linux-kernel - [PATCH] drm/msm/dpu: disable gamma correction unit on SC7180

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20251115-dpu-fix-gc-v1-1-0a4fd718208d@oss.qualcomm.com>
Date: Sat, 15 Nov 2025 05:08:08 +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,
        Federico Amedeo Izzo <federico@...o.pro>
Subject: [PATCH] drm/msm/dpu: disable gamma correction unit on SC7180

IGT reported test failures with Gamma correction block on SC7180.
Disable GC subblock on SC7180 until we trage the issue.

Cc: Federico Amedeo Izzo <federico@...o.pro>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Most likely I will squash this into the GC patch
---
 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h | 2 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c         | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h
index c990ba3b5db02d65934179d5ad42bd740f6944b2..b6415adcea10126fb6bb29d60a9d4159052a61ba 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h
@@ -103,7 +103,7 @@ static const struct dpu_dspp_cfg sc7180_dspp[] = {
 	{
 		.name = "dspp_0", .id = DSPP_0,
 		.base = 0x54000, .len = 0x1800,
-		.sblk = &sdm845_dspp_sblk,
+		.sblk = &sc7180_dspp_sblk,
 	},
 };
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index 23bb39b471b71e3f313321ad1c7a6bd4d2159019..bfd34368a03641651530d9c564a74d2e9398f656 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
@@ -389,6 +389,15 @@ static const struct dpu_dspp_sub_blks sdm845_dspp_sblk = {
 		.len = 0x90, .version = 0x40000},
 };
 
+/*
+ * Some of Gamma-related IGT tests fail on SC7180. Disable GC until we triage
+ * those failures.
+ */
+static const struct dpu_dspp_sub_blks sc7180_dspp_sblk = {
+	.pcc = {.name = "pcc", .base = 0x1700,
+		.len = 0x90, .version = 0x40000},
+};
+
 static const struct dpu_dspp_sub_blks sm8750_dspp_sblk = {
 	.pcc = {.name = "pcc", .base = 0x1700,
 		.len = 0x90, .version = 0x60000},

---
base-commit: e2f085ab8636fae2ebe0adf42071e7558234cd7b
change-id: 20251115-dpu-fix-gc-931feac75705

Best regards,
-- 
With best wishes
Dmitry