> -----Original Message----- > From: Huang Rui [mailto:ray.huang at amd.com] > Sent: Monday, June 26, 2017 8:18 AM > To: amd-gfx at lists.freedesktop.org; Deucher, Alexander; Koenig, Christian > Cc: Wang, Ken; Qiao, Joe(Markham); Jiang, Sonny; Huan, Alvin; Huang, Ray > Subject: [PATCH v2] drm/amdgpu: fix solid screen and hard hang when 2k + > 4k display connected with DP > > Signed-off-by: Huang Rui <ray.huang at amd.com> Acked-by: Alex Deucher <alexander.deucher at amd.com> > --- > > V1 -> V2: > - Add READ_ONCE to avoid complier might cause to read as previous fence > value. > > I will refine fence checking with fence interface at amdgpu_fence.c after S3 > stress issue completed as Christian's suggestion. > > Thanks, > Ray > > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c > b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c > index 5bed483..af3c87b 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c > @@ -130,7 +130,7 @@ psp_cmd_submit_buf(struct psp_context *psp, > ret = psp_cmd_submit(psp, ucode, cmd_buf_mc_addr, > fence_mc_addr, index); > > - while (*((unsigned int *)psp->fence_buf) != index) { > + while (READ_ONCE(*((unsigned int *)psp->fence_buf)) < index) { > msleep(1); > } > > -- > 2.7.4
