]> Git Repo - linux.git/blob - drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.c
Merge tag 'linux-watchdog-6.14-rc1' of git://www.linux-watchdog.org/linux-watchdog
[linux.git] / drivers / gpu / drm / amd / display / dc / link / protocols / link_hpd.c
1 /*
2  * Copyright 2022 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 /* FILE POLICY AND INTENDED USAGE:
27  *
28  * This file implements functions that manage basic HPD components such as gpio.
29  * It also provides wrapper functions to execute HPD related programming. This
30  * file only manages basic HPD functionality. It doesn't manage detection or
31  * feature or signal specific HPD behaviors.
32  */
33 #include "link_hpd.h"
34 #include "gpio_service_interface.h"
35
36 bool link_get_hpd_state(struct dc_link *link)
37 {
38         uint32_t state = 0;
39
40         dal_gpio_lock_pin(link->hpd_gpio);
41         dal_gpio_get_value(link->hpd_gpio, &state);
42         dal_gpio_unlock_pin(link->hpd_gpio);
43
44         return state;
45 }
46
47 void link_enable_hpd(const struct dc_link *link)
48 {
49         struct link_encoder *encoder = link->link_enc;
50
51         if (encoder != NULL && encoder->funcs->enable_hpd != NULL)
52                 encoder->funcs->enable_hpd(encoder);
53 }
54
55 void link_disable_hpd(const struct dc_link *link)
56 {
57         struct link_encoder *encoder = link->link_enc;
58
59         if (encoder != NULL && encoder->funcs->enable_hpd != NULL)
60                 encoder->funcs->disable_hpd(encoder);
61 }
62
63 void link_enable_hpd_filter(struct dc_link *link, bool enable)
64 {
65         struct gpio *hpd;
66
67         if (enable) {
68                 link->is_hpd_filter_disabled = false;
69                 program_hpd_filter(link);
70         } else {
71                 link->is_hpd_filter_disabled = true;
72                 /* Obtain HPD handle */
73                 hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id, link->ctx->gpio_service);
74
75                 if (!hpd)
76                         return;
77
78                 /* Setup HPD filtering */
79                 if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
80                         struct gpio_hpd_config config;
81
82                         config.delay_on_connect = 0;
83                         config.delay_on_disconnect = 0;
84
85                         dal_irq_setup_hpd_filter(hpd, &config);
86
87                         dal_gpio_close(hpd);
88                 } else {
89                         ASSERT_CRITICAL(false);
90                 }
91                 /* Release HPD handle */
92                 dal_gpio_destroy_irq(&hpd);
93         }
94 }
95
96 struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
97                           struct graphics_object_id link_id,
98                           struct gpio_service *gpio_service)
99 {
100         enum bp_result bp_result;
101         struct graphics_object_hpd_info hpd_info;
102         struct gpio_pin_info pin_info;
103
104         if (dcb->funcs->get_hpd_info(dcb, link_id, &hpd_info) != BP_RESULT_OK)
105                 return NULL;
106
107         bp_result = dcb->funcs->get_gpio_pin_info(dcb,
108                 hpd_info.hpd_int_gpio_uid, &pin_info);
109
110         if (bp_result != BP_RESULT_OK) {
111                 ASSERT(bp_result == BP_RESULT_NORECORD);
112                 return NULL;
113         }
114
115         return dal_gpio_service_create_irq(gpio_service,
116                                            pin_info.offset,
117                                            pin_info.mask);
118 }
119
120 bool query_hpd_status(struct dc_link *link, uint32_t *is_hpd_high)
121 {
122         struct gpio *hpd_pin = link_get_hpd_gpio(
123                         link->ctx->dc_bios, link->link_id,
124                         link->ctx->gpio_service);
125         if (!hpd_pin)
126                 return false;
127
128         dal_gpio_open(hpd_pin, GPIO_MODE_INTERRUPT);
129         dal_gpio_get_value(hpd_pin, is_hpd_high);
