From: Alex Deucher Date: Tue, 7 Jan 2014 18:51:51 +0000 (-0500) Subject: drm/radeon/dpm: disable mclk switching on desktop RV770 X-Git-Tag: submit/tizen_common/20140905.094502~802 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=776c716b30696438465865697bba1ad8ba479e99;p=sdk%2Femulator%2Femulator-kernel.git drm/radeon/dpm: disable mclk switching on desktop RV770 commit 8097d94116d0c17e774ba4c8256e774018dc2a46 upstream. Mclk switching doesn't seem to work reliably on these cards. Most RV770 boards specify the same mclk for all performance levels anyway so in most cases, this has no affect. Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73067 Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/radeon/rv770_dpm.c b/drivers/gpu/drm/radeon/rv770_dpm.c index 374499db20c7..a239b30aaf9d 100644 --- a/drivers/gpu/drm/radeon/rv770_dpm.c +++ b/drivers/gpu/drm/radeon/rv770_dpm.c @@ -2531,6 +2531,12 @@ bool rv770_dpm_vblank_too_short(struct radeon_device *rdev) (rdev->pdev->subsystem_device == 0x1c42)) switch_limit = 200; + /* RV770 */ + /* mclk switching doesn't seem to work reliably on desktop RV770s */ + if ((rdev->family == CHIP_RV770) && + !(rdev->flags & RADEON_IS_MOBILITY)) + switch_limit = 0xffffffff; /* disable mclk switching */ + if (vblank_time < switch_limit) return true; else