linux-kernel - Re: [PATCH] ARM64: dts: Mediatek: mt8173-evb: fix access MMC fail issue

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Date:	Mon, 22 Feb 2016 16:32:54 -0800
From:	Kevin Hilman <khilman@...libre.com>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Henry Chen <henryc.chen@...iatek.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH] ARM64: dts: Mediatek: mt8173-evb: fix access MMC fail issue

Eddie Huang <eddie.huang@...iatek.com> writes:

> MT8173 E1 chip has one bug that if turn off USB power domain, vcore
> power will also be off, thus cause modules using vcore power domain
> fail, like MMC. The E1 chip only found on MT8173-evb board and this
> board only has E1 chip, so implement this as a board specific
> workaround.
>
> Pwrapper use vcore power, so add pwrapper using USB power domain to
> keep USB power domain not to zero and disabled.
>
> Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>

Tested-by: Kevin Hilman <khilman@...libre.com>

I verified that this gets my mt8173-evb booting again when I enable MMC
support.

Thanks,

Kevin