Hi Maxime, On Fri, Jul 29, 2022 at 6:36 PM Maxime Ripard <maxime@xxxxxxxxxx> wrote: > The current construction of the named mode parsing doesn't allow to extend > it easily. Let's move it to a separate function so we can add more > parameters and modes. > > Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx> Thanks for your patch, which looks similar to my "[PATCH v2 2/5] drm/modes: Extract drm_mode_parse_cmdline_named_mode()" (https://lore.kernel.org/dri-devel/1371554419ae63cb54c2a377db0c1016fcf200bb.1657788997.git.geert@xxxxxxxxxxxxxx ;-) > --- a/drivers/gpu/drm/drm_modes.c > +++ b/drivers/gpu/drm/drm_modes.c > @@ -1773,6 +1773,28 @@ static const char * const drm_named_modes_whitelist[] = { > "PAL", > }; > > +static bool drm_mode_parse_cmdline_named_mode(const char *name, > + unsigned int name_end, > + struct drm_cmdline_mode *cmdline_mode) > +{ > + unsigned int i; > + > + for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) { > + int ret; > + > + ret = str_has_prefix(name, drm_named_modes_whitelist[i]); > + if (ret != name_end) > + continue; > + > + strcpy(cmdline_mode->name, drm_named_modes_whitelist[i]); > + cmdline_mode->specified = true; > + > + return true; > + } > + > + return false; What's the point in returning a value, if it is never checked? Just make this function return void? > +} > + > /** > * drm_mode_parse_command_line_for_connector - parse command line modeline for connector > * @mode_option: optional per connector mode option > @@ -1848,18 +1870,14 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option, > parse_extras = true; > } > > - /* First check for a named mode */ > - for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) { > - ret = str_has_prefix(name, drm_named_modes_whitelist[i]); > - if (ret == mode_end) { > - if (refresh_ptr) > - return false; /* named + refresh is invalid */ > + /* > + * Having a mode that starts by a letter (and thus is named) and > + * an at-sign (used to specify a refresh rate) is disallowed. > + */ > + if (!isdigit(name[0]) && refresh_ptr) This condition may have to be relaxed, if we want to support e.g. "hd720p@50", cfr. my comments on "[PATCH v1 05/35] drm/connector: Add TV standard property". > + return false; > > - strcpy(mode->name, drm_named_modes_whitelist[i]); > - mode->specified = true; > - break; > - } > - } > + drm_mode_parse_cmdline_named_mode(name, mode_end, mode); This call needs to be conditional on mode_end being non-zero, cfr. my patch "[PATCH v2 1/5] drm/modes: parse_cmdline: Handle empty mode name part" (https://lore.kernel.org/dri-devel/302d0737539daa2053134e8f24fdf37e3d939e1e.1657788997.git.geert@xxxxxxxxxxxxxx). > > /* No named mode? Check for a normal mode argument, e.g. 1024x768 */ > if (!mode->specified && isdigit(name[0])) { Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
