linux-kernel - RE: [PATCH v2 4/9] drm/timings: Add link flags

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Message-ID: <TYXPR01MB1775593360A56D72CAFE5AD4C0AC0@TYXPR01MB1775.jpnprd01.prod.outlook.com>
Date:   Thu, 15 Aug 2019 15:40:09 +0000
From:   Fabrizio Castro <fabrizio.castro@...renesas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>
Subject: RE: [PATCH v2 4/9] drm/timings: Add link flags

Hi Laurent,

Thank you for the feedback!

I think we need to come a conclusion on here:
https://patchwork.kernel.org/patch/11095547/

before taking the comments on this patch any further.

Thanks,
Fab

> From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Sent: 15 August 2019 13:00
> Subject: Re: [PATCH v2 4/9] drm/timings: Add link flags
> 
> Hi Fabrizio,
> 
> Thank you for the patch.
> 
> On Thu, Aug 15, 2019 at 12:04:28PM +0100, Fabrizio Castro wrote:
> > We need more information to describe dual-LVDS links, therefore
> > introduce link_flags.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
> >
> > ---
> > v1->v2:
> > * new patch
> >
> >  include/drm/drm_timings.h | 26 ++++++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/include/drm/drm_timings.h b/include/drm/drm_timings.h
> > index 4af8814..58fbf1b 100644
> > --- a/include/drm/drm_timings.h
> > +++ b/include/drm/drm_timings.h
> > @@ -1,4 +1,6 @@
> >  /*
> > + * Copyright (C) 2019 Renesas Electronics Corporation
> > + *
> >   * Permission to use, copy, modify, distribute, and sell this software and its
> >   * documentation for any purpose is hereby granted without fee, provided that
> >   * the above copyright notice appear in all copies and that both that copyright
> > @@ -21,6 +23,24 @@
> >  #ifndef __DRM_TIMINGS_H__
> >  #define __DRM_TIMINGS_H__
> >
> > +#include <linux/bits.h>
> > +
> > +/**
> > + * enum drm_link_flags - link_flags for &drm_timings
> > + *
> > + * This enum defines the details of the link.
> > + *
> > + * @DRM_LINK_DUAL_LVDS_ODD_EVEN:	Dual-LVDS link, with odd pixels (1,3,5,
> > + *					etc.) coming through the first port, and
> > + *					even pixels (0,2,4,etc.) coming through
> > + *					the second port. If not specified for a
> > + *					dual-LVDS panel, it is assumed that even
> > + *					pixels are coming through the first port
> > + */
> > +enum drm_link_flags {
> 
> The text will be easier to read if you inline it here.
> 
> 	/**
> 	 * @DRM_LINK_DUAL_LVDS_ODD_EVEN: Dual-LVDS link, with odd pixels (1,3,5,
> 	 * etc.) coming through the first port, and  even pixels (0,2,4,etc.)
> 	 ...
> 
> > +	DRM_LINK_DUAL_LVDS_ODD_EVEN = BIT(0),
> 
> I would remove the dual_link field and add a DRM_LINK_DUAL_LVDS (or
> alternatively two flags, dual lvds odd-even and dual lvds even-odd).
> 
> > +};
> > +
> >  /**
> >   * struct drm_timings - timing information
> >   */
> > @@ -55,6 +75,12 @@ struct drm_timings {
> >  	 * and odd-numbered pixels are received on separate links.
> >  	 */
> >  	bool dual_link;
> > +	/**
> > +	 * @link_flags
> > +	 *
> > +	 * Provides detailed information about the link.
> 
> I think this calls for a bit more information than "detailed
> information". What information do you want to store in this field ?
> 
> > +	 */
> > +	enum drm_link_flags link_flags;
> >  };
> >
> >  #endif /* __DRM_TIMINGS_H__ */
> > --
> > 2.7.4
> >
> 
> --
> Regards,
> 
> Laurent Pinchart