linux-kernel - [PATCH v6 0/1] i2c: Restore power status of device if probe fails

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Date:   Mon, 14 Nov 2022 13:20:33 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>
Cc:     Hidenori Kobayashi <hidenorik@...omium.org>,
        stable@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org,
        Hidenori Kobayashi <hidenorik@...gle.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-i2c@...r.kernel.org
Subject: [PATCH v6 0/1] i2c: Restore power status of device if probe fails

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: Mika Westerberg <mika.westerberg@...ux.intel.com>
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 v6:
- Add Reviewed-by: Hidenori (Thanks!).
- Set device always off at remove.
- Link to v5: https://lore.kernel.org/r/20221109-i2c-waive-v5-0-2839667f8f6a@chromium.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 if probe fails

 drivers/i2c/i2c-core-base.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
base-commit: f141df371335645ce29a87d9683a3f79fba7fd67
change-id: 20221109-i2c-waive-ae97fea1f1b5

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