linux-kernel - Re: [PATCH v6] ACPI: skip IRQ override on AMD Zen platforms

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Date:   Wed, 28 Sep 2022 08:20:43 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Chuanhong Guo <gch981213@...il.com>, linux-acpi@...r.kernel.org
Cc:     Tighe Donnelly <tighe.donnelly@...tonmail.com>,
        Mario Limonciello <mario.limonciello@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6] ACPI: skip IRQ override on AMD Zen platforms

Hi,

On 12. 07. 22, 4:00, Chuanhong Guo wrote:
> IRQ override isn't needed on modern AMD Zen systems.
> There's an active low keyboard IRQ on AMD Ryzen 6000 and it will stay
> this way on newer platforms. This IRQ override breaks keyboards for
> almost all Ryzen 6000 laptops currently on the market.
> 
> Skip this IRQ override for all AMD Zen platforms because this IRQ
> override is supposed to be a workaround for buggy ACPI DSDT and we can't
> have a long list of all future AMD CPUs/Laptops in the kernel code.
> If a device with buggy ACPI DSDT shows up, a separated list containing
> just them should be created.

This breaks pads on IdeaPad 5 Flex:
https://bugzilla.suse.com/show_bug.cgi?id=1203794

 > [    1.058135] hid-generic 0020:1022:0001.0001: hidraw0: SENSOR HUB 
HID v0.00 Device [hid-amdsfh 1022:0001] on pcie_mp2_amd
 > [    2.038937] i2c_designware AMDI0010:00: controller timed out
 > [    2.146627] i2c_designware AMDI0010:03: controller timed out
 > [    6.166859] i2c_hid_acpi i2c-MSFT0001:00: failed to reset device: -61
 > [    8.279604] i2c_designware AMDI0010:03: controller timed out
 > [   12.310897] i2c_hid_acpi i2c-MSFT0001:00: failed to reset device: -61
 > [   14.429372] i2c_designware AMDI0010:03: controller timed out
 > [   18.462629] i2c_hid_acpi i2c-MSFT0001:00: failed to reset device: -61
 > [   20.579183] i2c_designware AMDI0010:03: controller timed out
 > [   24.598703] i2c_hid_acpi i2c-MSFT0001:00: failed to reset device: -61
 > [   25.629071] i2c_hid_acpi i2c-MSFT0001:00: can't add hid device: -61
 > [   25.629430] i2c_hid_acpi: probe of i2c-MSFT0001:00 failed with 
error -61

The diff of good and bad dmesgs:
-ACPI: IRQ 10 override to edge, high
-ACPI: IRQ 6 override to edge, high

The diff of /proc/interrupts:
      6: ...  IR-IO-APIC    [-6-fasteoi-]    {+6-edge+}      AMDI0010:03
     10: ...  IR-IO-APIC   [-10-fasteoi-]   {+10-edge+}      AMDI0010:00

And:
   i2c_designware: /devices/platform/AMDI0010:00
   i2c_designware: /devices/platform/AMDI0010:03


So the if needs to be fine-tuned, apparently. Maybe introduce some list 
as suggested in the commit log. Based on the below?

DMI says:
   System Info: #14
     Manufacturer: "LENOVO"
     Product: "82RA"
     Version: "IdeaPad Flex 5 16ALC7"
     Serial: "PW02359K"
     UUID: 6b2d54d9-cd80-11ec-83eb-e00af665fbac
     Wake-up: 0x06 (Power Switch)
   Board Info: #15
     Manufacturer: "LENOVO"
     Product: "LNVNB161216"
     Version: "SDK0T76463 WIN"
     Serial: "PW02359K"
     Asset Tag: "No Asset Tag"
     Type: 0x0a (Motherboard)
     Features: 0x09
       Hosting Board
       Replaceable
     Location: "Chassis Location Unknown"
   Chassis Info: #16
     Manufacturer: "LENOVO"
     Version: "IdeaPad Flex 5 16ALC7"
     Serial: "PW02359K"
     Asset Tag: "No Asset Tag"
     Type: 0x1f (Other)
     Bootup State: 0x03 (Safe)
     Power Supply State: 0x03 (Safe)
     Thermal State: 0x01 (Other)
     Security Status: 0x01 (Other)

> Suggested-by: Mario Limonciello <mario.limonciello@....com>
> Signed-off-by: Chuanhong Guo <gch981213@...il.com>
> ---
> Change sice v5: reworked
> 
>   drivers/acpi/resource.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index c2d494784425..510cdec375c4 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -416,6 +416,16 @@ static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
>   {
>   	int i;
>   
> +#ifdef CONFIG_X86
> +	/*
> +	 * IRQ override isn't needed on modern AMD Zen systems and
> +	 * this override breaks active low IRQs on AMD Ryzen 6000 and
> +	 * newer systems. Skip it.
> +	 */
> +	if (boot_cpu_has(X86_FEATURE_ZEN))
> +		return false;
> +#endif
> +
>   	for (i = 0; i < ARRAY_SIZE(skip_override_table); i++) {
>   		const struct irq_override_cmp *entry = &skip_override_table[i];
>   

thanks,
-- 
js