[PATCH 4/4][B/linux-azure-4.15] cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode

[Bartlomiej Zolnierkiewicz]

From: Giovanni Gherdovich <ggherdovich at suse.cz>

BugLink: https://bugs.launchpad.net/bugs/1952234

Users may disable HWP in firmware, in which case intel_pstate wouldn't load
unless the CPU model is explicitly supported.

Add ICELAKE_X to the list of CPUs that can register intel_pstate while not
advertising the HWP capability. Without this change, an ICELAKE_X in no-HWP
mode could only use the acpi_cpufreq frequency scaling driver.

See also commit d8de7a44e11f ("cpufreq: intel_pstate: Add Skylake servers
support").

Signed-off-by: Giovanni Gherdovich <ggherdovich at suse.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
(backported from commit fbdc21e9b038d00d0d56fa4e0f7701d42ae08f00)
Signed-off-by: Bartlomiej Zolnierkiewicz <bartlomiej.zolnierkiewicz at canonical.com>
---
 drivers/cpufreq/intel_pstate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 75012b8444e6..1f2f177f0bd6 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1644,6 +1644,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
 	ICPU(INTEL_FAM6_XEON_PHI_KNM,		knl_funcs),
 	ICPU(INTEL_FAM6_ATOM_GOLDMONT,		bxt_funcs),
 	ICPU(INTEL_FAM6_ATOM_GOLDMONT_PLUS,     bxt_funcs),
+	ICPU(INTEL_FAM6_ICELAKE_X,		core_funcs),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
-- 
2.25.1