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Message-Id: <20240718032834.53876-2-changhuang.liang@starfivetech.com>
Date: Wed, 17 Jul 2024 20:28:30 -0700
From: Changhuang Liang <changhuang.liang@...rfivetech.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
Maxime Ripard <mripard@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: Jacopo Mondi <jacopo.mondi@...asonboard.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
Jack Zhu <jack.zhu@...rfivetech.com>,
Keith Zhao <keith.zhao@...rfivetech.com>,
Changhuang Liang <changhuang.liang@...rfivetech.com>,
Jayshri Pawar <jpawar@...ence.com>,
Jai Luthra <j-luthra@...com>,
linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-staging@...ts.linux.dev
Subject: [PATCH v2 1/5] media: cadence: csi2rx: Support runtime PM
Use runtime power management hooks to save power when CSI-RX is not in
use.
Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
---
drivers/media/platform/cadence/cdns-csi2rx.c | 121 ++++++++++++-------
1 file changed, 80 insertions(+), 41 deletions(-)
diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 6f7d27a48eff..981819adbb3a 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -211,11 +211,6 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
u32 reg;
int ret;
- ret = clk_prepare_enable(csi2rx->p_clk);
- if (ret)
- return ret;
-
- reset_control_deassert(csi2rx->p_rst);
csi2rx_reset(csi2rx);
reg = csi2rx->num_lanes << 8;
@@ -253,7 +248,7 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
if (ret) {
dev_err(csi2rx->dev,
"Failed to configure external DPHY: %d\n", ret);
- goto err_disable_pclk;
+ return ret;
}
}
@@ -268,11 +263,6 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
* hence the reference counting.
*/
for (i = 0; i < csi2rx->max_streams; i++) {
- ret = clk_prepare_enable(csi2rx->pixel_clk[i]);
- if (ret)
- goto err_disable_pixclk;
-
- reset_control_deassert(csi2rx->pixel_rst[i]);
writel(CSI2RX_STREAM_CFG_FIFO_MODE_LARGE_BUF,
csi2rx->base + CSI2RX_STREAM_CFG_REG(i));
@@ -288,34 +278,18 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
}
- ret = clk_prepare_enable(csi2rx->sys_clk);
- if (ret)
- goto err_disable_pixclk;
-
- reset_control_deassert(csi2rx->sys_rst);
ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
if (ret)
- goto err_disable_sysclk;
-
- clk_disable_unprepare(csi2rx->p_clk);
+ goto err_phy_power_off;
return 0;
-err_disable_sysclk:
- clk_disable_unprepare(csi2rx->sys_clk);
-err_disable_pixclk:
- for (; i > 0; i--) {
- reset_control_assert(csi2rx->pixel_rst[i - 1]);
- clk_disable_unprepare(csi2rx->pixel_clk[i - 1]);
- }
-
+err_phy_power_off:
if (csi2rx->dphy) {
writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
phy_power_off(csi2rx->dphy);
}
-err_disable_pclk:
- clk_disable_unprepare(csi2rx->p_clk);
return ret;
}
@@ -326,10 +300,6 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
u32 val;
int ret;
- clk_prepare_enable(csi2rx->p_clk);
- reset_control_assert(csi2rx->sys_rst);
- clk_disable_unprepare(csi2rx->sys_clk);
-
for (i = 0; i < csi2rx->max_streams; i++) {
writel(CSI2RX_STREAM_CTRL_STOP,
csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
@@ -342,14 +312,8 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
if (ret)
dev_warn(csi2rx->dev,
"Failed to stop streaming on pad%u\n", i);
-
- reset_control_assert(csi2rx->pixel_rst[i]);
- clk_disable_unprepare(csi2rx->pixel_clk[i]);
}
- reset_control_assert(csi2rx->p_rst);
- clk_disable_unprepare(csi2rx->p_clk);
-
if (v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, false))
dev_warn(csi2rx->dev, "Couldn't disable our subdev\n");
@@ -374,9 +338,15 @@ static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
* enable the whole controller.
