[PATCH v2 1/7] acpi/cppc: Add macro for CPPC register BUFFER only check

From: "Natarajan, Janakarajan" <Janakarajan.Natarajan@amd.com>
To: "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"devel@acpica.org" <devel@acpica.org>
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Robert Moore <robert.moore@intel.com>,
	Erik Schmauss <erik.schmauss@intel.com>,
	"Ghannam, Yazen" <Yazen.Ghannam@amd.com>,
	"Natarajan, Janakarajan" <Janakarajan.Natarajan@amd.com>
Subject: [PATCH v2 1/7] acpi/cppc: Add macro for CPPC register BUFFER only check
Date: Thu, 4 Apr 2019 21:25:47 +0000	[thread overview]
Message-ID: <4eae43aeb96e379bbdd9cd2a040fe53c147bd412.1554410643.git.Janakarajan.Natarajan@amd.com> (raw)
In-Reply-To: <cover.1554410643.git.Janakarajan.Natarajan@amd.com>

CPC_SUP_BUFFER_ONLY ensures that an expected BUFFER only register has a
register type of ACPI_TYPE_BUFFER and is not NULL.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
---
 drivers/acpi/cppc_acpi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index d4244e7d0e38..56a09e057c4f 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -115,6 +115,14 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr);
 #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ?		\
 				!!(cpc)->cpc_entry.int_value :		\
 				!IS_NULL_REG(&(cpc)->cpc_entry.reg))
+
+/*
+ * Evaluates to True if an optional cpc field is supported and is
+ * BUFFER only
+ */
+#define CPC_SUP_BUFFER_ONLY(cpc) ((cpc)->type == ACPI_TYPE_BUFFER &&	\
+				  !IS_NULL_REG(&(cpc)->cpc_entry.reg))
+
 /*
  * Arbitrary Retries in case the remote processor is slow to respond
  * to PCC commands. Keeping it high enough to cover emulators where
-- 
2.17.1

