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From: Nicolas Pitre <nico@cam.org>
Date: Tue, 28 Apr 2009 02:38:12 +0000 (-0400)
Subject: [MMC] give Sandisk/Kingston SDHC cards some slack before the SWITCH command
X-Git-Url: http://git.marvell.com/?p=orion.git;a=commitdiff_plain;h=3ea638523747f6d312f11f643a3175c1a4661eec;hp=c0c3df02efed0e5dea9aa4d8313e06e1f68f2cb4
[MMC] give Sandisk/Kingston SDHC cards some slack before the SWITCH command
Without this delay, those cards simply won't work in high speed mode
as the SWITCH command does not succeeds.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Tested-by: Martin Michlmayr <tbm@cyrius.com>
---
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index cd81c39..ba4c7ab 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -263,6 +263,15 @@ static int mmc_switch_hs(struct mmc_card *card)
return -ENOMEM;
}
+ /*
+ * Some SDHC cards, notably those with a Sandisk SD controller
+ * (also found in Kingston products) need a bit of slack
+ * before successfully handling the SWITCH command. So far,
+ * cards identifying themselves as "SD04G" and "SD08G" are
+ * affected
+ */
+ udelay(100);
+
err = mmc_sd_switch(card, 1, 0, 1, status);
if (err)
goto out;
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