[PATCH 2/6] drm/msm/a6xx: Skip empty protection ranges entries

[Konrad Dybcio]

Some specific SKUs leave certain protection range registers empty.
Allow for that behavior.

Signed-off-by: Konrad Dybcio <konrad.dyb...@linaro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c 
b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index deed42675fe2..8707e8b6ac7e 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -778,8 +778,11 @@ static void a6xx_set_cp_protect(struct msm_gpu *gpu)
         */
        gpu_write(gpu, REG_A6XX_CP_PROTECT_CNTL, BIT(0) | BIT(1) | BIT(3));
 
-       for (i = 0; i < count - 1; i++)
-               gpu_write(gpu, REG_A6XX_CP_PROTECT(i), regs[i]);
+       for (i = 0; i < count - 1; i++) {
+               /* Intentionally skip writing to some registers */
+               if (regs[i])
+                       gpu_write(gpu, REG_A6XX_CP_PROTECT(i), regs[i]);
+       }
        /* last CP_PROTECT to have "infinite" length on the last entry */
        gpu_write(gpu, REG_A6XX_CP_PROTECT(count_max - 1), regs[i]);
 }

-- 
2.40.1