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drm/radeon/dce3: use a single PPLL for all DP displays 

If possible, use a single PPLL for multiple DP displays
on DCE3.x.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2012-09-12 17:39:57 -04:00
parent f3dd8508d4
commit 9dbbcfc689
1 changed files with 24 additions and 0 deletions
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24
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -1652,6 +1652,30 @@ static int radeon_atom_pick_pll(struct drm_crtc *crtc)
return ATOM_PPLL1;
DRM_ERROR("unable to allocate a PPLL\n");
return ATOM_PPLL_INVALID;
} else if (ASIC_IS_DCE3(rdev)) {
list_for_each_entry(test_encoder, &dev->mode_config.encoder_list, head) {
if (test_encoder->crtc && (test_encoder->crtc == crtc)) {
/* in DP mode, the DP ref clock can come from either PPLL
* depending on the asic:
* DCE3: PPLL1 or PPLL2
*/
if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(test_encoder))) {
/* use the same PPLL for all DP monitors */
pll = radeon_get_shared_dp_ppll(crtc);
if (pll != ATOM_PPLL_INVALID)
return pll;
}
break;
}
}
/* all other cases */
pll_in_use = radeon_get_pll_use_mask(crtc);
if (!(pll_in_use & (1 << ATOM_PPLL2)))
return ATOM_PPLL2;
if (!(pll_in_use & (1 << ATOM_PPLL1)))
return ATOM_PPLL1;
DRM_ERROR("unable to allocate a PPLL\n");
return ATOM_PPLL_INVALID;
} else
/* use PPLL1 or PPLL2 */
return radeon_crtc->crtc_id;