[PATCH v9 09/20] drm/msm/a6xx: Remove both GBIF and RBBM GBIF halt on hw init

From: Konrad Dybcio
Date: Thu Jun 15 2023 - 19:22:11 EST


Currently we're only deasserting REG_A6XX_RBBM_GBIF_HALT, but we also
need REG_A6XX_GBIF_HALT to be set to 0.

This is typically done automatically on successful GX collapse, but in
case that fails, we should take care of it.

Also, add a memory barrier to ensure it's gone through before jumping
to further initialization.

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

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index b627be3f6360..7e0d1dfcd993 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1111,8 +1111,12 @@ static int hw_init(struct msm_gpu *gpu)
a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);

/* 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);


--
2.41.0