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From: Eizan Miyamoto <eizan@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: wenst@chromium.org, chunkuang.hu@kernel.org,
	yong.wu@mediatek.com, enric.balletbo@collabora.com,
	houlong.wei@mediatek.com, Eizan Miyamoto <eizan@chromium.org>,
	Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Minghsiu Tsai <minghsiu.tsai@mediatek.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org
Subject: [PATCH v5 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume
Date: Fri,  9 Jul 2021 12:23:22 +1000	[thread overview]
Message-ID: <20210709122040.v5.6.If7d6a147afd8880940c42d7998e47ed3869e8805@changeid> (raw)
In-Reply-To: <20210709022324.1607884-1-eizan@chromium.org>

Up until this change, many errors were logged but ignored when powering
on clocks and calling pm_runtime_get/put() inside mtk_mdp_core. This
change tries to do a better job at propagating errors back to the power
management framework.

Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
---

(no changes since v1)

 drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 62 ++++++++++++++++---
 drivers/media/platform/mtk-mdp/mtk_mdp_comp.h |  6 +-
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 57 +++++++++++++----
 3 files changed, 99 insertions(+), 26 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
index 8a9267d0da1e..87e3f72ff02b 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match);
 
-void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
 {
-	int err;
+	int status, err;
 
 	if (comp->larb_dev) {
 		err = mtk_smi_larb_get(comp->larb_dev);
@@ -65,34 +65,76 @@ void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp)
 	}
 
 	err = pm_runtime_get_sync(comp->dev);
-	if (err < 0)
+	if (err < 0) {
 		dev_err(comp->dev, "failed to runtime get, err %d.\n", err);
+		return err;
+	}
+
+	err = mtk_mdp_comp_clock_on(comp);
+	if (err) {
+		dev_err(comp->dev, "failed to turn on clock. err=%d", err);
+		status = err;
+		goto err_mtk_mdp_comp_clock_on;
+	}
+
+	return err;
+
+err_mtk_mdp_comp_clock_on:
+	err = pm_runtime_put_sync(comp->dev);
+	if (err)
+		dev_err(comp->dev, "failed to runtime put in cleanup. err=%d", err);
 
-	mtk_mdp_comp_clock_on(comp);
+	return status;
 }
 
-void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp)
 {
-	int err;
+	int status, err;
 
 	mtk_mdp_comp_clock_off(comp);
 
 	err = pm_runtime_put_sync(comp->dev);
-	if (err < 0)
+	if (err < 0) {
 		dev_err(comp->dev, "failed to runtime put, err %d.\n", err);
+		status = err;
+		goto err_pm_runtime_put_sync;
+	}
+
+	return 0;
+
+err_pm_runtime_put_sync:
+	err = mtk_mdp_comp_clock_on(comp);
+	if (err)
+		dev_err(comp->dev, "failed to turn on clock in cleanup. err=%d", err);
+
+	return status;
 }
 
-void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
+int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp)
 {
-	int i, err;
+	int i, err, status;
 
 	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 		if (IS_ERR(comp->clk[i]))
 			continue;
 		err = clk_prepare_enable(comp->clk[i]);
-		if (err)
+		if (err) {
+			status = err;
 			dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i);
+			goto err_clk_prepare_enable;
+		}
+	}
+
+	return 0;
+
+err_clk_prepare_enable:
+	for (--i; i >= 0; i--) {
+		if (IS_ERR(comp->clk[i]))
+			continue;
+		clk_disable_unprepare(comp->clk[i]);
 	}
+
+	return status;
 }
 
 void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp)
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
index 15ef9539a5a7..5201c47f7baa 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -23,10 +23,10 @@ struct mtk_mdp_comp {
 
 int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev);
 
-void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
-void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp);
 
-void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp);
 void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp);
 
 extern struct platform_driver mtk_mdp_component_driver;
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 74ef37eb50bd..b45d588d2659 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -50,8 +50,9 @@ static const struct of_device_id mtk_mdp_of_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
 
