linux-kernel - RE: [PATCH] mmc: disable UHS on broadcom sdhci

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Message-ID: <156984479488CD49A184F5CAB4AF9346070A12A6@IRVEXCHMB14.corp.ad.broadcom.com>
Date:	Mon, 18 Nov 2013 22:13:05 +0000
From:	"Stephen Hurd" <shurd@...adcom.com>
To:	"Olof Johansson" <olof@...om.net>,
	"Grant Grundler" <grundler@...omium.org>
cc:	"Chris Ball" <cjb@...top.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"Olof Johansson" <olofj@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mmc: disable UHS on broadcom sdhci

> SDHCI_QUIRK2_BCM57785_CR:
>     Bit twiddles some Broadcom-specific registers and supresses an error
>     about the 64k bar0.

> I think this can be done without spending a global SDHCI quirk bit. This
> is just a one-time setup that needs to be done, isn't it? It's hard
> to tell since there's no official errata described, but if it is, then
> overriding the probe function is the way to go instead, flipping these
> bits there and then call the regular probe.

Yeah, I have confirmed that these bits need  to be twiddled during every clock setting (ie: for each card enumeration) not one time when the chip is enabled.

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