linux-kernel - Re: [PATCH] drm/cirrus: Add bpp option

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Message-ID: <20130129095350.GI14766@phenom.ffwll.local>
Date:	Tue, 29 Jan 2013 10:53:50 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	Bernhard Wiedemann <bwiedemann@...e.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/cirrus: Add bpp option

On Tue, Jan 29, 2013 at 09:29:17AM +0100, Takashi Iwai wrote:
> Add a new option, bpp, to specify the default bpp value.
> 
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> ---
> 
> This patch is applied on the top of previous two patches.
> I couldn't find an easy way to specify the default bpp, so I cooked
> the driver quickly.  If there is any other convenient way to achieve
> this, let me know...

Well, you can specify the desired bpp with a full mode on the kernel
cmdline - the '-bpp' extension. Reading through the parser I think it
should work even with just the '-bpp' and not a full mode, but I haven't
tested. Look for cmdline_mode->bpp_specified in drm_fb_helper.c and the
relevant parsing code in drm_mode_parse_command_line_for_connector in
drm_modes.c

If that doesn't work for you, I think it's better to extend/fix it than
add driver module options.

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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