linux-kernel - Re: [PATCH v2 3/7] drm_modes: add videomode_from_drm_display

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Date:	Fri, 19 Dec 2014 12:03:04 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Steve Longerbeam <slongerbeam@...il.com>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Denis Carikli <denis@...rea.com>,
	Jiada Wang <jiada_wang@...tor.com>,
	Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v2 3/7] drm_modes: add videomode_from_drm_display_mode

Am Donnerstag, den 18.12.2014, 18:00 -0800 schrieb Steve Longerbeam:
> Add conversion from drm_display_mode to videomode.
> 
> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> ---
>  drivers/gpu/drm/drm_modes.c |   40 ++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_modes.h     |    2 ++
>  2 files changed, 42 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 6d8b941..583a391 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -615,6 +615,46 @@ void drm_display_mode_from_videomode(const struct videomode *vm,
>  }
>  EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
>  
> +/**
> + * videomode_from_drm_display_mode - fill in @vm using @dmode,
> + * @dmode: drm_display_mode structure to use as source
> + * @vm: videomode structure to use as destination
> + *
> + * Fills out @vm using the display mode specified in @dmode.
> + */
> +void videomode_from_drm_display_mode(const struct drm_display_mode *dmode,
> +				     struct videomode *vm)
> +{
> +	vm->hactive = dmode->hdisplay;
> +	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
> +	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
> +	vm->hback_porch = dmode->htotal - dmode->hsync_end;
> +
> +	vm->vactive = dmode->vdisplay;
> +	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
> +	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
> +	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
> +
> +	vm->pixelclock = dmode->clock * 1000;
> +
> +	vm->flags = 0;
> +	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
> +		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
> +	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
> +		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
> +	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
> +		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
> +	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
> +		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
> +	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
> +		vm->flags |= DISPLAY_FLAGS_INTERLACED;
> +	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
> +		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
> +	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
> +		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
> +}
> +EXPORT_SYMBOL_GPL(videomode_from_drm_display_mode);

Is it ok for drm_modes to export a function that doesn't start with
drm_ ? We could just rename this to drm_display_mode_to_videomode if
necessary. I can fix it up as I apply it, but I'd like to know which is
preferred.

regards
Philipp

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