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

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Date:	Tue, 29 Jan 2013 11:03:49 +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 10:57 AM, Takashi Iwai <tiwai@...e.de> wrote:
> At Tue, 29 Jan 2013 10:53:50 +0100,
> Daniel Vetter wrote:
>>
>> 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.
>
> Well, the fb can be set by that option, but the default modeset
> doesn't seem to honor it.  So if you start X modeset driver, it still
> takes what the driver sets as default.  That was the problem I hit.

Oh, I've missed the preferred_bpp hint for the generic modesetting
driver. Can we fill that in by using the bpp parsed in the fb helper
somehow?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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