From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Petr Mladek <pmladek@suse.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
dri-devel@lists.freedesktop.org, hverkuil@xs4all.nl,
laurent.pinchart@ideasonboard.com, mchehab@kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joe Perches <joe@perches.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>
Subject: Re: [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs
Date: Mon, 15 Feb 2021 19:21:03 +0200 [thread overview]
Message-ID: <20210215172103.GJ3@paasikivi.fi.intel.com> (raw)
In-Reply-To: <YCqmnG9r2gogFPsH@alley>
Hi Petr,
On Mon, Feb 15, 2021 at 05:51:40PM +0100, Petr Mladek wrote:
> On Mon 2021-02-15 17:54:47, Andy Shevchenko wrote:
> > On Mon, Feb 15, 2021 at 03:56:50PM +0200, Sakari Ailus wrote:
> > > On Mon, Feb 15, 2021 at 03:31:29PM +0200, Andy Shevchenko wrote:
> > > > On Mon, Feb 15, 2021 at 01:40:28PM +0200, Sakari Ailus wrote:
> > > > > Add a printk modifier %p4cc (for pixel format) for printing V4L2 and DRM
> > > > > pixel formats denoted by fourccs. The fourcc encoding is the same for both
> > > > > so the same implementation can be used.
> > > >
> > > > This version I almost like, feel free to add
> > > > Reviewed-by: From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > > after considering addressing below nit-picks.
> >
> > > > > +Examples::
> > > > > +
> > > > > + %p4cc BG12 little-endian (0x32314742)
> > > >
> > > > No examples with spaces / non-printable / non-ascii characters
> > >
> > > I can sure add an example that has a space. But do you think I really
> > > should add an example where invalid information is being printed?
> >
> > I think you have to provide better coverage of what user can get out of this.
> > Perhaps one example with space and non-printable character is enough.
> >
> > > > > + char output[sizeof("1234 little-endian (0x01234567)")];
> > > >
> > > > 1234 -> ABCD ? (Or XY12 to be closer to the reality)
> > >
> > > I count in numbers... albeit the hexadecimal number there starts from zero.
> > >
> > > I guess both would work though.
> > >
> > > 0123 would be consistent.
> >
> > Since letters can be printed the above is confusing a bit. I think XY12 is
> > closer to the reality than 0123.
>
> Ailus, are you going to send v8 with the two small changes? I mean a
> selftest with the space and the above sample code.
Yes, and a few more examples.
>
> Anyway, feel free to add:
>
> Reviewed-by: Petr Mladek <pmladek@suse.com>
Thank you.
It'd be great if we could merge this through the printk tree. Acks are
needed from the DRM people first.
--
Regards,
Sakari Ailus
next prev parent reply other threads:[~2021-02-15 17:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-15 11:40 [PATCH v7 0/3] Add %p4cc printk modifier for V4L2 and DRM fourcc codes Sakari Ailus
2021-02-15 11:40 ` [PATCH v7 1/3] lib/vsprintf: Add support for printing V4L2 and DRM fourccs Sakari Ailus
2021-02-15 13:31 ` Andy Shevchenko
2021-02-15 13:56 ` Sakari Ailus
2021-02-15 15:54 ` Andy Shevchenko
2021-02-15 16:51 ` Petr Mladek
2021-02-15 17:21 ` Sakari Ailus [this message]
2021-02-15 11:40 ` [PATCH v7 2/3] v4l: ioctl: Use %p4cc printk modifier to print FourCC codes Sakari Ailus
2021-02-15 13:34 ` Andy Shevchenko
2021-02-15 13:50 ` Sakari Ailus
2021-02-15 16:56 ` Petr Mladek
2021-02-15 17:05 ` Mauro Carvalho Chehab
2021-02-15 17:22 ` Sakari Ailus
2021-02-15 11:40 ` [PATCH v7 3/3] drm: Switch to %p4cc format modifier Sakari Ailus
2021-02-15 13:41 ` Andy Shevchenko
2021-02-15 13:48 ` Sakari Ailus
2021-02-15 17:26 ` Sakari Ailus
2021-02-15 17:36 ` Andy Shevchenko
2021-02-15 16:58 ` Petr Mladek
2021-02-16 8:37 ` Thomas Zimmermann
2021-02-16 9:01 ` Sakari Ailus
2021-02-16 9:08 ` Petr Mladek
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