linux-kernel - [PATCH 2/2] ACPI: let BIOS fall back to legacy handling if PRM disabled

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Message-Id: <1625209430-19934-2-git-send-email-aubrey.li@intel.com>
Date:   Fri,  2 Jul 2021 15:03:50 +0800
From:   Aubrey Li <aubrey.li@...el.com>
To:     rjw@...ysocki.net, lenb@...nel.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Aubrey Li <aubrey.li@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>
Subject: [PATCH 2/2] ACPI: let BIOS fall back to legacy handling if PRM disabled

Based on _OSC PRM bit, BIOS can choose switch from legacy handling
to using PRM. So if CONFIG_ACPI_PRMT is disabled, this bit should
not be set to let BIOS fall back to the legacy handling (such as SMI).

Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Aubrey Li <aubrey.li@...ux.intel.com>
---
 drivers/acpi/bus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 60fb6a84..30a3d4a 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -303,7 +303,9 @@ 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;
+#ifdef CONFIG_ACPI_PRMT
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
+#endif
 
 #ifdef CONFIG_ARM64
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
-- 
2.7.4