netdev - Re: Bug 216320 - KSZ8794 operation broken #forregzbot

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Message-ID: <7c41dd25-8bfa-c7b0-a430-1b115e8ee375@leemhuis.info>
Date:   Tue, 23 Aug 2022 18:47:24 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: Bug 216320 - KSZ8794 operation broken #forregzbot

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 17.08.22 15:36, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker.
>
> I noticed a regression report in bugzilla.kernel.org that afaics nobody
> acted upon since it was reported. That's why I decided to forward it by
> mail to those that afaics should handle this.
> 
> To quote from https://bugzilla.kernel.org/show_bug.cgi?id=216320 :
> 
>> After upgrading a Yocto build system from kernel 5.4 to 5.15, I found KSZ8794 switch operation was no longer functional. I got errors such as:
>>
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.770912] ksz8795-switch spi2.0: Unsupported interface: gmii, port: 0
>> Aug  1 22:23:17 tv999996 kern.warn kernel: [   10.777562] ksz8795-switch spi2.0 wan (uninitialized): validation of gmii with support 0000000,00000000,000062cf and advertisement 0000000,00000000,000062cf failed: -22
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.792874] ksz8795-switch spi2.0 wan (uninitialized): failed to connect to PHY: -EINVAL
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.800978] ksz8795-switch spi2.0 wan (uninitialized): error -22 setting up PHY for tree 0, switch 0, port 0
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.829188] ksz8795-switch spi2.0: Unsupported interface: gmii, port: 1
>> Aug  1 22:23:17 tv999996 kern.warn kernel: [   10.835821] ksz8795-switch spi2.0 lan2 (uninitialized): validation of gmii with support 0000000,00000000,000062cf and advertisement 0000000,00000000,000062cf failed: -22
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.851156] ksz8795-switch spi2.0 lan2 (uninitialized): failed to connect to PHY: -EINVAL
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.859358] ksz8795-switch spi2.0 lan2 (uninitialized): error -22 setting up PHY for tree 0, switch 0, port 1
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.892821] ksz8795-switch spi2.0: Unsupported interface: gmii, port: 2
>> Aug  1 22:23:17 tv999996 kern.warn kernel: [   10.899466] ksz8795-switch spi2.0 lan1 (uninitialized): validation of gmii with support 0000000,00000000,000062cf and advertisement 0000000,00000000,000062cf failed: -22
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.914845] ksz8795-switch spi2.0 lan1 (uninitialized): failed to connect to PHY: -EINVAL
>> Aug  1 22:23:17 tv999996 kern.err kernel: [   10.923052] ksz8795-switch spi2.0 lan1 (uninitialized): error -22 setting up PHY for tree 0, switch 0, port 2
>>
>> I found that if I reverted commit 2c709e0bdad4d996ec8925b9ee6d5b97458708f1, "net: dsa: microchip: ksz8795: add phylink support", then it worked properly again. The errors I saw were due to the checks in ksz8_validate() that were added in the above commit.
> Could somebody please take a look, especially if you're among the main
> recipients of this mail and not just CCed?
> 
> Anyway, to ensure this is not forgotten I'll add it to the Linux kernel
> regression tracking bot:
> 
> #regzbot introduced: 2c709e0bdad4d996ec8925b9ee6d5b97458708f1
> https://bugzilla.kernel.org/show_bug.cgi?id=216320

#regzbot fixed-by: 5fbb08eb7f945c7e88