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| Started by | Ben Hutchings <ben@decadent.org.uk> |
|---|---|
| First post | 2017-09-10 01:50 +0200 |
| Last post | 2017-09-10 01:50 +0200 |
| Articles | 1 — 1 participant |
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[PATCH 3.16 091/233] drm/radeon/ci: disable mclk switching for high refresh rates (v2) Ben Hutchings <ben@decadent.org.uk> - 2017-09-10 01:50 +0200
| From | Ben Hutchings <ben@decadent.org.uk> |
|---|---|
| Date | 2017-09-10 01:50 +0200 |
| Subject | [PATCH 3.16 091/233] drm/radeon/ci: disable mclk switching for high refresh rates (v2) |
| Message-ID | <unXFD-43x-15@gated-at.bofh.it> |
3.16.48-rc1 review patch. If anyone has any objections, please let me know. ------------------ 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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