drm/radeon/kms: add LVDS pll quirk for Dell Studio 15

fixes fdo bug 26358

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 731210bef744..79d445373c34 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1109,6 +1109,15 @@ static void radeon_atom_apply_lvds_quirks(struct drm_device *dev,
                         lvds->pll_algo = PLL_ALGO_LEGACY;
         }
 
+        /* Dell Studio 15 laptop panel doesn't like new pll divider algo */
+        if ((dev->pdev->device == 0x95c4) &&
+            (dev->pdev->subsystem_vendor == 0x1028) &&
+            (dev->pdev->subsystem_device == 0x029f)) {
+                if ((lvds->native_mode.hdisplay == 1280) &&
+                    (lvds->native_mode.vdisplay == 800))
+                        lvds->pll_algo = PLL_ALGO_LEGACY;
+        }
+
 }
 
 union lvds_info {