mmc: core: add a short delay in mmc_power_off

[pandora-kernel.git] / drivers / mmc / core / core.c

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index b27b940..7289e99 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -24,6 +24,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
+#include <linux/fault-inject.h>
+#include <linux/random.h>
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -83,6 +85,43 @@ static void mmc_flush_scheduled_work(void)
        flush_workqueue(workqueue);
 }
 
+#ifdef CONFIG_FAIL_MMC_REQUEST
+
+/*
+ * Internal function. Inject random data errors.
+ * If mmc_data is NULL no errors are injected.
+ */
+static void mmc_should_fail_request(struct mmc_host *host,
+                                   struct mmc_request *mrq)
+{
+       struct mmc_command *cmd = mrq->cmd;
+       struct mmc_data *data = mrq->data;
+       static const int data_errors[] = {
+               -ETIMEDOUT,
+               -EILSEQ,
+               -EIO,
+       };
+
+       if (!data)
+               return;
+
+       if (cmd->error || data->error ||
+           !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
+               return;
+
+       data->error = data_errors[random32() % ARRAY_SIZE(data_errors)];
+       data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9;
+}
+
+#else /* CONFIG_FAIL_MMC_REQUEST */
+
+static inline void mmc_should_fail_request(struct mmc_host *host,
+                                          struct mmc_request *mrq)
+{
+}
+
+#endif /* CONFIG_FAIL_MMC_REQUEST */
+
 /**
  *     mmc_request_done - finish processing an MMC request
  *     @host: MMC host which completed request
@@ -109,6 +148,8 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
                cmd->error = 0;
                host->ops->request(host, mrq);
        } else {
+               mmc_should_fail_request(host, mrq);
+
                led_trigger_event(host->led, LED_OFF);
 
                pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
@@ -330,7 +371,7 @@ EXPORT_SYMBOL(mmc_wait_for_req);
  */
 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
 {
-       struct mmc_request mrq = {0};
+       struct mmc_request mrq = {NULL};
 
        WARN_ON(!host->claimed);
 
@@ -1173,6 +1214,13 @@ static void mmc_power_off(struct mmc_host *host)
        host->ios.timing = MMC_TIMING_LEGACY;
        mmc_set_ios(host);
 
+       /*
+        * Some configurations, such as the 802.11 SDIO card in the OLPC
+        * XO-1.5, require a short delay after poweroff before the card
+        * can be successfully turned on again.
+        */
+       mmc_delay(1);
+
        mmc_host_clk_release(host);
 }