From: Wolfgang Muees <wolfgang.mues@auerswald.de>
Date: Wed, 11 Mar 2009 13:28:39 +0000 (+0100)
Subject: mmc_spi: allow higher timeouts for SPI mode
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c0c88871574ccb4ee53dde1bbb678931b38ed47b;p=linux-beck.git

mmc_spi: allow higher timeouts for SPI mode

Some SD cards have very high timeouts in SPI mode.
So adjust the timeouts from theory to practice.

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/core/core.c b/drivers/mmc/core/core.c
index 4a18d90556d9..5c83c67b186c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -297,6 +297,21 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 			data->timeout_clks = 0;
 		}
 	}
+	/*
+	 * Some cards need very high timeouts if driven in SPI mode.
+	 * The worst observed timeout was 900ms after writing a
+	 * continuous stream of data until the internal logic
+	 * overflowed.
+	 */
+	if (mmc_host_is_spi(card->host)) {
+		if (data->flags & MMC_DATA_WRITE) {
+			if (data->timeout_ns < 1000000000)
+				data->timeout_ns = 1000000000;	/* 1s */
+		} else {
+			if (data->timeout_ns < 100000000)
+				data->timeout_ns =  100000000;	/* 100ms */
+		}
+	}
 }
 EXPORT_SYMBOL(mmc_set_data_timeout);