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drivers/spi/acpi: Update _S0W return value to D3hot 

In order to support wake from D3cold, most devices require extra
circuitry and possibly out-of-band communications to the host.
Therefore, assume that most SPI peripherals that do have wake
capabilities support wake from D3hot rather than D3cold.

This also allows coreboot to expose a power resource to perform power
sequencing for a SPI peripheral that is intended to retain power in
S3/S0ix.

If support for a device with d3cold wake support is needed, it could be
added in later as an option.

BUG=b:187228954
TEST=compile

Change-Id: I1d739b49c1a43007eb0199fe39b3b7d7375e6577
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56833
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Tim Wawrzynczak 2021-08-05 09:32:37 -06:00
parent 72c0b54efb
commit 04c71deceb
1 changed files with 1 additions and 1 deletions
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2
src/drivers/spi/acpi/acpi.c
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@ -125,7 +125,7 @@ static void spi_acpi_fill_ssdt_generator(const struct device *dev)
/* Wake capabilities */
if (config->wake) {
acpigen_write_name_integer("_S0W", 4);
acpigen_write_name_integer("_S0W", ACPI_DEVICE_SLEEP_D3_HOT);
acpigen_write_PRW(config->wake, 3);
};