1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "dmub/dmub_srv_stat.h"
27 #include "dmub/inc/dmub_cmd.h"
28 
29 /**
30  * DOC: DMUB_SRV STAT Interface
31  *
32  * These interfaces are called without acquiring DAL and DC locks.
33  * Hence, there is limitations on whese interfaces can access. Only
34  * variables exclusively defined for these interfaces can be modified.
35  */
36 
37 /**
38  * dmub_srv_stat_get_notification - Retrieves a dmub outbox notification, set up dmub notification
39  *                                  structure with message information. Also a pending bit if queue
40  *                                  is having more notifications
41  *  @dmub: dmub srv structure
42  *  @notify: dmub notification structure to be filled up
43  *
44  *  Returns: dmub_status
45  */
46 enum dmub_status dmub_srv_stat_get_notification(struct dmub_srv *dmub,
47 						struct dmub_notification *notify)
48 {
49 	/**
50 	 * This function is called without dal and dc locks, so
51 	 * we shall not modify any dmub variables, only dmub->outbox1_rb
52 	 * is exempted as it is exclusively accessed by this function
53 	 */
54 	union dmub_rb_out_cmd cmd = {0};
55 
56 	if (!dmub->hw_init) {
57 		notify->type = DMUB_NOTIFICATION_NO_DATA;
58 		notify->pending_notification = false;
59 		return DMUB_STATUS_INVALID;
60 	}
61 
62 	/* Get write pointer which is updated by dmub */
63 	dmub->outbox1_rb.wrpt = dmub->hw_funcs.get_outbox1_wptr(dmub);
64 
65 	if (!dmub_rb_out_front(&dmub->outbox1_rb, &cmd)) {
66 		notify->type = DMUB_NOTIFICATION_NO_DATA;
67 		notify->pending_notification = false;
68 		return DMUB_STATUS_OK;
69 	}
70 
71 	switch (cmd.cmd_common.header.type) {
72 	case DMUB_OUT_CMD__DP_AUX_REPLY:
73 		notify->type = DMUB_NOTIFICATION_AUX_REPLY;
74 		notify->link_index = cmd.dp_aux_reply.control.instance;
75 		notify->result = cmd.dp_aux_reply.control.result;
76 		dmub_memcpy((void *)&notify->aux_reply,
77 			(void *)&cmd.dp_aux_reply.reply_data, sizeof(struct aux_reply_data));
78 		break;
79 	case DMUB_OUT_CMD__DP_HPD_NOTIFY:
80 		if (cmd.dp_hpd_notify.hpd_data.hpd_type == DP_HPD) {
81 			notify->type = DMUB_NOTIFICATION_HPD;
82 			notify->hpd_status = cmd.dp_hpd_notify.hpd_data.hpd_status;
83 		} else {
84 			notify->type = DMUB_NOTIFICATION_HPD_IRQ;
85 		}
86 
87 		notify->link_index = cmd.dp_hpd_notify.hpd_data.instance;
88 		notify->result = AUX_RET_SUCCESS;
89 		break;
90 	case DMUB_OUT_CMD__SET_CONFIG_REPLY:
91 		notify->type = DMUB_NOTIFICATION_SET_CONFIG_REPLY;
92 		notify->link_index = cmd.set_config_reply.set_config_reply_control.instance;
93 		notify->sc_status = cmd.set_config_reply.set_config_reply_control.status;
94 		break;
95 	default:
96 		notify->type = DMUB_NOTIFICATION_NO_DATA;
97 		break;
98 	}
99 
100 	/* Pop outbox1 ringbuffer and update read pointer */
101 	dmub_rb_pop_front(&dmub->outbox1_rb);
102 	dmub->hw_funcs.set_outbox1_rptr(dmub, dmub->outbox1_rb.rptr);
103 
104 	/**
105 	 * Notify dc whether dmub has a pending outbox message,
106 	 * this is to avoid one more call to dmub_srv_stat_get_notification
107 	 */
108 	if (dmub_rb_empty(&dmub->outbox1_rb))
109 		notify->pending_notification = false;
110 	else
111 		notify->pending_notification = true;
112 
113 	return DMUB_STATUS_OK;
114 }
115