Message-id: <56EB5E3F.7010701@samsung.com>
Date: Fri, 18 Mar 2016 10:47:43 +0900
From: Jaehoon Chung <jh80.chung@samsung.com>
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To: Shawn Lin <shawn.lin@rock-chips.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>, linux-rockchip@lists.infradead.org,
        linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc-rockchip: fix failing to mount partition with
 "discard"
References: <1456816373-32518-1-git-send-email-shawn.lin@rock-chips.com>
 <56D641FA.8010606@samsung.com> <56EAD13D.8050400@rock-chips.com>
In-reply-to: <56EAD13D.8050400@rock-chips.com>
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Hi Shawn,

On 03/18/2016 12:46 AM, Shawn Lin wrote:
> Hi jaehoon,
> 
> On 2016/3/2 9:29, Jaehoon Chung wrote:
>> 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.
>>
> 
> Any good news? :)
> Or let add it for dw_mmc by default?

Sorry for replying too late..I had other tasks..:(
Today or Tomorrow, i will apply the patches related with dw-mmcc controller.
And will request to pull to Ulf.

I didn't check...but i think this patch will be applied on dw_mmc-rockchip.
After then..we can use it by default in future.

Refer to below.
https://patchwork.kernel.org/patch/4240491/

Best Regards,
Jaehoon Chung

> 
>> Best Regards,
>> Jaehoon Chung
>>
>>>
>>> Signed-off-by: Shawn Lin <shawn.lin@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,
>>>
>>
>>
>> _______________________________________________
>> Linux-rockchip mailing list
>> Linux-rockchip@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-rockchip
>>
> 
>