2012/1/2 Thierry Reding <thierry.red...@avionic-design.de>:
> This card-detect hook probably doesn't work. Perhaps somebody with more
> knowledge about the hardware can comment on this. I think that perhaps
> even the complete code from esdhc_init() could go into the getcd()
> function instead or mmc_getcd() needs to be called at some later time
> after mmc_init(), which, however, would require many other drivers to
> change.
yes, the hook in the patch does not work for the fsl i.mx sdhc controller due to
silicon issues and we need always use gpio to read the card detection status.
>
> In addition to implementing the hook, this patch also removes the call
> to the board_mmc_getcd() function which is now called from the MMC
> framework and is no longer required here.
>
> Signed-off-by: Thierry Reding <thierry.red...@avionic-design.de>
> ---
Tested ok on i.mx51evk board,
Tested-by: Jason Liu <jason....@linaro.org>
> drivers/mmc/fsl_esdhc.c | 29 ++++++++++++-----------------
> 1 files changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
> index f038acc..1ed5355 100644
> --- a/drivers/mmc/fsl_esdhc.c
> +++ b/drivers/mmc/fsl_esdhc.c
> @@ -418,7 +418,6 @@ static int esdhc_init(struct mmc *mmc)
> struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
> struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
> int timeout = 1000;
> - int ret = 0;
>
> /* Reset the entire host controller */
> esdhc_write32(®s->sysctl, SYSCTL_RSTA);
> @@ -445,24 +444,19 @@ static int esdhc_init(struct mmc *mmc)
> /* Set timout to the maximum value */
> esdhc_clrsetbits32(®s->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16);
>
> - /* Check if there is a callback for detecting the card */
> - ret = board_mmc_getcd(mmc);
> - if (ret < 0) {
> - timeout = 1000;
> - while (!(esdhc_read32(®s->prsstat) & PRSSTAT_CINS) &&
> - --timeout)
> - udelay(1000);
> + return 0;
> +}
>
> - if (timeout <= 0)
> - ret = NO_CARD_ERR;
> - } else {
> - if (ret == 0)
> - ret = NO_CARD_ERR;
> - else
> - ret = 0;
> - }
> +static int esdhc_getcd(struct mmc *mmc)
> +{
> + struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
> + struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
> + int timeout = 1000;
> +
> + while (!(esdhc_read32(®s->prsstat) & PRSSTAT_CINS) && --timeout)
> + udelay(1000);
>
> - return ret;
> + return timeout > 0;
> }
>
> static void esdhc_reset(struct fsl_esdhc *regs)
> @@ -500,6 +494,7 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg
> *cfg)
> mmc->send_cmd = esdhc_send_cmd;
> mmc->set_ios = esdhc_set_ios;
> mmc->init = esdhc_init;
> + mmc->getcd = esdhc_getcd;
>
> voltage_caps = 0;
> caps = regs->hostcapblt;
> --
> 1.7.8.1
>
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