On Thu 18 Nov 04:45 CST 2021, Stephan Gerhold wrote:
> On Wed, Nov 17, 2021 at 07:00:58PM -0600, Bjorn Andersson wrote:
> > On Mon 18 Oct 06:08 CDT 2021, Stephan Gerhold wrote:
> >
> > > Not all RPM firmware versions have the dynamic sleep stats offset
> > > available. Older versions use a fixed offset of 0xdba0.
> > >
> > > Add support for this using a new qcom,rpm-legacy-stats compatible
> > > that can be used for older SoCs like MSM8916.
> > >
> > > Suggested-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
> > > Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
> > > ---
> > > drivers/soc/qcom/qcom_stats.c | 10 ++++++++++
> > > 1 file changed, 10 insertions(+)
> > >
> > > diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c
> > > index 817505bd99b5..67728de718fd 100644
> > > --- a/drivers/soc/qcom/qcom_stats.c
> > > +++ b/drivers/soc/qcom/qcom_stats.c
> > > @@ -237,6 +237,15 @@ static const struct stats_config rpm_data = {
> > > .subsystem_stats_in_smem = false,
> > > };
> > >
> > > +/* Older RPM firmwares have the stats at a fixed offset instead */
> > > +static const struct stats_config rpm_legacy_data = {
> > > + .stats_offset = 0xdba0,
> > > + .num_records = 2,
> > > + .appended_stats_avail = true,
> > > + .dynamic_offset = false,
> > > + .subsystem_stats_in_smem = false,
> > > +};
> >
> > Is this the only variation that existed back in the "legacy" days? Will
> > we end up with multiple "legacy" variants?
> >
>
> I think most old platforms that are still somewhat maintained use 0xdba0
> (e.g. MSM8916, MSM8974, APQ8084, MSM8226).
> I found a different offset for APQ8064, MSM8960, but they also seem to
> use a different stats format ("v1" instead of "v2") which is not
> currently supported by the qcom_stats driver here.
>
Okay, so there's an even more legacy format as well...
> I guess I could add SoC-specific compatibles if you prefer (e.g.
> "qcom,rpm-stats-msm8916"), or do you have any other suggestion?
>
Yes, as we have examples of another "legacy format" I would prefer that
we sprinkle some platform names in there; and as newer platforms all
seems to use the same format this effort should be bound to whatever old
platforms we end up supporting.
Nit. I would prefer the qcom,msm8916-rpm-stats format though.
Regards,
Bjorn
