linux-kernel - [PATCH] drm/msm/adreno: fix a743 and a740 cx mem init

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Date: Wed, 26 Jun 2024 14:04:21 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Connor Abbott <cwabbott0@...il.com>
Cc: Rob Clark <robdclark@...omium.org>, linux-arm-msm@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH] drm/msm/adreno: fix a743 and a740 cx mem init

Disable the call to qcom_scm_gpu_init_regs() for a730 and a740
after init failures on the HDK8550 and HDK8450 platforms:
msm_dpu ae01000.display-controller: failed to load adreno gpu
msm_dpu ae01000.display-controller: failed to bind 3d00000.gpu (ops a3xx_ops [msm]): -5
msm_dpu ae01000.display-controller: adev bind failed: -5

While debugging, it happens the call to:
qcom_scm_gpu_init_regs(QCOM_SCM_GPU_ALWAYS_EN_REQ)
returns -5 and makes the gpu fail to initialize.

Remove the scm call since it's not done downstream either and
works fine without.

Fixes: 14b27d5df3ea ("drm/msm/a7xx: Initialize a750 "software fuse"")
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index c98cdb1e9326..3ba45b804983 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1741,14 +1741,9 @@ static int a7xx_cx_mem_init(struct a6xx_gpu *a6xx_gpu)
 					 REG_A7XX_CX_MISC_SW_FUSE_VALUE);
 		adreno_gpu->has_ray_tracing =
 			!!(fuse_val & A7XX_CX_MISC_SW_FUSE_VALUE_RAYTRACING);
-	} else {
-		if (adreno_is_a740(adreno_gpu)) {
-			/* Raytracing is always enabled on a740 */
-			adreno_gpu->has_ray_tracing = true;
-		}
-
-		if (qcom_scm_is_available())
-			return qcom_scm_gpu_init_regs(QCOM_SCM_GPU_ALWAYS_EN_REQ);
+	} else if (adreno_is_a740(adreno_gpu)) {
+		/* Raytracing is always enabled on a740 */
+		adreno_gpu->has_ray_tracing = true;
 	}
 
 	return 0;

---
base-commit: 62c97045b8f720c2eac807a5f38e26c9ed512371
change-id: 20240626-topic-sm8x50-upstream-fix-a730-a730-gpu-raytracing-init-46ac3f4cdd29

Best regards,
-- 
Neil Armstrong <neil.armstrong@...aro.org>