linux-kernel - Re: [PATCH V4]mmc: dw_mmc-k3: UHS-SD card for Hisilicon Hikey

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Message-ID: <49dcf25e-116e-b0d8-fbaf-4f23488433d3@hisilicon.com>
Date:   Tue, 23 Aug 2016 17:00:22 +0800
From:   Jinguojun <kid.jin@...ilicon.com>
To:     Jaehoon Chung <jh80.chung@...sung.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <ulf.hansson@...aro.org>,
        <adrian.hunter@...el.com>, <wsa+renesas@...g-engineering.com>,
        <arnd@...db.de>, <rmk+kernel@....linux.org.uk>
CC:     <guodong.xu@...aro.org>, <kongfei@...ilicon.com>,
        <suzhuangluan@...ilicon.com>
Subject: Re: [PATCH V4]mmc: dw_mmc-k3: UHS-SD card for Hisilicon Hikey

Hi

On 2016/8/17 15:20, Jaehoon Chung wrote:
> On 08/17/2016 03:11 PM, Jinguojun wrote:
>> Hi
>>
>> On 2016/8/8 18:46, Jaehoon Chung wrote:
>>> Hi,
>>>
>>> On 08/08/2016 06:10 PM, Shawn Lin wrote:
>>>> Hi guy,
>>>>
>>>> On 2016/8/8 15:10, Jinguojun wrote:
>>>>> Hi,maintainers
>>>>>
>>>>> Pls help to review code,this is the newest patch after your advise
>>>
>>> Subject..
>>>
>>> s/UHS-SD/UHS-I/
>>>
>>>>>
>>>>
>>>> Please give Jaehoon more time to review your patch before sending a
>>>> ping or resending one(~2 weeks), as it's only four days(weekend
>>>> included) since v4 was done....IMHO, it's quite bold...
>>>>
>>>>> Thx
>> I apologize for my rudeness.
> 
> Don't mind. Feel free to tell me anytime! :)
> 
>>>>> On 2016/8/4 10:16, Jin Guojun wrote:
>>>>>> mmc: dw_mmc-k3: Hisilicon Hikey have no tuning function in
>>>>>> dw_mmc-k3.c,so we must do the tuning function stub when we init UHS card.
>>>>>>
>>>>
>>>> Hrmmm....  remove "mmc: dw_mmc-k3:" from the meat of commit msg。
>>>>
>>>> And you do nothing for dw_mci_hi6220_execute_tuning, why?
>>>> Could you elaborate more..
>>>>
>>>>
>> OK I'll remove the mmc: dw_mmc-k3:,Then Hikey can't support SDR104,so we only support SDR12 SDR25 SD50,and we do not need to do tuning for these modes.
>>>>>> V1:add .prepare_command in dw_mmc.c
>>>>>> V2:delete .prepare_command, add err = 0 in dw_mci_execute_tuning
>>>>>> V3:delete err = 0 in dw_mci_execute_tuning,add .execute_tuning in
>>>>>> dw_mmc-k3.c
>>>>>> V4:add "linux-mmc@...r.kernel.org", patch version, Changelog, etc..
>>>>
>>>> The changelog is totally wrong, namely it should not be listed in the
>>>> commit msg...
>>>>
>> OK I'll delete this part
>>>>>>
>>>>>> Signed-off-by: Jin Guojun <kid.jin@...ilicon.com>
>>>>>> ---
>>>>>>  drivers/mmc/host/dw_mmc-k3.c | 6 ++++++
>>>>>>  1 file changed, 6 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
>>>>>> index 8e9d886..6247894 100644
>>>>>> --- a/drivers/mmc/host/dw_mmc-k3.c
>>>>>> +++ b/drivers/mmc/host/dw_mmc-k3.c
>>>>>> @@ -131,11 +131,17 @@ static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
>>>>>>      host->bus_hz = clk_get_rate(host->biu_clk);
>>>>>>  }
>>>>>>
>>>>>> +static int dw_mci_hi6220_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
>>>>>> +{
>>>>>> +    return 0;
>>>>>> +}
>>>
>>>
>>> All of UHS-I cards didn't need to do tuning sequence on your SoC? it's strange.
>>>
>>> I think we can fix more exactly in dw_mmc.c
>>> As i know, some UHS cards don't need to send the tuning sequence.
>>> (If i know wrong, let me know plz.)
>>>
>>> But just skipping execute_tuning..I think it's not correct.
>>>
>>> Best Regards,
>>> Jaehoon Chung
>>>
>> We cant support SDR104 currently.We only turn on SDR12 SDR25 SDR50.
> 
> I will send the patch for execute_tuning in dwmmc.c within this week.
> After that, could you check that patch? I will add your email to CC. How about?
> 
> I think it's better than using the dummy function. :)
> 
> Best Regards,
> Jaehoon Chung
> 
OK when you finish the patch,pls give me the modefy
thx
>>>>>> +
>>>>>>  static const struct dw_mci_drv_data hi6220_data = {
>>>>>>      .caps            = dw_mci_hi6220_caps,
>>>>>>      .switch_voltage        = dw_mci_hi6220_switch_voltage,
>>>>>>      .set_ios        = dw_mci_hi6220_set_ios,
>>>>>>      .parse_dt        = dw_mci_hi6220_parse_dt,
>>>>>> +    .execute_tuning        = dw_mci_hi6220_execute_tuning,
>>>>>>  };
>>>>>>
>>>>>>  static const struct of_device_id dw_mci_k3_match[] = {
>>>>>>
>>>>>
>>>>> -- 
>>>>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>>>>> the body of a message to majordomo@...r.kernel.org
>>>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>>>
>>>>
>>>>
>>>
>>>
>>> .
>>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>>
>>
> 
> 
> .
>