Icenowy Zheng and Huacai Chen 278be83601
LoongArch: Disable WUC for pgprot_writecombine() like ioremap_wc() ...
Currently the code disables WUC only disables it for ioremap_wc(), which
is only used when mapping writecombine pages like ioremap() (mapped to
the kernel space). But for VRAM mapped in TTM/GEM, it is mapped with a
crafted pgprot by the pgprot_writecombine() function, in which case WUC
isn't disabled now.
Disable WUC for pgprot_writecombine() (fallback to SUC) if needed, like
ioremap_wc().
This improves the AMDGPU driver's stability (solves some misrendering)
on Loongson-3A5000/3A6000 machines.
Signed-off-by: Icenowy Zheng <uwu@icenowy.me >
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn >
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Icenowy ZhengandHuacai Chen
278be83601