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Commit c7ad3810 authored by Jesse Barnes's avatar Jesse Barnes Committed by Keith Packard
Browse files

drm/i915/dp: manage sink power state if possible 



On sinks with a DPCD rev of 1.1 or greater, we can send sink power
management commands to address 0x600 per section 5.1.5 of the
DisplayPort 1.1a spec.

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: default avatarKeith Packard <keithp@keithp.com>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
parent df0c237d

drivers/gpu/drm/i915/intel_dp.c

+35 −0
Original line number Diff line number Diff line
@@ -942,11 +942,44 @@ static void ironlake_edp_pll_off(struct drm_encoder *encoder) 
	udelay(200);

}



/* If the sink supports it, try to set the power state appropriately */

static void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)

{

	int ret, i;



	/* Should have a valid DPCD by this point */

	if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)

		return;



	if (mode != DRM_MODE_DPMS_ON) {

		ret = intel_dp_aux_native_write_1(intel_dp, DP_SET_POWER,

						  DP_SET_POWER_D3);

		if (ret != 1)

			DRM_DEBUG_DRIVER("failed to write sink power state\n");

	} else {

		/*

		 * When turning on, we need to retry for 1ms to give the sink

		 * time to wake up.

		 */

		for (i = 0; i < 3; i++) {

			ret = intel_dp_aux_native_write_1(intel_dp,

							  DP_SET_POWER,

							  DP_SET_POWER_D0);

			if (ret == 1)

				break;

			msleep(1);

		}

	}

}



static void intel_dp_prepare(struct drm_encoder *encoder)

{

	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

	struct drm_device *dev = encoder->dev;



	/* Wake up the sink first */

	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);



	if (is_edp(intel_dp)) {

		ironlake_edp_backlight_off(dev);

		ironlake_edp_panel_off(dev);
@@ -990,6 +1023,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode) 
	if (mode != DRM_MODE_DPMS_ON) {

		if (is_edp(intel_dp))

			ironlake_edp_backlight_off(dev);

		intel_dp_sink_dpms(intel_dp, mode);

		intel_dp_link_down(intel_dp);

		if (is_edp(intel_dp))

			ironlake_edp_panel_off(dev);
@@ -998,6 +1032,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode) 
	} else {

		if (is_edp(intel_dp))

			ironlake_edp_panel_vdd_on(intel_dp);

		intel_dp_sink_dpms(intel_dp, mode);

		if (!(dp_reg & DP_PORT_EN)) {

			intel_dp_start_link_train(intel_dp);

			if (is_edp(intel_dp)) {