sdhci : handle busy timeout irq

When we wait for busy after sending a command, if there is
a timeout, we got SDHCI_INT_DATA_TIMEOUT flags.
Before this commit we got the message :
"Got data interrupt 0x00100000 even though no data  operation was in progress."
and we need to wait 10s that sdhci_timeout_timer expires.

Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.c

@@ -2304,6 +2304,11 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 		 * above in sdhci_cmd_irq().
 		 */
 		if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
+			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
+				host->cmd->error = -ETIMEDOUT;
+				tasklet_schedule(&host->finish_tasklet);
+				return;
+			}
 			if (intmask & SDHCI_INT_DATA_END) {
 				sdhci_finish_command(host);
 				return;