From: Bing Zhao <bzhao@marvell.com>
Date: Wed, 20 May 2009 02:48:19 +0000 (-0700)
Subject: libertas: get SD8688 rx length with one CMD52
X-Git-Tag: v2.6.31-rc1~330^2~313^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b136a1414c94b4bda1057b4ffde26253d2527628;p=pandora-kernel.git

libertas: get SD8688 rx length with one CMD52

Usually, the 16-bit rx length is read from scratch pad registers
with two CMD52 transactions:
SD8385: 	IF_SDIO_SCRATCH_OLD (0x80fe/0x80ff)
SD8686/SD8688:	IF_SDIO_SCRATCH     (0x34/0x35)

Alternatively, SD8688 firmware offers an enhanced method for driver
to read an 8-bit rx length (in units) with a single CMD52:
IF_SDIO_RX_UNIT 0x43 is read one time after firmware is ready.
IF_SDIO_RX_LEN  0x42 is read every time when rx interrupt is received.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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