[ Dropping stable@ (fixes with Cc: stable are picked up for stable
branches once they land in Linus' tree, there's no point sending them to
stable@ during review), adding dri-devel ]
On 2018-04-18 10:26 PM, Harry Wentland wrote:
> The below commit
>
> "drm/atomic: Try to preserve the crtc enabled state in drm_atomic_remove_fb, v2"
>
> introduces a slight behavioral change to rmfb. Instead of disabling a crtc
> when the primary plane is disabled, it now preserves it.
>
> Since DC is currently not equipped to handle this we need to fail such
> a commit, otherwise we might see a corrupted screen.
How does the caller react to failing such a commit?
> This is based on Shirish's previous approach but avoids adding all
> planes to the new atomic state which leads to a full update in DC for
> any commit, and is not what we intend.
>
> Theoretically DM should be able to deal with states with fully populated planes,
> even for simple updates, such as cursor updates. This should still be
> addressed in the future.
>
> Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 6f92a19bebd6..0bdc6b484bad 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4683,6 +4683,7 @@ static int dm_update_crtcs_state(struct amdgpu_display_manager *dm,
> struct amdgpu_dm_connector *aconnector = NULL;
> struct drm_connector_state *new_con_state = NULL;
> struct dm_connector_state *dm_conn_state = NULL;
> + struct drm_plane_state *new_plane_state = NULL;
>
> new_stream = NULL;
>
> @@ -4690,6 +4691,13 @@ static int dm_update_crtcs_state(struct amdgpu_display_manager *dm,
> dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
> acrtc = to_amdgpu_crtc(crtc);
>
> + new_plane_state = drm_atomic_get_new_plane_state(state, new_crtc_state->crtc->primary);
> +
> + if (new_crtc_state->enable && new_plane_state && !new_plane_state->fb) {
> + ret = -EINVAL;
> + goto fail;
> + }
> +
> aconnector = amdgpu_dm_find_first_crtc_matching_connector(state, crtc);
>
> /* TODO This hack should go away */
> @@ -4894,7 +4902,7 @@ static int dm_update_planes_state(struct dc *dc,
> if (!dm_old_crtc_state->stream)
> continue;
>
> - DRM_DEBUG_DRIVER("Disabling DRM plane: %d on DRM crtc %d\n",
> + DRM_DEBUG_ATOMIC("Disabling DRM plane: %d on DRM crtc %d\n",
> plane->base.id, old_plane_crtc->base.id);
>
> if (!dc_remove_plane_from_context(
>
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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