linux-kernel - Re: [PATCH] ACPI / scan: Don't create platform device for INT3515 ACPI nodes

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Date:   Mon, 4 Jan 2021 12:59:39 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Moody Salem <moody@...swap.org>, stable@...r.kernel.org
Subject: Re: [PATCH] ACPI / scan: Don't create platform device for INT3515
 ACPI nodes

Hi,

On 12/23/20 3:36 PM, Heikki Krogerus wrote:
> There are several reports about the tps6598x causing
> interrupt flood on boards with the INT3515 ACPI node, which
> then causes instability. There appears to be several
> problems with the interrupt. One problem is that the
> I2CSerialBus resources do not always map to the Interrupt
> resource with the same index, but that is not the only
> problem. We have not been able to come up with a solution
> for all the issues, and because of that disabling the device
> for now.
> 
> The PD controller on these platforms is autonomous, and the
> purpose for the driver is primarily to supply status to the
> userspace, so this will not affect any functionality.
> 
> Reported-by: Moody Salem <moody@...swap.org>
> Fixes: a3dd034a1707 ("ACPI / scan: Create platform device for INT3515 ACPI nodes")
> Cc: stable@...r.kernel.org
> Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1883511
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans




> ---
>  drivers/platform/x86/i2c-multi-instantiate.c | 31 +++++++++++++++-----
>  1 file changed, 23 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/platform/x86/i2c-multi-instantiate.c
> index 6acc8457866e1..e1df665d3ad31 100644
> --- a/drivers/platform/x86/i2c-multi-instantiate.c
> +++ b/drivers/platform/x86/i2c-multi-instantiate.c
> @@ -166,13 +166,29 @@ static const struct i2c_inst_data bsg2150_data[]  = {
>  	{}
>  };
>  
> -static const struct i2c_inst_data int3515_data[]  = {
> -	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
> -	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
> -	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
> -	{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
> -	{}
> -};
> +/*
> + * Device with _HID INT3515 (TI PD controllers) has some unresolved interrupt
> + * issues. The most common problem seen is interrupt flood.
> + *
> + * There are at least two known causes. Firstly, on some boards, the
> + * I2CSerialBus resource index does not match the Interrupt resource, i.e. they
> + * are not one-to-one mapped like in the array below. Secondly, on some boards
> + * the irq line from the PD controller is not actually connected at all. But the
> + * interrupt flood is also seen on some boards where those are not a problem, so
> + * there are some other problems as well.
> + *
> + * Because of the issues with the interrupt, the device is disabled for now. If
> + * you wish to debug the issues, uncomment the below, and add an entry for the
> + * INT3515 device to the i2c_multi_instance__ids table.
> + *
> + * static const struct i2c_inst_data int3515_data[]  = {
> + *	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
> + *	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
> + *	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
> + *	{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
> + *	{ }
> + * };
> + */
>  
>  /*
>   * Note new device-ids must also be added to i2c_multi_instantiate_ids in
> @@ -181,7 +197,6 @@ static const struct i2c_inst_data int3515_data[]  = {
>  static const struct acpi_device_id i2c_multi_inst_acpi_ids[] = {
>  	{ "BSG1160", (unsigned long)bsg1160_data },
>  	{ "BSG2150", (unsigned long)bsg2150_data },
> -	{ "INT3515", (unsigned long)int3515_data },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, i2c_multi_inst_acpi_ids);
>