[PATCH v2 04/22] clk: qcom: smd-rpm: Export clock scaling availability

[Konrad Dybcio <konrad.dybcio@linaro.org>]

Before we issue a call to RPM through clk_smd_rpm_enable_scaling() the
clock rate requests will not be commited in hardware. This poses a
race threat since we're accessing the bus clocks directly from within
the interconnect framework.

Add a marker to indicate that we're good to go with sending new requests
and export it so that it can be referenced from icc.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/clk/qcom/clk-smd-rpm.c   | 9 +++++++++
 include/linux/soc/qcom/smd-rpm.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
index 937cb1515968..482fe30ee6f0 100644
--- a/drivers/clk/qcom/clk-smd-rpm.c
+++ b/drivers/clk/qcom/clk-smd-rpm.c
@@ -151,6 +151,7 @@
 #define to_clk_smd_rpm(_hw) container_of(_hw, struct clk_smd_rpm, hw)
 
 static struct qcom_smd_rpm *rpmcc_smd_rpm;
+static bool smd_rpm_clk_scaling;
 
 struct clk_smd_rpm {
 	const int rpm_res_type;
@@ -385,6 +386,12 @@ static unsigned long clk_smd_rpm_recalc_rate(struct clk_hw *hw,
 	return r->rate;
 }
 
+bool qcom_smd_rpm_scaling_available(void)
+{
+	return smd_rpm_clk_scaling;
+}
+EXPORT_SYMBOL_GPL(qcom_smd_rpm_scaling_available);
+
 static int clk_smd_rpm_enable_scaling(void)
 {
 	int ret;
@@ -410,6 +417,8 @@ static int clk_smd_rpm_enable_scaling(void)
 		return ret;
 	}
 
+	smd_rpm_clk_scaling = true;
+
 	pr_debug("%s: RPM clock scaling is enabled\n", __func__);
 	return 0;
 }
diff --git a/include/linux/soc/qcom/smd-rpm.h b/include/linux/soc/qcom/smd-rpm.h
index 8190878645f9..420f6c79d535 100644
--- a/include/linux/soc/qcom/smd-rpm.h
+++ b/include/linux/soc/qcom/smd-rpm.h
@@ -65,4 +65,6 @@ int qcom_rpm_smd_write(struct qcom_smd_rpm *rpm,
 		       u32 resource_type, u32 resource_id,
 		       void *buf, size_t count);
 
+bool qcom_smd_rpm_scaling_available(void);
+
 #endif

-- 
2.41.0