linux-kernel - Re: [PATCH] i2c: designware: Use standard optional ref clock implementation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <YqdOvDmixVlDYzjO@shikoro>
Date:   Mon, 13 Jun 2022 16:50:36 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jan Dabros <jsd@...ihalf.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: designware: Use standard optional ref clock
 implementation

On Fri, Jun 10, 2022 at 10:42:33AM +0300, Serge Semin wrote:
> Even though the DW I2C controller reference clock source is requested by
> the method devm_clk_get() with non-optional clock requirement the way the
> clock handler is used afterwards has a pure optional clock semantic
> (though in some circumstances we can get a warning about the clock missing
> printed in the system console). There is no point in reimplementing that
> functionality seeing the kernel clock framework already supports the
> optional interface from scratch. Thus let's convert the platform driver to
> using it.
> 
> Note by providing this commit we get to fix two problems. The first one
> was introduced in commit c62ebb3d5f0d ("i2c: designware: Add support for
> an interface clock"). It causes not having the interface clock (pclk)
> enabled/disabled in case if the reference clock isn't provided. The second
> problem was first introduced in commit b33af11de236 ("i2c: designware: Do
> not require clock when SSCN and FFCN are provided"). Since that
> modification the deferred probe procedure has been unsupported in case if
> the interface clock isn't ready.
> 
> Fixes: c62ebb3d5f0d ("i2c: designware: Add support for an interface clock")
> Fixes: b33af11de236 ("i2c: designware: Do not require clock when SSCN and FFCN are provided")
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Applied to for-current, thanks!


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)