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Commit 58c67ce9 authored by Jani Nikula's avatar Jani Nikula Committed by Daniel Vetter
Browse files

drm/i915/dp: retry i2c-over-aux seven times on AUX DEFER 



Per DP1.2 spec.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarTodd Previte <tprevite@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent f7d85c1e

drivers/gpu/drm/i915/intel_dp.c

+6 −1
Original line number Diff line number Diff line
@@ -654,7 +654,12 @@ intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode, 
		break;

	}



	for (retry = 0; retry < 5; retry++) {

	/*

	 * DP1.2 sections 2.7.7.1.5.6.1 and 2.7.7.1.6.6.1: A DP Source device is

	 * required to retry at least seven times upon receiving AUX_DEFER

	 * before giving up the AUX transaction.

	 */

	for (retry = 0; retry < 7; retry++) {

		ret = intel_dp_aux_ch(intel_dp,

				      msg, msg_bytes,

				      reply, reply_bytes);