From: Christian König <christian.koenig@amd.com>
Date: Sat, 19 Apr 2014 16:57:14 +0000 (+0200)
Subject: drm/radeon: use fixed PPL ref divider if needed
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=24315814239a3fdb306244c99bd076bc79db4ade;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

drm/radeon: use fixed PPL ref divider if needed

Signed-off-by: Christian König <christian.koenig@amd.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 2f7cbb901fb1..e6c3c5488259 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -880,7 +880,12 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
 		ref_div_min = pll->reference_div;
 	else
 		ref_div_min = pll->min_ref_div;
-	ref_div_max = pll->max_ref_div;
+
+	if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV &&
+	    pll->flags & RADEON_PLL_USE_REF_DIV)
+		ref_div_max = pll->reference_div;
+	else
+		ref_div_max = pll->max_ref_div;
 
 	/* determine allowed post divider range */
 	if (pll->flags & RADEON_PLL_USE_POST_DIV) {