linux-kernel - Re: [PATCH v2 4/8] drm/i2c: tda998x: prepare for video input configuration

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Date:	Thu, 22 Aug 2013 08:53:13 +0200
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	Darren Etheridge <darren.etheridge@...il.com>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/8] drm/i2c: tda998x: prepare for video input
 configuration

On Wed, 21 Aug 2013 23:36:05 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> > AFAIK, the TI boards have no "pin-swapped", nor has the Cubox (there is
> > no need to set the bit CFG_GRA_SWAPRB of the register LCD_SPU_DMA_CTRL0
> > of the Dove lcd for RGB or YUV formats).
> > 
> > Which board needs a special VIP configuration?  
> 
> If you run the NXP driver, and then run this driver, things get messed
> up - which has already been covered months ago when this patch was first
> brought up.
> 
> It's there to ensure that the TDA998x is correctly configured no matter
> what it's previous state is, and prevent the thing being fragile as hell.

The NXP driver will never go to the mainline, so, I don't see the
problem. If you want to use it to test some other drivers, you should
better patch it instead of adding useless code in the TDA998x driver.

> No, reset doesn't restore its settings, only a power cycle does.

Sorry, all VIP control registers may be changed at any time and the
change appears immediately (thank you for the /sys i2c_read/write).

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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