mmc: Add new API call 'sdio_reset_comm' for resetting communication with an SDIO...

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

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 7d4f471..ab046bb 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -436,3 +436,61 @@ err:
        return err;
 }
 
+int sdio_reset_comm(struct mmc_card *card)
+{
+       struct mmc_host *host = card->host;
+       u32 ocr;
+       int err;
+
+       printk("%s():\n", __func__);
+       mmc_go_idle(host);
+
+       mmc_set_clock(host, host->f_min);
+
+       err = mmc_send_io_op_cond(host, 0, &ocr);
+       if (err)
+               goto err;
+
+       host->ocr = mmc_select_voltage(host, ocr);
+       if (!host->ocr) {
+               err = -EINVAL;
+               goto err;
+       }
+
+       err = mmc_send_io_op_cond(host, host->ocr, &ocr);
+       if (err)
+               goto err;
+
+       if (mmc_host_is_spi(host)) {
+               err = mmc_spi_set_crc(host, use_spi_crc);
+               if (err)
+               goto err;
+       }
+
+       if (!mmc_host_is_spi(host)) {
+               err = mmc_send_relative_addr(host, &card->rca);
+               if (err)
+                       goto err;
+               mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+       }
+       if (!mmc_host_is_spi(host)) {
+               err = mmc_select_card(card);
+               if (err)
+                       goto err;
+       }
+
+       mmc_set_clock(host, card->cis.max_dtr);
+       err = sdio_enable_wide(card);
+       if (err)
+               goto err;
+
+       return 0;
+ err:
+       printk("%s: Error resetting SDIO communications (%d)\n",
+              mmc_hostname(host), err);
+       mmc_release_host(host);
+       return err;
+}
+EXPORT_SYMBOL(sdio_reset_comm);
+
+