diff mbox series

[v4,06/14] drm/msm/a6xx: Remove both GBIF and RBBM GBIF halt on hw init

Message ID 20230223-topic-gmuwrapper-v4-6-e987eb79d03f@linaro.org
State New
Headers
Series GMU-less A6xx support (A610, A619_holi) |

Commit Message

Konrad Dybcio March 14, 2023, 3:28 p.m. UTC 
  Currently we're only deasserting REG_A6XX_RBBM_GBIF_HALT, but we also
need REG_A6XX_GBIF_HALT to be set to 0. For GMU-equipped GPUs this is
done in a6xx_bus_clear_pending_transactions(), but for the GMU-less
ones we have to do it *somewhere*. Unhalting both side by side sounds
like a good plan and it won't cause any issues if it's unnecessary.

Also, add a memory barrier to ensure it's gone through.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Dmitry Baryshkov March 28, 2023, 3:35 p.m. UTC | #1 
On 14/03/2023 17:28, Konrad Dybcio wrote:
> Currently we're only deasserting REG_A6XX_RBBM_GBIF_HALT, but we also
> need REG_A6XX_GBIF_HALT to be set to 0. For GMU-equipped GPUs this is
> done in a6xx_bus_clear_pending_transactions(), but for the GMU-less
> ones we have to do it *somewhere*. Unhalting both side by side sounds
> like a good plan and it won't cause any issues if it's unnecessary.
> 
> Also, add a memory barrier to ensure it's gone through.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index a90847a3379a..70e9bd21ba3b 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1015,8 +1015,12 @@  static int hw_init(struct msm_gpu *gpu)
 	}
 
 	/* Clear GBIF halt in case GX domain was not collapsed */
-	if (a6xx_has_gbif(adreno_gpu))
+	if (a6xx_has_gbif(adreno_gpu)) {
+		gpu_write(gpu, REG_A6XX_GBIF_HALT, 0);
 		gpu_write(gpu, REG_A6XX_RBBM_GBIF_HALT, 0);
+		/* Let's make extra sure that the GPU can access the memory.. */
+		mb();
+	}
 
 	gpu_write(gpu, REG_A6XX_RBBM_SECVID_TSB_CNTL, 0);