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

From: Dmitry Baryshkov

Date: Thu Jan 15 2026 - 15:05:42 EST


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@xxxxxxxxxxxxxxxx>
---
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(-)
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base-commit: b775e489bec70895b7ef6b66927886bbac79598f
change-id: 20260115-dpu-fix-dspp-803dee634153

Best regards,
--
With best wishes
Dmitry