Hi Rajendra, On 6/15/20 3:02 PM, 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> > Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> > Cc: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> > Cc: linux-media@xxxxxxxxxxxxxxx > --- > No functional change in v6, rebased over 5.8-rc1 > Bindings update to add optional PD https://lore.kernel.org/patchwork/patch/1241077/ > > drivers/media/platform/qcom/venus/core.c | 43 +++++++++++++++++--- > drivers/media/platform/qcom/venus/core.h | 5 +++ > drivers/media/platform/qcom/venus/pm_helpers.c | 54 ++++++++++++++++++++++++-- > 3 files changed, 92 insertions(+), 10 deletions(-) > <cut> > > @@ -740,13 +740,16 @@ static int venc_power_v4(struct device *dev, int on) > > static int vcodec_domains_get(struct device *dev) > { > + int ret; > + struct opp_table *opp_table; > + struct device **opp_virt_dev; > struct venus_core *core = dev_get_drvdata(dev); > const struct venus_resources *res = core->res; > struct device *pd; > unsigned int i; > > if (!res->vcodec_pmdomains_num) > - return -ENODEV; > + goto skip_pmdomains; > > for (i = 0; i < res->vcodec_pmdomains_num; i++) { > pd = dev_pm_domain_attach_by_name(dev, > @@ -763,7 +766,41 @@ static int vcodec_domains_get(struct device *dev) > if (!core->pd_dl_venus) > return -ENODEV; > > +skip_pmdomains: > + if (!core->has_opp_table) > + return 0; > + > + /* Attach the power domain for setting performance state */ > + opp_table = dev_pm_opp_attach_genpd(dev, res->opp_pmdomain, &opp_virt_dev); > + if (IS_ERR(opp_table)) { > + ret = PTR_ERR(opp_table); > + goto opp_attach_err; > + } > + > + core->opp_pmdomain = *opp_virt_dev; > + core->opp_dl_venus = device_link_add(dev, core->opp_pmdomain, > + DL_FLAG_RPM_ACTIVE | > + DL_FLAG_PM_RUNTIME | > + DL_FLAG_STATELESS); > + if (!core->opp_dl_venus) { > + ret = -ENODEV; > + goto opp_dl_add_err; > + } > + > return 0; > + > +opp_dl_add_err: > + dev_pm_domain_detach(core->opp_pmdomain, true); > +opp_attach_err: > + if (core->pd_dl_venus) { > + device_link_del(core->pd_dl_venus); > + for (i = 0; i < res->vcodec_pmdomains_num; i++) { > + if (IS_ERR_OR_NULL(core->pmdomains[i])) > + continue; > + dev_pm_domain_detach(core->pmdomains[i], true); > + } > + } > + return ret; > } > > static void vcodec_domains_put(struct device *dev) > @@ -773,7 +810,7 @@ static void vcodec_domains_put(struct device *dev) > unsigned int i; > > if (!res->vcodec_pmdomains_num) > - return; > + goto skip_pmdomains; > > if (core->pd_dl_venus) > device_link_del(core->pd_dl_venus); > @@ -783,6 +820,15 @@ static void vcodec_domains_put(struct device *dev) > continue; > dev_pm_domain_detach(core->pmdomains[i], true); > } > + > +skip_pmdomains: > + if (!res->opp_pmdomain) > + return; > + > + if (core->opp_dl_venus) > + device_link_del(core->opp_dl_venus); > + > + dev_pm_domain_detach(core->opp_pmdomain, true); Without corresponding changes in venus DT node we call pm_domain_detach with core->opp_pmdomain = NULL which triggers NULL pointer dereference. I guess you should check: if (core->has_opp_table) dev_pm_domain_detach(core->opp_pmdomain, true); or if (core->opp_pmdomain) dev_pm_domain_detach(core->opp_pmdomain, true); ... not sure which one is more appropriate or both are. -- regards, Stan
