linux-kernel - Re: [PATCH v2 17/22] watchdog: ziirave_wdt: Fix DOWNLOAD

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Message-ID: <20190815182330.GM14388@roeck-us.net>
Date:   Thu, 15 Aug 2019 11:23:30 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-watchdog@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Rick Ramstetter <rick@...eaterllc.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 17/22] watchdog: ziirave_wdt: Fix DOWNLOAD_END payload

On Mon, Aug 12, 2019 at 01:09:01PM -0700, Andrey Smirnov wrote:
> Bootloader firmware expects the following traffic for DOWNLOAD_END:
> 
> S Addr Wr [A] 0x11 [A] P
> 
> using ziirave_firm_write_byte() will result in
> 
> S Addr Wr [A] 0x11 [A] 0x01 [A] 0x01 [A] P
> 
> which happens to work because firmware will ignore any extra bytes
> sent. Fix this by converting the code to use i2c_smbus_write_byte()
> instead.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Rick Ramstetter <rick@...eaterllc.com>
> Cc: linux-watchdog@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Reviewed-by: Guenter Roeck <linux@...ck-us.net>