From: Christian König christian.koenig@amd.com
Letting post and refernce divider get to big is bad for signal stability.
v2: increase the limit to 210
Signed-off-by: Christian König christian.koenig@amd.com --- 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..2f42912 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(210 / post_div, ref_div_max); + /* get matching reference and feedback divider */ ref_div = max(den / post_div, 1u); fb_div = nom;
On Fri, Apr 11, 2014 at 11:24 AM, Christian König deathsimple@vodafone.de wrote:
From: Christian König christian.koenig@amd.com
Letting post and refernce divider get to big is bad for signal stability.
v2: increase the limit to 210
Maybe mention the bug number?
Signed-off-by: Christian König christian.koenig@amd.com
Reviewed-by: Alex Deucher alexander.deucher@amd.com
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..2f42912 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(210 / post_div, ref_div_max);/* get matching reference and feedback divider */ ref_div = max(den / post_div, 1u); fb_div = nom;-- 1.9.1
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