From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 19 Apr 2012 14:48:38 +0000 (-0400)
Subject: drm/radeon/kms: use frac fb div on APUs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=37d4174d2d252c37dcb3d88cafae488542087848;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

drm/radeon/kms: use frac fb div on APUs

Seems to be more stable on certain monitors.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=48880

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index b5ff1f7b6f7e..c5c31e091a92 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -575,6 +575,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 
 		if (rdev->family < CHIP_RV770)
 			pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
+		/* use frac fb div on APUs */
+		if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))
+			pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 	} else {
 		pll->flags |= RADEON_PLL_LEGACY;