176 static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,  in drm_dp_dpcd_access()  argument
189 	mutex_lock(&aux->hw_mutex);  in drm_dp_dpcd_access()
199 		err = aux->transfer(aux, &msg);  in drm_dp_dpcd_access()
228 	mutex_unlock(&aux->hw_mutex);  in drm_dp_dpcd_access()
246 ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,  in drm_dp_dpcd_read()  argument
249 	return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, buffer,  in drm_dp_dpcd_read()
268 ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,  in drm_dp_dpcd_write()  argument
271 	return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer,  in drm_dp_dpcd_write()
284 int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,  in drm_dp_dpcd_read_link_status()  argument
287 	return drm_dp_dpcd_read(aux, DP_LANE0_1_STATUS, status,  in drm_dp_dpcd_read_link_status()
303 int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link)  in drm_dp_link_probe()  argument
310 	err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values));  in drm_dp_link_probe()
332 int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link)  in drm_dp_link_power_up()  argument
341 	err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);  in drm_dp_link_power_up()
348 	err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);  in drm_dp_link_power_up()
370 int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link)  in drm_dp_link_power_down()  argument
379 	err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);  in drm_dp_link_power_down()
386 	err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);  in drm_dp_link_power_down()
401 int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link)  in drm_dp_link_configure()  argument
412 	err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));  in drm_dp_link_configure()
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
551 		ret = aux->transfer(aux, msg);  in drm_dp_i2c_do_msg()
604 			aux->i2c_nack_count++;  in drm_dp_i2c_do_msg()
613 			aux->i2c_defer_count++;  in drm_dp_i2c_do_msg()
644 static int drm_dp_i2c_drain_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *orig_msg)  in drm_dp_i2c_drain_msg()  argument
650 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_drain_msg()
680 	struct drm_dp_aux *aux = adapter->algo_data;  in drm_dp_i2c_xfer()  local
690 	mutex_lock(&aux->hw_mutex);  in drm_dp_i2c_xfer()
701 		err = drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()
720 			err = drm_dp_i2c_drain_msg(aux, &msg);  in drm_dp_i2c_xfer()
744 	(void)drm_dp_i2c_do_msg(aux, &msg);  in drm_dp_i2c_xfer()
746 	mutex_unlock(&aux->hw_mutex);  in drm_dp_i2c_xfer()
762 int drm_dp_aux_register(struct drm_dp_aux *aux)  in drm_dp_aux_register()  argument
764 	mutex_init(&aux->hw_mutex);  in drm_dp_aux_register()
766 	aux->ddc.algo = &drm_dp_i2c_algo;  in drm_dp_aux_register()
767 	aux->ddc.algo_data = aux;  in drm_dp_aux_register()
768 	aux->ddc.retries = 3;  in drm_dp_aux_register()
770 	aux->ddc.class = I2C_CLASS_DDC;  in drm_dp_aux_register()
771 	aux->ddc.owner = THIS_MODULE;  in drm_dp_aux_register()
772 	aux->ddc.dev.parent = aux->dev;  in drm_dp_aux_register()
773 	aux->ddc.dev.of_node = aux->dev->of_node;  in drm_dp_aux_register()
775 	strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),  in drm_dp_aux_register()
776 		sizeof(aux->ddc.name));  in drm_dp_aux_register()
778 	return i2c_add_adapter(&aux->ddc);  in drm_dp_aux_register()
786 void drm_dp_aux_unregister(struct drm_dp_aux *aux)  in drm_dp_aux_unregister()  argument
788 	i2c_del_adapter(&aux->ddc);  in drm_dp_aux_unregister()