linux-kernel - Re: [PATCH v3 1/3] drm: add bus_formats and nbus_formats fields to drm_display

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Message-ID: <20141130133911.2daef8f4@bbrezillon>
Date:	Sun, 30 Nov 2014 13:39:11 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	Thierry Reding <thierry.reding@...il.com>,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH v3 1/3] drm: add bus_formats and nbus_formats fields to
 drm_display_info

Hi Laurent,

On Sat, 29 Nov 2014 00:13:47 +0200
Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:

> Hi Boris,
> 
> Thank you for the patch. I just have two small comments.
> 
> On Tuesday 18 November 2014 14:46:18 Boris Brezillon wrote:
> > Add bus_formats and nbus_formats fields and
> > drm_display_info_set_bus_formats helper function to specify the bus
> > formats supported by a given display.
> > 
> > This information can be used by display controller drivers to configure
> > the output interface appropriately (i.e. RGB565, RGB666 or RGB888 on raw
> > RGB or LVDS busses).
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> > ---
> >  drivers/gpu/drm/drm_crtc.c | 30 ++++++++++++++++++++++++++++++
> >  include/drm/drm_crtc.h     |  7 +++++++
> >  2 files changed, 37 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> > index e79c8d3..17e3acf 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -763,6 +763,36 @@ static void drm_mode_remove(struct drm_connector
> > *connector, drm_mode_destroy(connector->dev, mode);
> >  }
> > 
> > +/*
> > + * drm_display_info_set_bus_formats - set the supported bus formats
> > + * @info: display info to store bus formats in
> > + * @fmts: array containing the supported bus formats
> > + * @nfmts: the number of entries in the fmts array
> > + *
> > + * Store the suppported bus formats in display info structure.
> 
> Could you document that the formats are specified as MEDIA_BUS_FMT_* values ?

Sure, I'll clearly state that.

> 
> > + */
> > +int drm_display_info_set_bus_formats(struct drm_display_info *info, const
> > u32 *fmts, +				     unsigned int num_fmts)
> > +{
> > +	u32 *formats = NULL;
> > +
> > +	if (!fmts && num_fmts)
> > +		return -EINVAL;
> > +
> > +	if (fmts && num_fmts) {
> > +		formats = kmemdup(fmts, sizeof(*fmts) * num_fmts, GFP_KERNEL);
> > +		if (!formats)
> > +			return -ENOMEM;
> > +	}
> > +
> > +	kfree(info->bus_formats);
> > +	info->bus_formats = formats;
> > +	info->num_bus_formats = num_fmts;
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL(drm_display_info_set_bus_formats);
> > +
> >  /**
> >   * drm_connector_get_cmdline_mode - reads the user's cmdline mode
> >   * @connector: connector to quwery
> > diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> > index c40070a..2e0a3e8 100644
> > --- a/include/drm/drm_crtc.h
> > +++ b/include/drm/drm_crtc.h
> > @@ -31,6 +31,7 @@
> >  #include <linux/idr.h>
> >  #include <linux/fb.h>
> >  #include <linux/hdmi.h>
> > +#include <linux/media-bus-format.h>
> >  #include <uapi/drm/drm_mode.h>
> >  #include <uapi/drm/drm_fourcc.h>
> >  #include <drm/drm_modeset_lock.h>
> > @@ -130,6 +131,9 @@ struct drm_display_info {
> >  	enum subpixel_order subpixel_order;
> >  	u32 color_formats;
> > 
> > +	const u32 *bus_formats;
> > +	int num_bus_formats;
> 
> As the number of formats is never negative, I would make it an unsigned int.

Okay, I'll make it an unsigned int.

Regards,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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