linux-kernel - [PATCH 05/11] acpi: cppc: Allow build with ACPI_CPU_FREQ

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Date:   Thu, 18 Aug 2016 15:36:46 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
        rjw@...ysocki.net, peterz@...radead.org
Cc:     x86@...nel.org, bp@...e.de, sudeep.holla@....com,
        ak@...ux.intel.com, linux-acpi@...r.kernel.org,
        linux-pm@...r.kernel.org, alexey.klimov@....com,
        viresh.kumar@...aro.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, lenb@...nel.org,
        tim.c.chen@...ux.intel.com, srinivas.pandruvada@...ux.intel.com,
        paul.gortmaker@...driver.com, jpoimboe@...hat.com,
        mcgrof@...nel.org, jgross@...e.com, robert.moore@...el.com,
        dvyukov@...gle.com, jeyu@...hat.com
Subject: [PATCH 05/11] acpi: cppc: Allow build with ACPI_CPU_FREQ_PSS config

Some newer x86 platforms have support for both _CPC and _PSS object. So
kernel config can have both ACPI_CPU_FREQ_PSS and ACPI_CPPC_LIB. So remove
restriction for ACPI_CPPC_LIB to build only when ACPI_CPU_FREQ_PSS is not
defined.
Also for legacy systems with only _PSS, we shouldn't bail out if
acpi_cppc_processor_probe() fails, if ACPI_CPU_FREQ_PSS is also defined.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 drivers/acpi/Kconfig            | 1 -
 drivers/acpi/processor_driver.c | 5 ++++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 445ce28..c6bb6aa 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -227,7 +227,6 @@ config ACPI_MCFG
 config ACPI_CPPC_LIB
 	bool
 	depends on ACPI_PROCESSOR
-	depends on !ACPI_CPU_FREQ_PSS
 	select MAILBOX
 	select PCC
 	help
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 0553aee..0e0b629 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -245,8 +245,11 @@ static int __acpi_processor_start(struct acpi_device *device)
 		return 0;
 
 	result = acpi_cppc_processor_probe(pr);
-	if (result)
+	if (result) {
+#ifndef CONFIG_ACPI_CPU_FREQ_PSS
 		return -ENODEV;
+#endif
+	}
 
 	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
 		acpi_processor_power_init(pr);
-- 
2.7.4