linux-kernel - Re: [PATCH 00/10] i2c: move handling of suspended adapters to the core

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Date:   Tue, 8 Jan 2019 21:09:38 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Hans de Goede <hdegoede@...hat.com>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 00/10] i2c: move handling of suspended adapters to the
 core

On Wed, Dec 19, 2018 at 05:48:16PM +0100, Wolfram Sang wrote:
> Finally, here is the implementation Hans and I agreed on. Plus, all potential
> users I could spot already converted. Renesas R-Car driver was added on top.
> This series was tested on a Renesas Lager board (R-Car H2). I had to hack some
> error cases into the code to verify the workings. Thanks for all the tests so
> far. Of course, more testing never hurts ;)
> 
> Please comment, review, test... a branch can be found here:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/core-pm-helpers
> 
> Thanks,
> 
>    Wolfram
> 
> Changes since RFC:
> 
> * don't use bitfields anymore but an unsigned long flags variable which is only
>   meant for flags to be changed when the adapter lock is held
> 
> * split the genereic accessor into _mark_suspended() and _mark_resumed()
> 
> * added kerneldoc and noted that using these helpers is optional
> 
> * documented -ESHUTDOWN as the error code when trying to transfer using an
>   already suspended adapter
> 
> * added acks from last series. Changes were minor enough to keep them. Please let
>   me know if you disagree.
> 
> 
> Wolfram Sang (10):
>   i2c: add suspended flag and accessors for i2c adapters
>   i2c: reject new transfers when adapters are suspended
>   i2c: synquacer: remove unused is_suspended flag
>   i2c: brcmstb: use core helper to mark adapter suspended
>   i2c: zx2967: use core helper to mark adapter suspended
>   i2c: sprd: don't use pdev as variable name for struct device *
>   i2c: sprd: use core helper to mark adapter suspended
>   i2c: exynos5: use core helper to mark adapter suspended
>   i2c: s3c2410: use core helper to mark adapter suspended
>   i2c: rcar: add suspend/resume support

After a long road, I applied this series now to for-next. I only
squashed patches 1+2 to have the functionality in one place. And fixed a
typo in patch 1. Thanks to the testers and reviewers, and especially
Hans, for the input and discussions.

This will now get a full test cycle in -next. Let's see what happens...

And let's move on to how to add 'very late transfers without irqs' on
top of this series.

Happy hacking,

   Wolfram


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