diff options
author | Alex Deucher <alexander.deucher@amd.com> | 2017-05-11 13:14:14 -0400 |
---|---|---|
committer | Sasha Levin <alexander.levin@verizon.com> | 2017-06-25 00:25:35 -0400 |
commit | c7dbf874d6b55ba723afcd745e3186a5140c3bff (patch) | |
tree | 9c0fb996346f81f9423a87727c4084658a4b0849 /drivers/gpu | |
parent | 9fcaaa87e08c0f0917318a6cd96d591926f2304e (diff) |
drm/radeon/ci: disable mclk switching for high refresh rates (v2)
[ Upstream commit 58d7e3e427db1bd68f33025519a9468140280a75 ]
Even if the vblank period would allow it, it still seems to
be problematic on some cards.
v2: fix logic inversion (Nils)
bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868
Cc: stable@vger.kernel.org
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/radeon/ci_dpm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c index 4a09947be244..3c32f095a873 100644 --- a/drivers/gpu/drm/radeon/ci_dpm.c +++ b/drivers/gpu/drm/radeon/ci_dpm.c @@ -776,6 +776,12 @@ bool ci_dpm_vblank_too_short(struct radeon_device *rdev) u32 vblank_time = r600_dpm_get_vblank_time(rdev); u32 switch_limit = pi->mem_gddr5 ? 450 : 300; + /* disable mclk switching if the refresh is >120Hz, even if the + * blanking period would allow it + */ + if (r600_dpm_get_vrefresh(rdev) > 120) + return true; + if (vblank_time < switch_limit) return true; else |