| From | Ben Hutchings <> | Date | Sat, 09 Sep 2017 22:47:14 +0100 | Subject | [PATCH 3.16 091/233] drm/radeon/ci: disable mclk switching for high refresh rates (v2) |
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3.16.48-rc1 review patch. If anyone has any objections, please let me know.
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From: Alex Deucher <alexander.deucher@amd.com>
commit 58d7e3e427db1bd68f33025519a9468140280a75 upstream.
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
Acked-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/gpu/drm/radeon/ci_dpm.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/radeon/ci_dpm.c +++ b/drivers/gpu/drm/radeon/ci_dpm.c @@ -733,6 +733,12 @@ bool ci_dpm_vblank_too_short(struct rade 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
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