linux-kernel - Re: [PATCHv3] usb: typec: tps6598x: handle block writes separately with plain-I2C adapters

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Date:   Thu, 21 Feb 2019 09:41:44 +0100 (CET)
From:   Nikolaus Voss <nv@...n.de>
To:     Guenter Roeck <linux@...ck-us.net>
cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3] usb: typec: tps6598x: handle block writes separately
 with plain-I2C adapters

Hi Guenther,

On Wed, 20 Feb 2019, Guenter Roeck wrote:
> On 2/20/19 7:11 AM, Nikolaus Voss wrote:
>> From: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
>> 
>> Commit 1a2f474d328f handles block _reads_ separately with plain-I2C
>> adapters, but the problem described with regmap-i2c not handling
>> SMBus block transfers (i.e. read and writes) correctly also exists
>> with writes.
>> 
>> As workaround, this patch adds a block write function the same way
>> 1a2f474d328f adds a block read function.
>> 
>> Fixes: 1a2f474d328f ("usb: typec: tps6598x: handle block reads separately 
>> with plain-I2C adapters")
>> Fixes: 0a4c005bd171 ("usb: typec: driver for TI TPS6598x USB Power Delivery 
>> controllers")
>> Signed-off-by: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
>
> Note that tps6598x_exec_cmd() is only called with in_len == out_len == 0
> and NULL data pointers.

That's probably why I didn't notice I missed patching tps6598x_exec_cmd() 
in spite of running and testing the driver for half a year ;-).

Thanks,
Nikolaus