diff options
Diffstat (limited to 'with-linux-3.4/mvsdio-2.patch')
| -rw-r--r-- | with-linux-3.4/mvsdio-2.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/with-linux-3.4/mvsdio-2.patch b/with-linux-3.4/mvsdio-2.patch new file mode 100644 index 0000000..8d53f2a --- /dev/null +++ b/with-linux-3.4/mvsdio-2.patch @@ -0,0 +1,35 @@ +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; + |