linux-kernel - Re: [PATCH 06/12] i2c: qup: proper error handling for i2c error in BAM mode

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Message-ID: <20180227225856.GG20901@hector.attlocal.net>
Date:   Tue, 27 Feb 2018 16:58:56 -0600
From:   Andy Gross <andy.gross@...aro.org>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        David Brown <david.brown@...aro.org>,
        Sricharan R <sricharan@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/12] i2c: qup: proper error handling for i2c error in
 BAM mode

On Sat, Feb 03, 2018 at 01:28:11PM +0530, Abhishek Sahu wrote:

<snip>

> @@ -841,20 +856,12 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
>  			goto desc_err;
>  		}
>  
> -		if (rx_buf)
> -			writel(QUP_BAM_INPUT_EOT,
> -			       qup->base + QUP_OUT_FIFO_BASE);
> -
> -		writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE);
> -
>  		qup_i2c_flush(qup);
>  
>  		/* wait for remaining interrupts to occur */
>  		if (!wait_for_completion_timeout(&qup->xfer, HZ))
>  			dev_err(qup->dev, "flush timed out\n");
>  
> -		qup_i2c_rel_dma(qup);
> -

So this really only works due to the previous patch that adds the flush/eot tags
to all of the read messages.  If the answer to the previous question is that
only the last read message gets the eot/flush, then this code needs to remain in
place.  Otherwise, it's fine.


Andy