes")
commit 0eb1af2e8205 ("drm/amd/display: Add module parameter for freesync video mode")
Nevertheless, we did not document it in detail in our driver. This
commit introduces a kernel-doc and expands the module parameter
description.
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index c080ba15ae77..6f30c525caac 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -837,8 +837,23 @@ module_param_named(tmz, amdgpu_tmz, int, 0444); /** * DOC: freesync_video (uint) - * Enabled the optimization to adjust front porch timing to achieve seamless mode change experience - * when setting a freesync supported mode for which full modeset is not needed. + * Enable the optimization to adjust front porch timing to achieve seamless + * mode change experience when setting a freesync supported mode for which full + * modeset is not needed. + * + * The Display Core will add a set of modes derived from the base FreeSync + * video mode into the corresponding connector's mode list based on commonly + * used refresh rates and VRR range of the connected display, when users enable + * this feature. From the userspace perspective, they can see a seamless mode + * change experience when the change between different refresh rates under the + * same resolution. Additionally, userspace applications such as Video playback + * can read this modeset list and change the refresh rate based on the video + * frame rate. Finally, the userspace can also derive an appropriate mode for a + * particular refresh rate based on the FreeSync Mode and add it to the + * connector's mode list. + * + * Note: This is an experimental feature. + * * The default value: 0 (off). */ MODULE_PARM_DESC( |