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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>
This commit is contained in:
Alex Deucher 2012-03-20 17:18:03 -04:00 committed by Dave Airlie
parent 79f17c64b2
commit fef9f91fec
1 changed files with 38 additions and 0 deletions
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38
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -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;