linux-kernel - [PATCH] tmio_mmc: Allow 2 byte requests in 4-bit mode

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Message-id: <4C4555DA.40203@renesas.com>
Date:	Tue, 20 Jul 2010 16:52:58 +0900
From:	Yusuke Goda <yusuke.goda.sx@...esas.com>
To:	ian@...menth.co.uk, damm@...nsource.se, sameo@...ux.intel.com,
	Paul Mundt <lethal@...ux-sh.org>, g.liakhovetski@....de,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] tmio_mmc: Allow 2 byte requests in 4-bit mode

Adjust the tmio_mmc block size check to accept 2-byte requests in 4-bit mode.
Tested with the SDHI hardware block included in sh7724.

Signed-off-by: Yusuke Goda <yusuke.goda.sx@...esas.com>
---
 drivers/mmc/host/tmio_mmc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index ee7d0a5..f49d945 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -660,8 +660,8 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,
 	pr_debug("setup data transfer: blocksize %08x  nr_blocks %d\n",
 		 data->blksz, data->blocks);

-	/* Hardware cannot perform 1 and 2 byte requests in 4 bit mode */
-	if (data->blksz < 4 && host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
+	/* Hardware cannot perform 1 byte requests in 4 bit mode */
+	if (data->blksz < 2 && host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
 		pr_err("%s: %d byte block unsupported in 4 bit mode\n",
 		       mmc_hostname(host->mmc), data->blksz);
 		return -EINVAL;
-- 
1.7.0



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