? 2016/3/2 9:29, Jaehoon Chung ??:
> Hi Shawn.
>
> On 03/01/2016 04:12 PM, Shawn Lin wrote:
>> Without MMC_CAP_ERASE support, we fail to mount partition
>> with "discard" option since mmc_queue_setup_discard is limited
>> for checking mmc_can_erase. Without doing mmc_queue_setup_discard,
>> blk_queue_discard fails to test QUEUE_FLAG_DISCARD flag, so we get
>> the following log from f2fs(actually similar to other file system):
>>
>> mounting with "discard" option, but the device does not support discard
>
> We can enable MMC_CAP_ERASE by default, since other SoC also needs this capability.
> I had sent some patch for enabling by default, but at that time i didn't remember why not enabled by default.
> I will check that reason..and share the information.
Hi Jaehoon,
Thanks for checking that. I didn't notice this part of code either until
I began to develop f2fs last month.
yes, I can't find any reasons not to enable it for dw_mmc because I look
more into dwmmc-databooks to see if any version of IP can't support
ERASE/TRIM command, and find none of them. So, enabling it by default is
safe.
>
> Best Regards,
> Jaehoon Chung
>
>>
>> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
>> ---
>>
>> drivers/mmc/host/dw_mmc-rockchip.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
>> index 84e50f3..2eda118 100644
>> --- a/drivers/mmc/host/dw_mmc-rockchip.c
>> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
>> @@ -234,11 +234,20 @@ static int dw_mci_rockchip_init(struct dw_mci *host)
>> return 0;
>> }
>>
>> +/* Common capabilities of RK3288 SoC */
>> +static unsigned long dw_mci_rk3288_dwmmc_caps[4] = {
>> + MMC_CAP_ERASE,
>> + MMC_CAP_ERASE,
>> + MMC_CAP_ERASE,
>> + MMC_CAP_ERASE,
>> +};
>> +
>> static const struct dw_mci_drv_data rk2928_drv_data = {
>> .init = dw_mci_rockchip_init,
>> };
>>
>> static const struct dw_mci_drv_data rk3288_drv_data = {
>> + .caps = dw_mci_rk3288_dwmmc_caps,
>> .set_ios = dw_mci_rk3288_set_ios,
>> .execute_tuning = dw_mci_rk3288_execute_tuning,
>> .parse_dt = dw_mci_rk3288_parse_dt,
>>
>
>
>
>
--
Best Regards
Shawn Lin
