Hi, Anton,
No any feedback since posted.
Could you give some comment about it?
Best Regards
Jerry Huang
> -----Original Message-----
> From: Huang Changming-R66093
> Sent: Tuesday, October 30, 2012 4:13 PM
> To: linux-mmc@xxxxxxxxxxxxxxx
> Cc: Huang Changming-R66093; Anton Vorontsov; Chris Ball
> Subject: [PATCH 4/4 v4] ESDHC: add callback esdhc_of_get_cd to detect
> card
>
> From: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
>
> In order to check if the card is present, we will read the PRESENT STATE
> register and check the bit13(Card detect pin level) and bit15(CINS).
>
> Signed-off-by: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
> CC: Anton Vorontsov <cbouatmailru@xxxxxxxxx>
> CC: Chris Ball <cjb@xxxxxxxxxx>
> ---
> changes for v2:
> - add new callback for esdhc to detect the card state
> - add the CC
> changes for v3:
> - enable the controller clock when detect the card state, not core
> changes for v4:
> - based on the latest version
>
> drivers/mmc/host/sdhci-of-esdhc.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-
> of-esdhc.c
> index 63d219f..7053218 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -179,6 +179,28 @@ static void esdhc_of_platform_init(struct sdhci_host
> *host)
> host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
> }
>
> +/* Return: none zero - the card is presetn; 0 - card is absent */
> +static int esdhc_of_get_cd(struct sdhci_host *host)
> +{
> + int present;
> +
> + if (host->flags & SDHCI_DEVICE_DEAD)
> + present = 0;
> + else {
> + int sysctl = sdhci_be32bs_readl(host, SDHCI_CLOCK_CONTROL);
> + /* Enable the controller clock to update the present state */
> + sdhci_be32bs_writel(host, sysctl | SDHCI_CLOCK_INT_EN,
> + SDHCI_CLOCK_CONTROL);
> + /* Detect the card present or absent */
> + present = sdhci_be32bs_readl(host, SDHCI_PRESENT_STATE);
> + present &= (SDHCI_CARD_PRESENT | SDHCI_CARD_CDPL);
> + /* Resve the previous to System control register */
> + sdhci_be32bs_writel(host, sysctl, SDHCI_CLOCK_CONTROL);
> + }
> +
> + return present;
> +}
> +
> static struct sdhci_ops sdhci_esdhc_ops = {
> .read_l = esdhc_readl,
> .read_w = esdhc_readw,
> @@ -191,6 +213,7 @@ static struct sdhci_ops sdhci_esdhc_ops = {
> .get_max_clock = esdhc_of_get_max_clock,
> .get_min_clock = esdhc_of_get_min_clock,
> .platform_init = esdhc_of_platform_init,
> + .get_cd = esdhc_of_get_cd,
> #ifdef CONFIG_PM
> .platform_suspend = esdhc_of_suspend,
> .platform_resume = esdhc_of_resume,
> --
> 1.7.9.5
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