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drm/modes: Rewrite the command line parser
Rewrite the command line parser in order to get away from the state machine parsing the video mode lines. Hopefully, this will allow to extend it more easily to support named modes and / or properties set directly on the command line. Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/e32cd4009153b184103554009135c7bf7c9975d7.1560783090.git-series.maxime.ripard@bootlin.com
This commit is contained in:
Maxime Ripard
parent
a99076e87e
commit
e08ab74bd4
@ -30,6 +30,7 @@
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* authorization from the copyright holder(s) and author(s).
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*/
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#include <linux/ctype.h>
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#include <linux/list.h>
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#include <linux/list_sort.h>
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#include <linux/export.h>
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@ -1408,6 +1409,151 @@ void drm_connector_list_update(struct drm_connector *connector)
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}
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EXPORT_SYMBOL(drm_connector_list_update);
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static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
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struct drm_cmdline_mode *mode)
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{
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unsigned int bpp;
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if (str[0] != '-')
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return -EINVAL;
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str++;
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bpp = simple_strtol(str, end_ptr, 10);
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if (*end_ptr == str)
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return -EINVAL;
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mode->bpp = bpp;
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mode->bpp_specified = true;
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return 0;
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}
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static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
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struct drm_cmdline_mode *mode)
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{
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unsigned int refresh;
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if (str[0] != '@')
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return -EINVAL;
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str++;
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refresh = simple_strtol(str, end_ptr, 10);
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if (*end_ptr == str)
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return -EINVAL;
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mode->refresh = refresh;
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mode->refresh_specified = true;
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return 0;
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}
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static int drm_mode_parse_cmdline_extra(const char *str, int length,
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struct drm_connector *connector,
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struct drm_cmdline_mode *mode)
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{
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int i;
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for (i = 0; i < length; i++) {
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switch (str[i]) {
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case 'i':
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mode->interlace = true;
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break;
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case 'm':
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mode->margins = true;
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break;
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case 'D':
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if (mode->force != DRM_FORCE_UNSPECIFIED)
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return -EINVAL;
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if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
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(connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
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mode->force = DRM_FORCE_ON;
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else
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mode->force = DRM_FORCE_ON_DIGITAL;
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break;
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case 'd':
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if (mode->force != DRM_FORCE_UNSPECIFIED)
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return -EINVAL;
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mode->force = DRM_FORCE_OFF;
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break;
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case 'e':
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if (mode->force != DRM_FORCE_UNSPECIFIED)
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return -EINVAL;
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mode->force = DRM_FORCE_ON;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
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bool extras,
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struct drm_connector *connector,
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struct drm_cmdline_mode *mode)
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{
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const char *str_start = str;
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bool rb = false, cvt = false;
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int xres = 0, yres = 0;
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int remaining, i;
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char *end_ptr;
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xres = simple_strtol(str, &end_ptr, 10);
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if (end_ptr == str)
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return -EINVAL;
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if (end_ptr[0] != 'x')
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return -EINVAL;
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end_ptr++;
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str = end_ptr;
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yres = simple_strtol(str, &end_ptr, 10);
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if (end_ptr == str)
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return -EINVAL;
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remaining = length - (end_ptr - str_start);
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if (remaining < 0)
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return -EINVAL;
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for (i = 0; i < remaining; i++) {
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switch (end_ptr[i]) {
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case 'M':
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cvt = true;
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break;
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case 'R':
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rb = true;
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break;
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default:
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/*
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* Try to pass that to our extras parsing
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* function to handle the case where the
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* extras are directly after the resolution
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*/
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if (extras) {
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int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
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1,
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connector,
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mode);
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if (ret)
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return ret;
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} else {
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return -EINVAL;
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}
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}
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}
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mode->xres = xres;
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mode->yres = yres;
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mode->cvt = cvt;
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mode->rb = rb;
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return 0;
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}
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/**
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* drm_mode_parse_command_line_for_connector - parse command line modeline for connector
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* @mode_option: optional per connector mode option
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@ -1434,13 +1580,12 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
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struct drm_cmdline_mode *mode)
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{
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const char *name;
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unsigned int namelen;
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bool res_specified = false, bpp_specified = false, refresh_specified = false;
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unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
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bool yres_specified = false, cvt = false, rb = false;
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bool interlace = false, margins = false, was_digit = false;
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int i;
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enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
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bool parse_extras = false;
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unsigned int bpp_off = 0, refresh_off = 0;
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unsigned int mode_end = 0;
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char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
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char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
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int ret;
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#ifdef CONFIG_FB
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if (!mode_option)
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@ -1453,127 +1598,77 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
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}
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name = mode_option;
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namelen = strlen(name);
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for (i = namelen-1; i >= 0; i--) {
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switch (name[i]) {
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case '@':
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if (!refresh_specified && !bpp_specified &&
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!yres_specified && !cvt && !rb && was_digit) {
