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| author |   Christian König <christian.koenig@amd.com> | 2014-04-04 13:45:42 +0200 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2014-04-17 13:59:46 +0200 |
| commit | 5fb9cc4d8b1639b9a7487c1ee7b2b0c52877327d (patch) | |
| tree | 16b573a64725153bf6202164f383012c4da2d5f8 /drivers/gpu | |
| parent | drm/radeon: update CI DPM powertune settings (diff) | |
| download | linux-dev-5fb9cc4d8b1639b9a7487c1ee7b2b0c52877327d.tar.xz linux-dev-5fb9cc4d8b1639b9a7487c1ee7b2b0c52877327d.zip | |
drm/radeon: apply more strict limits for PLL params v2
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_display.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index 386cfa4c194d..2f42912031ac 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; |