linux-kernel - Re: [PATCH] ARM: dt: tegra: ventana: define pinmux for ddc

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Date:	Thu, 25 Oct 2012 09:37:22 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Mark Zhang <markz@...dia.com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dt: tegra: ventana: define pinmux for ddc

On 10/25/2012 12:32 AM, Mark Zhang wrote:
> On 10/23/2012 01:14 AM, Stephen Warren wrote:
...
>> I don't recall why pta was defined to be HDMI. The issue isn't that this
>> patch changes the pinmux selection for the pta pingroup, but simply that
>> both the pinctrl node's state definition, and the new I2C mux node's
>> state definition both attempt to configure pingroup pta. The solution is
>> most likely to simply remove the pta configuration from the main pinctrl
>> node.
> 
> Understood. I tried to remove the hdmi function definition of pta
> pingroup yesterday then found HDMI can't work anymore. The EDID of HDMI
> monitor can't be fetched. After some debugging, I have found that it's
> caused by "i2c-mux-pinctrl" driver is loaded after drm driver. That
> makes drm driver can't get EDID data via this i2c mux adapter because it
> doesn't exist at that time. So I think we need to promote the load level
> of "i2c-mux-pinctrl" driver. Any other ideas?

(BTW, your message that I'm replying to wasn't word-wrapped correctly)

No, i2c-mux-pinctrl shouldn't need to change. It sounds like tegra-drm
isn't supporting deferred probe correctly; when it needs access to an
I2C adapter that doesn't exist, it should defer its own probe until the
I2C adapter does exist.
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