drm/radeon/atom: powergating fixes for DCE6

commit c205b232a64fed6d26edd7e40985b396de99a27f upstream.

Power gating is per crtc pair, but the powergating registers
should be called individually.  The hw handles power up/down
properly.  The pair is powered up if either crtc in the pair
is powered up and the pair is not powered down until both
crtcs in the pair are powered down.  This simplifies
programming and should save additional power as the previous
code never actually power gated the crtc pair.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index d86f948b388620c70f8b0d14709c87fc24f6376f..71bd61c33b7dde694a46740b9eb91da023814b4e 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -258,7 +258,6 @@ void atombios_crtc_dpms(struct drm_crtc *crtc, int mode)
                radeon_crtc->enabled = true;
                /* adjust pm to dpms changes BEFORE enabling crtcs */
                radeon_pm_compute_clocks(rdev);
-               /* disable crtc pair power gating before programming */
                if (ASIC_IS_DCE6(rdev) && !radeon_crtc->in_mode_set)
                        atombios_powergate_crtc(crtc, ATOM_DISABLE);
                atombios_enable_crtc(crtc, ATOM_ENABLE);
@@ -278,25 +277,8 @@ void atombios_crtc_dpms(struct drm_crtc *crtc, int mode)
                        atombios_enable_crtc_memreq(crtc, ATOM_DISABLE);
                atombios_enable_crtc(crtc, ATOM_DISABLE);
                radeon_crtc->enabled = false;
-               /* power gating is per-pair */
-               if (ASIC_IS_DCE6(rdev) && !radeon_crtc->in_mode_set) {
-                       struct drm_crtc *other_crtc;
-                       struct radeon_crtc *other_radeon_crtc;
-                       list_for_each_entry(other_crtc, &rdev->ddev->mode_config.crtc_list, head) {
-                               other_radeon_crtc = to_radeon_crtc(other_crtc);
-                               if (((radeon_crtc->crtc_id == 0) && (other_radeon_crtc->crtc_id == 1)) ||
-                                   ((radeon_crtc->crtc_id == 1) && (other_radeon_crtc->crtc_id == 0)) ||
-                                   ((radeon_crtc->crtc_id == 2) && (other_radeon_crtc->crtc_id == 3)) ||
-                                   ((radeon_crtc->crtc_id == 3) && (other_radeon_crtc->crtc_id == 2)) ||
-                                   ((radeon_crtc->crtc_id == 4) && (other_radeon_crtc->crtc_id == 5)) ||
-                                   ((radeon_crtc->crtc_id == 5) && (other_radeon_crtc->crtc_id == 4))) {
-                                       /* if both crtcs in the pair are off, enable power gating */
-                                       if (other_radeon_crtc->enabled == false)
-                                               atombios_powergate_crtc(crtc, ATOM_ENABLE);
-                                       break;
-                               }
-                       }
-               }
+               if (ASIC_IS_DCE6(rdev) && !radeon_crtc->in_mode_set)
+                       atombios_powergate_crtc(crtc, ATOM_ENABLE);
                /* adjust pm to dpms changes AFTER disabling crtcs */
                radeon_pm_compute_clocks(rdev);
                break;