On Wed, Jul 6, 2016 at 6:03 PM, Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> wrote: > On Fri, Jul 01, 2016 at 11:19:06PM +0300, Octavian Purdila wrote: >> If the ACPI tables changes as a result of a dinamically loaded table and >> a bus rescan is required the enumeration/visited flag are not >> consistent. >> >> I2C/SPI are not directly enumerated in acpi_bus_attach(), however the >> visited flag is set. This makes it impossible to check if an ACPI device >> has already been enumerated by the I2C and SPI subsystems. To fix this >> issue we only set the visited flags if the device is not I2C or SPI. >> >> With this change we also need to remove setting visited to false from >> acpi_bus_attach(), otherwise if we rescan already enumerated I2C/SPI >> devices we try to re-enumerate them. >> >> Note that I2C/SPI devices can be enumerated either via a scan handler >> (when using PRP0001) or via regular device_attach(). In either case >> the flow goes through acpi_default_enumeration() which makes it the >> ideal place to mark the ACPI device as enumerated. > > Hmm, this somehow fails to enumerate PRP0001 devices. > > I'm adding following SSDT to my initrd and the resulting device is never > enumerated on SPI bus (it exists in /sys/bus/acpi/devices). If I use > normal ACPI IDs (non-PRP0001) then it works fine. > I specifically tested with PRP0001 via initrd with I2C, I am not sure why it does not work on SPI. I'll give it a try tomorrow when I have access to my setup. -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
