Commit af309c0c authored by Kuogee Hsieh's avatar Kuogee Hsieh Committed by Dmitry Baryshkov
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drm/msm/dp: retry 3 times if set sink to D0 poweer state failed 



Bring sink out of D3 (power down) mode into D0 (normal operation) mode
by setting DP_SET_POWER_D0 bit to DP_SET_POWER dpcd register. This
patch will retry 3 times if written to DP_SET_POWER register failed.

Changes in v5:
-- split into two patches

Signed-off-by: default avatarKuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/502536/
Link: https://lore.kernel.org/r/1662999830-13916-4-git-send-email-quic_khsieh@quicinc.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent d54c518a

drivers/gpu/drm/msm/dp/dp_link.c

+8 −5
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, 
{

	u8 value;

	ssize_t len;

	int i;



	if (link->revision < 0x11)

		return 0;
@@ -61,11 +62,13 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, 
	value &= ~DP_SET_POWER_MASK;

	value |= DP_SET_POWER_D0;



	/* retry for 1ms to give the sink time to wake up */

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

		len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);

	if (len < 0)

		return len;



		usleep_range(1000, 2000);

		if (len == 1)

			break;

	}



	return 0;

}