linux-kernel - Re: [PATCH v2 4/6] drm/fourcc: Pass the format_info pointer to drm_format_plane

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Message-ID: <20190513131132.GN24299@intel.com>
Date:   Mon, 13 May 2019 16:11:32 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Emil Velikov <emil.velikov@...labora.com>
Subject: Re: [PATCH v2 4/6] drm/fourcc: Pass the format_info pointer to
 drm_format_plane_cpp

On Sun, May 12, 2019 at 07:30:54PM +0200, Maxime Ripard wrote:
> Hi Ville,
> 
> On Fri, May 10, 2019 at 07:00:31PM +0300, Ville Syrjälä wrote:
> > On Fri, May 10, 2019 at 01:08:49PM +0200, Maxime Ripard wrote:
> > > So far, the drm_format_plane_cpp function was operating on the format's
> > > fourcc and was doing a lookup to retrieve the drm_format_info structure and
> > > return the cpp.
> > >
> > > However, this is inefficient since in most cases, we will have the
> > > drm_format_info pointer already available so we shouldn't have to perform a
> > > new lookup. Some drm_fourcc functions also already operate on the
> > > drm_format_info pointer for that reason, so the API is quite inconsistent
> > > there.
> > >
> > > Let's follow the latter pattern and remove the extra lookup while being a
> > > bit more consistent. In order to be extra consistent, also rename that
> > > function to drm_format_info_plane_cpp and to a static function in the
> > > header to match the current policy.
> >
> > Is there any point keeping the function at all?
> > It's just info->cpp[i] no?
> 
> You're right, we can remove it.
> 
> Do you want this to be done in that patch or a subsequent one?

I don't mind either way.

-- 
Ville Syrjälä
Intel