Re: [PATCH v3 12/17] media: venus: core: Add support for opp tables/perf voting

[Rajendra Nayak]

On 4/29/2020 6:09 AM, Matthias Kaehlcke wrote:
> On Tue, Apr 28, 2020 at 07:03:00PM +0530, Rajendra Nayak wrote:
> > Add support to add OPP tables and perf voting on the OPP powerdomain.
> > This is needed so venus votes on the corresponding performance state
> > for the OPP powerdomain along with setting the core clock rate.
> >
> > Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
> > Cc: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx>
> > Cc: linux-media@xxxxxxxxxxxxxxx
> > ---
> >   drivers/media/platform/qcom/venus/core.c       | 28 +++++++++++++++++++
> >   drivers/media/platform/qcom/venus/core.h       |  5 ++++
> >   drivers/media/platform/qcom/venus/pm_helpers.c | 37 +++++++++++++++++++++++---
> >   3 files changed, 66 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> > index 194b10b9..e98fea92 100644
> > --- a/drivers/media/platform/qcom/venus/core.c
> > +++ b/drivers/media/platform/qcom/venus/core.c
> > @@ -12,6 +12,7 @@
> >   #include <linux/platform_device.h>
> >   #include <linux/slab.h>
> >   #include <linux/types.h>
> > +#include <linux/pm_opp.h>
> >   #include <linux/pm_runtime.h>
> >   #include <media/videobuf2-v4l2.h>
> >   #include <media/v4l2-mem2mem.h>
> > @@ -214,6 +215,20 @@ static int venus_probe(struct platform_device *pdev)
> >   	if (!core->pm_ops)
> >   		return -ENODEV;
> >   
> > +	core->opp_table = dev_pm_opp_set_clkname(dev, "core");
> > +	if (IS_ERR(core->opp_table))
> > +		return PTR_ERR(core->opp_table);
> > +
> > +	if (core->res->opp_pmdomain) {
> > +		ret = dev_pm_opp_of_add_table(dev);
> > +		if (!ret) {
> > +			core->has_opp_table = true;
> > +		} else if (ret != -ENODEV) {
> > +			dev_err(dev, "Invalid OPP table in Device tree\n");
> > +			return ret;
> > +		}
> > +	}
> > +
> >   	if (core->pm_ops->core_get) {
> >   		ret = core->pm_ops->core_get(dev);
> >   		if (ret)
> > @@ -301,6 +316,9 @@ static int venus_probe(struct platform_device *pdev)
> >   err_venus_shutdown:
> >   	venus_shutdown(core);
> >   err_runtime_disable:
> > +	if (core->res->opp_pmdomain && core->has_opp_table)
>
> the check for 'core->res->opp_pmdomain' is not needed, 'core->has_opp_table'
> can only be true when 'core->res->opp_pmdomain' is not NULL.

ah, that's right, will fix. Thanks.

> > +		dev_pm_opp_of_remove_table(dev);
> > +	dev_pm_opp_put_clkname(core->opp_table);
> >   	pm_runtime_set_suspended(dev);
> >   	pm_runtime_disable(dev);
> >   	hfi_destroy(core);
> > @@ -326,6 +344,10 @@ static int venus_remove(struct platform_device *pdev)
> >   
> >   	venus_firmware_deinit(core);
> >   
> > +	if (core->res->opp_pmdomain && core->has_opp_table)
>
> ditto

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