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Subject[PATCH v3 18/35] media: camss: Add basic runtime PM support
Date
There is a PM domain for each of the VFE hardware modules. Add
support for basic runtime PM support to be able to control the
PM domains. When a PM domain needs to be powered on - a device
link is created. When a PM domain needs to be powered off -
its device link is removed. This allows separate and
independent control of the PM domains.

Suspend/Resume is still not supported.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
---
drivers/media/platform/qcom/camss/camss-csid.c | 4 ++
drivers/media/platform/qcom/camss/camss-csiphy.c | 5 ++
drivers/media/platform/qcom/camss/camss-ispif.c | 19 ++++++-
drivers/media/platform/qcom/camss/camss-vfe.c | 13 +++++
drivers/media/platform/qcom/camss/camss.c | 63 ++++++++++++++++++++++++
drivers/media/platform/qcom/camss/camss.h | 11 +++++
6 files changed, 113 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
index 627ef44..ea2b0ba 100644
--- a/drivers/media/platform/qcom/camss/camss-csid.c
+++ b/drivers/media/platform/qcom/camss/camss-csid.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <media/media-entity.h>
#include <media/v4l2-device.h>
@@ -316,6 +317,8 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
if (on) {
u32 hw_version;

+ pm_runtime_get_sync(dev);
+
ret = regulator_enable(csid->vdda);
if (ret < 0)
return ret;
@@ -348,6 +351,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
disable_irq(csid->irq);
camss_disable_clocks(csid->nclocks, csid->clock);
ret = regulator_disable(csid->vdda);
+ pm_runtime_put_sync(dev);
}

return ret;
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index 0383e94..2db78791 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <media/media-entity.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
@@ -240,6 +241,8 @@ static int csiphy_set_power(struct v4l2_subdev *sd, int on)
u8 hw_version;
int ret;

+ pm_runtime_get_sync(dev);
+
ret = csiphy_set_clock_rates(csiphy);
if (ret < 0)
return ret;
@@ -259,6 +262,8 @@ static int csiphy_set_power(struct v4l2_subdev *sd, int on)
disable_irq(csiphy->irq);

camss_disable_clocks(csiphy->nclocks, csiphy->clock);
+
+ pm_runtime_put_sync(dev);
}

return 0;
diff --git a/drivers/media/platform/qcom/camss/camss-ispif.c b/drivers/media/platform/qcom/camss/camss-ispif.c
index ed50cc5..8b04f8a 100644
--- a/drivers/media/platform/qcom/camss/camss-ispif.c
+++ b/drivers/media/platform/qcom/camss/camss-ispif.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <media/media-entity.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
@@ -169,6 +170,14 @@ static int ispif_reset(struct ispif_device *ispif)
u32 val;
int ret;

+ ret = camss_pm_domain_on(to_camss(ispif), PM_DOMAIN_VFE0);
+ if (ret < 0)
+ return ret;
+
+ ret = camss_pm_domain_on(to_camss(ispif), PM_DOMAIN_VFE1);
+ if (ret < 0)
+ return ret;
+
ret = camss_enable_clocks(ispif->nclocks_for_reset,
ispif->clock_for_reset,
to_device(ispif));
@@ -201,12 +210,15 @@ static int ispif_reset(struct ispif_device *ispif)
msecs_to_jiffies(ISPIF_RESET_TIMEOUT_MS));
if (!time) {
dev_err(to_device(ispif), "ISPIF reset timeout\n");
- return -EIO;
+ ret = -EIO;
}

camss_disable_clocks(ispif->nclocks_for_reset, ispif->clock_for_reset);

- return 0;
+ camss_pm_domain_off(to_camss(ispif), PM_DOMAIN_VFE0);
+ camss_pm_domain_off(to_camss(ispif), PM_DOMAIN_VFE1);
+
+ return ret;
}

/*
@@ -232,6 +244,8 @@ static int ispif_set_power(struct v4l2_subdev *sd, int on)
goto exit;
}

+ pm_runtime_get_sync(dev);
+
ret = camss_enable_clocks(ispif->nclocks, ispif->clock, dev);
if (ret < 0)
goto exit;
@@ -252,6 +266,7 @@ static int ispif_set_power(struct v4l2_subdev *sd, int on)
goto exit;
} else if (ispif->power_count == 1) {
camss_disable_clocks(ispif->nclocks, ispif->clock);
+ pm_runtime_put_sync(dev);
}

ispif->power_count--;
diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index 3f589c4..4afbef8 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -15,6 +15,7 @@
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/spinlock_types.h>
#include <linux/spinlock.h>
#include <media/media-entity.h>
@@ -1981,6 +1982,12 @@ static int vfe_get(struct vfe_device *vfe)
mutex_lock(&vfe->power_lock);

if (vfe->power_count == 0) {
+ ret = camss_pm_domain_on(vfe->camss, vfe->id);
+ if (ret < 0)
+ goto error_pm_domain;
+
+ pm_runtime_get_sync(vfe->camss->dev);
+
ret = vfe_set_clock_rates(vfe);
if (ret < 0)
goto error_clocks;
@@ -2012,6 +2019,10 @@ static int vfe_get(struct vfe_device *vfe)
camss_disable_clocks(vfe->nclocks, vfe->clock);

