linux-kernel - Re: [PATCH V4 3/9] i2c: xiic: Switch to Xiic standard mode for i2c-read

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Message-ID: <Y9032pA8GVFbWJ0I@shikoro>
Date:   Fri, 3 Feb 2023 17:35:38 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Manikanta Guntupalli <manikanta.guntupalli@....com>
Cc:     michal.simek@...inx.com, michal.simek@....com,
        devicetree@...r.kernel.org, andrew@...n.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, git@....com, srinivas.goud@....com,
        shubhrajyoti.datta@....com, manion05gk@...il.com,
        Raviteja Narayanam <raviteja.narayanam@...inx.com>
Subject: Re: [PATCH V4 3/9] i2c: xiic: Switch to Xiic standard mode for
 i2c-read

On Thu, Feb 02, 2023 at 03:11:32PM +0530, Manikanta Guntupalli wrote:
> From: Raviteja Narayanam <raviteja.narayanam@...inx.com>
> 
> Xilinx I2C IP has two modes of operation, both of which implement
> I2C transactions. The only difference from sw perspective is the
> programming sequence for these modes.
> Dynamic mode  -> Simple to program, less number of steps in sequence.
> Standard mode -> Gives flexibility, more number of steps in sequence.
> 
> In dynamic mode, during the i2c-read transactions, if there is a
> delay(> 200us) between the register writes (address & byte count),
> read transaction fails. On a system with load, this scenario is
> occurring frequently.
> To avoid this, switch to standard mode if there is a read request.
> 
> Added a quirk to identify the IP version effected by this and follow
> the standard mode.
> 
> Signed-off-by: Raviteja Narayanam <raviteja.narayanam@...inx.com>
> Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@....com>
> Acked-by: Michal Simek <michal.simek@....com>

Applied to for-next, thanks!


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