mmc: dw_mmc: enable controller interrupt before calling mmc_start_host

As mmc_start_host is getting called before enabling the dw_mmc controller
interrupt, there is a problem of missing the SDMMC_INT_CMD_DONE for the
very first command sent by the sdio_reset.

This problem occurs only when we disable MMC debugging i.e, MMC_DEBUG=n.
This patch enables the dw_mmc controller interrupt before mmc_start_host.

Signed-off-by: Yuvaraj CD <yuvaraj.cd@samsung.com>
Reviewed-by: Girish K S <girish.shivananjappa@linaro.org>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 250aa18..4b2bedc 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2228,6 +2228,21 @@ int dw_mci_probe(struct dw_mci *host)
        else
                host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
 
+       /*
+        * Enable interrupts for command done, data over, data empty, card det,
+        * receive ready and error such as transmit, receive timeout, crc error
+        */
+       mci_writel(host, RINTSTS, 0xFFFFFFFF);
+       mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
+                  SDMMC_INT_TXDR | SDMMC_INT_RXDR |
+                  DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
+       mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
+
+       dev_info(host->dev, "DW MMC controller at irq %d, "
+                "%d bit host data width, "
+                "%u deep fifo\n",
+                host->irq, width, fifo_size);
+
        /* We need at least one slot to succeed */
        for (i = 0; i < host->num_slots; i++) {
                ret = dw_mci_init_slot(host, i);
@@ -2257,20 +2272,6 @@ int dw_mci_probe(struct dw_mci *host)
        else
                host->data_offset = DATA_240A_OFFSET;
 
-       /*
-        * Enable interrupts for command done, data over, data empty, card det,
-        * receive ready and error such as transmit, receive timeout, crc error
-        */
-       mci_writel(host, RINTSTS, 0xFFFFFFFF);
-       mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
-                  SDMMC_INT_TXDR | SDMMC_INT_RXDR |
-                  DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
-       mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
-
-       dev_info(host->dev, "DW MMC controller at irq %d, "
-                "%d bit host data width, "
-                "%u deep fifo\n",
-                host->irq, width, fifo_size);
        if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
                dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");