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drm/ast: fix EDID memory leak
[deliverable/linux.git] / drivers / gpu / drm / drm_edid_load.c
CommitLineData
da0df92b
CE		 1/*
2 drm_edid_load.c: use a built-in EDID data set or load it via the firmware
3 interface
4
5 Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
6
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License
9 as published by the Free Software Foundation; either version 2
10 of the License, or (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20*/
21
22#include <linux/module.h>
23#include <linux/firmware.h>
24#include "drmP.h"
25#include "drm_crtc.h"
26#include "drm_crtc_helper.h"
27#include "drm_edid.h"
28
29static char edid_firmware[PATH_MAX];
30module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
31MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
32 "from built-in data or /lib/firmware instead. ");
33
34#define GENERIC_EDIDS 4
35static char *generic_edid_name[GENERIC_EDIDS] = {
36 "edid/1024x768.bin",
37 "edid/1280x1024.bin",
38 "edid/1680x1050.bin",
39 "edid/1920x1080.bin",
40};
41
42static u8 generic_edid[GENERIC_EDIDS][128] = {
43 {
44 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
45 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
47 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
48 0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
49 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
50 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
51 0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
52 0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
53 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
54 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
55 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
56 0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
57 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
58 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
59 0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
60 },
61 {
62 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
63 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
65 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
66 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
67 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
69 0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
70 0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
71 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
72 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
73 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
74 0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
75 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
76 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
77 0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
78 },
79 {
80 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
81 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
82 0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
83 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
84 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
85 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
86 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
87 0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
88 0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
89 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
90 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
91 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
92 0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
93 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
94 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
95 0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
96 },
97 {
98 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
99 0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
100 0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
101 0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
102 0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
103 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
105 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
106 0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
107 0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
108 0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
109 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
110 0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
111 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
112 0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
113 0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
114 },
115};
116
117static int edid_load(struct drm_connector *connector, char *name,
118 char *connector_name)
119{
120 const struct firmware *fw;
121 struct platform_device *pdev;
f7b83b90 122 u8 *fwdata = NULL, *edid, *new_edid;
da0df92b
CE		 123 int fwsize, expected;
124 int builtin = 0, err = 0;
125 int i, valid_extensions = 0;
126
127 pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
128 if (IS_ERR(pdev)) {
129 DRM_ERROR("Failed to register EDID firmware platform device "
130 "for connector \"%s\"\n", connector_name);
131 err = -EINVAL;
132 goto out;
133 }
134
135 err = request_firmware(&fw, name, &pdev->dev);
136 platform_device_unregister(pdev);
137
138 if (err) {
139 i = 0;
140 while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i]))
141 i++;
142 if (i < GENERIC_EDIDS) {
143 err = 0;
144 builtin = 1;
145 fwdata = generic_edid[i];
146 fwsize = sizeof(generic_edid[i]);
147 }
148 }
149
150 if (err) {
151 DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
152 name, err);
153 goto out;
154 }
155
156 if (fwdata == NULL) {
157 fwdata = (u8 *) fw->data;
158 fwsize = fw->size;
159 }
160
161 expected = (fwdata[0x7e] + 1) * EDID_LENGTH;
162 if (expected != fwsize) {
163 DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
164 "(expected %d, got %d)\n", name, expected, (int) fwsize);
165 err = -EINVAL;
166 goto relfw_out;
167 }
168
169 edid = kmalloc(fwsize, GFP_KERNEL);
170 if (edid == NULL) {
171 err = -ENOMEM;
172 goto relfw_out;
173 }
174 memcpy(edid, fwdata, fwsize);
175
2baf8377 176 if (!drm_edid_block_valid(edid, 0)) {
da0df92b
CE		 177 DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
178 name);
179 kfree(edid);
180 err = -EINVAL;
181 goto relfw_out;
182 }
183
184 for (i = 1; i <= edid[0x7e]; i++) {
185 if (i != valid_extensions + 1)
186 memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
187 edid + i * EDID_LENGTH, EDID_LENGTH);
2baf8377 188 if (drm_edid_block_valid(edid + i * EDID_LENGTH, i))
da0df92b
CE		 189 valid_extensions++;
190 }
191
192 if (valid_extensions != edid[0x7e]) {
193 edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
194 DRM_INFO("Found %d valid extensions instead of %d in EDID data "
195 "\"%s\" for connector \"%s\"\n", valid_extensions,
196 edid[0x7e], name, connector_name);
197 edid[0x7e] = valid_extensions;
f7b83b90 198 new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
da0df92b 199 GFP_KERNEL);
f7b83b90 200 if (new_edid == NULL) {
da0df92b 201 err = -ENOMEM;
f7b83b90 202 kfree(edid);
da0df92b
CE		 203 goto relfw_out;
204 }
f7b83b90 205 edid = new_edid;
da0df92b
CE		 206 }
207
208 connector->display_info.raw_edid = edid;
209 DRM_INFO("Got %s EDID base block and %d extension%s from "
210 "\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
211 "external", valid_extensions, valid_extensions == 1 ? "" : "s",
212 name, connector_name);
213
214relfw_out:
215 release_firmware(fw);
216
217out:
218 return err;
219}
220
221int drm_load_edid_firmware(struct drm_connector *connector)
222{
223 char *connector_name = drm_get_connector_name(connector);
224 char *edidname = edid_firmware, *last, *colon;
4a1b0714 225 int ret;
da0df92b
CE		 226
227 if (*edidname == '\0')
4a1b0714 228 return 0;
da0df92b
CE		 229
230 colon = strchr(edidname, ':');
231 if (colon != NULL) {
232 if (strncmp(connector_name, edidname, colon - edidname))
4a1b0714 233 return 0;
da0df92b
CE		 234 edidname = colon + 1;
235 if (*edidname == '\0')
4a1b0714 236 return 0;
da0df92b
CE		 237 }
238
239 last = edidname + strlen(edidname) - 1;
240 if (*last == '\n')
241 *last = '\0';
242
243 ret = edid_load(connector, edidname, connector_name);
244 if (ret)
245 return 0;
246
247 drm_mode_connector_update_edid_property(connector,
248 (struct edid *) connector->display_info.raw_edid);
249
250 return drm_add_edid_modes(connector, (struct edid *)
251 connector->display_info.raw_edid);
252}
Linux kernel - Deliverables
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