diff options
| author | Christian König <christian.koenig@amd.com> | 2015-01-29 16:01:03 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-11 15:00:54 +0800 |
| commit | 7530584f8c7d2ded28dd72e0dbf17c2bff085107 (patch) | |
| tree | c4fd63f93d362232149b2aa81a3d57d7c30154c3 | |
| parent | 2a1398b3317fbc5d2efe1c0089dc56414286dc6b (diff) | |
drm/radeon: fix PLLs on RS880 and older v2
commit 72edd83cc9e5819ed1ee771519143d7594e059f0 upstream.
This is a workaround for RS880 and older chips which seem to have
an additional limit on the minimum PLL input frequency.
v2: fix signed/unsigned warning
bugs:
https://bugzilla.kernel.org/show_bug.cgi?id=91861
https://bugzilla.kernel.org/show_bug.cgi?id=83461
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 00ead8c2758a..2e1e9aa79cea 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -959,6 +959,9 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll, if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV && pll->flags & RADEON_PLL_USE_REF_DIV) ref_div_max = pll->reference_div; + else if (pll->flags & RADEON_PLL_PREFER_MINM_OVER_MAXP) + /* fix for problems on RS880 */ + ref_div_max = min(pll->max_ref_div, 7u); else ref_div_max = pll->max_ref_div; |