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Commit 266d783b authored by Mika Kahola's avatar Mika Kahola Committed by Jani Nikula
Browse files

drm: Read DP branch device id 



Read DisplayPort branch device id string.

Reviewed-by: default avatarJim Bride <jim.bride@linux.intel.com>
Signed-off-by: default avatarMika Kahola <mika.kahola@intel.com>
Acked-by: default avatarDave Airlie <airlied@gmail.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-6-git-send-email-mika.kahola@intel.com
parent 7529d6af

drivers/gpu/drm/drm_dp_helper.c

+12 −0
Original line number Diff line number Diff line
@@ -513,6 +513,18 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 
}

EXPORT_SYMBOL(drm_dp_downstream_max_bpc);



/**

 * drm_dp_downstream_id() - identify branch device

 * @aux: DisplayPort AUX channel

 *

 * Returns branch device id on success or NULL on failure

 */

int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])

{

	return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6);

}

EXPORT_SYMBOL(drm_dp_downstream_id);



/*

 * I2C-over-AUX implementation

 */

include/drm/drm_dp_helper.h

+2 −0
Original line number Diff line number Diff line
@@ -445,6 +445,7 @@ 
#define DP_SOURCE_OUI			    0x300

#define DP_SINK_OUI			    0x400

#define DP_BRANCH_OUI			    0x500

#define DP_BRANCH_ID                        0x503



#define DP_SET_POWER                        0x600

# define DP_SET_POWER_D0                    0x1
@@ -819,6 +820,7 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 
				const u8 port_cap[4]);

int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],

			      const u8 port_cap[4]);

int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);



void drm_dp_aux_init(struct drm_dp_aux *aux);

int drm_dp_aux_register(struct drm_dp_aux *aux);