drm/radeon/kms/atom: get better min pixel clock info

Where supported use ulMinPixelClockPLL_Output rather than
usMinPixelClockPLL_Output for pll_out_min.  This seems to
improve pll selection on some boards.

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

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 79d4b77..cec6791 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -641,8 +641,12 @@ bool radeon_atom_get_clock_info(struct drm_device *dev)
                    le16_to_cpu(firmware_info->info.usReferenceClock);
                p1pll->reference_div = 0;
 
-               p1pll->pll_out_min =
-                   le16_to_cpu(firmware_info->info.usMinPixelClockPLL_Output);
+               if (crev < 2)
+                       p1pll->pll_out_min =
+                               le16_to_cpu(firmware_info->info.usMinPixelClockPLL_Output);
+               else
+                       p1pll->pll_out_min =
+                               le32_to_cpu(firmware_info->info_12.ulMinPixelClockPLL_Output);
                p1pll->pll_out_max =
                    le32_to_cpu(firmware_info->info.ulMaxPixelClockPLL_Output);