From: San Mehat <san@android.com>
Date: Thu, 4 Dec 2008 19:18:00 +0000 (-0800)
Subject: mmc: sd: Add retries in re-detection
X-Git-Tag: firefly_0821_release~11722
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5b23a96fd66d13f00315d5d46f2b399464707a90;p=firefly-linux-kernel-4.4.55.git

mmc: sd: Add retries in re-detection

Signed-off-by: San Mehat <san@android.com>

mmc: sd: Remove debugging printk

Signed-off-by: Dima Zavin <dima@android.com>
---

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 53f15b7f1ece..8fe5e9ece251 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -558,18 +558,36 @@ static void mmc_sd_remove(struct mmc_host *host)
  */
 static void mmc_sd_detect(struct mmc_host *host)
 {
-	int err;
+	int err = 0;
+#ifdef CONFIG_MMC_PARANOID_SD_INIT
+        int retries = 5;
+#endif
 
 	BUG_ON(!host);
 	BUG_ON(!host->card);
-
+       
 	mmc_claim_host(host);
 
 	/*
 	 * Just check if our card has been removed.
 	 */
+#ifdef CONFIG_MMC_PARANOID_SD_INIT
+	while(retries) {
+		err = mmc_send_status(host->card, NULL);
+		if (err) {
+			retries--;
+			udelay(5);
+			continue;
+		}
+		break;
+	}
+	if (!retries) {
+		printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n",
+		       __func__, mmc_hostname(host), err);
+	}
+#else
 	err = mmc_send_status(host->card, NULL);
-
+#endif
 	mmc_release_host(host);
 
 	if (err) {
@@ -697,6 +715,9 @@ static void mmc_sd_attach_bus_ops(struct mmc_host *host)
 int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 {
 	int err;
+#ifdef CONFIG_MMC_PARANOID_SD_INIT
+	int retries;
+#endif
 
 	BUG_ON(!host);
 	WARN_ON(!host->claimed);
@@ -745,9 +766,27 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	/*
 	 * Detect and init the card.
 	 */
+#ifdef CONFIG_MMC_PARANOID_SD_INIT
+	retries = 5;
+	while (retries) {
+		err = mmc_sd_init_card(host, host->ocr, NULL);
+		if (err) {
+			retries--;
+			continue;
+		}
+		break;
+	}
+
+	if (!retries) {
+		printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n",
+		       mmc_hostname(host), err);
+		goto err;
+	}
+#else
 	err = mmc_sd_init_card(host, host->ocr, NULL);
 	if (err)
 		goto err;
+#endif
 
 	mmc_release_host(host);