linux-kernel - [PATCH v2 1/6] drivers: qcom: rpmh-rsc: return if the controller is idle

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Message-Id: <1532685889-31345-2-git-send-email-rplsssn@codeaurora.org>
Date:   Fri, 27 Jul 2018 15:34:44 +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 v2 1/6] drivers: qcom: rpmh-rsc: return if the controller is idle

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

Allow the controller status be queried. The controller is busy if it is
actively processing request.

Signed-off-by: Lina Iyer <ilina@...eaurora.org>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
---
Changes in v2:
     - Remove unnecessary EXPORT_SYMBOL
---
 drivers/soc/qcom/rpmh-internal.h |  1 +
 drivers/soc/qcom/rpmh-rsc.c      | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index a7bbbb6..4ff43bf 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -108,6 +108,7 @@ struct rsc_drv {
 int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv,
 			     const struct tcs_request *msg);
 int rpmh_rsc_invalidate(struct rsc_drv *drv);
+bool rpmh_rsc_ctrlr_is_idle(struct rsc_drv *drv);
 
 void rpmh_tx_done(const struct tcs_request *msg, int r);
 
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 33fe9f9..42d0041 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -496,6 +496,26 @@ static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
 }
 
 /**
+ *  rpmh_rsc_ctrlr_is_idle: Check if any of the AMCs are busy.
+ *
+ *  @drv: The controller
+ *
+ *  Returns true if the TCSes are engaged in handling requests.
+ */
+bool rpmh_rsc_ctrlr_is_idle(struct rsc_drv *drv)
+{
+	int m;
+	struct tcs_group *tcs = get_tcs_of_type(drv, ACTIVE_TCS);
+
+	for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
+		if (!tcs_is_free(drv, m))
+			return false;
+	}
+
+	return true;
+}
+
+/**
  * rpmh_rsc_write_ctrl_data: Write request to the controller
  *
  * @drv: the controller
-- 
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