linux-kernel - Re: [PATCH 3/5] drm: add bus_formats and nbus_formats fields to drm_display

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Date:	Tue, 23 Sep 2014 16:04:40 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 3/5] drm: add bus_formats and nbus_formats fields to
 drm_display_info

On Tue, Jul 22, 2014 at 02:23:45PM +0200, 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 | 28 ++++++++++++++++++++++++++++
>  include/drm/drm_crtc.h     |  8 ++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index c808a09..50c8395 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -825,6 +825,34 @@ 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.
> + */
> +int drm_display_info_set_bus_formats(struct drm_display_info *info,
> +				     const enum video_bus_format *fmts,
> +				     int nfmts)

Can you make nfmts unsigned please?

> +{
> +	enum video_bus_format *formats = NULL;
> +
> +	if (fmts && nfmts) {
> +		formats = kmemdup(fmts, sizeof(*fmts) * nfmts, GFP_KERNEL);
> +		if (!formats)
> +			return -ENOMEM;
> +	}
> +
> +	kfree(info->bus_formats);
> +	info->bus_formats = formats;
> +	info->nbus_formats = formats ? nfmts : 0;

And perhaps check for formats == NULL && nfmts != 0 since that's not a
valid pair of values. Then you can simply assign this directly without
relying on the value of formats.

Also other variable names use "num_" as a prefix instead of "n", so if
you're going to respin anyway might as well make the names more
consistent.

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_display_info_set_bus_formats);
> +
>  /**
>   * drm_connector_init - Init a preallocated connector
>   * @dev: DRM device
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index e529b68..957729b 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/video-bus-format.h>
>  #include <drm/drm_mode.h>
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_modeset_lock.h>
> @@ -121,6 +122,9 @@ struct drm_display_info {
>  	enum subpixel_order subpixel_order;
>  	u32 color_formats;
>  
> +	const enum video_bus_format *bus_formats;
> +	int nbus_formats;

unsigned int here too, please.

Thierry

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