linux-kernel - [PATCH v2] venus: pm_helpers: Control core power domain manually

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Message-Id: <20210113095716.15802-1-stanimir.varbanov@linaro.org>
Date:   Wed, 13 Jan 2021 11:57:16 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Fritz Koenig <frkoenig@...omium.org>,
        Dikshita Agarwal <dikshita@...eaurora.org>,
        Mansur Alisha Shaik <mansur@...eaurora.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v2] venus: pm_helpers: Control core power domain manually

Presently we use device_link to control core power domain. But this
leads to issues because the genpd doesn't guarantee synchronous on/off
for supplier devices. Switch to manually control by pmruntime calls.

Tested-by: Fritz Koenig <frkoenig@...omium.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---

changes since v1:
 * drop pd_dl_venus from struct description (Fritz)

 drivers/media/platform/qcom/venus/core.h      |  2 --
 .../media/platform/qcom/venus/pm_helpers.c    | 36 ++++++++++---------
 2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index e886023afbe9..d2482dff518e 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -91,7 +91,6 @@ struct venus_format {
  * @clks:	an array of struct clk pointers
  * @vcodec0_clks: an array of vcodec0 struct clk pointers
  * @vcodec1_clks: an array of vcodec1 struct clk pointers
- * @pd_dl_venus: pmdomain device-link for venus domain
  * @pmdomains:	an array of pmdomains struct device pointers
  * @vdev_dec:	a reference to video device structure for decoder instances
  * @vdev_enc:	a reference to video device structure for encoder instances
@@ -128,7 +127,6 @@ struct venus_core {
 	struct icc_path *cpucfg_path;
 	struct opp_table *opp_table;
 	bool has_opp_table;
-	struct device_link *pd_dl_venus;
 	struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
 	struct device_link *opp_dl_venus;
 	struct device *opp_pmdomain;
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index 0011c3aa3a73..43c4e3d9e281 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -774,13 +774,6 @@ static int vcodec_domains_get(struct device *dev)
 		core->pmdomains[i] = pd;
 	}
 
-	core->pd_dl_venus = device_link_add(dev, core->pmdomains[0],
-					    DL_FLAG_PM_RUNTIME |
-					    DL_FLAG_STATELESS |
-					    DL_FLAG_RPM_ACTIVE);
-	if (!core->pd_dl_venus)
-		return -ENODEV;
-
 skip_pmdomains:
 	if (!core->has_opp_table)
 		return 0;
@@ -807,14 +800,12 @@ static int vcodec_domains_get(struct device *dev)
 opp_dl_add_err:
 	dev_pm_opp_detach_genpd(core->opp_table);
 opp_attach_err:
-	if (core->pd_dl_venus) {
-		device_link_del(core->pd_dl_venus);
-		for (i = 0; i < res->vcodec_pmdomains_num; i++) {
-			if (IS_ERR_OR_NULL(core->pmdomains[i]))
-				continue;
-			dev_pm_domain_detach(core->pmdomains[i], true);
-		}
+	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
+		if (IS_ERR_OR_NULL(core->pmdomains[i]))
+			continue;
+		dev_pm_domain_detach(core->pmdomains[i], true);
 	}
+
 	return ret;
 }
 
@@ -827,9 +818,6 @@ static void vcodec_domains_put(struct device *dev)
 	if (!res->vcodec_pmdomains_num)
 		goto skip_pmdomains;
 
-	if (core->pd_dl_venus)
-		device_link_del(core->pd_dl_venus);
-
 	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
 		if (IS_ERR_OR_NULL(core->pmdomains[i]))
 			continue;
@@ -916,16 +904,30 @@ static void core_put_v4(struct device *dev)
 static int core_power_v4(struct device *dev, int on)
 {
 	struct venus_core *core = dev_get_drvdata(dev);
+	struct device *pmctrl = core->pmdomains[0];
 	int ret = 0;
 
 	if (on == POWER_ON) {
+		if (pmctrl) {
+			ret = pm_runtime_get_sync(pmctrl);
+			if (ret < 0) {
+				pm_runtime_put_noidle(pmctrl);
+				return ret;
+			}
+		}
+
 		ret = core_clks_enable(core);
+		if (ret < 0 && pmctrl)
+			pm_runtime_put_sync(pmctrl);
 	} else {
 		/* Drop the performance state vote */
 		if (core->opp_pmdomain)
 			dev_pm_opp_set_rate(dev, 0);
 
 		core_clks_disable(core);
+
+		if (pmctrl)
+			pm_runtime_put_sync(pmctrl);
 	}
 
 	return ret;
-- 
2.17.1