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Commit fef9f91f authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

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: default avatarAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 79f17c64

drivers/gpu/drm/radeon/atombios_crtc.c

+38 −0
Original line number Diff line number Diff line
@@ -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;