From 4b49f902ec6f2bb382cbbf489870573f4b43371e Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@chromium.org>
Date: Wed, 2 Sep 2020 11:11:58 -0700
Subject: [PATCH] drm/msm/a6xx: make GPUs SMMU context bank available in it's
aperture.
This is a workaround for old cheza firmware
v2:
- add ifdef for ARM64 since the change isn't relevant outside of it
Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 411b7a5fa2f3..1810b2395f14 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1197,6 +1197,14 @@ static int hw_init(struct msm_gpu *gpu)
if (!a6xx_idle(gpu, gpu->rb[0]))
return -EINVAL;
} else if (ret == -ENODEV) {
+#if defined(CONFIG_ARM64)
+ static bool first = true;
+ if (first) {
+ void __iomem *reg = ioremap(0x05060000, 0x1000);
+ writeq(0x48000, reg); /* offset of cb0 from gpu's base */
+ iounmap(reg);
+ }
+#endif
/*
* This device does not use zap shader (but print a warning
* just in case someone got their dt wrong.. hopefully they
--
GitLab