apply workaround for imx eSDHC controller to avoid
missing card interrupt so that SDIO function is workable
Signed-off-by: Tony Lin <tony....@freescale.com>
---
drivers/mmc/host/sdhci-esdhc-imx.c | 39 +++++++++++++++++++++++++++--------
1 files changed, 30 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c
b/drivers/mmc/host/sdhci-esdhc-imx.c
index a19967d..da77cae 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -32,6 +32,8 @@
#define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002
#define ESDHC_FLAG_GPIO_FOR_CD_WP (1 << 0)
+
+#define SDHCI_CTRL_D3CD 0x08
/*
* The CMDTYPE of the CMD register (offset 0xE) should be set to
* "11" when the STOP CMD12 is issued on imx53 to abort one
@@ -87,14 +89,31 @@ static void esdhc_writel_le(struct sdhci_host *host, u32
val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
-
- if (unlikely((reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)
- && (imx_data->flags & ESDHC_FLAG_GPIO_FOR_CD_WP)))
- /*
- * these interrupts won't work with a custom card_detect gpio
- * (only applied to mx25/35)
- */
- val &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
+ u32 data;
+
+ if (unlikely((reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE))) {
+ if (imx_data->flags & ESDHC_FLAG_GPIO_FOR_CD_WP)
+ /*
+ * these interrupts won't work with a custom
+ * card_detect gpio (only applied to mx25/35)
+ */
+ val &= ~(SDHCI_INT_CARD_REMOVE | \
+ SDHCI_INT_CARD_INSERT);
+
+ if (val & SDHCI_INT_CARD_INT) {
+ /*
+ * clear D3CD bit and set D3CD bit to avoid
+ * missing card interrupt
+ * this is a eSDHC controller problem so that
+ * we need to apply following workaround
+ */
+ data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
+ data &= ~SDHCI_CTRL_D3CD;
+ writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
+ data |= SDHCI_CTRL_D3CD;
+ writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
+ }
+ }
if (unlikely((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (reg == SDHCI_INT_STATUS)
@@ -165,7 +184,9 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8
val, int reg)
return;
case SDHCI_HOST_CONTROL:
/* FSL messed up here, so we can just keep those two */
- new_val = val & (SDHCI_CTRL_LED | SDHCI_CTRL_4BITBUS);
+ new_val = val & (SDHCI_CTRL_LED | \
+ SDHCI_CTRL_4BITBUS | \
+ SDHCI_CTRL_D3CD);
/* ensure the endianess */
new_val |= ESDHC_HOST_CONTROL_LE;
/* DMA mode bits are shifted */
--
1.7.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
