On Thu, Jan 06, 2022 at 04:39:01AM +0800, Harry Wentland wrote:
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
>
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
>
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
>
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
>
> Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Look good for me, this patch needs to backport it to stable kernel (CC
stable mailing list).
Reviewed-by: Huang Rui <ray.huang@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 57f2729a7bd0..8367ecf61af1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -72,6 +72,9 @@
> #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0 0x049d
> #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX 2
>
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION 0x05ea
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_BASE_IDX 2
> +
>
> static const char *gfxhub_client_ids[] = {
> "CB",
> @@ -1142,7 +1145,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
> switch (adev->ip_versions[DCE_HWIP][0]) {
> case IP_VERSION(1, 0, 0):
> case IP_VERSION(1, 0, 1):
> - case IP_VERSION(2, 1, 0):
> viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
> size = (REG_GET_FIELD(viewport,
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> @@ -1150,6 +1152,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> 4);
> break;
> + case IP_VERSION(2, 1, 0):
> + viewport = RREG32_SOC15(DCE, 0, DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
> + size = (REG_GET_FIELD(viewport,
> + HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> + REG_GET_FIELD(viewport,
> + HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> + 4);
> + break;
> default:
> viewport = RREG32_SOC15(DCE, 0, mmSCL0_VIEWPORT_SIZE);
> size = (REG_GET_FIELD(viewport, SCL0_VIEWPORT_SIZE, VIEWPORT_HEIGHT) *
> --
> 2.34.1
>
