fix compatibility with certain SD cards

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16249 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 46 insertions, 0 deletions

diff --git a/target/linux/kirkwood/patches/002-mvsdio_delay.patch b/target/linux/kirkwood/patches/002-mvsdio_delay.patch
new file mode 100644
index 000000000..ee730306a
--- /dev/null
+++ b/target/linux/kirkwood/patches/002-mvsdio_delay.patch
@@ -0,0 +1,46 @@
+--- a/drivers/mmc/core/sd.c
++++ b/drivers/mmc/core/sd.c
+@@ -263,6 +263,15 @@ static int mmc_switch_hs(struct mmc_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(1000);
++
+ 	err = mmc_sd_switch(card, 1, 0, 1, status);
+ 	if (err)
+ 		goto out;
+--- a/drivers/mmc/host/mvsdio.c
++++ b/drivers/mmc/host/mvsdio.c
+@@ -620,9 +620,11 @@ static void mvsd_set_ios(struct mmc_host
+ 	if (ios->bus_width == MMC_BUS_WIDTH_4)
+ 		ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
+ 
++#if 0
+ 	if (ios->timing == MMC_TIMING_MMC_HS ||
+ 	    ios->timing == MMC_TIMING_SD_HS)
+ 		ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
++#endif
+ 
+ 	host->ctrl = ctrl_reg;
+ 	mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
+--- a/drivers/mmc/core/core.c
++++ b/drivers/mmc/core/core.c
+@@ -286,9 +286,9 @@ void mmc_set_data_timeout(struct mmc_dat
+ 			 * The limit is really 250 ms, but that is
+ 			 * insufficient for some crappy cards.
+ 			 */
+-			limit_us = 300000;
++			limit_us = 500000;
+ 		else
+-			limit_us = 100000;
++			limit_us = 200000;
+ 
+ 		/*
+ 		 * SDHC cards always use these fixed values.