linux-kernel - [PATCH v5 0/1] i2c: Restore power status of device if probe fail or device is removed

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Message-Id: <20221109-i2c-waive-v5-0-2839667f8f6a@chromium.org>
Date:   Thu, 10 Nov 2022 17:20:38 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Wolfram Sang <wsa@...nel.org>, Tomasz Figa <tfiga@...omium.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     Hidenori Kobayashi <hidenorik@...gle.com>, stable@...r.kernel.org,
        linux-i2c@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 0/1] i2c: Restore power status of device if probe fail or device is removed

We have discovered that some power lines were always on even if the devices
on that power line was not used.

This happens because we failed to probe a device on the i2c bus, and the
ACPI Power Resource were never turned off.

This patch tries to fix this issue.

To: Wolfram Sang <wsa@...nel.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tomasz Figa <tfiga@...omium.org>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: Hidenori Kobayashi <hidenorik@...gle.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: linux-i2c@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Changes in v5:
- Add Cc: stable
- Add Reviewed-by Sakary (Thanks!)
- Renamed turn-off as power-off, in the name of consistency (Thanks Sergey!)
- Link to v4: https://lore.kernel.org/r/20221109-i2c-waive-v4-0-e4496462833b@chromium.org

Changes in v4:
- Rename full_power to do_power_on
- Link to v3: https://lore.kernel.org/r/20221109-i2c-waive-v3-0-d8651cb4b88d@chromium.org

Changes in v3:
- Introduce full_power variable to make more clear what we are doing.
- Link to v2: https://lore.kernel.org/r/20221109-i2c-waive-v2-0-07550bf2dacc@chromium.org

Changes in v2:
- Cover also device remove
- Link to v1: https://lore.kernel.org/r/20221109-i2c-waive-v1-0-ed70a99b990d@chromium.org

---
Ricardo Ribalda (1):
      i2c: Restore initial power state when we are done.

 drivers/i2c/i2c-core-base.c | 11 +++++++----
 include/linux/i2c.h         |  4 ++++
 2 files changed, 11 insertions(+), 4 deletions(-)
---
base-commit: f141df371335645ce29a87d9683a3f79fba7fd67
change-id: 20221109-i2c-waive-ae97fea1f1b5

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>