linux-kernel - Re: [PATCH] power: twl4030_charger: clear IRQs after handling them

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Date:	Wed, 16 Apr 2014 09:35:27 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Felipe Balbi <balbi@...com>
Cc:	dbaryshkov@...il.com, dwmw2@...radead.org,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH] power: twl4030_charger: clear IRQs after handling them

* Felipe Balbi <balbi@...com> [140416 08:18]:
> TRM says we *must* write 1 to each bit we're handling
> in order to clear the IRQ status and bring IRQ line
> low. This patch implements that.
> 
> Signed-off-by: Felipe Balbi <balbi@...com>
> ---
> 
> Russell, I don't have HW to test, but this should
> solve the problem you saw when not using battery
> with Zoom board. Let me know if it doesn't.

BTW, looks like we're enabling BCI automatically in twl4030.dtsi
while the legacy booting does not have TWL_COMMON_PDATA_BCI
enabled for LDP. Anyways, for LDP BCI should be enabled for
sure, that's the only way to power at least the earlier LDP
revisions.

>  drivers/power/twl4030_charger.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> index f141088..b090842 100644
> --- a/drivers/power/twl4030_charger.c
> +++ b/drivers/power/twl4030_charger.c
> @@ -301,12 +301,24 @@ static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
>  	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
>  			      TWL4030_INTERRUPTS_BCIISR1A);
>  	if (ret < 0)
> -		return IRQ_HANDLED;
> +		return IRQ_NONE;
> +
> +	/* clear IRQs early */
> +	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
> +			TWL4030_INTERRUPTS_BCIISR1A);
> +	if (ret < 0)
> +		return IRQ_NONE;
>  
>  	ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
>  			      TWL4030_INTERRUPTS_BCIISR2A);
>  	if (ret < 0)
> -		return IRQ_HANDLED;
> +		return IRQ_NONE;
> +
> +	/* clear IRQs early */
> +	ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
> +			      TWL4030_INTERRUPTS_BCIISR2A);
> +	if (ret < 0)
> +		return IRQ_NONE;
>  
>  	dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
>  
> -- 
> 1.9.1.286.g5172cb3
> 
> --
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