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SubjectRe: [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@intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.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

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