linux-kernel - Re: [PATCH v1 2/6] i2c: iproc: handle only slave interrupts which are enabled

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Date:   Fri, 23 Oct 2020 10:18:23 -0700
From:   Ray Jui <ray.jui@...adcom.com>
To:     Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Wolfram Sang <wsa@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lori Hikichi <lori.hikichi@...adcom.com>,
        Dhananjay Phadke <dphadke@...ux.microsoft.com>,
        linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/6] i2c: iproc: handle only slave interrupts which are
 enabled



On 10/11/2020 11:22 AM, Rayagonda Kokatanur wrote:
> Handle only slave interrupts which are enabled.
> 
> The IS_OFFSET register contains the interrupt status bits which will be
> set regardless of the enabling of the corresponding interrupt condition.
> One must therefore look at both IS_OFFSET and IE_OFFSET to determine
> whether an interrupt condition is set and enabled.
> 
> Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode")
> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
> ---
>  drivers/i2c/busses/i2c-bcm-iproc.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> index 834a98caeada..b54f5130d246 100644
> --- a/drivers/i2c/busses/i2c-bcm-iproc.c
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -507,12 +507,17 @@ static void bcm_iproc_i2c_process_m_event(struct bcm_iproc_i2c_dev *iproc_i2c,
>  static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>  {
>  	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> -	u32 status = iproc_i2c_rd_reg(iproc_i2c, IS_OFFSET);
> +	u32 slave_status;
> +	u32 status;
>  	bool ret;
> -	u32 sl_status = status & ISR_MASK_SLAVE;
>  
> -	if (sl_status) {
> -		ret = bcm_iproc_i2c_slave_isr(iproc_i2c, sl_status);
> +	status = iproc_i2c_rd_reg(iproc_i2c, IS_OFFSET);
> +	/* process only slave interrupt which are enabled */
> +	slave_status = status & iproc_i2c_rd_reg(iproc_i2c, IE_OFFSET) &
> +		       ISR_MASK_SLAVE;
> +
> +	if (slave_status) {
> +		ret = bcm_iproc_i2c_slave_isr(iproc_i2c, slave_status);
>  		if (ret)
>  			return IRQ_HANDLED;
>  		else
> 

Acked-by: Ray Jui <ray.jui@...adcom.com>

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