diff options
| author | RichardZhu <richard.zhu@linaro.org> | 2011-11-16 11:28:50 +0800 |
|---|---|---|
| committer | Eric Miao <eric.miao@linaro.org> | 2012-01-09 20:42:49 +0800 |
| commit | c68b33e4d23fbe733becfe6b2264f837e9459613 (patch) | |
| tree | 400bac09227c6cf45716eebcf276347ed63fac0c /drivers/mmc/host/sdhci-esdhc-imx.c | |
| parent | 6155aface4a5048b6398fe2b5bc33687db9fb26b (diff) | |
mmc: sdhci-esdhc-imx: workaround for TC intr coming ealier than DMA intri
On mx6, if TC interrupt bit is set but DMA interrupt bit is clear,
read status register again in case DMA interrupt will come in next
time cycle.
Signed-off-by: Tony Lin <tony.lin@freescale.com>
Signed-off-by: RichardZhu <richard.zhu@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci-esdhc-imx.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 38ebc4ea259..5888f041ae2 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -170,6 +170,19 @@ static u32 esdhc_readl_le(struct sdhci_host *host, int reg) } if (unlikely(reg == SDHCI_INT_STATUS)) { + if (is_imx6q_usdhc(imx_data)) { + /* + * on mx6q, there is low possibility that + * DATA END interrupt comes ealier than DMA + * END interrupt which is conflict with standard + * host controller spec. In this case, read the + * status register again will workaround this issue. + */ + if ((val & SDHCI_INT_DATA_END) && \ + !(val & SDHCI_INT_DMA_END)) + val = readl(host->ioaddr + reg); + } + if (val & SDHCI_INT_VENDOR_SPEC_DMA_ERR) { val &= ~SDHCI_INT_VENDOR_SPEC_DMA_ERR; val |= SDHCI_INT_ADMA_ERROR; |