Hi, Chris,
Could you have any comment about this patch?
Can it go into 3.3 or 3.4?
Thanks
Jerry Huang
> -----Original Message-----
> From: Huang Changming-R66093
> Sent: Friday, December 09, 2011 10:54 AM
> To: linux-mmc@xxxxxxxxxxxxxxx
> Cc: Huang Changming-R66093; Chris Ball
> Subject: [PATCH 4/4 v3] 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: 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
>
> drivers/mmc/host/sdhci-of-esdhc.c | 25 ++++++++++++++++++++++++-
> 1 files changed, 24 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-
> of-esdhc.c
> index 59e9d00..40da8f4 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -1,7 +1,7 @@
> /*
> * Freescale eSDHC controller driver.
> *
> - * Copyright (c) 2007, 2010 Freescale Semiconductor, Inc.
> + * Copyright (c) 2007, 2010-2011 Freescale Semiconductor, Inc.
> * Copyright (c) 2009 MontaVista Software, Inc.
> *
> * Authors: Xiaobo Xie <X.Xie@xxxxxxxxxxxxx>
> @@ -82,6 +82,28 @@ static unsigned int esdhc_of_get_min_clock(struct
> sdhci_host *host)
> return pltfm_host->clock / 256 / 16;
> }
>
> +/* 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 = sdhci_be32bs_readl,
> .read_w = esdhc_readw,
> @@ -93,6 +115,7 @@ static struct sdhci_ops sdhci_esdhc_ops = {
> .enable_dma = esdhc_of_enable_dma,
> .get_max_clock = esdhc_of_get_max_clock,
> .get_min_clock = esdhc_of_get_min_clock,
> + .get_cd = esdhc_of_get_cd,
> };
>
> static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
> --
> 1.7.5.4
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