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refresh = simple_strtol(&name[i+1], NULL, 10);
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refresh_specified = true;
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was_digit = false;
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} else
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goto done;
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break;
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case '-':
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if (!bpp_specified && !yres_specified && !cvt &&
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!rb && was_digit) {
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bpp = simple_strtol(&name[i+1], NULL, 10);
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bpp_specified = true;
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was_digit = false;
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} else
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goto done;
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break;
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case 'x':
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if (!yres_specified && was_digit) {
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yres = simple_strtol(&name[i+1], NULL, 10);
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yres_specified = true;
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was_digit = false;
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} else
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goto done;
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break;
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case '0' ... '9':
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was_digit = true;
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break;
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case 'M':
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if (yres_specified || cvt || was_digit)
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goto done;
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cvt = true;
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break;
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case 'R':
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if (yres_specified || cvt || rb || was_digit)
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goto done;
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rb = true;
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break;
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case 'm':
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if (cvt || yres_specified || was_digit)
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goto done;
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margins = true;
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break;
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case 'i':
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if (cvt || yres_specified || was_digit)
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goto done;
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interlace = true;
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break;
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case 'e':
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if (yres_specified || bpp_specified || refresh_specified ||
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was_digit || (force != DRM_FORCE_UNSPECIFIED))
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goto done;
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force = DRM_FORCE_ON;
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break;
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case 'D':
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if (yres_specified || bpp_specified || refresh_specified ||
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was_digit || (force != DRM_FORCE_UNSPECIFIED))
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goto done;
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if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
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(connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
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force = DRM_FORCE_ON;
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else
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force = DRM_FORCE_ON_DIGITAL;
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break;
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case 'd':
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if (yres_specified || bpp_specified || refresh_specified ||
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was_digit || (force != DRM_FORCE_UNSPECIFIED))
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goto done;
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force = DRM_FORCE_OFF;
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break;
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default:
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goto done;
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}
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}
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if (i < 0 && yres_specified) {
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char *ch;
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xres = simple_strtol(name, &ch, 10);
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if ((ch != NULL) && (*ch == 'x'))
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res_specified = true;
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else
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i = ch - name;
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} else if (!yres_specified && was_digit) {
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/* catch mode that begins with digits but has no 'x' */
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i = 0;
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}
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done:
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if (i >= 0) {
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pr_warn("[drm] parse error at position %i in video mode '%s'\n",
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i, name);
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mode->specified = false;
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if (!isdigit(name[0]))
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return false;
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}
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if (res_specified) {
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mode->specified = true;
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mode->xres = xres;
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mode->yres = yres;
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}
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if (refresh_specified) {
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mode->refresh_specified = true;
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mode->refresh = refresh;
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}
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if (bpp_specified) {
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/* Try to locate the bpp and refresh specifiers, if any */
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bpp_ptr = strchr(name, '-');
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if (bpp_ptr) {
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bpp_off = bpp_ptr - name;
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mode->bpp_specified = true;
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mode->bpp = bpp;
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}
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mode->rb = rb;
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mode->cvt = cvt;
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mode->interlace = interlace;
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mode->margins = margins;
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mode->force = force;
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refresh_ptr = strchr(name, '@');
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if (refresh_ptr) {
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refresh_off = refresh_ptr - name;
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mode->refresh_specified = true;
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}
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/* Locate the end of the name / resolution, and parse it */
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if (bpp_ptr && refresh_ptr) {
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mode_end = min(bpp_off, refresh_off);
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} else if (bpp_ptr) {
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mode_end = bpp_off;
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} else if (refresh_ptr) {
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mode_end = refresh_off;
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} else {
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mode_end = strlen(name);
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parse_extras = true;
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}
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ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
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parse_extras,
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connector,
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mode);
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if (ret)
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return false;
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mode->specified = true;
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if (bpp_ptr) {
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ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
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if (ret)
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return false;
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}
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if (refresh_ptr) {
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ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
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&refresh_end_ptr, mode);
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if (ret)
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return false;
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}
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/*
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* Locate the end of the bpp / refresh, and parse the extras
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* if relevant
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*/
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if (bpp_ptr && refresh_ptr)
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extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
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else if (bpp_ptr)
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extra_ptr = bpp_end_ptr;
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else if (refresh_ptr)
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extra_ptr = refresh_end_ptr;
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if (extra_ptr) {
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int remaining = strlen(name) - (extra_ptr - name);
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/*
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* We still have characters to process, while
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* we shouldn't have any
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*/
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if (remaining > 0)
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return false;
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}
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return true;
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}
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