This is a note to let you know that I've just added the patch titled
drm/msm/dpu: Don't always set merge_3d pending flush
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-dpu-don-t-always-set-merge_3d-pending-flush.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 75c1e2c7f5ac095af5517d27abbc25991d05891c
Author: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
Date: Wed Oct 9 20:41:13 2024 -0700
drm/msm/dpu: Don't always set merge_3d pending flush
[ Upstream commit 40dad89cb86ce824f2080441b2a6b7aedf695329 ]
Don't set the merge_3d pending flush bits if the mode_3d is
BLEND_3D_NONE.
Always flushing merge_3d can cause timeout issues when there are
multiple commits with concurrent writeback enabled.
This is because the video phys enc waits for the hw_ctl flush register
to be completely cleared [1] in its wait_for_commit_done(), but the WB
encoder always sets the merge_3d pending flush during each commit
regardless of if the merge_3d is actually active.
This means that the hw_ctl flush register will never be 0 when there are
multiple CWB commits and the video phys enc will hit vblank timeout
errors after the first CWB commit.
[1] commit fe9df3f50c39 ("drm/msm/dpu: add real wait_for_commit_done()")
Fixes: 3e79527a33a8 ("drm/msm/dpu: enable merge_3d support on sm8150/sm8250")
Fixes: d7d0e73f7de3 ("drm/msm/dpu: introduce the dpu_encoder_phys_* for writeback")
Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/619092/
Link: https://lore.kernel.org/r/20241009-mode3d-fix-v1-1-c0258354fadc@xxxxxxxxxxx
Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index ba8878d21cf0e..8864ace938e03 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -440,10 +440,12 @@ static void dpu_encoder_phys_vid_enable(struct dpu_encoder_phys *phys_enc)
struct dpu_hw_ctl *ctl;
const struct msm_format *fmt;
u32 fmt_fourcc;
+ u32 mode_3d;
ctl = phys_enc->hw_ctl;
fmt_fourcc = dpu_encoder_get_drm_fmt(phys_enc);
fmt = mdp_get_format(&phys_enc->dpu_kms->base, fmt_fourcc, 0);
+ mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
DPU_DEBUG_VIDENC(phys_enc, "\n");
@@ -466,7 +468,8 @@ static void dpu_encoder_phys_vid_enable(struct dpu_encoder_phys *phys_enc)
goto skip_flush;
ctl->ops.update_pending_flush_intf(ctl, phys_enc->hw_intf->idx);
- if (ctl->ops.update_pending_flush_merge_3d && phys_enc->hw_pp->merge_3d)
+ if (mode_3d && ctl->ops.update_pending_flush_merge_3d &&
+ phys_enc->hw_pp->merge_3d)
ctl->ops.update_pending_flush_merge_3d(ctl, phys_enc->hw_pp->merge_3d->idx);
if (ctl->ops.update_pending_flush_cdm && phys_enc->hw_cdm)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
index 882c717859cec..07035ab77b792 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
@@ -275,6 +275,7 @@ static void _dpu_encoder_phys_wb_update_flush(struct dpu_encoder_phys *phys_enc)
struct dpu_hw_pingpong *hw_pp;
struct dpu_hw_cdm *hw_cdm;
u32 pending_flush = 0;
+ u32 mode_3d;
if (!phys_enc)
return;
@@ -283,6 +284,7 @@ static void _dpu_encoder_phys_wb_update_flush(struct dpu_encoder_phys *phys_enc)
hw_pp = phys_enc->hw_pp;
hw_ctl = phys_enc->hw_ctl;
hw_cdm = phys_enc->hw_cdm;
+ mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
DPU_DEBUG("[wb:%d]\n", hw_wb->idx - WB_0);
@@ -294,7 +296,8 @@ static void _dpu_encoder_phys_wb_update_flush(struct dpu_encoder_phys *phys_enc)
if (hw_ctl->ops.update_pending_flush_wb)
hw_ctl->ops.update_pending_flush_wb(hw_ctl, hw_wb->idx);
- if (hw_ctl->ops.update_pending_flush_merge_3d && hw_pp && hw_pp->merge_3d)
+ if (mode_3d && hw_ctl->ops.update_pending_flush_merge_3d &&
+ hw_pp && hw_pp->merge_3d)
hw_ctl->ops.update_pending_flush_merge_3d(hw_ctl,
hw_pp->merge_3d->idx);
