[PATCH] drm/amdgpu: don't read DF register for SRIOV

[Koenig, Christian]

Hi Yintian,

sorry I have not the slightest idea how this part of the hw works. Maybe 
try to explain more what the DF register is actually doing in the commit 
message. I suspect that it is only about detecting which VRAM connection 
is used, but I'm not 100% sure.

Regards,
Christian.

Am 17.05.19 um 04:38 schrieb Tao, Yintian:
> Ping...
>
> Hi Christian and Alex
>
>
> Can you help review this? Thanks in advance.
>
>
> Best Regards
> Yintian Tao
>
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Yintian Tao
> Sent: Thursday, May 16, 2019 8:11 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Liu, Monk <Monk.Liu at amd.com>; Tao, Yintian <Yintian.Tao at amd.com>
> Subject: [PATCH] drm/amdgpu: don't read DF register for SRIOV
>
> [CAUTION: External Email]
>
> Under SRIOV, reading DF register has chance to lead to AER error in host side, just skip reading it.
>
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> Signed-off-by: Yintian Tao <yttao at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 2 +-
>   1 file changed, 1 insertion(+), 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 a417763..b5bf9ed 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -837,7 +837,7 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
>
>          if (amdgpu_emu_mode != 1)
>                  adev->gmc.vram_width = amdgpu_atomfirmware_get_vram_width(adev);
> -       if (!adev->gmc.vram_width) {
> +       if (!adev->gmc.vram_width && !amdgpu_sriov_vf(adev)) {
>                  /* hbm memory channel size */
>                  if (adev->flags & AMD_IS_APU)
>                          chansize = 64;
> --
> 2.7.4
>
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