linux-kernel - Re: [PATCH 4/6] i2c: designware: Detect the FIFO size in the common code

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Date:   Sat, 21 Mar 2020 19:32:53 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     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>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] i2c: designware: Detect the FIFO size in the common
 code

On Fri, Mar 06, 2020 at 04:19:54PM +0300, Sergey.Semin@...kalelectronics.ru wrote:
> From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> The problem with detecting the FIFO depth in the platform driver
> is that in order to implement this we have to access the controller
> IC_COMP_PARAM_1 register. Currently it's done before the
> i2c_dw_set_reg_access() method execution, which is errors prone since
> the method determines the registers endianness and access mode and we
> can't use dw_readl/dw_writel accessors before this information is
> retrieved. We also can't move the i2c_dw_set_reg_access() function
> invocation to after the master/slave probe functions call (when endianness
> and access mode are determined), since the FIFO depth information is used
> by them for initializations. So in order to fix the problem we have no
> choice but to move the FIFO size detection methods to the common code and
> call it at the probe stage.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: linux-i2c@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Applied to for-next, thanks!


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