linux-kernel - Re: [PATCH 07/18] spi: qup: Fix transaction done signaling

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Date:   Wed, 14 Jun 2017 12:43:43 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Varadarajan Narayanan <varada@...eaurora.org>, broonie@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH 07/18] spi: qup: Fix transaction done signaling

Hi Varada,

On 6/14/2017 11:22 AM, Varadarajan Narayanan wrote:
> Wait to signal done until we get all of the interrupts we are expecting
> to get for a transaction.  If we don't wait for the input done flag, we
> can be inbetween transactions when the done flag comes in and this can
> mess up the next transaction.
> 
> Signed-off-by: Andy Gross <andy.gross@...aro.org>
> Signed-off-by: Varadarajan Narayanan <varada@...eaurora.org>
> ---
>  drivers/spi/spi-qup.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
> index 2124815..7c22ee4 100644
> --- a/drivers/spi/spi-qup.c
> +++ b/drivers/spi/spi-qup.c
> @@ -465,7 +465,8 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
>  	controller->xfer = xfer;
>  	spin_unlock_irqrestore(&controller->lock, flags);
>  
> -	if (controller->rx_bytes == xfer->len || error)
> +	if ((controller->rx_bytes == xfer->len &&
> +		(opflags & QUP_OP_MAX_INPUT_DONE_FLAG)) ||  error)

 Not sure why we need this additional check, because having read all the
 bytes implies transfer complete (or) why not just check only for
 QUP_OP_MAX_INPUT_DONE_FLAG ?

Regards,
 Sricharan

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