From: Wolfgang Muees <wolfgang.mues@auerswald.de>
Date: Wed, 11 Mar 2009 13:17:43 +0000 (+0100)
Subject: mmc_spi: wait more bytes for card response
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ea15ba5cd7bb370902cd9f6a73c2d288bfba6b2c;p=linux-2.6-omap-h63xx.git

mmc_spi: wait more bytes for card response

Some cards are slower than the standard allows and need more
time to respond to a command. Max. observed number of bytes
was 12.

Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
---

diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index ad9e0e213f6..69e1442ff2e 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -279,8 +279,11 @@ static int mmc_spi_response_get(struct mmc_spi_host *host,
 		 * so it can always DMA directly into the target buffer.
 		 * It'd probably be better to memcpy() the first chunk and
 		 * avoid extra i/o calls...
+		 *
+		 * Note we check for more than 8 bytes, because in practice,
+		 * some SD cards are slow...
 		 */
-		for (i = 2; i < 9; i++) {
+		for (i = 2; i < 16; i++) {
 			value = mmc_spi_readbytes(host, 1);
 			if (value < 0)
 				goto done;