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Commit 41167828 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon: use frac fb div on RS780/RS880 

Monitors seem to prefer it.  Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=37696



Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent bf05d998

drivers/gpu/drm/radeon/atombios_crtc.c

+3 −0
Original line number Diff line number Diff line
@@ -557,6 +557,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc, 
		/* use frac fb div on APUs */

		if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))

			radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;

		/* use frac fb div on RS780/RS880 */

		if ((rdev->family == CHIP_RS780) || (rdev->family == CHIP_RS880))

			radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;

		if (ASIC_IS_DCE32(rdev) && mode->clock > 165000)

			radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;

	} else {