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

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Date:   Thu, 23 Jul 2020 10:47:19 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <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 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/.

> 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.

> 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.

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
>