drm/radeon/kms/atom: add support for crtc power gating

Each pair of crtcs (0/1, 2/3, 4/5) can be power gated.
Make sure the power is applied when the crtc is in use and
only power down the pair when both are off.

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 841ee3e1a1722c5aab4a1729a0d312dafe1a5887..62ddf8dd9e6948e51a46ce9b84e798676e88ff3f 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -231,6 +231,22 @@ static void atombios_blank_crtc(struct drm_crtc *crtc, int state)
        atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
 
+static void atombios_powergate_crtc(struct drm_crtc *crtc, int state)
+{
+       struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
+       struct drm_device *dev = crtc->dev;
+       struct radeon_device *rdev = dev->dev_private;
+       int index = GetIndexIntoMasterTable(COMMAND, EnableDispPowerGating);
+       ENABLE_DISP_POWER_GATING_PARAMETERS_V2_1 args;
+
+       memset(&args, 0, sizeof(args));
+
+       args.ucDispPipeId = radeon_crtc->crtc_id;
+       args.ucEnable = state;
+
+       atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+}
+
 void atombios_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
        struct drm_device *dev = crtc->dev;
@@ -242,6 +258,9 @@ 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))
+                       atombios_powergate_crtc(crtc, ATOM_DISABLE);
                atombios_enable_crtc(crtc, ATOM_ENABLE);
                if (ASIC_IS_DCE3(rdev) && !ASIC_IS_DCE6(rdev))
                        atombios_enable_crtc_memreq(crtc, ATOM_ENABLE);
@@ -259,6 +278,25 @@ 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)) {
+                       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;
+                               }
+                       }
+               }
                /* adjust pm to dpms changes AFTER disabling crtcs */
                radeon_pm_compute_clocks(rdev);
                break;