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drm: Read DP branch device id

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Read DisplayPort branch device id string.

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-6-git-send-email-mika.kahola@intel.com
This commit is contained in:
Mika Kahola
2016-09-09 14:10:51 +03:00
committed by Jani Nikula
parent 7529d6af1c
commit 266d783baa
2 changed files with 14 additions and 0 deletions
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12
drivers/gpu/drm/drm_dp_helper.c
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@@ -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
*/