linux-kernel - Re: [PATCH 3/3] mmc: sdhci-pci: allow 8-bit bus width for Intel PCH

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Message-ID: <2073158.vCQHRDAdga@ws-stein>
Date:	Wed, 14 Mar 2012 08:26:07 +0100
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
Cc:	Chris Ball <cjb@...top.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 3/3] mmc: sdhci-pci: allow 8-bit bus width for Intel PCH

Hello Tomoya,

Am Mittwoch, 14. März 2012, 10:17:35 schrieb Tomoya MORINAGA:
> Hi Alexander
> 
> As a matter of interest,
> do you mean that current MMC of eg20t on Linux doesn't support 8-bit access?

We have a board with an 8-bit connected eMMC and Linux only used 4-bit wide 
bus access. After some research IMO the device is only matched to the default 
PCI id class
> PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)

AFAICS it's the same issue with the Medfield eMMC where 8-bit bus support is 
added in 0d013bcf5c272faea1f8e7a5ef3cb2e98103d5cb
This also states the default is 4-bit bus width which I saw before.

Regards,
Alexander
-- 
Dipl.-Inf. Alexander Stein

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