linux-kernel - [PATCH 6/6] drivers: qcom: rpmh: write PDC data

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Date:   Thu, 19 Jul 2018 14:49:35 +0530
From:   Raju P L S S S N <rplsssn@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Cc:     rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, sboyd@...nel.org,
        evgreen@...omium.org, dianders@...omium.org, mka@...omium.org,
        ilina@...eaurora.org, "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>
Subject: [PATCH 6/6] drivers: qcom: rpmh: write PDC data

From: Lina Iyer <ilina@...eaurora.org>

In addition to requests that are send to the remote processor, the
controller may allow certain data to be written to the controller for
use in specific cases like wakeup value when entering idle states.
Allow a pass through to write PDC data.

Signed-off-by: Lina Iyer <ilina@...eaurora.org>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
---
 drivers/soc/qcom/rpmh.c | 28 ++++++++++++++++++++++++++++
 include/soc/qcom/rpmh.h |  6 ++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index 0d276fd..f81488b 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -472,6 +472,34 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state,
 }
 EXPORT_SYMBOL(rpmh_write_batch);
 
+/**
+ * rpmh_write_pdc_data: Write PDC data to the controller
+ *
+ * @dev: the device making the request
+ * @cmd: The payload data
+ * @n: The number of elements in payload
+ *
+ * Write PDC data to the controller. The messages are always sent async.
+ *
+ * May be called from atomic contexts.
+ */
+int rpmh_write_pdc_data(const struct device *dev,
+			const struct tcs_cmd *cmd, u32 n)
+{
+	DEFINE_RPMH_MSG_ONSTACK(dev, 0, NULL, rpm_msg);
+	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
+
+	if (!n || n > MAX_RPMH_PAYLOAD)
+		return -EINVAL;
+
+	memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));
+	rpm_msg.msg.num_cmds = n;
+	rpm_msg.msg.wait_for_compl = false;
+
+	return rpmh_rsc_write_pdc_data(ctrlr_to_drv(ctrlr), &rpm_msg.msg);
+}
+EXPORT_SYMBOL(rpmh_write_pdc_data);
+
 static int is_req_valid(struct cache_req *req)
 {
 	return (req->sleep_val != UINT_MAX &&
diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h
index 018788d..d5e736e 100644
--- a/include/soc/qcom/rpmh.h
+++ b/include/soc/qcom/rpmh.h
@@ -28,6 +28,9 @@ int rpmh_write_batch(const struct device *dev, enum rpmh_state state,
 
 int rpmh_mode_solver_set(const struct device *dev, bool enable);
 
+int rpmh_write_pdc_data(const struct device *dev,
+			const struct tcs_cmd *cmd, u32 n);
+
 #else
 
 static inline int rpmh_write(const struct device *dev, enum rpmh_state state,
@@ -56,6 +59,9 @@ static inline int rpmh_ctrlr_idle(const struct device *dev)
 static inline int rpmh_mode_solver_set(const struct device *dev, bool enable)
 { return -ENODEV; }
 
+static inline int rpmh_write_pdc_data(const struct device *dev,
+				      const struct tcs_cmd *cmd, u32 n)
+{ return -ENODEV; }
 #endif /* CONFIG_QCOM_RPMH */
 
 #endif /* __SOC_QCOM_RPMH_H__ */
-- 
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