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ACPI: CPPC: Only probe for _CPC if CPPC v2 is acked 

Previously the kernel used to ignore whether the firmware masked CPPC
or CPPCv2 and would just pretend that it worked.

When support for the USB4 bit in _OSC was introduced from commit
9e1f561afb ("ACPI: Execute platform _OSC also with query bit clear")
the kernel began to look at the return when the query bit was clear.

This caused regressions that were misdiagnosed and attempted to be solved
as part of commit 2ca8e62852 ("Revert "ACPI: Pass the same capabilities
to the _OSC regardless of the query flag""). This caused a different
regression where non-Intel systems weren't able to negotiate _OSC
properly.

This was reverted in commit 2ca8e62852 ("Revert "ACPI: Pass the same
capabilities to the _OSC regardless of the query flag"") and attempted to
be fixed by commit c42fa24b44 ("ACPI: bus: Avoid using CPPC if not
supported by firmware") but the regression still returned.

These systems with the regression only load support for CPPC from an SSDT
dynamically when _OSC reports CPPC v2.  Avoid the problem by not letting
CPPC satisfy the requirement in `acpi_cppc_processor_probe`.

Reported-by: CUI Hao <cuihao.leo@gmail.com>
Reported-by: maxim.novozhilov@gmail.com
Reported-by: lethe.tree@protonmail.com
Reported-by: garystephenwright@gmail.com
Reported-by: galaxyking0419@gmail.com
Fixes: c42fa24b44 ("ACPI: bus: Avoid using CPPC if not supported by firmware")
Fixes: 2ca8e62852 ("Revert "ACPI Pass the same capabilities to the _OSC regardless of the query flag"")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=213023
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2075387
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: CUI Hao <cuihao.leo@gmail.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello 2022-07-05 13:29:14 -05:00 committed by Rafael J. Wysocki
parent 88084a3df1
commit 7feec7430e
3 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/acpi/bus.c
View File

@ -298,7 +298,7 @@ EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
bool osc_sb_native_usb4_support_confirmed;
EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
bool osc_sb_cppc_not_supported;
bool osc_sb_cppc2_support_acked;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_negotiate_platform_control(void)
@ -358,11 +358,6 @@ static void acpi_bus_osc_negotiate_platform_control(void)
return;
}
#ifdef CONFIG_ACPI_CPPC_LIB
osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
(OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
#endif
/*
* Now run _OSC again with query flag clear and with the caps
* supported by both the OS and the platform.
@ -376,6 +371,10 @@ static void acpi_bus_osc_negotiate_platform_control(void)
capbuf_ret = context.ret.pointer;
if (context.ret.length > OSC_SUPPORT_DWORD) {
#ifdef CONFIG_ACPI_CPPC_LIB
osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
#endif
osc_sb_apei_support_acked =
capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
osc_pc_lpi_support_confirmed =

4
drivers/acpi/cppc_acpi.c
View File

@ -684,8 +684,10 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
acpi_status status;
int ret = -ENODATA;
if (osc_sb_cppc_not_supported)
if (!osc_sb_cppc2_support_acked) {
pr_debug("CPPC v2 _OSC not acked\n");
return -ENODEV;
}
/* Parse the ACPI _CPC table for this CPU. */
status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,

2
include/linux/acpi.h
View File

@ -584,7 +584,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
extern bool osc_sb_apei_support_acked;
extern bool osc_pc_lpi_support_confirmed;
extern bool osc_sb_native_usb4_support_confirmed;
extern bool osc_sb_cppc_not_supported;
extern bool osc_sb_cppc2_support_acked;
extern bool osc_cpc_flexible_adr_space_confirmed;
/* USB4 Capabilities */