linux-kernel - [PATCH v2 0/3] drm/msm/dpu: Drop max_mixer_width and MAX_HDISPLAY

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Message-Id: <20260103-max-mixer-width-v2-0-ef5d3d246709@oss.qualcomm.com>
Date: Sat, 03 Jan 2026 15:45:03 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Xilin Wu <sophon@...xa.com>
Subject: [PATCH v2 0/3] drm/msm/dpu: Drop max_mixer_width and
 MAX_HDISPLAY_SPLIT

Currently, the DPU driver bases LM reservation off of the maximum
supported width for the layer mixer and an arbitrary MAX_HDISPLAY_SPLIT.
However, these limits are not hardware limits meaning that a single LM
can support higher resolutions.

Switch to basing LM reservation off of PINGPONG and DSC encoder hardware
limits.

---
Changes in v2:
- Dropped PP and DSC encoder width drop the catalog, they are now
  determined in the code by using the DPU programming
- Corrected DSC encoder width for DPUs < 8.x (2048 vs 2560)
- Link to v1: https://lore.kernel.org/r/20250514-max-mixer-width-v1-0-c8ba0d9bb858@oss.qualcomm.com

---
Jessica Zhang (3):
      drm/msm/dpu: Check mode against PINGPONG or DSC max width
      drm/msm/dpu: Filter writeback modes using writeback maxlinewidth
      drm/msm/dpu: Remove max_mixer_width from catalog

 .../drm/msm/disp/dpu1/catalog/dpu_10_0_sm8650.h    |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_12_0_sm8750.h    |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_12_2_glymur.h    |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_1_14_msm8937.h   |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_1_15_msm8917.h   |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_1_16_msm8953.h   |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_1_7_msm8996.h    |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h    |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_3_2_sdm660.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_3_3_sdm630.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_5_0_sm8150.h |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h    |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_5_2_sm7150.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_5_3_sm6150.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_5_4_sm6125.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_0_sm8250.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_3_sm6115.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_4_sm6350.h |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_6_5_qcm2290.h    |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_9_sm6375.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_7_0_sm8350.h |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h   |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_8_1_sm8450.h |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_8_4_sa8775p.h    |  1 -
 .../gpu/drm/msm/disp/dpu1/catalog/dpu_9_0_sm8550.h |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_9_1_sar2130p.h   |  1 -
 .../drm/msm/disp/dpu1/catalog/dpu_9_2_x1e80100.h   |  1 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c           | 44 ++++++++++++++++++----
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  9 ++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c      |  9 +----
 33 files changed, 45 insertions(+), 47 deletions(-)
---
base-commit: 19eee9de953679506fd24a2db2613e165c6fe801
change-id: 20250401-max-mixer-width-9c3c02c48cb7

Best regards,
-- 
With best wishes
Dmitry