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1 From b3212eba63b541206e12c8dc31fc0d99d916b210 Mon Sep 17 00:00:00 2001
2 From: Hans de Goede <hdegoede@redhat.com>
3 Date: Mon, 18 Nov 2019 16:51:29 +0100
4 Subject: [PATCH] drm/modes: parse_cmdline: Allow specifying
5 stand-alone options
6
7 Commit 7b1cce760afe38b40f0989cdf10b2190dccf9815 upstream.
8
9 Some options which can be specified on the commandline, such as
10 margin_right=..., margin_left=..., etc. are applied not only to the
11 specified mode, but to all modes. As such it would be nice if the user
12 can simply say e.g.
13 video=HDMI-1:margin_right=14,margin_left=24,margin_bottom=36,margin_top=42
14
15 This commit refactors drm_mode_parse_command_line_for_connector() to
16 add support for this, and as a nice side effect also cleans up the
17 function a bit.
18
19 Acked-by: Maxime Ripard <mripard@kernel.org>
20 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
21 Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-8-hdegoede@redhat.com
22 ---
23 drivers/gpu/drm/drm_modes.c | 92 +++++++------------
24 .../gpu/drm/selftests/drm_cmdline_selftests.h | 2 +
25 .../drm/selftests/test-drm_cmdline_parser.c | 50 ++++++++++
26 3 files changed, 86 insertions(+), 58 deletions(-)
27
28 --- a/drivers/gpu/drm/drm_modes.c
29 +++ b/drivers/gpu/drm/drm_modes.c
30 @@ -1677,17 +1677,6 @@ static const char * const drm_named_mode
31 "PAL",
32 };
33
34 -static bool drm_named_mode_is_in_whitelist(const char *mode, unsigned int size)
35 -{
36 - int i;
37 -
38 - for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++)
39 - if (!strncmp(mode, drm_named_modes_whitelist[i], size))
40 - return true;
41 -
42 - return false;
43 -}
44 -
45 /**
46 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
47 * @mode_option: optional per connector mode option
48 @@ -1718,7 +1707,7 @@ bool drm_mode_parse_command_line_for_con
49 struct drm_cmdline_mode *mode)
50 {
51 const char *name;
52 - bool named_mode = false, parse_extras = false;
53 + bool freestanding = false, parse_extras = false;
54 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
55 unsigned int mode_end = 0;
56 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
57 @@ -1738,49 +1727,14 @@ bool drm_mode_parse_command_line_for_con
58
59 name = mode_option;
60
61 - /*
62 - * This is a bit convoluted. To differentiate between the
63 - * named modes and poorly formatted resolutions, we need a
64 - * bunch of things:
65 - * - We need to make sure that the first character (which
66 - * would be our resolution in X) is a digit.
67 - * - If not, then it's either a named mode or a force on/off.
68 - * To distinguish between the two, we need to run the
69 - * extra parsing function, and if not, then we consider it
70 - * a named mode.
71 - *
72 - * If this isn't enough, we should add more heuristics here,
73 - * and matching unit-tests.
74 - */
75 - if (!isdigit(name[0]) && name[0] != 'x') {
76 - unsigned int namelen = strlen(name);
77 -
78 - /*
79 - * Only the force on/off options can be in that case,
80 - * and they all take a single character.
