drm/radeon/kms/atom: Fix DVO support
DVO in 12 bit mode (which seems to be the most common
config) requires 2x ppll.
Fixes fdo bug 21857.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index e5a3c30..8516e1b 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -483,8 +483,14 @@
atom_execute_table(rdev->mode_info.atom_context,
index, (uint32_t *)&adjust_pll_args);
adjusted_clock = le16_to_cpu(adjust_pll_args.usPixelClock) * 10;
- } else
- adjusted_clock = mode->clock;
+ } else {
+ /* DVO wants 2x pixel clock if the DVO chip is in 12 bit mode */
+ if (ASIC_IS_AVIVO(rdev) &&
+ (radeon_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DVO1))
+ adjusted_clock = mode->clock * 2;
+ else
+ adjusted_clock = mode->clock;
+ }
if (radeon_crtc->crtc_id == 0)
pll = &rdev->clock.p1pll;