diff --git a/packages/linux/patches/3.14/linux-997-drm-radeon-rework-finding-display-PLL-numbers-fix-range.patch b/packages/linux/patches/3.14/linux-997-drm-radeon-rework-finding-display-PLL-numbers-fix-range.patch new file mode 100644 index 0000000000..5afc02005b --- /dev/null +++ b/packages/linux/patches/3.14/linux-997-drm-radeon-rework-finding-display-PLL-numbers-fix-range.patch @@ -0,0 +1,31 @@ +From 146b3e334cdbfa4bf5b5d3a4162f7b677356773d Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Christian=20K=C3=B6nig?= +Date: Fri, 4 Apr 2014 13:45:42 +0200 +Subject: [PATCH] drm/radeon: apply more strict limits for PLL params +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Letting post and refernce divider get to big is bad for signal stability. + +Signed-off-by: Christian König +--- + drivers/gpu/drm/radeon/radeon_display.c | 3 +++ + 1 file changed, 3 insertions(+) + +diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c +index 386cfa4..d68863e 100644 +--- a/drivers/gpu/drm/radeon/radeon_display.c ++++ b/drivers/gpu/drm/radeon/radeon_display.c +@@ -937,6 +937,9 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll, + } + post_div = post_div_best; + ++ /* limit reference * post divider to a maximum */ ++ ref_div_max = min(100 / post_div, ref_div_max); ++ + /* get matching reference and feedback divider */ + ref_div = max(den / post_div, 1u); + fb_div = nom; +-- +1.9.1