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authorYuvaraj CD <yuvaraj.cd@gmail.com>2012-10-08 14:29:51 +0530
committerChris Ball <cjb@laptop.org>2012-11-07 14:55:30 -0500
commit2da1d7f2948900cd50d38643db39f790edb3cc96 (patch)
tree361b697b0f83fa74cf16741359a8d234cfb50116 /drivers
parent63ef5d8c28b2a944f104d854254941e7375c85a3 (diff)
downloadlinux-2da1d7f2948900cd50d38643db39f790edb3cc96.tar.bz2
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/host/dw_mmc.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 250aa1836591..4b2bedc887ba 100644
--- 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");