target/linux/bcm27xx/patches-5.4/950-0483-drm-modes-parse_cmdline-Rework-drm_mode_parse_cmdlin.patch

   1 From 5b6257773b43e7a7b28f86359d2e9ebe15346b78 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Mon, 18 Nov 2019 16:51:26 +0100
   4 Subject: [PATCH] drm/modes: parse_cmdline: Rework
   5  drm_mode_parse_cmdline_options()
   6
   7 Commit 739b200c2edcaaa7a86f37b0c11db57956433dfb upstream.
   8
   9 Refactor drm_mode_parse_cmdline_options() so that it takes a pointer
  10 to the first option, rather then a pointer to the ',' before the first
  11 option.
  12
  13 This is a preparation patch for allowing parsing of stand-alone options
  14 without a mode before them, e.g.: video=HDMI-1:margin_right=14,...
  15
  16 Acked-by: Maxime Ripard <mripard@kernel.org>
  17 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  18 Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-5-hdegoede@redhat.com
  19 ---
  20  drivers/gpu/drm/drm_modes.c | 21 +++++++++------------
  21  1 file changed, 9 insertions(+), 12 deletions(-)
  22
  23 --- a/drivers/gpu/drm/drm_modes.c
  24 +++ b/drivers/gpu/drm/drm_modes.c
  25 @@ -1591,23 +1591,21 @@ static int drm_mode_parse_cmdline_int(co
  26         return 0;
  27  }
  28
  29 -static int drm_mode_parse_cmdline_options(const char *str, size_t len,
  30 +static int drm_mode_parse_cmdline_options(const char *str,
  31                                           const struct drm_connector *connector,
  32                                           struct drm_cmdline_mode *mode)
  33  {
  34         unsigned int deg, margin, rotation = 0;
  35 -       const char *sep = str;
  36 +       const char *delim, *option, *sep;
  37
  38 -       while ((sep = strchr(sep, ','))) {
  39 -               const char *delim, *option;
  40 -
  41 -               option = sep + 1;
  42 +       option = str;
  43 +       do {
  44                 delim = strchr(option, '=');
  45                 if (!delim) {
  46                         delim = strchr(option, ',');
  47
  48                         if (!delim)
  49 -                               delim = str + len;
  50 +                               delim = option + strlen(option);
  51                 }
  52
  53                 if (!strncmp(option, "rotate", delim - option)) {
  54 @@ -1661,8 +1659,9 @@ static int drm_mode_parse_cmdline_option
  55                 } else {
  56                         return -EINVAL;
  57                 }
  58 -               sep = delim;
  59 -       }
  60 +               sep = strchr(delim, ',');
  61 +               option = sep + 1;
  62 +       } while (sep);
  63
  64         if (!(rotation & DRM_MODE_ROTATE_MASK))
  65                 rotation |= DRM_MODE_ROTATE_0;
  66 @@ -1862,9 +1861,7 @@ bool drm_mode_parse_command_line_for_con
  67         }
  68
  69         if (options_ptr) {
  70 -               int len = strlen(name) - (options_ptr - name);
  71 -
  72 -               ret = drm_mode_parse_cmdline_options(options_ptr, len,
  73 +               ret = drm_mode_parse_cmdline_options(options_ptr + 1,
  74                                                      connector, mode);
  75                 if (ret)
  76                         return false;