error_clocks:
+ pm_runtime_put_sync(vfe->camss->dev);
+ camss_pm_domain_off(vfe->camss, vfe->id);
+
+error_pm_domain:
mutex_unlock(&vfe->power_lock);

return ret;
@@ -2034,6 +2045,8 @@ static void vfe_put(struct vfe_device *vfe)
vfe_halt(vfe);
}
camss_disable_clocks(vfe->nclocks, vfe->clock);
+ pm_runtime_put_sync(vfe->camss->dev);
+ camss_pm_domain_off(vfe->camss, vfe->id);
}

vfe->power_count--;
diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index 171e2c9..dcc0c30 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -14,6 +14,8 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

@@ -393,6 +395,26 @@ int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock)
return 0;
}

+int camss_pm_domain_on(struct camss *camss, int id)
+{
+ if (camss->version == CAMSS_8x96) {
+ camss->genpd_link[id] = device_link_add(camss->dev,
+ camss->genpd[id], DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+
+ if (!camss->genpd_link[id])
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void camss_pm_domain_off(struct camss *camss, int id)
+{
+ if (camss->version == CAMSS_8x96)
+ device_link_del(camss->genpd_link[id]);
+}
+
/*
* camss_of_parse_endpoint_node - Parse port endpoint node
* @dev: Device
@@ -896,6 +918,23 @@ static int camss_probe(struct platform_device *pdev)
}
}

+ if (camss->version == CAMSS_8x96) {
+ camss->genpd[PM_DOMAIN_VFE0] = dev_pm_domain_attach_by_id(
+ camss->dev, PM_DOMAIN_VFE0);
+ if (IS_ERR(camss->genpd[PM_DOMAIN_VFE0]))
+ return PTR_ERR(camss->genpd[PM_DOMAIN_VFE0]);
+
+ camss->genpd[PM_DOMAIN_VFE1] = dev_pm_domain_attach_by_id(
+ camss->dev, PM_DOMAIN_VFE1);
+ if (IS_ERR(camss->genpd[PM_DOMAIN_VFE1])) {
+ dev_pm_domain_detach(camss->genpd[PM_DOMAIN_VFE0],
+ true);
+ return PTR_ERR(camss->genpd[PM_DOMAIN_VFE1]);
+ }
+ }
+
+ pm_runtime_enable(dev);
+
return 0;

err_register_subdevs:
@@ -912,6 +951,13 @@ void camss_delete(struct camss *camss)
media_device_unregister(&camss->media_dev);
media_device_cleanup(&camss->media_dev);

+ pm_runtime_disable(camss->dev);
+
+ if (camss->version == CAMSS_8x96) {
+ dev_pm_domain_detach(camss->genpd[PM_DOMAIN_VFE0], true);
+ dev_pm_domain_detach(camss->genpd[PM_DOMAIN_VFE1], true);
+ }
+
kfree(camss);
}

@@ -947,12 +993,29 @@ static const struct of_device_id camss_dt_match[] = {

MODULE_DEVICE_TABLE(of, camss_dt_match);

+static int camss_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int camss_runtime_resume(struct device *dev)
+{
+ return 0;
+}
+
+static const struct dev_pm_ops camss_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(camss_runtime_suspend, camss_runtime_resume, NULL)
+};
+
static struct platform_driver qcom_camss_driver = {
.probe = camss_probe,
.remove = camss_remove,
.driver = {
.name = "qcom-camss",
.of_match_table = camss_dt_match,
+ .pm = &camss_pm_ops,
},
};

diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
index dff1045..418996d 100644
--- a/drivers/media/platform/qcom/camss/camss.h
+++ b/drivers/media/platform/qcom/camss/camss.h
@@ -10,6 +10,7 @@
#ifndef QC_MSM_CAMSS_H
#define QC_MSM_CAMSS_H

+#include <linux/device.h>
#include <linux/types.h>
#include <media/v4l2-async.h>
#include <media/v4l2-device.h>
@@ -56,6 +57,12 @@ struct resources_ispif {
char *interrupt;
};

+enum pm_domain {
+ PM_DOMAIN_VFE0,
+ PM_DOMAIN_VFE1,
+ PM_DOMAIN_COUNT
+};
+
enum camss_version {
CAMSS_8x16,
CAMSS_8x96,
@@ -75,6 +82,8 @@ struct camss {
int vfe_num;
struct vfe_device *vfe;
atomic_t ref_count;
+ struct device *genpd[PM_DOMAIN_COUNT];
+ struct device_link *genpd_link[PM_DOMAIN_COUNT];
};

struct camss_camera_interface {
@@ -99,6 +108,8 @@ int camss_enable_clocks(int nclocks, struct camss_clock *clock,
struct device *dev);
void camss_disable_clocks(int nclocks, struct camss_clock *clock);
int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock);
+int camss_pm_domain_on(struct camss *camss, int id);
+void camss_pm_domain_off(struct camss *camss, int id);
void camss_delete(struct camss *camss);

#endif /* QC_MSM_CAMSS_H */
--
2.7.4
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