From 2bd6a935555b06622fa7f47a9c411b8a7812e4dc Mon Sep 17 00:00:00 2001
From: Arnd Hannemann <arnd@arndnet.de>
Date: Wed, 29 Dec 2010 14:21:14 +0100
Subject: [PATCH] mmc: tmio_mmc: fix CMD irq handling
With current code card insert/eject interrupts will acknowledge outstanding
commands. Normally this seems to be no problem, however if the hardware gets
stuck and no interrupts for CMD_TIMEOUT or CMD_RESPEND are generated, then
inserting and ejecting cards will falsely acknowledge outstanding commands
from the core.
This patch changes the behavior so that CMDs are only acked, if
CMD_TIMEOUT or CMD_RESPEND is received.
Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
---
drivers/mmc/host/tmio_mmc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 689a3692242ed..e3c6ef2083919 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -727,8 +727,10 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid)
*/
/* Command completion */
- if (ireg & TMIO_MASK_CMD) {
- ack_mmc_irqs(host, TMIO_MASK_CMD);
+ if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
+ ack_mmc_irqs(host,
+ TMIO_STAT_CMDRESPEND |
+ TMIO_STAT_CMDTIMEOUT);
tmio_mmc_cmd_irq(host, status);
}
--
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