Currently when no expected completion condition occures in the
mmc_send_cmd while loop that is waiting for a data transfer to
complete the MMC driver just hangs.
This patch adds an arbitrary 2 second timeout. If nothing we
recognize occures within 2 seconds some diagnostic information
is printed and we fail out.
Signed-off-by: Anton Staaf <robot...@chromium.org>
Cc: Tom Warren <twar...@nvidia.com>
Cc: Stephen Warren <swar...@nvidia.com>
---
drivers/mmc/tegra2_mmc.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/tegra2_mmc.c b/drivers/mmc/tegra2_mmc.c
index 195f89d..27564b0 100644
--- a/drivers/mmc/tegra2_mmc.c
+++ b/drivers/mmc/tegra2_mmc.c
@@ -246,6 +246,8 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd
*cmd,
}
if (data) {
+ unsigned long start = get_timer(0);
+
while (1) {
mask = readl(&host->reg->norintsts);
@@ -269,6 +271,18 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd
*cmd,
/* Transfer Complete */
debug("r/w is done\n");
break;
+ } else if (get_timer(start) > 2000UL) {
+ writel(mask, &host->reg->norintsts);
+ printf("%s: MMC Timeout\n"
+ " Interrupt status 0x%08x\n"
+ " Interrupt status enable 0x%08x\n"
+ " Interrupt signal enable 0x%08x\n"
+ " Present status 0x%08x\n",
+ __func__, mask,
+ readl(&host->reg->norintstsen),
+ readl(&host->reg->norintsigen),
+ readl(&host->reg->prnsts));
+ return -1;
}
}
writel(mask, &host->reg->norintsts);
--
1.7.3.1
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