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Commit d816f077 authored by Rob Clark's avatar Rob Clark
Browse files

drm/dp: add drm_dp_link_power_down() helper 



We had _power_up(), but drivers also need to be able to power down.

Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
Reviewed-by: default avatarThierry Reding <treding@nvidia.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 9ec60ca6

drivers/gpu/drm/drm_dp_helper.c

+31 −0
Original line number Original line Diff line number Diff line
@@ -353,6 +353,37 @@ int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link) 
}

}

EXPORT_SYMBOL(drm_dp_link_power_up);

EXPORT_SYMBOL(drm_dp_link_power_up);





/**

 * drm_dp_link_power_down() - power down a DisplayPort link

 * @aux: DisplayPort AUX channel

 * @link: pointer to a structure containing the link configuration

 *

 * Returns 0 on success or a negative error code on failure.

 */

int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link)

{

	u8 value;

	int err;



	/* DP_SET_POWER register is only available on DPCD v1.1 and later */

	if (link->revision < 0x11)

		return 0;



	err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);

	if (err < 0)

		return err;



	value &= ~DP_SET_POWER_MASK;

	value |= DP_SET_POWER_D3;



	err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);

	if (err < 0)

		return err;



	return 0;

}

EXPORT_SYMBOL(drm_dp_link_power_down);



/**

/**

 * drm_dp_link_configure() - configure a DisplayPort link

 * drm_dp_link_configure() - configure a DisplayPort link

 * @aux: DisplayPort AUX channel

 * @aux: DisplayPort AUX channel

include/drm/drm_dp_helper.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -586,6 +586,7 @@ struct drm_dp_link { 




int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);

int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);





int drm_dp_aux_register(struct drm_dp_aux *aux);

int drm_dp_aux_register(struct drm_dp_aux *aux);