Linux 2.6.31 Release for Digi ConnectCore Wi-i.MX boards2.6.31-digi-201102101717

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 34ce2703d29a..355c6042cf65 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -57,6 +57,42 @@ int mmc_deselect_cards(struct mmc_host *host)
 	return _mmc_select_card(host, NULL);
 }
 
+int mmc_card_sleepawake(struct mmc_host *host, int sleep)
+{
+	struct mmc_command cmd;
+	struct mmc_card *card = host->card;
+	int err;
+
+	if (sleep)
+		mmc_deselect_cards(host);
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_SLEEP_AWAKE;
+	cmd.arg = card->rca << 16;
+	if (sleep)
+		cmd.arg |= 1 << 15;
+
+	cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err)
+		return err;
+
+	/*
+	 * If the host does not wait while the card signals busy, then we will
+	 * will have to wait the sleep/awake timeout.  Note, we cannot use the
+	 * SEND_STATUS command to poll the status because that command (and most
+	 * others) is invalid while the card sleeps.
+	 */
+	if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
+		mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
+
+	if (!sleep)
+		err = mmc_select_card(card);
+
+	return err;
+}
+
 int mmc_go_idle(struct mmc_host *host)
 {
 	int err;