linux-kernel - Re: [PATCH v2 9/28] drm/i2c: tda998x: don't read write-only registers

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Message-ID: <20140111172323.GV15937@n2100.arm.linux.org.uk>
Date:	Sat, 11 Jan 2014 17:23:23 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	dri-devel@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
	Dave Airlie <airlied@...il.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 9/28] drm/i2c: tda998x: don't read write-only
	registers

On Thu, Jan 09, 2014 at 11:59:41AM +0100, Jean-Francois Moine wrote:
> This patch takes care of the write-only registers of the tda998x.
> 
> Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>

It would be worth commenting that where bit settings are unknown, they
are taken from the default values in the available public data.  I
refer to (for example) the addition of MAT_CONTRL_MAT_SC(1) to the
REG_MAT_CONTRL register in this patch.

The other register ordering changes should also be documented.

However, in my brief test, I haven't noticed any visible detrimental
effects.

Tested-by: Russell King <rmk+kernel@....linux.org.uk>
Acked-by: Russell King <rmk+kernel@....linux.org.uk>

Thanks.

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