linux-kernel - [PATCH v9 10/10] soc: qcom: rpmhpd: Mark mx as a parent for cx

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Date:   Mon,  7 Jan 2019 15:39:59 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     andy.gross@...aro.org, robh@...nel.org, viresh.kumar@...aro.org,
        sboyd@...nel.org, ulf.hansson@...aro.org, collinsd@...eaurora.org,
        mka@...omium.org
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, henryc.chen@...iatek.com,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH v9 10/10] soc: qcom: rpmhpd: Mark mx as a parent for cx

Specify the active + sleep and active-only MX power domains as
the parents of the corresponding CX power domains. This will ensure that
performance state requests on CX automatically generate equivalent requests
on MX power domains.

This is used to enforce a requirement that exists for various
hardware blocks on SDM845 that MX performance state >= CX performance
state for a given operating frequency.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/soc/qcom/rpmhpd.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
index 38c8a11c92c8..edf67de65f6a 100644
--- a/drivers/soc/qcom/rpmhpd.c
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -97,12 +97,14 @@ static struct rpmhpd sdm845_cx_ao;
 static struct rpmhpd sdm845_cx = {
 	.pd = { .name = "cx", },
 	.peer = &sdm845_cx_ao,
+	.parent = &sdm845_mx.pd,
 	.res_name = "cx.lvl",
 };
 
 static struct rpmhpd sdm845_cx_ao = {
 	.pd = { .name = "cx_ao", },
 	.peer = &sdm845_cx,
+	.parent = &sdm845_mx_ao.pd,
 	.res_name = "cx.lvl",
 };
 
@@ -372,6 +374,15 @@ static int rpmhpd_probe(struct platform_device *pdev)
 		data->domains[i] = &rpmhpds[i]->pd;
 	}
 
+	/* Add subdomains */
+	for (i = 0; i < num_pds; i++) {
+		if (!rpmhpds[i])
+			continue;
+		if (rpmhpds[i]->parent)
+			pm_genpd_add_subdomain(rpmhpds[i]->parent,
+					       &rpmhpds[i]->pd);
+	}
+
 	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 }
 
-- 
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