netdev - Re: [net-next,PATCH v7 2/8] net: stmmac: dwmac-stm32: Separate out external clock rate validation

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Date: Wed, 26 Jun 2024 11:38:57 +0100
From: Mark Brown <broonie@...nel.org>
To: Christophe Roullier <christophe.roullier@...s.st.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Richard Cochran <richardcochran@...il.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Liam Girdwood <lgirdwood@...il.com>, Marek Vasut <marex@...x.de>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next,PATCH v7 2/8] net: stmmac: dwmac-stm32: Separate out
 external clock rate validation

On Tue, Jun 11, 2024 at 10:36:00AM +0200, Christophe Roullier wrote:
> From: Marek Vasut <marex@...x.de>
> 
> Pull the external clock frequency validation into a separate function,
> to avoid conflating it with external clock DT property decoding and
> clock mux register configuration. This should make the code easier to
> read and understand.

For the past few days networking has been broken on the Avenger 96, a
stm32mp157a based platform.  The stm32-dwmac driver fails to probe:

<6>[    1.894271] stm32-dwmac 5800a000.ethernet: IRQ eth_wake_irq not found
<6>[    1.899694] stm32-dwmac 5800a000.ethernet: IRQ eth_lpi not found
<6>[    1.905849] stm32-dwmac 5800a000.ethernet: IRQ sfty not found
<3>[    1.912304] stm32-dwmac 5800a000.ethernet: Unable to parse OF data
<3>[    1.918393] stm32-dwmac 5800a000.ethernet: probe with driver stm32-dwmac failed with error -75

which looks a bit odd given the commit contents but I didn't look at the
driver code at all.

Full boot log here:

   https://lava.sirena.org.uk/scheduler/job/467150

A working equivalent is here:

   https://lava.sirena.org.uk/scheduler/job/466518

A bisection identified this commit as being responsible, log below:

git bisect start
# status: waiting for both good and bad commits
# bad: [0fc4bfab2cd45f9acb86c4f04b5191e114e901ed] Add linux-next specific files for 20240625
git bisect bad 0fc4bfab2cd45f9acb86c4f04b5191e114e901ed
# status: waiting for good commit(s), bad commit known
# good: [3d9217c41c07b72af3a5c147cb82c75f757f4200] Merge branch 'for-linux-next-fixes' of https://gitlab.freedesktop.org/drm/misc/kernel.git
git bisect good 3d9217c41c07b72af3a5c147cb82c75f757f4200
# bad: [5699faecf4e2347f81eea62db0455feb4d794537] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
git bisect bad 5699faecf4e2347f81eea62db0455feb4d794537
# good: [ba73da675606373565868962ad8c615f175662ed] Merge branch 'fs-next' of linux-next
git bisect good ba73da675606373565868962ad8c615f175662ed
# bad: [7e7c714a36a5b10e391168e7e8145060e041ea12] Merge branch 'af_unix-remove-spin_lock_nested-and-convert-to-lock_cmp_fn'
git bisect bad 7e7c714a36a5b10e391168e7e8145060e041ea12
# good: [93d4e8bb3f137e8037a65ea96f175f81c25c50e5] Merge tag 'wireless-next-2024-06-07' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next
git bisect good 93d4e8bb3f137e8037a65ea96f175f81c25c50e5
# bad: [4314175af49668ab20c0d60d7d7657986e1d0c7c] Merge branch 'net-smc-IPPROTO_SMC'
git bisect bad 4314175af49668ab20c0d60d7d7657986e1d0c7c
# good: [811efc06e5f30a57030451b2d1998aa81273baf8] net/tcp: Move tcp_inbound_hash() from headers
git bisect good 811efc06e5f30a57030451b2d1998aa81273baf8
# good: [5f703ce5c981ee02c00e210d5b155bbbfbf11263] net: hsr: Send supervisory frames to HSR network with ProxyNodeTable data
git bisect good 5f703ce5c981ee02c00e210d5b155bbbfbf11263
# bad: [6c3282a6b296385bee2c383442c39f507b0d51dd] net: stmmac: add select_pcs() platform method
git bisect bad 6c3282a6b296385bee2c383442c39f507b0d51dd
# bad: [404dbd26322f50c8123bf5bff9a409356889035f] net: qrtr: ns: Ignore ENODEV failures in ns
git bisect bad 404dbd26322f50c8123bf5bff9a409356889035f
# bad: [c60a54b52026bd2c9a88ae00f2aac7a67fed8e38] net: stmmac: dwmac-stm32: Clean up the debug prints
git bisect bad c60a54b52026bd2c9a88ae00f2aac7a67fed8e38
# bad: [582ac134963e2d5cf6c45db027e156fcfb7f7678] net: stmmac: dwmac-stm32: Separate out external clock rate validation
git bisect bad 582ac134963e2d5cf6c45db027e156fcfb7f7678
# good: [8a9044e5169bab7a8edadb4ceb748391657f0d7f] dt-bindings: net: add STM32MP13 compatible in documentation for stm32
git bisect good 8a9044e5169bab7a8edadb4ceb748391657f0d7f
# first bad commit: [582ac134963e2d5cf6c45db027e156fcfb7f7678] net: stmmac: dwmac-stm32: Separate out external clock rate validation

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