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SubjectRe: [PATCH v3 18/35] media: camss: Add basic runtime PM support
Hi Todor,

On Wed, Jul 25, 2018 at 01:01:31PM +0300, Todor Tomov wrote:
> Hi Sakari,
>
> Thank you for review.
>
> On 24.07.2018 15:49, Sakari Ailus wrote:
> > Hi Todor,
> >
> > On Mon, Jul 23, 2018 at 02:02:35PM +0300, Todor Tomov wrote:
> >> 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);
> >
> > Shouldn't the regulator be enabled in the runtime_resume callback instead?
>
> Ideally - yes, but it becomes more complex (different pipelines are possible
> and we have only one callback) so (at least for now) I have left it as it is
> and stated in the commit message that suspend/resume is still not supported.

Ack.

--
Sakari Ailus
sakari.ailus@linux.intel.com

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