linux-kernel - [PATCH v3 0/3] usb: typec: tipd: fix event checking in interrupt service routines

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Message-Id: <20240429-tps6598x_fix_event_handling-v3-0-4e8e58dce489@wolfvision.net>
Date: Mon, 29 Apr 2024 15:35:56 +0200
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Abdel Alkuor <abdelalkuor@...tab.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>, stable@...r.kernel.org
Subject: [PATCH v3 0/3] usb: typec: tipd: fix event checking in interrupt
 service routines

The ISRs of the tps25750 and tps6598x do not handle generated events
properly under all circumstances.

The tps6598x ISR does not read all bits of the INT_EVENTX registers in
newer devices (tps65987 and tps65988, which have 11-byte interrupt
registers), leaving events signaled with bits above 64 unattended.
Moreover, these events are not cleared, leaving the interrupt enabled.

The tps25750 reads all bits of the INT_EVENT1 register, but the event
checking is not right because the same event is checked in two different
regions of the same register by means of an OR operation.

This series aims to fix both issues by reading all bits of the
INT_EVENTX registers, and limiting the event checking to the region
where the supported events are defined (currently they are limited to
the first 64 bits of the registers, as the are defined as BIT_ULL()).

In order to identify the interrupt register size, a simple mechanism has
been added to read the version register and select the right size
accordingly. This mechanism has been tested with a TPS65987DDHRSHR (DH
variant) which returned the expected value (0xF7).

If the need for events above the first 64 bits of the INT_EVENTX
registers arises, a different mechanism might be required. But for the
current needs, all definitions can be left as they are.

When at it, an explicit device_get_match_data() (which is already
contained in i2c_get_match_data()) has been removed.

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
Changes in v3:
- Remove explicit usage of device_get_match_data() (new patch).
- Fix series versioning (last resend should have been v2).
- Keep 64 bit reads in the interrupt handler for tps65981/2/6 by reading
  the version register.
- Link to v2: https://lore.kernel.org/r/20240328-tps6598x_fix_event_handling-v1-0-502721ff705b@wolfvision.net

Changes in v2:
- Add Cc tag for 'stable' (fixes).
- Link to v1: https://lore.kernel.org/r/20240325-tps6598x_fix_event_handling-v1-0-633fe0c87cc8@wolfvision.net/

---
Javier Carrasco (3):
      usb: typec: tipd: fix event checking for tps25750
      usb: typec: tipd: fix event checking for tps6598x
      usb: typec: tipd: rely on i2c_get_match_data()

 drivers/usb/typec/tipd/core.c     | 56 +++++++++++++++++++++++++--------------
 drivers/usb/typec/tipd/tps6598x.h | 11 ++++++++
 2 files changed, 47 insertions(+), 20 deletions(-)
---
base-commit: 4cece764965020c22cff7665b18a012006359095
change-id: 20240328-tps6598x_fix_event_handling-3398d3d82f85

Best regards,
-- 
Javier Carrasco <javier.carrasco@...fvision.net>