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>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 79d4b771c770..cec67917179f 100644
--- 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);