mmc: sdhci: Deal with failure case in sdhci_suspend_host

If there are errors happened in sdhci_suspend_host, handle it so that
when the function returns with an error, the host's behaviour is the
same before this function call, e.g. card detection is enabled and
tuning timer is active, etc.
Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci.c

@@ -2349,19 +2349,30 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 int sdhci_suspend_host(struct sdhci_host *host)
 {
 	int ret;
+	bool has_tuning_timer;
 
 	sdhci_disable_card_detection(host);
 
 	/* Disable tuning since we are suspending */
-	if (host->version >= SDHCI_SPEC_300 && host->tuning_count &&
-	    host->tuning_mode == SDHCI_TUNING_MODE_1) {
+	has_tuning_timer = host->version >= SDHCI_SPEC_300 &&
+		host->tuning_count && host->tuning_mode == SDHCI_TUNING_MODE_1;
+	if (has_tuning_timer) {
 		del_timer_sync(&host->tuning_timer);
 		host->flags &= ~SDHCI_NEEDS_RETUNING;
 	}
 
 	ret = mmc_suspend_host(host->mmc);
-	if (ret)
+	if (ret) {
+		if (has_tuning_timer) {
+			host->flags |= SDHCI_NEEDS_RETUNING;
+			mod_timer(&host->tuning_timer, jiffies +
+					host->tuning_count * HZ);
+		}
+
+		sdhci_enable_card_detection(host);
+
 		return ret;
+	}
 
 	free_irq(host->irq, host);