130         dal_gpio_close(hpd_pin);
131         dal_gpio_destroy_irq(&hpd_pin);
132         return true;
133 }
134
135 enum hpd_source_id get_hpd_line(struct dc_link *link)
136 {
137         struct gpio *hpd;
138         enum hpd_source_id hpd_id;
139
140                 hpd_id = HPD_SOURCEID_UNKNOWN;
141
142         hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id,
143                            link->ctx->gpio_service);
144
145         if (hpd) {
146                 switch (dal_irq_get_source(hpd)) {
147                 case DC_IRQ_SOURCE_HPD1:
148                         hpd_id = HPD_SOURCEID1;
149                 break;
150                 case DC_IRQ_SOURCE_HPD2:
151                         hpd_id = HPD_SOURCEID2;
152                 break;
153                 case DC_IRQ_SOURCE_HPD3:
154                         hpd_id = HPD_SOURCEID3;
155                 break;
156                 case DC_IRQ_SOURCE_HPD4:
157                         hpd_id = HPD_SOURCEID4;
158                 break;
159                 case DC_IRQ_SOURCE_HPD5:
160                         hpd_id = HPD_SOURCEID5;
161                 break;
162                 case DC_IRQ_SOURCE_HPD6:
163                         hpd_id = HPD_SOURCEID6;
164                 break;
165                 default:
166                         BREAK_TO_DEBUGGER();
167                 break;
168                 }
169
170                 dal_gpio_destroy_irq(&hpd);
171         }
172
173         return hpd_id;
174 }
175
176 bool program_hpd_filter(const struct dc_link *link)
177 {
178         bool result = false;
179         struct gpio *hpd;
180         int delay_on_connect_in_ms = 0;
181         int delay_on_disconnect_in_ms = 0;
182
183         if (link->is_hpd_filter_disabled)
184                 return false;
185         /* Verify feature is supported */
186         switch (link->connector_signal) {
187         case SIGNAL_TYPE_DVI_SINGLE_LINK:
188         case SIGNAL_TYPE_DVI_DUAL_LINK:
189         case SIGNAL_TYPE_HDMI_TYPE_A:
190                 /* Program hpd filter */
191                 delay_on_connect_in_ms = 500;
192                 delay_on_disconnect_in_ms = 100;
193                 break;
194         case SIGNAL_TYPE_DISPLAY_PORT:
195         case SIGNAL_TYPE_DISPLAY_PORT_MST:
196                 /* Program hpd filter to allow DP signal to settle */
197                 /* 500: not able to detect MST <-> SST switch as HPD is low for
198                  * only 100ms on DELL U2413
199                  * 0: some passive dongle still show aux mode instead of i2c
200                  * 20-50: not enough to hide bouncing HPD with passive dongle.
201                  * also see intermittent i2c read issues.
202                  */
203                 delay_on_connect_in_ms = 80;
204                 delay_on_disconnect_in_ms = 0;
205                 break;
206         case SIGNAL_TYPE_LVDS:
207         case SIGNAL_TYPE_EDP:
208         default:
209                 /* Don't program hpd filter */
210                 return false;
211         }
212
213         /* Obtain HPD handle */
214         hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id,
215                            link->ctx->gpio_service);
216
217         if (!hpd)
218                 return result;
219
220         /* Setup HPD filtering */
221         if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
222                 struct gpio_hpd_config config;
223
224                 config.delay_on_connect = delay_on_connect_in_ms;
225                 config.delay_on_disconnect = delay_on_disconnect_in_ms;
226
227                 dal_irq_setup_hpd_filter(hpd, &config);
228
229                 dal_gpio_close(hpd);
230
231                 result = true;
232         } else {
233                 ASSERT_CRITICAL(false);
234         }
235
236         /* Release HPD handle */
237         dal_gpio_destroy_irq(&hpd);
238
239         return result;
240 }
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