Re: [PATCH v3 6/8] drm/msm/dpu: add support for MDP_TOP blackhole

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On 04/11/2022 16:58, Konrad Dybcio wrote:

On 04/11/2022 14:03, Dmitry Baryshkov wrote:
On sm8450 a register block was removed from MDP TOP. Accessing it during
snapshotting results in NoC errors / immediate reboot. Skip accessing
these registers during snapshot.

Must have been fun to debug..



Tested-by: Vinod Koul <vkoul@xxxxxxxxxx>
Reviewed-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h |  1 +
  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c        | 11 +++++++++--
  2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index 38aa38ab1568..4730f8268f2a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -92,6 +92,7 @@ enum {
      DPU_MDP_UBWC_1_0,
      DPU_MDP_UBWC_1_5,
      DPU_MDP_AUDIO_SELECT,
+    DPU_MDP_PERIPH_0_REMOVED,
      DPU_MDP_MAX
  };
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index f3660cd14f4f..95d8765c1c53 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -927,8 +927,15 @@ static void dpu_kms_mdp_snapshot(struct msm_disp_state *disp_state, struct msm_k
          msm_disp_snapshot_add_block(disp_state, cat->wb[i].len,
                  dpu_kms->mmio + cat->wb[i].base, "wb_%d", i);
-    msm_disp_snapshot_add_block(disp_state, cat->mdp[0].len,
-            dpu_kms->mmio + cat->mdp[0].base, "top");
+    if (dpu_kms->hw_mdp->caps->features & BIT(DPU_MDP_PERIPH_0_REMOVED)) {
+        msm_disp_snapshot_add_block(disp_state, 0x380,
+                dpu_kms->mmio + cat->mdp[0].base, "top");
+        msm_disp_snapshot_add_block(disp_state, cat->mdp[0].len - 0x3a8,
+                dpu_kms->mmio + cat->mdp[0].base + 0x3a8, "top_2");

Are these values expected to stay the same on different new-gen SoCs? Maybe it would

be worth making it dynamic.

I do not want to overcomplicate this. Let's make it dynamic once there is need for that. For now I expect this will be static.



Konrad

+    } else {
+        msm_disp_snapshot_add_block(disp_state, cat->mdp[0].len,
+                dpu_kms->mmio + cat->mdp[0].base, "top");
+    }
      pm_runtime_put_sync(&dpu_kms->pdev->dev);
  }

--
With best wishes
Dmitry




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