mmc: fix

add backport of: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7472bab236bdee1173412585591329e718f4d324

fixes: beagleboard/kernel#70

Reported-by: Charles Steinkuehler <[email protected]>
Signed-off-by: Robert Nelson <[email protected]>

patch.sh

@@ -830,6 +830,7 @@ am33x_after () {
 	${git} "${DIR}/patches/fixes/0001-sync-don-t-block-the-flusher-thread-waiting-on-IO.patch"
 	${git} "${DIR}/patches/fixes/0002-USB-Fix-USB-device-disconnects-on-resume.patch"
 	${git} "${DIR}/patches/fixes/0003-beaglebone-switch-uSD-to-4-bit-mode.patch"
+	${git} "${DIR}/patches/fixes/0004-mmc-omap_hsmmc-clear-status-flags-before-starting-a-.patch"
 
 	echo "dir: firmware"
 	#http://arago-project.org/git/projects/?p=am33x-cm3.git;a=summary

patches/fixes/0004-mmc-omap_hsmmc-clear-status-flags-before-starting-a-.patch

@@ -0,0 +1,47 @@
+From 38b650a239a6b47a43eaf12123d6885b0cbc596e Mon Sep 17 00:00:00 2001
+From: Francesco Lavra <[email protected]>
+Date: Sat, 29 Jun 2013 06:25:12 +0000
+Subject: [PATCH 4/4] mmc: omap_hsmmc: clear status flags before starting a new
+ command
+
+Commit 1f6b9fa40e76fffaaa0b3bd6a0bfdcf1cdc06efa consolidated writes to
+the STAT register in one location, moving them from omap_hsmmc_do_irq()
+to omap_hsmmc_irq(). This move has the unwanted side effect that the
+controller status flags are potentially cleared after a new command has
+been started as a consequence of reading the previous status flags.
+This means that if the new command changes the status flags before the
+IRQ routine returns, those flags may be cleared without handling the
+event which asserted them, and thus missing the event.
+Move the writing of the STAT register back in omap_hsmmc_do_irq(),
+before handling the status flags which generated the interrupt.
+
+Signed-off-by: Francesco Lavra <[email protected]>
+Reviewed-and-Tested-by: Balaji T K <[email protected]>
+Signed-off-by: Chris Ball <[email protected]>
+---
+ drivers/mmc/host/omap_hsmmc.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
+index e2b97df..04daf72 100644
+--- a/drivers/mmc/host/omap_hsmmc.c
++++ b/drivers/mmc/host/omap_hsmmc.c
+@@ -1070,6 +1070,7 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
+ 		}
+ 	}
+
++	OMAP_HSMMC_WRITE(host->base, STAT, status);
+ 	if (end_cmd || ((status & CC_EN) && host->cmd))
+ 		omap_hsmmc_cmd_done(host, host->cmd);
+ 	if ((end_trans || (status & TC_EN)) && host->mrq)
+@@ -1089,7 +1090,6 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
+ 		omap_hsmmc_do_irq(host, status);
+
+ 		/* Flush posted write */
+-		OMAP_HSMMC_WRITE(host->base, STAT, status);
+ 		status = OMAP_HSMMC_READ(host->base, STAT);
+ 	}
+
+-- 
+1.8.4.2
+

version.sh

@@ -27,7 +27,7 @@ linaro_toolchain="cortex_gcc_4_7"
 #Kernel/Build
 KERNEL_REL=3.8
 KERNEL_TAG=${KERNEL_REL}.13
-BUILD=bone28
+BUILD=bone28.1
 
 #v3.X-rcX + upto SHA
 #KERNEL_SHA=""