33 static int edp_msg_fifo_tx(struct edp_aux *aux, struct drm_dp_aux_msg *msg)  in edp_msg_fifo_tx()  argument
67 		edp_write(aux->base + REG_EDP_AUX_DATA, reg);  in edp_msg_fifo_tx()
75 	edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, reg);  in edp_msg_fifo_tx()
80 static int edp_msg_fifo_rx(struct edp_aux *aux, struct drm_dp_aux_msg *msg)  in edp_msg_fifo_rx()  argument
87 	edp_write(aux->base + REG_EDP_AUX_DATA,  in edp_msg_fifo_rx()
93 	data = edp_read(aux->base + REG_EDP_AUX_DATA);  in edp_msg_fifo_rx()
95 		data = edp_read(aux->base + REG_EDP_AUX_DATA);  in edp_msg_fifo_rx()
103  * This function does the real job to process an AUX transaction.
104  * It will call msm_edp_aux_ctrl() function to reset the AUX channel,
108  * start transaction only when AUX channel is fully enabled.
113 	struct edp_aux *aux = to_edp_aux(drm_aux);  in edp_aux_transfer()  local
134 	mutex_lock(&aux->msg_mutex);  in edp_aux_transfer()
136 	aux->msg_err = false;  in edp_aux_transfer()
137 	reinit_completion(&aux->msg_comp);  in edp_aux_transfer()
139 	ret = edp_msg_fifo_tx(aux, msg);  in edp_aux_transfer()
144 	time_left = wait_for_completion_timeout(&aux->msg_comp,  in edp_aux_transfer()
148 		 * Clear GO and reset AUX channel  in edp_aux_transfer()
151 		edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, 0);  in edp_aux_transfer()
152 		msm_edp_aux_ctrl(aux, 1);  in edp_aux_transfer()
153 		pr_err("%s: aux timeout,\n", __func__);  in edp_aux_transfer()
159 	if (!aux->msg_err) {  in edp_aux_transfer()
161 			ret = edp_msg_fifo_rx(aux, msg);  in edp_aux_transfer()
183 	mutex_unlock(&aux->msg_mutex);  in edp_aux_transfer()
190 	struct edp_aux *aux = NULL;  in msm_edp_aux_init()  local
194 	aux = devm_kzalloc(dev, sizeof(*aux), GFP_KERNEL);  in msm_edp_aux_init()
195 	if (!aux)  in msm_edp_aux_init()
198 	aux->base = regbase;  in msm_edp_aux_init()
199 	mutex_init(&aux->msg_mutex);  in msm_edp_aux_init()
200 	init_completion(&aux->msg_comp);  in msm_edp_aux_init()
202 	aux->drm_aux.name = "msm_edp_aux";  in msm_edp_aux_init()
203 	aux->drm_aux.dev = dev;  in msm_edp_aux_init()
204 	aux->drm_aux.transfer = edp_aux_transfer;  in msm_edp_aux_init()
205 	ret = drm_dp_aux_register(&aux->drm_aux);  in msm_edp_aux_init()
207 		pr_err("%s: failed to register drm aux: %d\n", __func__, ret);  in msm_edp_aux_init()
208 		mutex_destroy(&aux->msg_mutex);  in msm_edp_aux_init()
211 	if (drm_aux && aux)  in msm_edp_aux_init()
212 		*drm_aux = &aux->drm_aux;  in msm_edp_aux_init()
214 	return aux;  in msm_edp_aux_init()
217 void msm_edp_aux_destroy(struct device *dev, struct edp_aux *aux)  in msm_edp_aux_destroy()  argument
219 	if (aux) {  in msm_edp_aux_destroy()
220 		drm_dp_aux_unregister(&aux->drm_aux);  in msm_edp_aux_destroy()
221 		mutex_destroy(&aux->msg_mutex);  in msm_edp_aux_destroy()
225 irqreturn_t msm_edp_aux_irq(struct edp_aux *aux, u32 isr)  in msm_edp_aux_irq()  argument
229 		edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, 0);  in msm_edp_aux_irq()
232 			aux->msg_err = true;  in msm_edp_aux_irq()
234 			aux->msg_err = false;  in msm_edp_aux_irq()
236 		complete(&aux->msg_comp);  in msm_edp_aux_irq()
242 void msm_edp_aux_ctrl(struct edp_aux *aux, int enable)  in msm_edp_aux_ctrl()  argument
247 	data = edp_read(aux->base + REG_EDP_AUX_CTRL);  in msm_edp_aux_ctrl()
251 		edp_write(aux->base + REG_EDP_AUX_CTRL, data);  in msm_edp_aux_ctrl()
258 		edp_write(aux->base + REG_EDP_AUX_CTRL, data);  in msm_edp_aux_ctrl()
261 		edp_write(aux->base + REG_EDP_AUX_CTRL, data);  in msm_edp_aux_ctrl()