linux-kernel - Re: [PATCH 2/6] i2c: qup: Add V2 tags support

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Date:	Thu, 26 Mar 2015 14:06:01 +0530
From:	Sricharan R <sricharan@...eaurora.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	agross@...eaurora.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org, galak@...eaurora.org,
	dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/6] i2c: qup: Add V2 tags support


Hi Ivan,

On 03/26/2015 01:01 PM, Ivan T. Ivanov wrote:
> Hi Sricharan,
>
> On Thu, 2015-03-26 at 11:14 +0530, Sricharan R wrote:
>>
>>>> +       if (msg->flags & I2C_M_RD)
>>>> +               qup->rx_tag_len = (qup->blocks << 1);
>>>
>>> here again.
>>>
>> hmm, why not shift ?
>
> Because it makes reading code harder and because compiler
>   is smart enough to choose appropriate instruction for
> underling CPU architecture.
>
ok.
>>>> +       else
>>>> +               qup->rx_tag_len = 0;
>>>> +}
>>>> +
>>>> +static u32 qup_i2c_xfer_data(struct qup_i2c_dev *qup, int len,
>>>> +                                                               u8 *buf, int last)
>>>> +{
>>>
>>> I think that xfer is too vague in this case, prefer write or send.
>>>
>> ok. Will change it to send.
>>>> +       static u32 val, idx;
>>>
>>> static? please fix.
>>    That was intentional. Using to pack tag and data in to one word across
>>    two calls. So preserving val, idx across calls.
>
> Sorry this is no go! Reorganize the code, please.
>
Ok, will change this function.

Regards,
  Sricharan
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