On 25 September 2012 18:00, <r66093@xxxxxxxxxxxxx> wrote:
> From: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
>
> CMD23 causes lots of errors in kernel on some freescale SoCs
> (P1020, P1021, P1022, P1024, P1025 and P4080) when MMC card used,
> which is because these controllers does not support CMD23,
> even on the SoCs which declares CMD23 is supported.
> Therefore, we'll not use CMD23.
>
> Signed-off-by: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
> Signed-off-by: Shaohui Xie <Shaohui.Xie@xxxxxxxxxxxxx>
> CC: Anton Vorontsov <cbouatmailru@xxxxxxxxx>
> CC: Chris Ball <cjb@xxxxxxxxxx>
> ---
> changes for v4:
> - change to detect the IP version
> - don't use callback function
> changes for v3:
> - move the limitation detect function to eSDHC file
> - add the callback funtion to do this limitation detect
> changes for v2:
> - discard the property mode and add the processor detection
>
> drivers/mmc/host/sdhci-of-esdhc.c | 33 +++++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-pltfm.c | 4 +++-
> drivers/mmc/host/sdhci-pltfm.h | 1 +
> drivers/mmc/host/sdhci.c | 3 +++
> include/linux/mmc/sdhci.h | 1 +
> 5 files changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index ae5fcbf..231672b 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -169,6 +169,38 @@ static void esdhc_of_resume(struct sdhci_host *host)
> }
> #endif
>
> +static void esdhc_of_detect_limitation(struct platform_device *pdev,
> + struct sdhci_pltfm_data *pdata)
> +{
> + void __iomem *ioaddr;
> + struct resource *iomem;
> + u32 vvn;
> +
> + iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!iomem) {
> + dev_err(&pdev->dev, "failed to get resource\n");
> + goto err;
> + }
> + if (resource_size(iomem) < 0x100)
> + dev_err(&pdev->dev, "Invalid iomem size!\n");
> +
> + ioaddr = ioremap(iomem->start, resource_size(iomem));
> + if (!ioaddr) {
> + dev_err(&pdev->dev, "failed to remap registers\n");
> + goto err;
> + }
> +
> + /* P102x and P4080 has IP version VVN2.2, CMD23 is not supported */
> + vvn = in_be32(ioaddr + SDHCI_SLOT_INT_STATUS);
> + vvn = (vvn & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
> + if (vvn == VENDOR_V_22)
> + pdata->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
> +
> + iounmap(ioaddr);
> +err:
> + return;
return a err value so that it is checked when called. If err then dont
have to proceed further.
> +}
> +
> static struct sdhci_ops sdhci_esdhc_ops = {
> .read_l = esdhc_readl,
> .read_w = esdhc_readw,
> @@ -199,6 +231,7 @@ static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
>
> static int __devinit sdhci_esdhc_probe(struct platform_device *pdev)
> {
> + esdhc_of_detect_limitation(pdev, &sdhci_esdhc_pdata);
In the above function there is a err value returned. Do you have to
proceed further even though there is a error?
> return sdhci_pltfm_register(pdev, &sdhci_esdhc_pdata);
> }
>
> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
> index 65551a9..4dd5770 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -132,8 +132,10 @@ struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
> host->ops = pdata->ops;
> else
> host->ops = &sdhci_pltfm_ops;
> - if (pdata)
> + if (pdata) {
> host->quirks = pdata->quirks;
> + host->quirks2 = pdata->quirks2;
> + }
> host->irq = platform_get_irq(pdev, 0);
>
> if (!request_mem_region(iomem->start, resource_size(iomem),
> diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
> index 37e0e18..283d54a 100644
> --- a/drivers/mmc/host/sdhci-pltfm.h
> +++ b/drivers/mmc/host/sdhci-pltfm.h
> @@ -18,6 +18,7 @@
> struct sdhci_pltfm_data {
> struct sdhci_ops *ops;
> unsigned int quirks;
> + unsigned int quirks2;
> };
>
> struct sdhci_pltfm_host {
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 0e15c79..b0b7cad 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2837,6 +2837,9 @@ int sdhci_add_host(struct sdhci_host *host)
> if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
> mmc->caps |= MMC_CAP_4_BIT_DATA;
>
> + if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
> + mmc->caps &= ~MMC_CAP_CMD23;
> +
> if (caps[0] & SDHCI_CAN_DO_HISPD)
> mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
>
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index fa8529a..1edcb4d 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -91,6 +91,7 @@ struct sdhci_host {
> unsigned int quirks2; /* More deviations from spec. */
>
> #define SDHCI_QUIRK2_HOST_OFF_CARD_ON (1<<0)
> +#define SDHCI_QUIRK2_HOST_NO_CMD23 (1<<1)
>
> int irq; /* Device IRQ */
> void __iomem *ioaddr; /* Mapped address */
> --
> 1.7.9.5
>
>
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