xref: /dragonfly/sys/dev/drm/i915/intel_lspcon.c (revision 5ca0a96d)
1 /*
2  * Copyright © 2016 Intel Corporation
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 (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  *
24  */
25 #include <drm/drm_edid.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_dp_dual_mode_helper.h>
28 #include "intel_drv.h"
29 
30 static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
31 {
32 	struct intel_digital_port *dig_port =
33 		container_of(lspcon, struct intel_digital_port, lspcon);
34 
35 	return &dig_port->dp;
36 }
37 
38 static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
39 {
40 	switch (mode) {
41 	case DRM_LSPCON_MODE_PCON:
42 		return "PCON";
43 	case DRM_LSPCON_MODE_LS:
44 		return "LS";
45 	case DRM_LSPCON_MODE_INVALID:
46 		return "INVALID";
47 	default:
48 		MISSING_CASE(mode);
49 		return "INVALID";
50 	}
51 }
52 
53 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
54 {
55 	enum drm_lspcon_mode current_mode;
56 	struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
57 
58 	if (drm_lspcon_get_mode(adapter, &current_mode)) {
59 		DRM_DEBUG_KMS("Error reading LSPCON mode\n");
60 		return DRM_LSPCON_MODE_INVALID;
61 	}
62 	return current_mode;
63 }
64 
65 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
66 					     enum drm_lspcon_mode mode)
67 {
68 	enum drm_lspcon_mode current_mode;
69 
70 	current_mode = lspcon_get_current_mode(lspcon);
71 	if (current_mode == mode)
72 		goto out;
73 
74 	DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
75 		      lspcon_mode_name(mode));
76 
77 	wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 100);
78 	if (current_mode != mode)
79 		DRM_ERROR("LSPCON mode hasn't settled\n");
80 
81 out:
82 	DRM_DEBUG_KMS("Current LSPCON mode %s\n",
83 		      lspcon_mode_name(current_mode));
84 
85 	return current_mode;
86 }
87 
88 static int lspcon_change_mode(struct intel_lspcon *lspcon,
89 			      enum drm_lspcon_mode mode)
90 {
91 	int err;
92 	enum drm_lspcon_mode current_mode;
93 	struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
94 
95 	err = drm_lspcon_get_mode(adapter, &current_mode);
96 	if (err) {
97 		DRM_ERROR("Error reading LSPCON mode\n");
98 		return err;
99 	}
100 
101 	if (current_mode == mode) {
102 		DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
103 		return 0;
104 	}
105 
106 	err = drm_lspcon_set_mode(adapter, mode);
107 	if (err < 0) {
108 		DRM_ERROR("LSPCON mode change failed\n");
109 		return err;
110 	}
111 
112 	lspcon->mode = mode;
113 	DRM_DEBUG_KMS("LSPCON mode changed done\n");
114 	return 0;
115 }
116 
117 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
118 {
119 	uint8_t rev;
120 
121 	if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
122 			      &rev) != 1) {
123 		DRM_DEBUG_KMS("Native AUX CH down\n");
124 		return false;
125 	}
126 
127 	DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
128 		      rev >> 4, rev & 0xf);
129 
130 	return true;
131 }
132 
133 static bool lspcon_probe(struct intel_lspcon *lspcon)
134 {
135 	int retry;
136 	enum drm_dp_dual_mode_type adaptor_type;
137 	struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
138 	enum drm_lspcon_mode expected_mode;
139 
140 	expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
141 			DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
142 
143 	/* Lets probe the adaptor and check its type */
144 	for (retry = 0; retry < 6; retry++) {
145 		if (retry)
146 			usleep_range(500, 1000);
147 
148 		adaptor_type = drm_dp_dual_mode_detect(adapter);
149 		if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
150 			break;
151 	}
152 
153 	if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
154 		DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
155 			       drm_dp_get_dual_mode_type_name(adaptor_type));
156 		return false;
157 	}
158 
159 	/* Yay ... got a LSPCON device */
160 	DRM_DEBUG_KMS("LSPCON detected\n");
161 	lspcon->mode = lspcon_wait_mode(lspcon, expected_mode);
162 	lspcon->active = true;
163 	return true;
164 }
165 
166 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
167 {
168 	struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
169 	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
170 	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
171 	unsigned long start = jiffies;
172 
173 	while (1) {
174 		if (intel_digital_port_connected(dev_priv, dig_port)) {
175 			DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %lu ms\n",
176 				      jiffies_to_msecs(jiffies - start));
177 			return;
178 		}
179 
180 		if (time_after(jiffies, start + msecs_to_jiffies(1000)))
181 			break;
182 
183 		usleep_range(10000, 15000);
184 	}
185 
186 	DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
187 }
188 
189 void lspcon_resume(struct intel_lspcon *lspcon)
190 {
191 	enum drm_lspcon_mode expected_mode;
192 
193 	if (lspcon_wake_native_aux_ch(lspcon)) {
194 		expected_mode = DRM_LSPCON_MODE_PCON;
195 		lspcon_resume_in_pcon_wa(lspcon);
196 	} else {
197 		expected_mode = DRM_LSPCON_MODE_LS;
198 	}
199 
200 	if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
201 		return;
202 
203 	if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
204 		DRM_ERROR("LSPCON resume failed\n");
205 	else
206 		DRM_DEBUG_KMS("LSPCON resume success\n");
207 }
208 
209 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
210 {
211 	lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
212 }
213 
214 bool lspcon_init(struct intel_digital_port *intel_dig_port)
215 {
216 	struct intel_dp *dp = &intel_dig_port->dp;
217 	struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
218 	struct drm_device *dev = intel_dig_port->base.base.dev;
219 	struct drm_i915_private *dev_priv = to_i915(dev);
220 
221 	if (!HAS_LSPCON(dev_priv)) {
222 		DRM_ERROR("LSPCON is not supported on this platform\n");
223 		return false;
224 	}
225 
226 	lspcon->active = false;
227 	lspcon->mode = DRM_LSPCON_MODE_INVALID;
228 
229 	if (!lspcon_probe(lspcon)) {
230 		DRM_ERROR("Failed to probe lspcon\n");
231 		return false;
232 	}
233 
234 	/*
235 	* In the SW state machine, lets Put LSPCON in PCON mode only.
236 	* In this way, it will work with both HDMI 1.4 sinks as well as HDMI
237 	* 2.0 sinks.
238 	*/
239 	if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) {
240 		if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) {
241 			DRM_ERROR("LSPCON mode change to PCON failed\n");
242 			return false;
243 		}
244 	}
245 
246 	if (!intel_dp_read_dpcd(dp)) {
247 		DRM_ERROR("LSPCON DPCD read failed\n");
248 		return false;
249 	}
250 
251 	drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
252 
253 	DRM_DEBUG_KMS("Success: LSPCON init\n");
254 	return true;
255 }
256