-static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
+static int mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 {
+	int err, status;
 	struct mtk_mdp_comp *comp_node;
 
 	/*
@@ -59,18 +60,41 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
 	 * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to
 	 * have mtk_mdp_comp_power_on called on it.
 	 */
-	mtk_mdp_comp_clock_on(&mdp->comp_self);
+	err = mtk_mdp_comp_clock_on(&mdp->comp_self);
+	if (err)
+		return err;
+
+	list_for_each_entry(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_on(comp_node);
+		if (err) {
+			status = err;
+			goto err_mtk_mdp_comp_power_on;
+		}
+	}
 
-	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_power_on(comp_node);
+	return 0;
+
+err_mtk_mdp_comp_power_on:
+	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_off(comp_node);
+		if (err)
+			dev_err(&mdp->pdev->dev, "failed to power off after error. err=%d", err);
+	}
+	return status;
 }
 
-static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
+static int mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 {
+	int status, err;
 	struct mtk_mdp_comp *comp_node;
 
-	list_for_each_entry(comp_node, &mdp->comp_list, node)
-		mtk_mdp_comp_power_off(comp_node);
+	list_for_each_entry(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_off(comp_node);
+		if (err) {
+			status = err;
+			goto err_mtk_mdp_comp_power_off;
+		}
+	}
 
 	/*
 	 * The master / rdma0 component will have pm_runtime_put called
@@ -78,6 +102,17 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
 	 * have mtk_mdp_comp_power_off called on it.
 	 */
 	mtk_mdp_comp_clock_off(&mdp->comp_self);
+
+	return 0;
+
+err_mtk_mdp_comp_power_off:
+	list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node) {
+		err = mtk_mdp_comp_power_on(comp_node);
+		if (err)
+			dev_err(&mdp->pdev->dev, "failed to power on after error. err=%d", err);
+	}
+
+	return status;
 }
 
 static void mtk_mdp_wdt_worker(struct work_struct *work)
@@ -318,18 +353,14 @@ static int __maybe_unused mtk_mdp_pm_suspend(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
-	mtk_mdp_clock_off(mdp);
-
-	return 0;
+	return mtk_mdp_clock_off(mdp);
 }
 
 static int __maybe_unused mtk_mdp_pm_resume(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
-	mtk_mdp_clock_on(mdp);
-
-	return 0;
+	return mtk_mdp_clock_on(mdp);
 }
 
 static int __maybe_unused mtk_mdp_suspend(struct device *dev)
-- 
2.32.0.93.g670b81a890-goog


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  parent reply	other threads:[~2021-07-09  2:26 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-09  2:23 [PATCH v5 0/8] Refactor MTK MDP driver into core/components Eizan Miyamoto
2021-07-09  2:23 ` [PATCH v5 1/8] mtk-mdp: add driver to probe mdp components Eizan Miyamoto
2021-07-12 10:11   ` Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 2/8] mtk-mdp: use pm_runtime in MDP component driver Eizan Miyamoto
2021-07-12 10:12   ` Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 3/8] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Eizan Miyamoto
2021-07-12 10:12   ` Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 4/8] mtk-mdp: soc: mediatek: register mdp from mmsys Eizan Miyamoto
2021-07-12 10:12   ` Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 5/8] media: mtk-mdp: search for vpu node instead of linking it to a property Eizan Miyamoto
2021-07-09  2:23 ` Eizan Miyamoto [this message]
2021-07-12 10:12   ` [PATCH v5 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 7/8] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master Eizan Miyamoto
2021-07-12 10:12   ` Enric Balletbo i Serra
2021-07-09  2:23 ` [PATCH v5 8/8] dts: mtk-mdp: remove mediatek, vpu property from primary MDP device Eizan Miyamoto
2021-07-12 10:13   ` [PATCH v5 8/8] dts: mtk-mdp: remove mediatek,vpu " Enric Balletbo i Serra

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