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

From: Fabrizio Castro
Date: Thu Aug 15 2019 - 11:40:14 EST


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@xxxxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxx>
> >
> > ---
> > 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