[v2] pinctrl: intel: Clear interrupt status in mask/unmask callback

Commit a939bb57cd47 ("pinctrl: intel: implement gpio_irq_enable") was
added because clearing interrupt status bit is required to avoid
unexpected behavior.

Turns out the unmask callback also needs the fix, which can solve weird
IRQ triggering issues on I2C touchpad ELAN1200.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v2:
- Clear interrupt status for both mask/umask cases.
- Reduce calculation under irq spinlock.

 drivers/pinctrl/intel/pinctrl-intel.c | 37 +++++----------------------
 1 file changed, 6 insertions(+), 31 deletions(-)

On Tue, Apr 30, 2019 at 04:37:53PM +0800, Kai-Heng Feng wrote:
> Commit a939bb57cd47 ("pinctrl: intel: implement gpio_irq_enable") was
> added because clearing interrupt status bit is required to avoid
> unexpected behavior.
> 
> Turns out the unmask callback also needs the fix, which can solve weird
> IRQ triggering issues on I2C touchpad ELAN1200.

Pushed to my review and testing queue, thanks!

> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> v2:
> - Clear interrupt status for both mask/umask cases.
> - Reduce calculation under irq spinlock.
> 
>  drivers/pinctrl/intel/pinctrl-intel.c | 37 +++++----------------------
>  1 file changed, 6 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
> index 3b1818184207..717148d2818c 100644
> --- a/drivers/pinctrl/intel/pinctrl-intel.c
> +++ b/drivers/pinctrl/intel/pinctrl-intel.c
> @@ -913,35 +913,6 @@ static void intel_gpio_irq_ack(struct irq_data *d)
>  	}
>  }
>  
> -static void intel_gpio_irq_enable(struct irq_data *d)
> -{
> -	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> -	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
> -	const struct intel_community *community;
> -	const struct intel_padgroup *padgrp;
> -	int pin;
> -
> -	pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
> -	if (pin >= 0) {
> -		unsigned int gpp, gpp_offset, is_offset;
> -		unsigned long flags;
> -		u32 value;
> -
> -		gpp = padgrp->reg_num;
> -		gpp_offset = padgroup_offset(padgrp, pin);
> -		is_offset = community->is_offset + gpp * 4;
> -
> -		raw_spin_lock_irqsave(&pctrl->lock, flags);
> -		/* Clear interrupt status first to avoid unexpected interrupt */
> -		writel(BIT(gpp_offset), community->regs + is_offset);
> -
> -		value = readl(community->regs + community->ie_offset + gpp * 4);
> -		value |= BIT(gpp_offset);
> -		writel(value, community->regs + community->ie_offset + gpp * 4);
> -		raw_spin_unlock_irqrestore(&pctrl->lock, flags);
> -	}
> -}
> -
>  static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
>  {
>  	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> @@ -954,15 +925,20 @@ static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
>  	if (pin >= 0) {
>  		unsigned int gpp, gpp_offset;
>  		unsigned long flags;
> -		void __iomem *reg;
> +		void __iomem *reg, *is;
>  		u32 value;
>  
>  		gpp = padgrp->reg_num;
>  		gpp_offset = padgroup_offset(padgrp, pin);
>  
>  		reg = community->regs + community->ie_offset + gpp * 4;
> +		is = community->regs + community->is_offset + gpp * 4;
>  
>  		raw_spin_lock_irqsave(&pctrl->lock, flags);
> +
> +		/* Clear interrupt status first to avoid unexpected interrupt */
> +		writel(BIT(gpp_offset), is);
> +
>  		value = readl(reg);
>  		if (mask)
>  			value &= ~BIT(gpp_offset);
> @@ -1106,7 +1082,6 @@ static irqreturn_t intel_gpio_irq(int irq, void *data)
>  
>  static struct irq_chip intel_gpio_irqchip = {
>  	.name = "intel-gpio",
> -	.irq_enable = intel_gpio_irq_enable,
>  	.irq_ack = intel_gpio_irq_ack,
>  	.irq_mask = intel_gpio_irq_mask,
>  	.irq_unmask = intel_gpio_irq_unmask,
> -- 
> 2.17.1
>

On Wed, May 08, 2019 at 07:58:26AM +0200, hotwater438@tutanota.com wrote:
> Hello guys, any updates on suspend issue?

Please, do not top-post.

The patch you mentioned is in a queue to be submitted after merge window closes.
Be patient.