Commit c8f0b7cb authored by Damon Ding's avatar Damon Ding Committed by Dmitry Baryshkov
Browse files

drm/bridge: analogix_dp: Add support for &drm_dp_aux.wait_hpd_asserted() 



Add analogix_dpaux_wait_hpd_asserted() to help confirm the HPD state
before doing AUX transfers.

Signed-off-by: default avatarDamon Ding <damon.ding@rock-chips.com>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250310104114.2608063-8-damon.ding@rock-chips.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
parent e5e9fa9f

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

+21 −0
Original line number Diff line number Diff line
@@ -1540,6 +1540,26 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux, 
	return ret;

}



static int analogix_dpaux_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)

{

	struct analogix_dp_device *dp = to_dp(aux);

	int val;

	int ret;



	if (dp->force_hpd)

		return 0;



	pm_runtime_get_sync(dp->dev);



	ret = readx_poll_timeout(analogix_dp_get_plug_in_status, dp, val, !val,

				 wait_us / 100, wait_us);



	pm_runtime_mark_last_busy(dp->dev);

	pm_runtime_put_autosuspend(dp->dev);



	return ret;

}



struct analogix_dp_device *

analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)

{
@@ -1648,6 +1668,7 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data) 


	dp->aux.name = "DP-AUX";

	dp->aux.transfer = analogix_dpaux_transfer;

	dp->aux.wait_hpd_asserted = analogix_dpaux_wait_hpd_asserted;

	dp->aux.dev = dp->dev;

	drm_dp_aux_init(&dp->aux);