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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);
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