On 5/20/2016 2:31 AM, Sricharan wrote:
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
In testing, removing the call to qup_i2c_issue_xfer_v2() within the
conditional statement for SMBus length causes failures. That transfer
request is needed to read that block of data.
Thanks,
Austin
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