linux-kernel - Re: [PATCH v1 07/35] drm/modes: Only consider bpp and refresh before options

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Message-ID: <20220816122056.w6suecaizdoss2sv@houat>
Date:   Tue, 16 Aug 2022 14:20:56 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Phil Elwell <phil@...pberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v1 07/35] drm/modes: Only consider bpp and refresh before
 options

Hi Geert,

Thanks for your review

On Fri, Aug 12, 2022 at 03:25:39PM +0200, Geert Uytterhoeven wrote:
> Hi Maxime,
> 
> On Fri, Jul 29, 2022 at 6:35 PM Maxime Ripard <maxime@...no.tech> wrote:
> > Some video= options might have a value that contains a dash. However, the
> > command line parsing mode considers all dashes as the separator between the
> > mode and the bpp count.
> >
> > Let's rework the parsing code a bit to only consider a dash as the bpp
> > separator if it before a comma, the options separator.
> >
> > A follow-up patch will add a unit-test for this once such an option is
> > introduced.
> >
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
> 
> Thanks for your patch!
> 
> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> 
> > --- a/drivers/gpu/drm/drm_modes.c
> > +++ b/drivers/gpu/drm/drm_modes.c
> > @@ -1819,20 +1819,22 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
> >
> >         name = mode_option;
> >
> > +       /* Locate the start of named options */
> > +       options_ptr = strchr(name, ',');
> > +       if (options_ptr)
> > +               options_off = options_ptr - name;
> > +       else
> > +               options_off = strlen(name);
> > +
> >         /* Try to locate the bpp and refresh specifiers, if any */
> > -       bpp_ptr = strchr(name, '-');
> > +       bpp_ptr = strnchr(name, options_off, '-');
> 
> Probably you still want to add a check that the next character
> is actually a digit, cfr. my "[PATCH v2 5/5] drm/modes:
> parse_cmdline: Add support for named modes containing dashes"
> (https://lore.kernel.org/dri-devel/2eb205da88c3cb19ddf04d167ece4e16a330948b.1657788997.git.geert@linux-m68k.org)?

I think your patch is orthogonal, and we should merge it anyway.

As a matter of fact, I initially wanted to do something similar but
bailed out to deal with PAL-M and so on. If there's such modes already,
then we should totally support it

Maxime

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