linux-kernel - Re: [PATCH] usb: typec: intel_pmc_mux: Add new ACPI ID for Meteor Lake IOM device

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Message-ID: <YujndMdpS+4L0AiL@kuha.fi.intel.com>
Date:   Tue, 2 Aug 2022 11:59:32 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Utkarsh Patel <utkarsh.h.patel@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        rajmohan.mani@...el.com
Subject: Re: [PATCH] usb: typec: intel_pmc_mux: Add new ACPI ID for Meteor
 Lake IOM device

Hi Utkarsh,

On Thu, Jul 28, 2022 at 05:30:33PM -0700, Utkarsh Patel wrote:
> Intel Meteor Lake IOM uses 64bit IOM BASE address than previous Intel
> Generations which use 32bit.
> 
> Added code to support 64bit IOM BASE address change with necessary ACPI
> resource extraction support.
> 
> Signed-off-by: Utkarsh Patel <utkarsh.h.patel@...el.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  drivers/usb/typec/mux/intel_pmc_mux.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
> index 47b733f78fb0..a8e273fe204a 100644
> --- a/drivers/usb/typec/mux/intel_pmc_mux.c
> +++ b/drivers/usb/typec/mux/intel_pmc_mux.c
> @@ -571,9 +571,11 @@ static int pmc_usb_register_port(struct pmc_usb *pmc, int index,
>  
>  static int is_memory(struct acpi_resource *res, void *data)
>  {
> -	struct resource r;
> +	struct resource_win win = {};
> +	struct resource *r = &win.res;
>  
> -	return !acpi_dev_resource_memory(res, &r);
> +	return !(acpi_dev_resource_memory(res, r) ||
> +		 acpi_dev_resource_address_space(res, &win));
>  }

I realised that now that is_memory() function is basically just a copy
of the is_memory() function that's in drivers/acpi/resources.c, so I
think we need to handle this a bit differently. There are a few places
in kernel that have that same check.

One way would be to just export the is_memory() function that's in
drivers/acpi/resources.c, but since we have already a wrapper function
acpi_dev_get_dma_resources() for DMA resouces, I think we could have a
similar wrapper for common memory resources.

I'll prepare a patch(s) where I'll propose a new wrapper function
acpi_dev_get_memory_resources() that will take care of the is_memory()
check, and then convert the users (including this driver). After that,
this patch only needs to add the ID.


thanks,


>  /* IOM ACPI IDs and IOM_PORT_STATUS_OFFSET */
> @@ -583,6 +585,9 @@ static const struct acpi_device_id iom_acpi_ids[] = {
>  
>  	/* AlderLake */
>  	{ "INTC1079", 0x160, },
> +
> +	/* Meteor Lake */
> +	{ "INTC107A", 0x160, },
>  	{}
>  };
>  
> -- 
> 2.25.1

-- 
heikki