6.6-stable review patch. If anyone has any objections, please let me know.
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From: Ville Syrjälä ville.syrjala@linux.intel.com
commit 6266f4a78131c795631440ea9c7b66cdfd399484 upstream.
We currently call intel_set_cdclk_post_plane_update() far too early. When pipes are active during the reprogramming the current spot only works for the cd2x divider update case, as that is synchronize to the pipe's vblank. Squashing and crawling are not synchronized in any way, so doing the programming while the pipes/planes are potentially still using the old hardware state could lead to underruns.
Move the post plane reprgramming to a spot where we know that the pipes/planes have switched over the new hardware state.
Cc: stable@vger.kernel.org Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20250218211913.27867-2-ville.s... Reviewed-by: Vinod Govindapillai vinod.govindapillai@intel.com (cherry picked from commit fb64f5568c0e0b5730733d70a012ae26b1a55815) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_display.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -7097,9 +7097,6 @@ static void intel_atomic_commit_tail(str /* Now enable the clocks, plane, pipe, and connectors that we set up. */ dev_priv->display.funcs.display->commit_modeset_enables(state);
- if (state->modeset) - intel_set_cdclk_post_plane_update(state); - intel_wait_for_vblank_workers(state);
/* FIXME: We should call drm_atomic_helper_commit_hw_done() here @@ -7178,6 +7175,8 @@ static void intel_atomic_commit_tail(str intel_verify_planes(state);
intel_sagv_post_plane_update(state); + if (state->modeset) + intel_set_cdclk_post_plane_update(state); intel_pmdemand_post_plane_update(state);
drm_atomic_helper_commit_hw_done(&state->base);