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drm/radeon: fix up pll selection on DCE5/6 

Selecting ATOM_PPLL_INVALID should be equivalent as the
DCPLL or PPLL0 are already programmed for the DISPCLK, but
the preferred method is to always specify the PLL selected.
SetPixelClock will check the parameters and skip the
programming if the PLL is already set up.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Alex Deucher 2012-07-17 14:02:43 -04:00 committed by Christian König
parent 377edc8bbd
commit 26fe45a0a7
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -1539,7 +1539,11 @@ static int radeon_atom_pick_pll(struct drm_crtc *crtc)
* crtc virtual pixel clock.
*/
if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(test_encoder))) {
if (ASIC_IS_DCE5(rdev) || rdev->clock.dp_extclk)
if (ASIC_IS_DCE5(rdev))
return ATOM_DCPLL;
else if (ASIC_IS_DCE6(rdev))
return ATOM_PPLL0;
else if (rdev->clock.dp_extclk)
return ATOM_PPLL_INVALID;
}
}