From: Alex Deucher Date: Thu, 11 May 2017 17:14:14 +0000 (-0400) Subject: drm/radeon/ci: disable mclk switching for high refresh rates (v2) X-Git-Tag: C0P2-H0.0--20200415~8072 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=a844f8d2a564d00d0043487d860a82d303b1a313;p=linux.git drm/radeon/ci: disable mclk switching for high refresh rates (v2) commit ab03d9fe508f4e2914a8f4a9eef1b21051cacd0f 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 Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c index ea36dc4dd5d2..24810492d2c1 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; + /* disable mclk switching if the refresh is >120Hz, even if the * blanking period would allow it */