*/
if (!csi2rx->count) {
+ ret = pm_runtime_resume_and_get(csi2rx->dev);
+ if (ret < 0)
+ goto out;
+
ret = csi2rx_start(csi2rx);
- if (ret)
+ if (ret) {
+ pm_runtime_put(csi2rx->dev);
goto out;
+ }
}
csi2rx->count++;
@@ -386,8 +356,10 @@ static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
/*
* Let the last user turn off the lights.
*/
- if (!csi2rx->count)
+ if (!csi2rx->count) {
csi2rx_stop(csi2rx);
+ pm_runtime_put(csi2rx->dev);
+ }
}
out:
@@ -707,6 +679,7 @@ static int csi2rx_probe(struct platform_device *pdev)
if (ret)
goto err_cleanup;
+ pm_runtime_enable(csi2rx->dev);
ret = v4l2_async_register_subdev(&csi2rx->subdev);
if (ret < 0)
goto err_free_state;
@@ -721,6 +694,7 @@ static int csi2rx_probe(struct platform_device *pdev)
err_free_state:
v4l2_subdev_cleanup(&csi2rx->subdev);
+ pm_runtime_disable(csi2rx->dev);
err_cleanup:
v4l2_async_nf_unregister(&csi2rx->notifier);
v4l2_async_nf_cleanup(&csi2rx->notifier);
@@ -739,9 +713,73 @@ static void csi2rx_remove(struct platform_device *pdev)
v4l2_async_unregister_subdev(&csi2rx->subdev);
v4l2_subdev_cleanup(&csi2rx->subdev);
media_entity_cleanup(&csi2rx->subdev.entity);
+ pm_runtime_disable(csi2rx->dev);
kfree(csi2rx);
}
+static int csi2rx_runtime_suspend(struct device *dev)
+{
+ struct csi2rx_priv *csi2rx = dev_get_drvdata(dev);
+ unsigned int i;
+
+ reset_control_assert(csi2rx->sys_rst);
+ clk_disable_unprepare(csi2rx->sys_clk);
+
+ for (i = 0; i < csi2rx->max_streams; i++) {
+ reset_control_assert(csi2rx->pixel_rst[i]);
+ clk_disable_unprepare(csi2rx->pixel_clk[i]);
+ }
+
+ reset_control_assert(csi2rx->p_rst);
+ clk_disable_unprepare(csi2rx->p_clk);
+
+ return 0;
+}
+
+static int csi2rx_runtime_resume(struct device *dev)
+{
+ struct csi2rx_priv *csi2rx = dev_get_drvdata(dev);
+ unsigned int i;
+ int ret;
+
+ ret = clk_prepare_enable(csi2rx->p_clk);
+ if (ret)
+ return ret;
+
+ reset_control_deassert(csi2rx->p_rst);
+
+ for (i = 0; i < csi2rx->max_streams; i++) {
+ ret = clk_prepare_enable(csi2rx->pixel_clk[i]);
+ if (ret)
+ goto err_disable_pixclk;
+
+ reset_control_deassert(csi2rx->pixel_rst[i]);
+ }
+
+ ret = clk_prepare_enable(csi2rx->sys_clk);
+ if (ret)
+ goto err_disable_pixclk;
+
+ reset_control_deassert(csi2rx->sys_rst);
+
+ return ret;
+
+err_disable_pixclk:
+ for (; i > 0; i--) {
+ reset_control_assert(csi2rx->pixel_rst[i - 1]);
+ clk_disable_unprepare(csi2rx->pixel_clk[i - 1]);
+ }
+
+ reset_control_assert(csi2rx->p_rst);
+ clk_disable_unprepare(csi2rx->p_clk);
+
+ return ret;
+}
+
+static const struct dev_pm_ops csi2rx_pm_ops = {
+ SET_RUNTIME_PM_OPS(csi2rx_runtime_suspend, csi2rx_runtime_resume, NULL)
+};
+
static const struct of_device_id csi2rx_of_table[] = {
{ .compatible = "starfive,jh7110-csi2rx" },
{ .compatible = "cdns,csi2rx" },
@@ -756,6 +794,7 @@ static struct platform_driver csi2rx_driver = {
.driver = {
.name = "cdns-csi2rx",
.of_match_table = csi2rx_of_table,
+ .pm = &csi2rx_pm_ops,
},
};
module_platform_driver(csi2rx_driver);
--
2.25.1
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