openwrt-xburst/target/linux/goldfish/patches-2.6.30/0100-mmc-sd-Add-retries-in-re-detection.patch

From 39e3d37b1f7194277b8a3ea3536a67ec2d24491e Mon Sep 17 00:00:00 2001
From: San Mehat <san@android.com>
Date: Thu, 4 Dec 2008 11:18:00 -0800
Subject: [PATCH 100/134] mmc: sd: Add retries in re-detection

Signed-off-by: San Mehat <san@android.com>
---
 drivers/mmc/core/sd.c |   46 +++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 43 insertions(+), 3 deletions(-)

--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -558,18 +558,37 @@ static void mmc_sd_remove(struct mmc_hos
  */
 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);
+		printk("%s(%s): err = %d\n", __func__, mmc_hostname(host), err);
+		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) {
@@ -664,6 +683,9 @@ static const struct mmc_bus_ops mmc_sd_o
 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);
@@ -712,9 +734,27 @@ int mmc_attach_sd(struct mmc_host *host,
 	/*
 	 * 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);