Hello Tony,
On Mon, Jul 18, 2011 at 01:20:02PM +0800, Tony Lin wrote:
> apply workaround for imx eSDHC controller to avoid
> missing card interrupt so that SDIO function is workable
Fixing a few typos (but note, I'm not a native speaker):
mmc/sdhci-esdhc-imx: fix losing card interrupt
Apply workaround for the imx eSDHC controller to avoid missing a
card interrupt.
Signed-off-by: ...
> 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)
hmm, ok, this was here before, but I wonder about the "only applied to
mx25/35" part. How is that meant? I don't see logic to prevent other
socs using this workaround.
> + */
> + 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
s/following/this/ ? If not, according to my (non-native) English you
need to add a "the" before "following".
> + */
> + 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);
Is there some Documentation about this problem? If yes, maybe add a link
to it? Alternatively describe the problem more exact in a comment
please.
> + }
> + }
>
> 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);
This makes the comment wrong---now there are three bits that can be
preserved.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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