Commit 392ed6a7 authored by Aubrey Li's avatar Aubrey Li Committed by Rafael J. Wysocki

ACPI: Do not singal PRM support if not enabled

If the OS confirms PRM (Platform Runtime Mechanism) support through
the \_SB._OSC PRM bit, the BIOS may start relying on the presence of
PRM support in the OS, so prevent the PRM bit from being set in the
\_SB._OSC capabilities bitmask when PRM support is not built in so
as to avoid confusing the BIOS in that case.

Fixes: 60faa8f1 ("ACPI: Add \_SB._OSC bit for PRM")
Signed-off-by: default avatarAubrey Li <aubrey.li@linux.intel.com>
[ rjw: Rewrite subject and changelog, replace #ifdef with if (IS_ENABLED()) ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent bd7a94c0
......@@ -305,7 +305,8 @@ static void acpi_bus_osc_negotiate_platform_control(void)
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
if (IS_ENABLED(CONFIG_ACPI_PRMT))
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
#ifdef CONFIG_ARM64
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
......
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