From: Mirela Rabulea <mirela.rabulea@xxxxxxxxxxx>
Save some power by disabling/enabling the jpeg clocks with
every stream stop/start.
Do not use DL_FLAG_RPM_ACTIVE in mxc_jpeg_attach_pm_domains,
to ensure power domains are off after probe.
Signed-off-by: Mirela Rabulea <mirela.rabulea@xxxxxxxxxxx>
---
Changes in v2:
- Use pm_runtime_resume_and_get instead of pm_runtime_get_sync. Thanks Hans, for pointing it out!
- Drop pm_runtime get/put from mxc_jpeg_open/release. Enough to do it in stream start/stop.
- Do not use DL_FLAG_RPM_ACTIVE in mxc_jpeg_attach_pm_domains, to ensure pd's are off after probe. This was masked by the fact that in _v1, mxc_jpeg_release was doing pm_runtime_put_sync.
- Update commit description
drivers/media/platform/imx-jpeg/mxc-jpeg.c | 73 +++++++++++++++++++++-
drivers/media/platform/imx-jpeg/mxc-jpeg.h | 2 +
2 files changed, 72 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
index e45b0c74be55..4ca96cf9def7 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
@@ -49,6 +49,7 @@
#include <linux/slab.h>
#include <linux/irqreturn.h>
#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include <linux/string.h>
@@ -1078,10 +1079,17 @@ static int mxc_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
{
struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
struct mxc_jpeg_q_data *q_data = mxc_jpeg_get_q_data(ctx, q->type);
+ int ret;
dev_dbg(ctx->mxc_jpeg->dev, "Start streaming ctx=%p", ctx);
q_data->sequence = 0;
+ ret = pm_runtime_resume_and_get(ctx->mxc_jpeg->dev);
+ if (ret < 0) {
+ dev_err(ctx->mxc_jpeg->dev, "Failed to power up jpeg\n");
+ return ret;
+ }
+
return 0;
}
@@ -1099,9 +1107,10 @@ static void mxc_jpeg_stop_streaming(struct vb2_queue *q)
else
vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
if (!vbuf)
- return;
+ break;
v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
}
+ pm_runtime_put_sync(&ctx->mxc_jpeg->pdev->dev);
}
static int mxc_jpeg_valid_comp_id(struct device *dev,
@@ -1961,8 +1970,7 @@ static int mxc_jpeg_attach_pm_domains(struct mxc_jpeg_dev *jpeg)
jpeg->pd_link[i] = device_link_add(dev, jpeg->pd_dev[i],
DL_FLAG_STATELESS |
- DL_FLAG_PM_RUNTIME |
- DL_FLAG_RPM_ACTIVE);
+ DL_FLAG_PM_RUNTIME);
if (!jpeg->pd_link[i]) {
ret = -EINVAL;
goto fail;
@@ -2025,6 +2033,19 @@ static int mxc_jpeg_probe(struct platform_device *pdev)
jpeg->dev = dev;
jpeg->mode = mode;
+ /* Get clocks */
+ jpeg->clk_ipg = devm_clk_get(dev, "ipg");
+ if (IS_ERR(jpeg->clk_ipg)) {
+ dev_err(dev, "failed to get clock: ipg\n");
+ goto err_clk;
+ }
+
+ jpeg->clk_per = devm_clk_get(dev, "per");
+ if (IS_ERR(jpeg->clk_per)) {
+ dev_err(dev, "failed to get clock: per\n");
+ goto err_clk;
+ }
+
ret = mxc_jpeg_attach_pm_domains(jpeg);
if (ret < 0) {
dev_err(dev, "failed to attach power domains %d\n", ret);
@@ -2093,6 +2114,7 @@ static int mxc_jpeg_probe(struct platform_device *pdev)
jpeg->dec_vdev->minor);
platform_set_drvdata(pdev, jpeg);
+ pm_runtime_enable(dev);
return 0;
@@ -2109,9 +2131,52 @@ static int mxc_jpeg_probe(struct platform_device *pdev)
mxc_jpeg_detach_pm_domains(jpeg);
err_irq:
+err_clk:
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static int mxc_jpeg_runtime_resume(struct device *dev)
+{
+ struct mxc_jpeg_dev *jpeg = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(jpeg->clk_ipg);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable clock: ipg\n");
+ goto err_ipg;
+ }
+
+ ret = clk_prepare_enable(jpeg->clk_per);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable clock: per\n");
+ goto err_per;
+ }
+
+ return 0;
+
+err_per:
+ clk_disable_unprepare(jpeg->clk_ipg);
+err_ipg:
return ret;
}
+static int mxc_jpeg_runtime_suspend(struct device *dev)
+{
+ struct mxc_jpeg_dev *jpeg = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(jpeg->clk_ipg);
+ clk_disable_unprepare(jpeg->clk_per);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops mxc_jpeg_pm_ops = {
+ SET_RUNTIME_PM_OPS(mxc_jpeg_runtime_suspend,
+ mxc_jpeg_runtime_resume, NULL)
+};
+
static int mxc_jpeg_remove(struct platform_device *pdev)
{
unsigned int slot;
@@ -2120,6 +2185,7 @@ static int mxc_jpeg_remove(struct platform_device *pdev)
for (slot = 0; slot < MXC_MAX_SLOTS; slot++)
mxc_jpeg_free_slot_data(jpeg, slot);
+ pm_runtime_disable(&pdev->dev);
video_unregister_device(jpeg->dec_vdev);
v4l2_m2m_release(jpeg->m2m_dev);
v4l2_device_unregister(&jpeg->v4l2_dev);
@@ -2136,6 +2202,7 @@ static struct platform_driver mxc_jpeg_driver = {
.driver = {
.name = "mxc-jpeg",
.of_match_table = mxc_jpeg_match,
+ .pm = &mxc_jpeg_pm_ops,
},
};
module_platform_driver(mxc_jpeg_driver);
diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.h b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
index 4c210852e876..9fb2a5aaa941 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg.h
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
@@ -109,6 +109,8 @@ struct mxc_jpeg_dev {
spinlock_t hw_lock; /* hardware access lock */
unsigned int mode;
struct mutex lock; /* v4l2 ioctls serialization */
+ struct clk *clk_ipg;
+ struct clk *clk_per;
struct platform_device *pdev;
struct device *dev;
void __iomem *base_reg;
--
2.25.1
