linux-kernel - Re: [PATCH v3 02/17] drm/bridge: Verify lane assignment is going to work during atomic

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Message-ID: <ZsTPuvoTIFVFHw6o@smile.fi.intel.com>
Date: Tue, 20 Aug 2024 20:17:46 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Stephen Boyd <swboyd@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev, devicetree@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	Guenter Roeck <groeck@...omium.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
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	Lee Jones <lee@...nel.org>,
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	linux-usb@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v3 02/17] drm/bridge: Verify lane assignment is going to
 work during atomic_check

On Tue, Aug 20, 2024 at 10:12:55AM -0700, Stephen Boyd wrote:
> Quoting Andy Shevchenko (2024-08-20 03:09:29)
> > On Mon, Aug 19, 2024 at 03:38:16PM -0700, Stephen Boyd wrote:

...

> > Yeah, I really think that the appearance of this thousandth time in the Git
> > history has almost no value and just pollutes the commit message makes it not
> > very well readable. The only outcome is exercising the compression algo used
> > by Git.
> 
> I'll leave the decision up to the maintainers.

Sure!

...

> > > +     /*
> > > +      * Ensure this bridge is aware that the next bridge wants to
> > > +      * reassign lanes.
> > > +      */
> > > +     for (i = 0; i < num_input_lanes; i++)
> > > +             if (i != input_lanes[i].logical && !num_output_lanes)
> > > +                     return -ENOTSUPP;
> >
> > Besides missing {} this code is internal to the Linux kernel. Is it okay?
> 
> ENOTSUPP is used by select_bus_fmt_recursive() so I simply followed that
> style.

Okay, just be aware of that side effect of that code, also checkpatch may
complain (however it might be false positive).

-- 
With Best Regards,
Andy Shevchenko