linux-kernel - Re: [RFC] pinctrl/amd: Clear interrupt enable bits on probe

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Date:   Tue, 19 Feb 2019 14:23:03 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Leonard Crestez <cdleonard@...il.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nehal Shah <Nehal-bakulchandra.Shah@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc:     Daniel Drake <drake@...lessm.com>,
        Nitesh Kumar Agrawal <Nitesh-kumar.Agrawal@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] pinctrl/amd: Clear interrupt enable bits on probe

Hi,

On 19-02-19 11:59, Leonard Crestez wrote:
> My Acer Nitro 5 AN515-42 laptop with a Ryzen 2700U hangs on boot because
> of spurious interrupts from pinctrl-amd.
> 
> This seems to happen because the touchpad interrupt is enabled on boot
> in "level" mode and there is no way to clear it until a touchpad driver
> probes.
> 
> Fix by disabling all gpio interrupts at probe time until they are
> explicitly requested by drivers.
> 
> Signed-off-by: Leonard Crestez <cdleonard@...il.com>
> 
> ---
> 
> It's strange that nobody else has run into this problem, AMD hardware is
> relatively common. Maybe firmware generally disables GPIO interrupts
> itself?

Others have run into the problem, but no-one so far has had both time and
access to the hardware to actually get to the bottom of this, see:
https://bugzilla.kernel.org/show_bug.cgi?id=201817#c4

Your patch looks like it is exactly what is needed to fix this,
thank you very much for the patch!

I will attach a copy of your patch to that bug and ask people who are
having similar problems to test it.

Regards,

Hans




>
> This patch fixes boot but this same laptop has other issues:
> 
>   * Suspend is broken
>   * Ethernet is broken (only sometimes)
>   * The CPU freq gets stuck at 400 Mhz (sometimes)
> 
> Those issues happen on maybe 80% of boots without a clear pattern. It
> seems that inserting/removing the ethernet jack during boot helps
> cpufreq? It's possible that these problems are also caused by pin
> misconfiguration so this fix might be incomplete.
> 
> When the cpufreq issue happens `rdmsr 0xc0010061 -a` shows 0x22 for all
> cpus; maybe this is some broken thermal throttling?
> 
> Also, perhaps amd_gpio_irq_disable_all should enumerate in a nicer less
> verbose way?
> 
> Previously: https://lore.kernel.org/patchwork/patch/1028047/
> 
> diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
> index 2a7d638978d8..3cb7ea46f32c 100644
> --- a/drivers/pinctrl/pinctrl-amd.c
> +++ b/drivers/pinctrl/pinctrl-amd.c
> @@ -592,10 +592,53 @@ static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
>   	raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
>   
>   	return ret;
>   }
>   
> +static void amd_gpio_irq_disable_all(struct amd_gpio *gpio_dev)
> +{
> +	unsigned int bank, i, pin_num;
> +	u32 regval;
> +
> +	for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
> +		switch (bank) {
> +		case 0:
> +			i = 0;
> +			pin_num = AMD_GPIO_PINS_BANK0;
> +			break;
> +		case 1:
> +			i = 64;
> +			pin_num = AMD_GPIO_PINS_BANK1 + i;
> +			break;
> +		case 2:
> +			i = 128;
> +			pin_num = AMD_GPIO_PINS_BANK2 + i;
> +			break;
> +		case 3:
> +			i = 192;
> +			pin_num = AMD_GPIO_PINS_BANK3 + i;
> +			break;
> +		default:
> +			/* Illegal bank number, ignore */
> +			continue;
> +		}
> +
> +		for (; i < pin_num; i++) {
> +			unsigned long flags;
> +			raw_spin_lock_irqsave(&gpio_dev->lock, flags);
> +			regval = readl(gpio_dev->base + i * 4);
> +			if (regval & BIT(INTERRUPT_ENABLE_OFF)) {
> +				dev_info(&gpio_dev->pdev->dev,
> +						"Pin %d interrupt enabled on boot: disable\n", i);
> +				regval &= ~BIT(INTERRUPT_ENABLE_OFF);
> +				writel(regval, gpio_dev->base + i * 4);
> +			}
> +			raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
> +		}
> +	}
> +}
> +
>   static int amd_get_groups_count(struct pinctrl_dev *pctldev)
>   {
>   	struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
>   
>   	return gpio_dev->ngroups;
> @@ -910,10 +953,12 @@ static int amd_gpio_probe(struct platform_device *pdev)
>   
>   	ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
>   	if (ret)
>   		return ret;
>   
> +	amd_gpio_irq_disable_all(gpio_dev);
> +
>   	ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
>   				0, 0, gpio_dev->gc.ngpio);
>   	if (ret) {
>   		dev_err(&pdev->dev, "Failed to add pin range\n");
>   		goto out2;
>