Hi Dinh,
According to DesignWare Spec, we need to check which bus-mode use.
You can refer to "https://patchwork.kernel.org/patch/1379521/";.
I know that hold_reg didn't use always, although hold_reg is set.
Best Regards,
Jaehoon Chung
On 12/14/2012 05:03 AM, dingu...@altera.com wrote:
> From: Dinh Nguyen <dingu...@altera.com>
>
> Add code to read value of the use_hold_reg in the cmd register so that
> the cmdflags can be correct.
>
> Signed-off-by: Dinh Nguyen <dingu...@altera.com>
> ---
> drivers/mmc/host/dw_mmc.c | 6 ++++++
> drivers/mmc/host/dw_mmc.h | 1 +
> include/linux/mmc/dw_mmc.h | 3 +++
> 3 files changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 323c502..490490b 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -265,6 +265,9 @@ static u32 dw_mci_prepare_command(struct mmc_host *mmc,
> struct mmc_command *cmd)
> if (drv_data && drv_data->prepare_command)
> drv_data->prepare_command(slot->host, &cmdr);
>
> + if (slot->host->use_hold_reg)
> + cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +
> return cmdr;
> }
>
> @@ -2183,6 +2186,9 @@ int dw_mci_probe(struct dw_mci *host)
> host->data_shift = 2;
> }
>
> + /* Get the USE_HOLD_REG */
> + host->use_hold_reg = mci_readl(host, CMD) & SDMMC_CMD_USE_HOLD_REG;
> +
> /* Reset all blocks */
> if (!mci_wait_reset(host->dev, host))
> return -ENODEV;
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 53b8fd9..6172900 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -111,6 +111,7 @@
> #define SDMMC_INT_ERROR 0xbfc2
> /* Command register defines */
> #define SDMMC_CMD_START BIT(31)
> +#define SDMMC_CMD_USE_HOLD_REG BIT(29)
> #define SDMMC_CMD_CCS_EXP BIT(23)
> #define SDMMC_CMD_CEATA_RD BIT(22)
> #define SDMMC_CMD_UPD_CLK BIT(21)
> diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
> index 34be4f4..36cab8a 100644
> --- a/include/linux/mmc/dw_mmc.h
> +++ b/include/linux/mmc/dw_mmc.h
> @@ -187,6 +187,9 @@ struct dw_mci {
> struct regulator *vmmc; /* Power regulator */
> unsigned long irq_flags; /* IRQ flags */
> int irq;
> +
> + /* Set to one for SDR12 and SDR25 */
> + unsigned int use_hold_reg;
> };
>
> /* DMA ops for Internal/External DMAC interface */
>
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
