linux-kernel - [PATCH 1/6] drm/msm/dpu: Fix allocation of RGB SSPPs without scaling

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Message-Id: <20251017-b4-dpu-fixes-v1-1-40ce5993eeb6@gmail.com>
Date: Fri, 17 Oct 2025 19:58:35 +0000
From: Vladimir Lypak <vladimir.lypak@...il.com>
To: Rob Clark <robin.clark@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, 
 Abhinav Kumar <abhinav.kumar@...ux.dev>, 
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 
 Kalyan Thota <quic_kalyant@...cinc.com>, 
 Vinod Polimera <quic_vpolimer@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Barnabás Czémán <barnabas.czeman@...nlining.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Vladimir Lypak <vladimir.lypak@...il.com>
Subject: [PATCH 1/6] drm/msm/dpu: Fix allocation of RGB SSPPs without
 scaling

Due to condition in dpu_rm_reserve_sspp, RGB SSPPs are only tried when
scaling is requested, which prevents those SSPPs from being reserved if
we don't need scaling at all. Instead we should check if YUV support is
requested, since scaling on RGB SSPPs is optional and is not implemented
in driver yet.

Fixes: 774bcfb73176 ("drm/msm/dpu: add support for virtual planes")
Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 2c77c74fac0fda649da8ce19b7b3c6cb32b9535c..d9c3b0a1d0914a47f86ac9a854fbcede021e73cb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -842,7 +842,7 @@ struct dpu_hw_sspp *dpu_rm_reserve_sspp(struct dpu_rm *rm,
 
 	if (!reqs->scale && !reqs->yuv)
 		hw_sspp = dpu_rm_try_sspp(rm, global_state, crtc, reqs, SSPP_TYPE_DMA);
-	if (!hw_sspp && reqs->scale)
+	if (!hw_sspp && !reqs->yuv)
 		hw_sspp = dpu_rm_try_sspp(rm, global_state, crtc, reqs, SSPP_TYPE_RGB);
 	if (!hw_sspp)
 		hw_sspp = dpu_rm_try_sspp(rm, global_state, crtc, reqs, SSPP_TYPE_VIG);

-- 
2.51.0