linux-kernel - Re: [PATCH] MIPS: CI20: Update defconfig for EFUSE.

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Date:   Tue, 28 Jul 2020 17:40:01 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc:     tsbogend@...ha.franken.de, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, keescook@...omium.org,
        hns@...delico.com, ebiederm@...ssion.com,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, yanfei.li@...enic.com,
        sernia.zhou@...mail.com, zhenwenjin@...il.com
Subject: Re: [PATCH] MIPS: CI20: Update defconfig for EFUSE.

Hi Zhou,

Le sam. 25 juil. 2020 à 16:02, Zhou Yanjie <zhouyanjie@...yeetech.com> 
a écrit :
> Hi Paul,
> 
> 在 2020/7/23 下午4:47, Paul Cercueil 写道:
>> Hi Zhou,
>> 
>> Le jeu. 23 juil. 2020 à 15:19, 周琰杰 (Zhou Yanjie) 
>> <zhouyanjie@...yeetech.com> a écrit :
>>> The commit 19c968222934 ("MIPS: DTS: CI20: make DM9000 Ethernet
>>> controller use NVMEM to find the default MAC address") add EFUSE
>>> node for DM9000 in CI20, however, the EFUSE driver is not selected,
>>> which will cause the DM9000 to fail to read the MAC address from
>>> EFUSE, causing the following issue:
>>> 
>>> [FAILED] Failed to start Raise network interfaces.
>>> 
>>> Fix this problem by select CONFIG_JZ4780_EFUSE by default in the
>>> ci20_defconfig.
>> 
>> Does it actually fix it on a clean 5.8-rc kernel?
>> 
>> From what I know, the efuse driver cannot probe, because the nemc 
>> driver requests the complete memory resource, so the efuse driver's 
>> devm_platform_ioremap_resource() fails.
>> 
>> I did send a patch to fix this 
>> (https://lore.kernel.org/lkml/551a8560261543c1decb1d4d1671ec4b7fa52fdb.1582905653.git.hns@goldelico.com/),
>> but it's hard to have somebody merge it, because nobody maintains 
>> drivers/memory/.
>> 
> You are right, I cleaned up the changes made to support X1000's EFUSE 
> and rebase to clean 5.8-RC6, it still does not work properly, I think 
> we should drop this fix patch.

The patch I mentioned was merged, so starting from 5.9-rc1 the efuse 
driver should work. Please resend this patch after 5.9-rc1 then.

Thanks,
-Paul

> 
>>> Fixes: 19c968222934 ("MIPS: DTS: CI20: make DM9000 Ethernet
>>> controller use NVMEM to find the default MAC address").
>> 
>> That shouldn't be a fix IMHO - the devicetree was updated in one 
>> commit, the config should be updated in another. The "bug" here is 
>> that it wasn't done right away.
>> 
> Okay.
>>> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
>> 
>> Btw - when you add a Fixes: tag to fix a commit that is not for the 
>> kernel currently in RC phase, you need to Cc linux-stable as well.
>> 
> Sure, I will pay attention next time.
> 
> Thanks and best regards!
> 
> 
>> Cheers,
>> -Paul
>> 
>>> ---
>>>  arch/mips/configs/ci20_defconfig | 1 +
>>>  1 file changed, 1 insertion(+)
>>> 
>>> diff --git a/arch/mips/configs/ci20_defconfig 
>>> b/arch/mips/configs/ci20_defconfig
>>> index f433fad16073..ba26ba4de09a 100644
>>> --- a/arch/mips/configs/ci20_defconfig
>>> +++ b/arch/mips/configs/ci20_defconfig
>>> @@ -140,6 +140,7 @@ CONFIG_INGENIC_OST=y
>>>  CONFIG_MEMORY=y
>>>  CONFIG_PWM=y
>>>  CONFIG_PWM_JZ4740=m
>>> +CONFIG_JZ4780_EFUSE=y
>>>  CONFIG_EXT4_FS=y
>>>  # CONFIG_DNOTIFY is not set
>>>  CONFIG_AUTOFS_FS=y
>>> --
>>> 2.11.0
>>> 
>>