To avoid glitches in the card clock output,
need to check whether card is busy or not.
Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
drivers/mmc/host/dw_mmc.c | 30 ++++++++++++++++++++++++------
drivers/mmc/host/dw_mmc.h | 1 +
2 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 36f98c0..8bef3c2 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -623,6 +623,27 @@ static void mci_send_cmd(struct dw_mci_slot *slot, u32
cmd, u32 arg)
cmd, arg, cmd_status);
}
+static void dw_mci_inform_ciu(struct dw_mci_slot *slot)
+{
+ struct dw_mci *host = slot->host;
+ unsigned long timeout = jiffies + msecs_to_jiffies(500);
+ u32 ctrl, status;
+
+ do {
+ status = mci_readl(host, STATUS);
+ if (!(status & SDMMC_DATA_BUSY))
+ break;
+ ctrl = mci_readl(host, CTRL);
+ ctrl |= SDMMC_CTRL_RESET;
+ mci_writel(host, CTRL, ctrl);
+ } while (time_before(jiffies, timeout));
+
+ if (status & SDMMC_DATA_BUSY)
+ dev_err(&slot->mmc->class_dev,"Card is busy..!\n");
+
+ mci_send_cmd(slot, SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+}
+
static void dw_mci_setup_bus(struct dw_mci_slot *slot)
{
struct dw_mci *host = slot->host;
@@ -650,15 +671,13 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot)
mci_writel(host, CLKSRC, 0);
/* inform CIU */
- mci_send_cmd(slot,
- SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+ dw_mci_inform_ciu(slot);
/* set clock to desired speed */
mci_writel(host, CLKDIV, div);
/* inform CIU */
- mci_send_cmd(slot,
- SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+ dw_mci_inform_ciu(slot);
/* enable clock; only low power if no SDIO */
clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
@@ -667,8 +686,7 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot)
mci_writel(host, CLKENA, clk_en_a);
/* inform CIU */
- mci_send_cmd(slot,
- SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+ dw_mci_inform_ciu(slot);
host->current_speed = slot->clock;
}
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 15c27e1..b6a1a78 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -127,6 +127,7 @@
#define SDMMC_CMD_INDX(n) ((n) & 0x1F)
/* Status register defines */
#define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF)
+#define SDMMC_DATA_BUSY BIT(9)
/* Internal DMAC interrupt defines */
#define SDMMC_IDMAC_INT_AI BIT(9)
#define SDMMC_IDMAC_INT_NI BIT(8)
--
1.7.4.1
--
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