| Message ID | 20220205185429.2278860-28-paul.kocialkowski@bootlin.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Allwinner A31/A83T MIPI CSI-2 Support and A31 ISP Support | expand |
Hi Paul, Thanks for the update. On Sat, Feb 05, 2022 at 07:53:50PM +0100, Paul Kocialkowski wrote: > In order to keep the power use count fields balanced when link changes > happen between v4l2_pipeline_pm_get/set calls (in open/close), > the link_notify media operation callback needs to be registered. > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> > --- > drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > index 6f04f86504bf..c8fe31cc38b5 100644 > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > @@ -23,6 +23,7 @@ > #include <linux/sched.h> > #include <linux/sizes.h> > #include <linux/slab.h> > +#include <media/v4l2-mc.h> > > #include "sun6i_csi.h" > #include "sun6i_csi_reg.h" > @@ -574,6 +575,12 @@ void sun6i_csi_set_stream(struct sun6i_csi_device *csi_dev, bool enable) > CSI_CAP_CH0_VCAP_ON); > } > > +/* Media */ > + > +static const struct media_device_ops sun6i_csi_media_ops = { > + .link_notify = v4l2_pipeline_link_notify, Do you really need this? Drivers should instead rely on runtime PM nowadays. <URL:https://hverkuil.home.xs4all.nl/spec/driver-api/camera-sensor.html#power-management> > +}; > + > /* V4L2 */ > > static int sun6i_csi_link_entity(struct sun6i_csi_device *csi_dev, > @@ -683,6 +690,7 @@ static int sun6i_csi_v4l2_setup(struct sun6i_csi_device *csi_dev) > snprintf(media_dev->bus_info, sizeof(media_dev->bus_info), > "platform:%s", dev_name(dev)); > media_dev->hw_revision = 0; > + media_dev->ops = &sun6i_csi_media_ops; > media_dev->dev = dev; > > media_device_init(media_dev);
Hi Sakari, On Mon 14 Feb 22, 18:40, Sakari Ailus wrote: > Hi Paul, > > Thanks for the update. > > On Sat, Feb 05, 2022 at 07:53:50PM +0100, Paul Kocialkowski wrote: > > In order to keep the power use count fields balanced when link changes > > happen between v4l2_pipeline_pm_get/set calls (in open/close), > > the link_notify media operation callback needs to be registered. > > > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> > > --- > > drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > > index 6f04f86504bf..c8fe31cc38b5 100644 > > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > > @@ -23,6 +23,7 @@ > > #include <linux/sched.h> > > #include <linux/sizes.h> > > #include <linux/slab.h> > > +#include <media/v4l2-mc.h> > > > > #include "sun6i_csi.h" > > #include "sun6i_csi_reg.h" > > @@ -574,6 +575,12 @@ void sun6i_csi_set_stream(struct sun6i_csi_device *csi_dev, bool enable) > > CSI_CAP_CH0_VCAP_ON); > > } > > > > +/* Media */ > > + > > +static const struct media_device_ops sun6i_csi_media_ops = { > > + .link_notify = v4l2_pipeline_link_notify, > > Do you really need this? > > Drivers should instead rely on runtime PM nowadays. > > <URL:https://hverkuil.home.xs4all.nl/spec/driver-api/camera-sensor.html#power-management> See my remark on the patch adding support for runtime pm. My understanding is that the callback is required when v4l2_pipeline_pm_get/set is used, to keep the use count balanced (as mentionned in this commit message): <https://hverkuil.home.xs4all.nl/spec/driver-api/v4l2-mc.html#c.v4l2_pipeline_pm_get> Cheers, Paul > > +}; > > + > > /* V4L2 */ > > > > static int sun6i_csi_link_entity(struct sun6i_csi_device *csi_dev, > > @@ -683,6 +690,7 @@ static int sun6i_csi_v4l2_setup(struct sun6i_csi_device *csi_dev) > > snprintf(media_dev->bus_info, sizeof(media_dev->bus_info), > > "platform:%s", dev_name(dev)); > > media_dev->hw_revision = 0; > > + media_dev->ops = &sun6i_csi_media_ops; > > media_dev->dev = dev; > > > > media_device_init(media_dev); > > -- > Kind regards, > > Sakari Ailus
diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c index 6f04f86504bf..c8fe31cc38b5 100644 --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c @@ -23,6 +23,7 @@ #include <linux/sched.h> #include <linux/sizes.h> #include <linux/slab.h> +#include <media/v4l2-mc.h> #include "sun6i_csi.h" #include "sun6i_csi_reg.h" @@ -574,6 +575,12 @@ void sun6i_csi_set_stream(struct sun6i_csi_device *csi_dev, bool enable) CSI_CAP_CH0_VCAP_ON); } +/* Media */ + +static const struct media_device_ops sun6i_csi_media_ops = { + .link_notify = v4l2_pipeline_link_notify, +}; + /* V4L2 */ static int sun6i_csi_link_entity(struct sun6i_csi_device *csi_dev, @@ -683,6 +690,7 @@ static int sun6i_csi_v4l2_setup(struct sun6i_csi_device *csi_dev) snprintf(media_dev->bus_info, sizeof(media_dev->bus_info), "platform:%s", dev_name(dev)); media_dev->hw_revision = 0; + media_dev->ops = &sun6i_csi_media_ops; media_dev->dev = dev; media_device_init(media_dev);
In order to keep the power use count fields balanced when link changes happen between v4l2_pipeline_pm_get/set calls (in open/close), the link_notify media operation callback needs to be registered. Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> --- drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 8 ++++++++ 1 file changed, 8 insertions(+)