linux-kernel - [PATCH v2 0/2] drm/msm/dpu: use full scale alpha in generic code

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Message-Id: <20260112-dpu-rework-alpha-v2-0-d168785911d5@oss.qualcomm.com>
Date: Mon, 12 Jan 2026 05:23:29 +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>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jessica Zhang <jesszhan0024@...il.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH v2 0/2] drm/msm/dpu: use full scale alpha in generic code

Both _dpu_crtc_setup_blend_cfg() and setup_blend_config_alpha()
callbacks embed knowledge about platform's alpha range (8-bit or
10-bit). Make _dpu_crtc_setup_blend_cfg() use full 16-bit values for
alpha and reduce alpha only in DPU-specific callbacks.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v2:
- Changed fg/bg alpha args to use u16.
- Simplified combined alpha calculation by dropping useless bitmasks
  (Konrad)
- Link to v1: https://lore.kernel.org/r/20250814-dpu-rework-alpha-v1-0-b4baa4ffa8fe@oss.qualcomm.com

---
Dmitry Baryshkov (2):
      drm/msm/dpu: simplify bg_alpha selection
      drm/msm/dpu: use full scale alpha in _dpu_crtc_setup_blend_cfg()

 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  | 18 +++++++-----------
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.c | 21 +++++++++++++--------
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_lm.h |  2 +-
 3 files changed, 21 insertions(+), 20 deletions(-)
---
base-commit: 66691e272e40c91305f1704695e0cb340cd162ff
change-id: 20250814-dpu-rework-alpha-060ff6bf5185

Best regards,
-- 
With best wishes
Dmitry