RE: [PATCH v2 2/2] i2c: qup: support SMBus block read

From	"Sricharan" <sricharan@codeaurora.org>
Newsgroups	linux.kernel
Subject	RE: [PATCH v2 2/2] i2c: qup: support SMBus block read
Date	2016-05-20 10:40 +0200
Message-ID	<rAO8q-3ca-13@gated-at.bofh.it> (permalink)
References	<rxL73-U4-5@gated-at.bofh.it> <rxL73-U4-3@gated-at.bofh.it> <rA3Md-7f3-1@gated-at.bofh.it> <rACAh-4uH-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi,

<snip..>
>>> @@ -1128,6 +1173,22 @@ static int qup_i2c_read_one_v2(struct
>>> qup_i2c_dev *qup, struct i2c_msg *msg)
>>>   			goto err;
>>>
>>>   		qup->blk.pos++;
>>> +
>>> +		/* Handle SMBus block read length */
>>> +		if (qup_i2c_check_msg_len(msg) && (msg->len == 1)) {
>>> +			if (msg->buf[0] > I2C_SMBUS_BLOCK_MAX) {
>>> +				ret = -EPROTO;
>>> +				goto err;
>>> +			}
>>> +			msg->len += msg->buf[0];
>>> +			qup->pos = 0;
>>> +			qup_i2c_set_read_mode_v2(qup, msg->len);
>>> +			qup_i2c_issue_xfer_v2(qup, msg);
>>> +			ret = qup_i2c_wait_for_complete(qup, msg);
>>> +			if (ret)
>>> +				goto err;
>> 		Is the issue_xfer_v2 needed inside this here ?
>No, qup_i2c_issue_xfer_v2 is needed so that we read rest of the data
>that is indicated by the length we read earlier.

So qup_i2c_issue_xfer_v2 writes the tags and there is one already in the loop above this
 check. So if you just do qup_i2c_set_read_mode_v2 and qup_i2c_set_blk_data inside this
 check, will not be enough ?

Regards,
 Sricharan

Thread

RE: [PATCH v2 2/2] i2c: qup: support SMBus block read "Sricharan" <sricharan@codeaurora.org> - 2016-05-18 09:10 +0200
  Re: [PATCH v2 2/2] i2c: qup: support SMBus block read Naveen Kaje <nkaje@codeaurora.org> - 2016-05-19 22:20 +0200
    Re: [PATCH v2 2/2] i2c: qup: support SMBus block read Timur Tabi <timur@codeaurora.org> - 2016-05-19 22:30 +0200
      Re: [PATCH v2 2/2] i2c: qup: support SMBus block read Naveen Kaje <nkaje@codeaurora.org> - 2016-05-19 23:20 +0200
    RE: [PATCH v2 2/2] i2c: qup: support SMBus block read "Sricharan" <sricharan@codeaurora.org> - 2016-05-20 10:40 +0200
      Re: [PATCH v2 2/2] i2c: qup: support SMBus block read "Christ, Austin" <austinwc@codeaurora.org> - 2016-05-23 19:50 +0200

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