linux-kernel - [PATCH 0/2] drm/msm/dpu: improve LM allocation

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Message-Id: <20260115-dpu-fix-dspp-v1-0-b73152c147b3@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 22:05:37 +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
Subject: [PATCH 0/2] drm/msm/dpu: improve LM allocation

Not all Line Mixers have corresponding DSPP blocks, which are necessary
for CTM or Gamma Correction. Currently it is possible for CTM-less CRTCs
to get a grip of DSPP-enabled LMs, making it impossible to use CTM (or
GC, once enabled) for other CRTCs. Make sure that RM allocates simpler
LMs first, leaving LMs with attached DSPP for the CRTCs which need them.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Dmitry Baryshkov (2):
      drm/msm/dpu: correct error messages in RM
      drm/msm/dpu: try reserving the DSPP-less LM first

 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 72 ++++++++++++++++++++++------------
 1 file changed, 47 insertions(+), 25 deletions(-)
---
base-commit: b775e489bec70895b7ef6b66927886bbac79598f
change-id: 20260115-dpu-fix-dspp-803dee634153

Best regards,
-- 
With best wishes
Dmitry