linux-kernel - Re: [PATCH 3/3] drm/bridge: Add NWL MIPI DSI host controller support

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Date:   Wed, 31 Jul 2019 18:54:00 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Fabio Estevam <festevam@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Lee Jones <lee.jones@...aro.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Robert Chiras <robert.chiras@....com>,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH 3/3] drm/bridge: Add NWL MIPI DSI host controller support

Hi,
On Wed, Jul 31, 2019 at 11:43:47AM -0300, Fabio Estevam wrote:
> Hi Guido,
> 
> On Wed, Jul 31, 2019 at 11:35 AM Guido Günther <agx@...xcpu.org> wrote:
> 
> > The idea is to have
> >
> >     "%sabling platform clocks", enable ? "en" : "dis");
> >
> > depending whether clocks are enabled/disabled.
> 
> Yes, I understood the idea, but this would print:
> 
> ensabling or dissabling :-)

The 's' is from the '%s' format specifier:

[ 2610.804174] imx-nwl-dsi 30a00000.mipi_dsi: [drm:imx_nwl_dsi_bridge_disable] disabling platform clocks
[ 2710.996279] imx-nwl-dsi 30a00000.mipi_dsi: [drm:imx_nwl_dsi_bridge_pre_enable] enabling platform clocks

I'll change that to use the full strings though since i also had to look
twice to be sure there's no double 's'.

> 
> > > Same here. Please return 'int' instead.
> >
> > This is from drm_bridge_funcs so the prototype is fixed. I'm not sure
> > how what's the best way to bubble up fatal errors through the drm layer?
> 
> Ok, so let's not change this one.
> 
> > I went for DRM_DEV_ERROR() since that what i used in the rest of the
> > driver and these ones were omission. Hope that's o.k.
> 
> No strong preferences here. I just think dev_err() easier to type and shorter.
> 
> Thanks for this work!

Thanks again for having a look!
 -- Guido