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Date:   Mon, 21 Jan 2019 21:51:09 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Sibi Sankar <sibis@...eaurora.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 07/10] remoteproc: q6v5-mss: Vote for rpmh power domains

From: Rajendra Nayak <rnayak@...eaurora.org>

With rpmh ARC resources being modelled as power domains with performance
state, we need to proxy vote on these for SDM845.
Add support to vote on multiple of them, now that genpd supports
associating mutliple power domains to a device.

Tested-by: Sibi Sankar <sibis@...eaurora.org>
Reviewed-by: Sibi Sankar <sibis@...eaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
[bjorn: Drop device link, improve error handling, name things "proxy"]
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v2:
- Disable proxy pds if handover did not arrived before stop

 drivers/remoteproc/qcom_q6v5_mss.c | 117 ++++++++++++++++++++++++++++-
 1 file changed, 113 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 01be7314e176..003186ce56c7 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -25,6 +25,8 @@
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/remoteproc.h>
@@ -131,6 +133,7 @@ struct rproc_hexagon_res {
 	char **proxy_clk_names;
 	char **reset_clk_names;
 	char **active_clk_names;
+	char **proxy_pd_names;
 	int version;
 	bool need_mem_protection;
 	bool has_alt_reset;
@@ -156,9 +159,11 @@ struct q6v5 {
 	struct clk *active_clks[8];
 	struct clk *reset_clks[4];
 	struct clk *proxy_clks[4];
+	struct device *proxy_pds[3];
 	int active_clk_count;
 	int reset_clk_count;
 	int proxy_clk_count;
+	int proxy_pd_count;
 
 	struct reg_info active_regs[1];
 	struct reg_info proxy_regs[3];
@@ -321,6 +326,41 @@ static void q6v5_clk_disable(struct device *dev,
 		clk_disable_unprepare(clks[i]);
 }
 
+static int q6v5_pds_enable(struct q6v5 *qproc, struct device **pds,
+			   size_t pd_count)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < pd_count; i++) {
+		dev_pm_genpd_set_performance_state(pds[i], INT_MAX);
+		ret = pm_runtime_get_sync(pds[i]);
+		if (ret < 0)
+			goto unroll_pd_votes;
+	}
+
+	return 0;
+
+unroll_pd_votes:
+	for (i--; i >= 0; i--) {
+		dev_pm_genpd_set_performance_state(pds[i], 0);
+		pm_runtime_put(pds[i]);
+	}
+
+	return ret;
+};
+
+static void q6v5_pds_disable(struct q6v5 *qproc, struct device **pds,
+			     size_t pd_count)
+{
+	int i;
+
+	for (i = 0; i < pd_count; i++) {
+		dev_pm_genpd_set_performance_state(pds[i], 0);
+		pm_runtime_put(pds[i]);
+	}
+}
+
 static int q6v5_xfer_mem_ownership(struct q6v5 *qproc, int *current_perm,
 				   bool remote_owner, phys_addr_t addr,
 				   size_t size)
@@ -690,11 +730,17 @@ static int q6v5_mba_load(struct q6v5 *qproc)
 
 	qcom_q6v5_prepare(&qproc->q6v5);
 
+	ret = q6v5_pds_enable(qproc, qproc->proxy_pds, qproc->proxy_pd_count);
+	if (ret < 0) {
+		dev_err(qproc->dev, "failed to enable proxy power domains\n");
+		goto disable_irqs;
+	}
+
 	ret = q6v5_regulator_enable(qproc, qproc->proxy_regs,
 				    qproc->proxy_reg_count);
 	if (ret) {
 		dev_err(qproc->dev, "failed to enable proxy supplies\n");
-		goto disable_irqs;
+		goto disable_proxy_pds;
 	}
 
 	ret = q6v5_clk_enable(qproc->dev, qproc->proxy_clks,
@@ -791,6 +837,8 @@ static int q6v5_mba_load(struct q6v5 *qproc)
 disable_proxy_reg:
 	q6v5_regulator_disable(qproc, qproc->proxy_regs,
 			       qproc->proxy_reg_count);
+disable_proxy_pds:
+	q6v5_pds_disable(qproc, qproc->proxy_pds, qproc->proxy_pd_count);
 disable_irqs:
 	qcom_q6v5_unprepare(&qproc->q6v5);
 
