Re: [REGRESSION] sc7180-trogdor-lazor image corruption regression for USB-C DP Alt Mode ([PATCH 0/2] Add param for the highest bank bit)

[Dmitry Baryshkov]

Hi Leonard,

On Sun, 18 Feb 2024 at 03:17, Leonard Lausen <leon...@lausen.nl> wrote:

Hi Connor,

unfortunately, your series https://patchwork.freedesktop.org/series/127529/ has 
introduced a regression for external displays connected through USB-C DP Alt 
Mode, at least on sc7180-trogdor-lazor devices. Do you think it's possible to  
fix this before the 6.8 release or would it be better to revert the series? I'm 
happy to help testing any fixes. The issue is also tracked at 
https://gitlab.freedesktop.org/drm/msm/-/issues/49.

Please check whether this quick fix works for you

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c 
b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index c9c55e2ea584..f097577a99ad 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1325,6 +1325,11 @@ static void a6xx_calc_ubwc_config(struct 
adreno_gpu *gpu)
 static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
 {
        struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+
+       /* a618 is using the hw default values */
+       if (adreno_is_a618(adreno_gpu))
+               return;
+
        /*
         * We subtract 13 from the highest bank bit (13 is the minimum value
         * allowed by hw) and write the lowest two bits of the remaining value


--
With best wishes
Dmitry