linux-kernel - Re: [PATCH 2/9] drm/bridge: tc358767: Simplify tc_stream_clock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHQ1cqFq3-A7O4ywoAfqXmLk9i9q5D6h4Y0k8XjiGNUUDMc7Qw@mail.gmail.com>
Date:   Mon, 11 Mar 2019 10:51:56 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] drm/bridge: tc358767: Simplify tc_stream_clock_calc()

On Mon, Mar 4, 2019 at 4:20 AM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hello,
>
> On Mon, Mar 04, 2019 at 10:42:20AM +0100, Andrzej Hajda wrote:
> > On 26.02.2019 20:36, Andrey Smirnov wrote:
> > > Drop the use of tc_write() as well as "magicly" used "ret" and "err:"
> > > and replace it with a simple call to regmap_write(). No functional
> > > change intended.
> > >
> > > Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> > > Cc: Archit Taneja <architt@...eaurora.org>
> > > Cc: Andrzej Hajda <a.hajda@...sung.com>
> > > Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> > > Cc: Chris Healy <cphealy@...il.com>
> > > Cc: Lucas Stach <l.stach@...gutronix.de>
> > > Cc: dri-devel@...ts.freedesktop.org
> > > Cc: linux-kernel@...r.kernel.org
> > > ---
> > >  drivers/gpu/drm/bridge/tc358767.c | 7 +------
> > >  1 file changed, 1 insertion(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> > > index b0f8264a1285..86ebd49194b7 100644
> > > --- a/drivers/gpu/drm/bridge/tc358767.c
> > > +++ b/drivers/gpu/drm/bridge/tc358767.c
> > > @@ -504,7 +504,6 @@ static int tc_pxl_pll_dis(struct tc_data *tc)
> > >
> > >  static int tc_stream_clock_calc(struct tc_data *tc)
> > >  {
> > > -   int ret;
> > >     /*
> > >      * If the Stream clock and Link Symbol clock are
> > >      * asynchronous with each other, the value of M changes over
> > > @@ -520,11 +519,7 @@ static int tc_stream_clock_calc(struct tc_data *tc)
> > >      * M/N = f_STRMCLK / f_LSCLK
> > >      *
> > >      */
> > > -   tc_write(DP0_VIDMNGEN1, 32768);
> > > -
> > > -   return 0;
> > > -err:
> > > -   return ret;
> > > +   return regmap_write(tc->regmap, DP0_VIDMNGEN1, 32768);
> >
> >
> > The patch looks semantically correct, but you are dropping here custom
> > accessor (tc_write) in favor of regmap API.
> >
> > I think the best would be consistent across the whole driver: either use
> > only  accessors, either drop them entirely and use regmap API.
>
> I agree with this. The tc_write macro with its goto err is pretty nasty,
> and I'd like to see it removed from the whole driver, or at least
> replaced with an accessor that wouldn't hide the goto.
>
> > And it would be good to have comment of the original authors about this
> > change.
> >

OK, I'll create a patch to remove tc_write/read in v2 and add original
authors to CC.

Thanks,
Andrey Smirnov