On 17 July 2012 13:16, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
> Hi Girish,
>
> On 07/16/2012 05:45 PM, Girish K S wrote:
>> In some Soc'S that integrate Designware mmc host controllers, the
>> HCON register is broken. The hardware configuration is not
>> updated. One specific usecase is the IDMAC. In Exysons5 SoC
>> there exist a internal DMA, but the HCON register's DMA_INTERFACE
>> field is not set to indicate its existance.
>>
>> This quirk can be used in such case to force the existance broken
>> HCON field.
>>
>> Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
>> ---
>> drivers/mmc/host/dw_mmc-pltfm.c | 5 +++++
>> drivers/mmc/host/dw_mmc.c | 11 ++++++++++-
>> drivers/mmc/host/dw_mmc.h | 1 +
>> include/linux/mmc/host.h | 1 +
>> 4 files changed, 17 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
>> index 900f412..24ea485 100644
>> --- a/drivers/mmc/host/dw_mmc-pltfm.c
>> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
>> @@ -35,9 +35,14 @@ static unsigned long exynos5250_dwmmc_caps[4] = {
>> MMC_CAP_CMD23,
>> };
>>
>> +static unsigned long exynos5250_dwmmc_caps2[1] = {
>> + MMC_CAP2_CONFIG_BROKEN,
>> +};
>> +
>> static struct dw_mci_drv_data exynos5250_drv_data = {
>> .ctrl_type = DW_MCI_TYPE_EXYNOS5250,
>> .caps = exynos5250_dwmmc_caps,
>> + .caps2 = exynos5250_dwmmc_caps2,
>> };
>>
>> static const struct of_device_id dw_mci_pltfm_match[] = {
>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
>> index 1a59a92..030224c 100644
>> --- a/drivers/mmc/host/dw_mmc.c
>> +++ b/drivers/mmc/host/dw_mmc.c
>> @@ -431,7 +431,13 @@ static int dw_mci_idmac_init(struct dw_mci *host)
>> /* Check if Hardware Configuration Register has support for DMA */
>> dma_support = (mci_readl(host, HCON) >> 16) & 0x3;
>>
>> - if (!dma_support || dma_support > 2) {
>> + /*
>> + * In Some of the Soc's the HCON Register is broken. Even though the
>> + * Soc's has a internal DMA the HCON register's DMA field doesnt
>> + * show it. So additional quirk is added for such Soc's
>> + */
>> + if ((!dma_support || dma_support > 2) &&
>> + !((u32)host->drv_data->caps2 & MMC_CAP2_CONFIG_BROKEN)) {
> Just caps2? if use the device tree, need to get ctrl_id?
but i found one thing. I have initialized only one channel. are you
mentioning to initialize all 4 channels of exynos5
> It didn't work..
>> dev_err(&host->dev,
>> "Host Controller does not support IDMA Tx.\n");
>> host->dma_ops = NULL;
>> @@ -1957,6 +1963,9 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>> if (host->pdata->caps2)
>> mmc->caps2 = host->pdata->caps2;
>>
>> + if (host->drv_data->caps2)
>> + mmc->caps2 |= host->drv_data->caps2[ctrl_id];
>> +
>> if (host->pdata->get_bus_wd) {
>> if (host->pdata->get_bus_wd(slot->id) >= 4)
>> mmc->caps |= MMC_CAP_4_BIT_DATA;
>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
>> index 6c17282..8c4810a 100644
>> --- a/drivers/mmc/host/dw_mmc.h
>> +++ b/drivers/mmc/host/dw_mmc.h
>> @@ -203,6 +203,7 @@ extern int dw_mci_resume(struct dw_mci *host);
>> struct dw_mci_drv_data {
>> unsigned long ctrl_type;
>> unsigned long *caps;
>> + unsigned long *caps2;
>> };
>>
>> #endif /* _DW_MMC_H_ */
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index 65c64ee..ab5c7f9 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -261,6 +261,7 @@ struct mmc_host {
>> #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */
>> #define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */
>> #define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */
>> +#define MMC_CAP2_CONFIG_BROKEN (1 << 12) /* Broken Config Register */
>>
>> mmc_pm_flag_t pm_caps; /* supported pm features */
>> unsigned int power_notify_type;
>>
>
>
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