Re: [PATCH 1/8] drm/i2c: tda998x: fix EDID reading on TDA19988 devices

From: Rob Clark
Date: Wed Aug 14 2013 - 08:32:37 EST

On Wed, Aug 14, 2013 at 8:16 AM, Russell King - ARM Linux
<linux@xxxxxxxxxxxxxxxx> wrote:
> On Tue, Aug 06, 2013 at 12:20:11AM +0200, Sebastian Hesselbarth wrote:
>> From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
>> TDA19988 devices need their RAM enabled in order to read EDID
>> information. Add support for this.
>> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
>> Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
> There was some debate about whether this is needed or not. It seems that
> if I don't run the NXP driver, it isn't needed, but if I have run the
> NXP driver, then yes it is. As it seems to do no harm, I think it's fine
> to be submitted.

just fwiw, I had noticed before that (at least on the
beaglebone-black), nxp doesn't necessarily get reset when doing a warm
reboot. So booting a kernel w/ NXP driver, and then rebooting w/
upstream kernel and tda998x should probably hit this same scenario.
Better to not assume too much about the state of the tda when the
driver is loaded, so I think this patch is a good idea.

Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>

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