linux-kernel - [PATCH v2 5/7] drm/msm: Fix a7xx debugbus read

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Message-ID: <20250729145729.10905-6-robin.clark@oss.qualcomm.com>
Date: Tue, 29 Jul 2025 07:57:22 -0700
From: Rob Clark <robin.clark@....qualcomm.com>
To: dri-devel@...ts.freedesktop.org
Cc: linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Connor Abbott <cwabbott0@...il.com>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 5/7] drm/msm: Fix a7xx debugbus read

The bitfield positions changed in a7xx.

v2: Don't open-code the bitfield building

Signed-off-by: Rob Clark <robin.clark@....qualcomm.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c   | 11 +++++++++--
 drivers/gpu/drm/msm/registers/adreno/a6xx.xml |  6 +++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index 173c14f215a7..8317e1107389 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -174,8 +174,15 @@ static int a6xx_crashdumper_run(struct msm_gpu *gpu,
 static int debugbus_read(struct msm_gpu *gpu, u32 block, u32 offset,
 		u32 *data)
 {
-	u32 reg = A6XX_DBGC_CFG_DBGBUS_SEL_D_PING_INDEX(offset) |
-		A6XX_DBGC_CFG_DBGBUS_SEL_D_PING_BLK_SEL(block);
+	u32 reg;
+
+	if (to_adreno_gpu(gpu)->info->family >= ADRENO_7XX_GEN1) {
+		reg = A7XX_DBGC_CFG_DBGBUS_SEL_D_PING_INDEX(offset) |
+			A7XX_DBGC_CFG_DBGBUS_SEL_D_PING_BLK_SEL(block);
+	} else {
+		reg = A6XX_DBGC_CFG_DBGBUS_SEL_D_PING_INDEX(offset) |
+			A6XX_DBGC_CFG_DBGBUS_SEL_D_PING_BLK_SEL(block);
+	}
 
 	gpu_write(gpu, REG_A6XX_DBGC_CFG_DBGBUS_SEL_A, reg);
 	gpu_write(gpu, REG_A6XX_DBGC_CFG_DBGBUS_SEL_B, reg);
diff --git a/drivers/gpu/drm/msm/registers/adreno/a6xx.xml b/drivers/gpu/drm/msm/registers/adreno/a6xx.xml
index d860fd94feae..7a32f6715752 100644
--- a/drivers/gpu/drm/msm/registers/adreno/a6xx.xml
+++ b/drivers/gpu/drm/msm/registers/adreno/a6xx.xml
@@ -594,10 +594,14 @@ by a particular renderpass/blit.
 	<reg32 offset="0x0600" name="DBGC_CFG_DBGBUS_SEL_A"/>
 	<reg32 offset="0x0601" name="DBGC_CFG_DBGBUS_SEL_B"/>
 	<reg32 offset="0x0602" name="DBGC_CFG_DBGBUS_SEL_C"/>
-	<reg32 offset="0x0603" name="DBGC_CFG_DBGBUS_SEL_D">
+	<reg32 offset="0x0603" name="DBGC_CFG_DBGBUS_SEL_D" variants="A6XX">
 		<bitfield high="7" low="0" name="PING_INDEX"/>
 		<bitfield high="15" low="8" name="PING_BLK_SEL"/>
 	</reg32>
+	<reg32 offset="0x0603" name="DBGC_CFG_DBGBUS_SEL_D" variants="A7XX-">
+		<bitfield high="7" low="0" name="PING_INDEX"/>
+		<bitfield high="24" low="16" name="PING_BLK_SEL"/>
+	</reg32>
 	<reg32 offset="0x0604" name="DBGC_CFG_DBGBUS_CNTLT">
 		<bitfield high="5" low="0" name="TRACEEN"/>
 		<bitfield high="14" low="12" name="GRANU"/>
-- 
2.50.1