linux-kernel - [PATCH v2 0/6] Apple/PASemi i2c error recovery fixes

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Message-Id: <20250415-pasemi-fixes-v2-0-c543bf53151a@svenpeter.dev>
Date: Tue, 15 Apr 2025 15:36:54 +0000
From: Sven Peter via B4 Relay <devnull+sven.svenpeter.dev@...nel.org>
To: Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>, Andi Shyti <andi.shyti@...nel.org>, 
 Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>
Cc: linuxppc-dev@...ts.ozlabs.org, asahi@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Sven Peter <sven@...npeter.dev>, 
 Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v2 0/6] Apple/PASemi i2c error recovery fixes

Hi,

This series adds a few fixes/improvements to the error recovery for
Apple/PASemi i2c controllers.
The patches have been in our downstream tree and were originally used
to debug a rare glitch caused by clock strechting but are useful in
general. We haven't seen the controller misbehave since adding these.

Best,

Sven

Signed-off-by: Sven Peter <sven@...npeter.dev>
---
Changes in v2:
- Added commit to use the correct include (bits.h instead of bitfield.h)
- Added commit to sort includes
- Moved timeout explanations to code instead of just the commit log
- Made timeout recovery also work correctly in the interrupt case when
  waiting for the condition failed
- Used readx_poll_timeout instead of open-coded alternative
- Link to v1: https://lore.kernel.org/r/20250222-pasemi-fixes-v1-0-d7ea33d50c5e@svenpeter.dev

---
Hector Martin (3):
      i2c: pasemi: Improve error recovery
      i2c: pasemi: Enable the unjam machine
      i2c: pasemi: Log bus reset causes

Sven Peter (3):
      i2c: pasemi: Use correct bits.h include
      i2c: pasemi: Sort includes alphabetically
      i2c: pasemi: Improve timeout handling

 drivers/i2c/busses/i2c-pasemi-core.c | 114 ++++++++++++++++++++++++++++-------
 drivers/i2c/busses/i2c-pasemi-pci.c  |  10 +--
 2 files changed, 96 insertions(+), 28 deletions(-)
---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250220-pasemi-fixes-916cb77404ba

Best regards,
-- 
Sven Peter <sven@...npeter.dev>