179 	struct drm_dp_aux_msg msg;  in drm_dp_dpcd_access()  local
183 	memset(&msg, 0, sizeof(msg));  in drm_dp_dpcd_access()
184 	msg.address = offset;  in drm_dp_dpcd_access()
185 	msg.request = request;  in drm_dp_dpcd_access()
186 	msg.buffer = buffer;  in drm_dp_dpcd_access()
187 	msg.size = size;  in drm_dp_dpcd_access()
199 		err = aux->transfer(aux, &msg);  in drm_dp_dpcd_access()
208 		switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) {  in drm_dp_dpcd_access()
432 static void drm_dp_i2c_msg_write_status_update(struct drm_dp_aux_msg *msg)  in drm_dp_i2c_msg_write_status_update()  argument
439 	if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_I2C_WRITE) {  in drm_dp_i2c_msg_write_status_update()
440 		msg->request &= DP_AUX_I2C_MOT;  in drm_dp_i2c_msg_write_status_update()
441 		msg->request |= DP_AUX_I2C_WRITE_STATUS_UPDATE;  in drm_dp_i2c_msg_write_status_update()
457 static int drm_dp_aux_req_duration(const struct drm_dp_aux_msg *msg)  in drm_dp_aux_req_duration()  argument
462 	if ((msg->request & DP_AUX_I2C_READ) == 0)  in drm_dp_aux_req_duration()
463 		len += msg->size * 8;  in drm_dp_aux_req_duration()
468 static int drm_dp_aux_reply_duration(const struct drm_dp_aux_msg *msg)  in drm_dp_aux_reply_duration()  argument
477 	if (msg->request & DP_AUX_I2C_READ)  in drm_dp_aux_reply_duration()
478 		len += msg->size * 8;  in drm_dp_aux_reply_duration()
496 static int drm_dp_i2c_msg_duration(const struct drm_dp_aux_msg *msg,  in drm_dp_i2c_msg_duration()  argument
501 			     msg->size * I2C_DATA_LEN +  in drm_dp_i2c_msg_duration()
510 static int drm_dp_i2c_retry_count(const struct drm_dp_aux_msg *msg,  in drm_dp_i2c_retry_count()  argument
513 	int aux_time_us = drm_dp_aux_req_duration(msg) +  in drm_dp_i2c_retry_count()
514 		drm_dp_aux_reply_duration(msg);  in drm_dp_i2c_retry_count()
515 	int i2c_time_us = drm_dp_i2c_msg_duration(msg, i2c_speed_khz);  in drm_dp_i2c_retry_count()
537 static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)  in drm_dp_i2c_do_msg()  argument
548 	int max_retries = max(7, drm_dp_i2c_retry_count(msg, dp_aux_i2c_speed_khz));  in drm_dp_i2c_do_msg()
551 		ret = aux->transfer(aux, msg);  in drm_dp_i2c_do_msg()
561 		switch (msg->reply & DP_AUX_NATIVE_REPLY_MASK) {  in drm_dp_i2c_do_msg()
570 			DRM_DEBUG_KMS("native nack (result=%d, size=%zu)\n", ret, msg->size);  in drm_dp_i2c_do_msg()
588 			DRM_ERROR("invalid native reply %#04x\n", msg->reply);  in drm_dp_i2c_do_msg()
592 		switch (msg->reply & DP_AUX_I2C_REPLY_MASK) {  in drm_dp_i2c_do_msg()
598 			if (ret != msg->size)  in drm_dp_i2c_do_msg()
599 				drm_dp_i2c_msg_write_status_update(msg);  in drm_dp_i2c_do_msg()
603 			DRM_DEBUG_KMS("I2C nack (result=%d, size=%zu\n", ret, msg->size);  in drm_dp_i2c_do_msg()
617 			drm_dp_i2c_msg_write_status_update(msg);  in drm_dp_i2c_do_msg()
622 			DRM_ERROR("invalid I2C reply %#04x\n", msg->reply);  in drm_dp_i2c_do_msg()
631 static void drm_dp_i2c_msg_set_request(struct drm_dp_aux_msg *msg,  in drm_dp_i2c_msg_set_request()  argument
634 	msg->request = (i2c_msg->flags & I2C_M_RD) ?  in drm_dp_i2c_msg_set_request()
636 	msg->request |= DP_AUX_I2C_MOT;  in drm_dp_i2c_msg_set_request()
647 	struct drm_dp_aux_msg msg = *orig_msg;  in drm_dp_i2c_drain_msg()  local
649 	while (msg.size > 0) {  in drm_dp_i2c_drain_msg()
650 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_drain_msg()
654 		if (err < msg.size && err < ret) {  in drm_dp_i2c_drain_msg()
656 				      msg.size, err);  in drm_dp_i2c_drain_msg()
660 		msg.size -= err;  in drm_dp_i2c_drain_msg()
661 		msg.buffer += err;  in drm_dp_i2c_drain_msg()
683 	struct drm_dp_aux_msg msg;  in drm_dp_i2c_xfer()  local
688 	memset(&msg, 0, sizeof(msg));  in drm_dp_i2c_xfer()
693 		msg.address = msgs[i].addr;  in drm_dp_i2c_xfer()
694 		drm_dp_i2c_msg_set_request(&msg, &msgs[i]);  in drm_dp_i2c_xfer()
699 		msg.buffer = NULL;  in drm_dp_i2c_xfer()
700 		msg.size = 0;  in drm_dp_i2c_xfer()
701 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()
707 		drm_dp_i2c_msg_set_request(&msg, &msgs[i]);  in drm_dp_i2c_xfer()
716 		for (j = 0; j < msgs[i].len; j += msg.size) {  in drm_dp_i2c_xfer()
717 			msg.buffer = msgs[i].buf + j;  in drm_dp_i2c_xfer()
718 			msg.size = min(transfer_size, msgs[i].len - j);  in drm_dp_i2c_xfer()
720 			err = drm_dp_i2c_drain_msg(aux, &msg);  in drm_dp_i2c_xfer()
726 			drm_dp_i2c_msg_set_request(&msg, &msgs[i]);  in drm_dp_i2c_xfer()
741 	msg.request &= ~DP_AUX_I2C_MOT;  in drm_dp_i2c_xfer()
742 	msg.buffer = NULL;  in drm_dp_i2c_xfer()
743 	msg.size = 0;  in drm_dp_i2c_xfer()
744 	(void)drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()