linux-kernel - Re: [PATCH] i2c: xiic: Make the start and the byte count write atomic

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Message-ID: <20180906185201.GG8607@kunai>
Date:   Thu, 6 Sep 2018 20:52:01 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     shubhrajyoti.datta@...il.com
Cc:     linux-i2c@...r.kernel.org, michal.simek@...inx.com,
        linux-kernel@...r.kernel.org,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: Re: [PATCH] i2c: xiic: Make the start and the byte count write atomic

On Mon, Sep 03, 2018 at 03:11:11PM +0530, shubhrajyoti.datta@...il.com wrote:
> From: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> 
> Disable interrupts while configuring the transfer and enable them back.
> 
> We have below as the programming sequence
> 1. start and slave address
> 2. byte count and stop
> 
> In some customer platform there was a lot of interrupts between 1 and 2
> and after slave address (around 7 clock cyles) if 2 is not executed
> then the transaction is nacked.
> 
> To fix this case make the 2 writes atomic.
> 
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>

Added a newline for better readability, added the stable tag and applied
to for-current, thanks!

BTW we have no maintainer for this driver. Would you or Michal be
interested in doing that? I don't maintain the whole driver directory
anymore.


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