Re: [PATCH v17 5/6] spi: pxa2xx-pci: restore LPSS private register state across S3 resume

[Mika Westerberg]

Hi,

On Thu, Oct 01, 2026 at 12:06:28AM +0800, Shih-Yuan Lee wrote:
> On platforms where Intel LPSS SPI is enumerated as a bare PCI device
> (such as the Apple MacBook8,1 on Lynxpoint-LP), the LPSS power island
> loses power during system sleep and powers up with the controller held
> in reset. Because the device lacks ACPI companion objects or MFD
> binding, neither drivers/acpi/x86/lpss.c nor drivers/mfd/intel-lpss.c
> restore the private register context across S3 resume.

Hmm, how is that possible? The LPSS is a single PCI device that only the
the LPSS MFD driver binds to. I don't think it is any different in Apple
platforms than any other regular PC platforms in that sense. What does
lspci -vv show on this system?