linux-kernel - Re: [PATCH V1 06/15] spmi: pmic-arb: fix missing interrupts

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Date:   Tue, 30 May 2017 19:00:19 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Kiran Gunda <kgunda@...eaurora.org>
Cc:     Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        David Collins <collinsd@...eaurora.org>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        adharmap@...cinc.com, aghayal@....qualcomm.com
Subject: Re: [PATCH V1 06/15] spmi: pmic-arb: fix missing interrupts

On 05/30, Kiran Gunda wrote:
> From: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
> 
> irq_enable is called when the device resumes. Note that the
> irq_enable is called regardless of whether the interrupt was
> marked enabled/disabled in the descriptor or whether it was
> masked/unmasked at the controller while resuming.
> 
> The current driver unconditionally clears the interrupt in its
> irq_enable callback. This is dangerous as any interrupts that
> happen right before the resume could be missed.
> Remove the irq_enable callback and use mask/unmask instead.
> 
> Also remove struct pmic_arb_irq_spec as it serves no real purpose.
> It is used only in the translate function and the code is much
> cleaner without it.

Also a separate patch for that part....

> 
> Signed-off-by: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
> Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
> ---
>  drivers/spmi/spmi-pmic-arb.c | 29 +++--------------------------
>  1 file changed, 3 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> index 0a5728c..bc03737 100644
> --- a/drivers/spmi/spmi-pmic-arb.c
> +++ b/drivers/spmi/spmi-pmic-arb.c
> @@ -588,17 +588,6 @@ static void qpnpint_irq_unmask(struct irq_data *d)
>  	qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
>  }
>  
> -static void qpnpint_irq_enable(struct irq_data *d)
> -{
> -	u8 irq  = d->hwirq >> 8;
> -	u8 data;
> -
> -	qpnpint_irq_unmask(d);
> -
> -	data = BIT(irq);
> -	qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
> -}
> -
>  static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type)
>  {
>  	struct spmi_pmic_arb_qpnpint_type type;
> @@ -647,7 +636,6 @@ static int qpnpint_get_irqchip_state(struct irq_data *d,
>  
>  static struct irq_chip pmic_arb_irqchip = {
>  	.name		= "pmic_arb",
> -	.irq_enable	= qpnpint_irq_enable,
>  	.irq_ack	= qpnpint_irq_ack,
>  	.irq_mask	= qpnpint_irq_mask,
>  	.irq_unmask	= qpnpint_irq_unmask,

This looks ok.

-- 
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