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| author |   Christian König <christian.koenig@amd.com> | 2015-01-29 16:01:03 +0100 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2015-02-02 11:39:33 -0500 |
| commit | 72edd83cc9e5819ed1ee771519143d7594e059f0 (patch) | |
| tree | c3ea01e726c16e1c43a00fe76131966df24a929a /drivers/gpu/drm/radeon/radeon_display.c | |
| parent | Merge tag 'drm-intel-fixes-2015-01-29' of git://anongit.freedesktop.org/drm-intel into drm-fixes (diff) | |
| download | linux-dev-72edd83cc9e5819ed1ee771519143d7594e059f0.tar.xz linux-dev-72edd83cc9e5819ed1ee771519143d7594e059f0.zip | |
drm/radeon: fix PLLs on RS880 and older v2
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>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_display.c')
| -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 102116902a07..913fafa597ad 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -960,6 +960,9 @@ 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; |