linux-kernel - Re: [PATCH 8/8] drm: connector: Remove DRM_BUS_FLAG_DATA

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Message-ID: <20180424072233.GF17088@w540>
Date:   Tue, 24 Apr 2018 09:22:33 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>, architt@...eaurora.org,
        a.hajda@...sung.com, airlied@...ux.ie, daniel@...ll.ch,
        peda@...ntia.se, linux-renesas-soc@...r.kernel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] drm: connector: Remove DRM_BUS_FLAG_DATA_* flags

Hi Laurent,

On Tue, Apr 24, 2018 at 12:03:04AM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Thursday, 19 April 2018 12:31:09 EEST Jacopo Mondi wrote:
> > DRM_BUS_FLAG_DATA_* flags, defined in drm_connector.h header file are
> > used to swap ordering of LVDS RGB format to accommodate DRM objects
> > that need to handle LVDS components ordering.
> >
> > Now that the only 2 users of DRM_BUS_FLAG_DATA_* flags have been ported
> > to use the newly introduced MEDIA_BUS_FMT_RGB888_1X7X*_LE media bus
> > formats, remove them.
>
> I'm not opposed to this (despite my review of patch 5/8), but I think the _LE
> suffix isn't the right name for the new formats. _BE and _LE relate to byte
> swapping, while here you really need to describe full mirroring. Maybe a
> _MIRROR variant would be more appropriate ?

As I anticipated in the cover letter, I agree the BE/LE distinction
does not apply well for LVDS formats. I chose to use _LE anyhow as
there are no other format variants defined in media-bus-format.h

I'm open to use either of those suffixes btw, what presses me is to
get rid of those flags only defined in drm_connector.h

thanks
   j

>
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > ---
> >  include/drm/drm_connector.h | 4 ----
> >  1 file changed, 4 deletions(-)
> >
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index 675cc3f..9e0d6d5 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -286,10 +286,6 @@ struct drm_display_info {
> >  #define DRM_BUS_FLAG_PIXDATA_POSEDGE	(1<<2)
> >  /* drive data on neg. edge */
> >  #define DRM_BUS_FLAG_PIXDATA_NEGEDGE	(1<<3)
> > -/* data is transmitted MSB to LSB on the bus */
> > -#define DRM_BUS_FLAG_DATA_MSB_TO_LSB	(1<<4)
> > -/* data is transmitted LSB to MSB on the bus */
> > -#define DRM_BUS_FLAG_DATA_LSB_TO_MSB	(1<<5)
> >
> >  	/**
> >  	 * @bus_flags: Additional information (like pixel signal polarity) for
>
>
> --
> Regards,
>
> Laurent Pinchart
>
>
>

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