On 21 September 2012 15:55, <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 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 | 30 ++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-pltfm.c | 3 +++
> drivers/mmc/host/sdhci.c | 3 +++
> drivers/mmc/host/sdhci.h | 1 +
> include/linux/mmc/sdhci.h | 1 +
> 5 files changed, 38 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index f8eb1fb..2f40a7f 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -143,6 +143,35 @@ static void esdhc_of_resume(struct sdhci_host *host)
> }
> #endif
>
> +static const u32 non_cmd23_processor_table[] = {
> + /* P1020 Dual/Single core */
> + 0x80EC00, 0x80E400, 0x80ED00, 0x80E500,
> + /* P1021 Dual/Single core */
> + 0x80EC01, 0x80E401, 0x80ED01, 0x80E501,
> + /* P1022 Dual/Single core */
> + 0x80EE00, 0x80E600, 0x80EF00, 0x80E700,
> + /* P1024 Dual/Single core */
> + 0x80EC02, 0x80E402, 0x80ED02, 0x80E502,
> + /* P1025 Dual/Single core */
> + 0x80EC03, 0x80E403, 0x80ED03, 0x80E503,
> + /* P4080 and P4040 */
> + 0x820000, 0x820800, 0x820100, 0x820900
> +};
> +
> +void esdhc_of_detect_limitation(struct sdhci_host *host)
> +{
> + u32 svr = mfspr(SPRN_SVR) >> 8;
> + u32 table_size = ARRAY_SIZE(non_cmd23_processor_table);
> + int i;
> +
> + for (i = 0; i < table_size; i++) {
> + if (non_cmd23_processor_table[i] == svr) {
> + host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
> + break;
> + }
> + }
> +}
> +
> static struct sdhci_ops sdhci_esdhc_ops = {
> .read_l = sdhci_be32bs_readl,
> .read_w = esdhc_readw,
> @@ -158,6 +187,7 @@ static struct sdhci_ops sdhci_esdhc_ops = {
> .platform_suspend = esdhc_of_suspend,
> .platform_resume = esdhc_of_resume,
> #endif
> + .platform_limitation = esdhc_of_detect_limitation,
> };
>
> static struct sdhci_pltfm_data sdhci_esdhc_pdata = {
> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
> index d9a4ef4..864bedd 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -185,6 +185,9 @@ int sdhci_pltfm_register(struct platform_device *pdev,
>
> sdhci_get_of_property(pdev);
>
> + if (host->ops->platform_limitation)
> + host->ops->platform_limitation(host);
> +
In your Soc specific sdhci-xxxx.c probe function you need to call
sdhci_pltfm_register function. And before calling this function you
can check for the above inserted code.
this will keep the sdhci-pltfm.c unchanged and also avoids the
additional callback in the generic header file
> ret = sdhci_add_host(host);
> if (ret)
> sdhci_pltfm_free(pdev);
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 9a11dc3..6208a8b 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2795,6 +2795,9 @@ 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/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 97653ea..4296bef 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -278,6 +278,7 @@ struct sdhci_ops {
> void (*hw_reset)(struct sdhci_host *host);
> void (*platform_suspend)(struct sdhci_host *host);
> void (*platform_resume)(struct sdhci_host *host);
> + void (*platform_limitation)(struct sdhci_host *host);
> };
>
> #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index ac83b10..97c73f5 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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