@@ -841,6 +889,8 @@ static void q6v5_mba_reclaim(struct q6v5 *qproc)
 
 	ret = qcom_q6v5_unprepare(&qproc->q6v5);
 	if (ret) {
+		q6v5_pds_disable(qproc, qproc->proxy_pds,
+				 qproc->proxy_pd_count);
 		q6v5_clk_disable(qproc->dev, qproc->proxy_clks,
 				 qproc->proxy_clk_count);
 		q6v5_regulator_disable(qproc, qproc->proxy_regs,
@@ -1121,6 +1171,7 @@ static void qcom_msa_handover(struct qcom_q6v5 *q6v5)
 			 qproc->proxy_clk_count);
 	q6v5_regulator_disable(qproc, qproc->proxy_regs,
 			       qproc->proxy_reg_count);
+	q6v5_pds_disable(qproc, qproc->proxy_pds, qproc->proxy_pd_count);
 }
 
 static int q6v5_init_mem(struct q6v5 *qproc, struct platform_device *pdev)
@@ -1181,6 +1232,45 @@ static int q6v5_init_clocks(struct device *dev, struct clk **clks,
 	return i;
 }
 
+static int q6v5_pds_attach(struct device *dev, struct device **devs,
+			   char **pd_names)
+{
+	size_t num_pds = 0;
+	int ret;
+	int i;
+
+	if (!pd_names)
+		return 0;
+
+	while (pd_names[num_pds])
+		num_pds++;
+
+	for (i = 0; i < num_pds; i++) {
+		devs[i] = dev_pm_domain_attach_by_name(dev, pd_names[i]);
+		if (IS_ERR(devs[i])) {
+			ret = PTR_ERR(devs[i]);
+			goto unroll_attach;
+		}
+	}
+
+	return num_pds;
+
+unroll_attach:
+	for (i--; i >= 0; i--)
+		dev_pm_domain_detach(devs[i], false);
+
+	return ret;
+};
+
+static void q6v5_pds_detach(struct q6v5 *qproc, struct device **pds,
+			    size_t pd_count)
+{
+	int i;
+
+	for (i = 0; i < pd_count; i++)
+		dev_pm_domain_detach(pds[i], false);
+}
+
 static int q6v5_init_reset(struct q6v5 *qproc)
 {
 	qproc->mss_restart = devm_reset_control_get_exclusive(qproc->dev,
@@ -1322,10 +1412,18 @@ static int q6v5_probe(struct platform_device *pdev)
 	}
 	qproc->active_reg_count = ret;
 
+	ret = q6v5_pds_attach(&pdev->dev, qproc->proxy_pds,
+			      desc->proxy_pd_names);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to init power domains\n");
+		goto free_rproc;
+	}
+	qproc->proxy_pd_count = ret;
+
 	qproc->has_alt_reset = desc->has_alt_reset;
 	ret = q6v5_init_reset(qproc);
 	if (ret)
-		goto free_rproc;
+		goto detach_proxy_pds;
 
 	qproc->version = desc->version;
 	qproc->need_mem_protection = desc->need_mem_protection;
@@ -1333,7 +1431,7 @@ static int q6v5_probe(struct platform_device *pdev)
 	ret = qcom_q6v5_init(&qproc->q6v5, pdev, rproc, MPSS_CRASH_REASON_SMEM,
 			     qcom_msa_handover);
 	if (ret)
-		goto free_rproc;
+		goto detach_proxy_pds;
 
 	qproc->mpss_perm = BIT(QCOM_SCM_VMID_HLOS);
 	qproc->mba_perm = BIT(QCOM_SCM_VMID_HLOS);
@@ -1344,10 +1442,12 @@ static int q6v5_probe(struct platform_device *pdev)
 
 	ret = rproc_add(rproc);
 	if (ret)
-		goto free_rproc;
+		goto detach_proxy_pds;
 
 	return 0;
 
+detach_proxy_pds:
+	q6v5_pds_detach(qproc, qproc->proxy_pds, qproc->proxy_pd_count);
 free_rproc:
 	rproc_free(rproc);
 
@@ -1364,6 +1464,9 @@ static int q6v5_remove(struct platform_device *pdev)
 	qcom_remove_glink_subdev(qproc->rproc, &qproc->glink_subdev);
 	qcom_remove_smd_subdev(qproc->rproc, &qproc->smd_subdev);
 	qcom_remove_ssr_subdev(qproc->rproc, &qproc->ssr_subdev);
+
+	q6v5_pds_detach(qproc, qproc->proxy_pds, qproc->proxy_pd_count);
+
 	rproc_free(qproc->rproc);
 
 	return 0;
@@ -1388,6 +1491,12 @@ static const struct rproc_hexagon_res sdm845_mss = {
 			"mnoc_axi",
 			NULL
 	},
+	.proxy_pd_names = (char*[]){
+			"cx",
+			"mx",
+			"mss",
+			NULL
+	},
 	.need_mem_protection = true,
 	.has_alt_reset = true,
 	.version = MSS_SDM845,
-- 
2.18.0

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