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Message-Id: <20210611140124.v2.6.If7d6a147afd8880940c42d7998e47ed3869e8805@changeid>
Date: Fri, 11 Jun 2021 14:01:43 +1000
From: Eizan Miyamoto <eizan@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: houlong.wei@...iatek.com, enric.balletbo@...labora.com,
yong.wu@...iatek.com, chunkuang.hu@...nel.org,
Eizan Miyamoto <eizan@...omium.org>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 6/8] media: mtk-mdp: propagate errors better in pm_suspend/resume
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@...omium.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 3d9bb7265159..59911ee063c1 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -53,39 +53,81 @@ 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;
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 7ad9b06bb11b..2bd229cc7eae 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
@@ -21,10 +21,10 @@ 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 48e9a557c446..523e3c2798e1 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -49,8 +49,9 @@ 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;
/*
@@ -58,18 +59,41 @@ 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
@@ -77,6 +101,17 @@ 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)
@@ -317,18 +352,14 @@ 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)
--
2.32.0.272.g935e593368-goog
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