linux-kernel - Re: [PATCH] drm/i2c: tda998x: don't register the connector

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Message-ID: <20160725125406.GB13937@e106950-lin.cambridge.arm.com>
Date:	Mon, 25 Jul 2016 13:54:06 +0100
From:	Brian Starkey <brian.starkey@....com>
To:	Russell King - ARM Linux <linux@...linux.org.uk>
Cc:	dri-devel@...ts.freedesktop.org, airlied@...ux.ie,
	linux-kernel@...r.kernel.org, Liviu.Dudau@....com
Subject: Re: [PATCH] drm/i2c: tda998x: don't register the connector

Hi Russell,

On Mon, Jul 25, 2016 at 01:25:04PM +0100, Russell King - ARM Linux wrote:
>On Mon, Jul 25, 2016 at 11:55:48AM +0100, Brian Starkey wrote:
>> The connector shouldn't be registered until the rest of the whole device
>> is set up, so that consistent state is presented to userspace.
>>
>> As drm_dev_register() now registers all of the connectors anyway,
>> there's no need to explicitly do it in individual drivers so remove
>> the calls to drm_connector_register()/drm_connector_unregister().
>>
>> This allows componentised drivers to use tda998x without having racy
>> initialisation.
>
>Is there a corresponding patch for armada-drm so that the cubox doesn't
>regress?  Has it already been merged?
>

A patch for armada-drm to do what?

I should perhaps have explicitly mentioned that this change depends
on e28cd4d0a223: "drm: Automatically register/unregister all
connectors", which is in drm-next.

Like my commit message says - after the above commit, all connectors
are automatically registered in drm_dev_register() - so I don't
anticipate any regression, but I don't have a cubox to test.

armada-drm seems to be doing effectively the same thing as arm/hdlcd,
which works fine after this patch with no other changes.

Let me know if I've missed something; or if you are able to test on
cubox that would be great.

Thanks,
Brian

>-- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
>FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
>according to speedtest.net.
>