linux-kernel - Re: [PATCH 1/3] clk: at91: fix programmable clk irq handling

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Date:	Tue, 4 Feb 2014 10:04:11 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>,
	Mike Turquette <mturquette@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] clk: at91: fix programmable clk irq handling

On 03/02/2014 12:25, Boris BREZILLON :
> The prog irq is a level irq reflecting the prog clk status. As a result the
> irq line will stay high when the prog clk is ready and the system will
> hang.
> Disable the irq when it is handled to avoid this problem.
> 
> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

> ---
>  drivers/clk/at91/clk-programmable.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c
> index fd792b2..02f62a0 100644
> --- a/drivers/clk/at91/clk-programmable.c
> +++ b/drivers/clk/at91/clk-programmable.c
> @@ -55,6 +55,7 @@ static irqreturn_t clk_programmable_irq_handler(int irq, void *dev_id)
>  	struct clk_programmable *prog = (struct clk_programmable *)dev_id;
>  
>  	wake_up(&prog->wait);
> +	disable_irq_nosync(prog->irq);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -74,8 +75,10 @@ static int clk_programmable_prepare(struct clk_hw *hw)
>  
>  	pmc_write(pmc, AT91_PMC_PCKR(id), tmp);
>  
> -	while (!(pmc_read(pmc, AT91_PMC_SR) & mask))
> +	while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
> +		enable_irq(prog->irq);
>  		wait_event(prog->wait, pmc_read(pmc, AT91_PMC_SR) & mask);
> +	}
>  
>  	return 0;
>  }
> 


-- 
Nicolas Ferre
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