81 - */
82 - if (namelen == 1) {
83 - ret = drm_mode_parse_cmdline_extra(name, namelen, true,
84 - connector, mode);
85 - if (!ret)
86 - return true;
87 - }
88 -
89 - named_mode = true;
90 - }
91 -
92 /* Try to locate the bpp and refresh specifiers, if any */
93 bpp_ptr = strchr(name, '-');
94 if (bpp_ptr)
95 bpp_off = bpp_ptr - name;
96
97 refresh_ptr = strchr(name, '@');
98 - if (refresh_ptr) {
99 - if (named_mode)
100 - return false;
101 -
102 + if (refresh_ptr)
103 refresh_off = refresh_ptr - name;
104 - }
105
106 /* Locate the start of named options */
107 options_ptr = strchr(name, ',');
108 @@ -1800,23 +1754,45 @@ bool drm_mode_parse_command_line_for_con
109 parse_extras = true;
110 }
111
112 - if (named_mode) {
113 - if (mode_end + 1 > DRM_DISPLAY_MODE_LEN)
114 - return false;
115 -
116 - if (!drm_named_mode_is_in_whitelist(name, mode_end))
117 - return false;
118 + /* First check for a named mode */
119 + for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
120 + ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
121 + if (ret == mode_end) {
122 + if (refresh_ptr)
123 + return false; /* named + refresh is invalid */
124 +
125 + strcpy(mode->name, drm_named_modes_whitelist[i]);
126 + mode->specified = true;
127 + break;
128 + }
129 + }
130
131 - strscpy(mode->name, name, mode_end + 1);
132 - } else {
133 + /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
134 + if (!mode->specified && isdigit(name[0])) {
135 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
136 parse_extras,
137 connector,
138 mode);
139 if (ret)
140 return false;
141 +
142 + mode->specified = true;
143 + }
144 +
145 + /* No mode? Check for freestanding extras and/or options */
146 + if (!mode->specified) {
147 + unsigned int len = strlen(mode_option);
148 +
149 + if (bpp_ptr || refresh_ptr)
150 + return false; /* syntax error */
151 +
152 + if (len == 1 || (len >= 2 && mode_option[1] == ','))
153 + extra_ptr = mode_option;
154 + else
155 + options_ptr = mode_option - 1;
156 +
157 + freestanding = true;
158 }
159 - mode->specified = true;
160
161 if (bpp_ptr) {
162 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
163 @@ -1852,7 +1828,7 @@ bool drm_mode_parse_command_line_for_con
164 else
165 len = strlen(extra_ptr);
166
167 - ret = drm_mode_parse_cmdline_extra(extra_ptr, len, false,
168 + ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
169 connector, mode);
170 if (ret)
171 return false;
172 @@ -1860,7 +1836,7 @@ bool drm_mode_parse_command_line_for_con
173
174 if (options_ptr) {
175 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
176 - false,
177 + freestanding,
178 connector, mode);
179 if (ret)
180 return false;
181 --- a/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
182 +++ b/drivers/gpu/drm/selftests/drm_cmdline_selftests.h
183 @@ -62,3 +62,5 @@ cmdline_test(drm_cmdline_test_multiple_o
184 cmdline_test(drm_cmdline_test_invalid_option)
185 cmdline_test(drm_cmdline_test_bpp_extra_and_option)
186 cmdline_test(drm_cmdline_test_extra_and_option)
187 +cmdline_test(drm_cmdline_test_freestanding_options)
188 +cmdline_test(drm_cmdline_test_freestanding_force_e_and_options)
189 --- a/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
190 +++ b/drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
191 @@ -1042,6 +1042,56 @@ static int drm_cmdline_test_extra_and_op
192 return 0;
193 }
194
195 +static int drm_cmdline_test_freestanding_options(void *ignored)
196 +{
197 + struct drm_cmdline_mode mode = { };
198 +
199 + FAIL_ON(!drm_mode_parse_command_line_for_connector("margin_right=14,margin_left=24,margin_bottom=36,margin_top=42",
200 + &no_connector,
201 + &mode));
202 + FAIL_ON(mode.specified);
203 + FAIL_ON(mode.refresh_specified);
204 + FAIL_ON(mode.bpp_specified);
205 +
206 + FAIL_ON(mode.tv_margins.right != 14);
207 + FAIL_ON(mode.tv_margins.left != 24);
208 + FAIL_ON(mode.tv_margins.bottom != 36);
209 + FAIL_ON(mode.tv_margins.top != 42);
210 +
211 + FAIL_ON(mode.rb);
212 + FAIL_ON(mode.cvt);
213 + FAIL_ON(mode.interlace);
214 + FAIL_ON(mode.margins);
215 + FAIL_ON(mode.force != DRM_FORCE_UNSPECIFIED);
216 +
217 + return 0;
218 +}
219 +
220 +static int drm_cmdline_test_freestanding_force_e_and_options(void *ignored)
221 +{
222 + struct drm_cmdline_mode mode = { };
223 +
224 + FAIL_ON(!drm_mode_parse_command_line_for_connector("e,margin_right=14,margin_left=24,margin_bottom=36,margin_top=42",
225 + &no_connector,
226 + &mode));
227 + FAIL_ON(mode.specified);
228 + FAIL_ON(mode.refresh_specified);
229 + FAIL_ON(mode.bpp_specified);
230 +
231 + FAIL_ON(mode.tv_margins.right != 14);
232 + FAIL_ON(mode.tv_margins.left != 24);
233 + FAIL_ON(mode.tv_margins.bottom != 36);
234 + FAIL_ON(mode.tv_margins.top != 42);
235 +
236 + FAIL_ON(mode.rb);
237 + FAIL_ON(mode.cvt);
238 + FAIL_ON(mode.interlace);
239 + FAIL_ON(mode.margins);
240 + FAIL_ON(mode.force != DRM_FORCE_ON);
241 +
242 + return 0;
243 +}
244 +
245 #include "drm_selftest.c"
246
247 static int __init test_drm_cmdline_init(void)
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