Hello Peter,
On Wed, Dec 11, 2024 at 02:53:34PM -0500, Peter Geis wrote:
> On Wed, Dec 11, 2024 at 9:32 AM Sebastian Reichel
> <sebastian.reichel@xxxxxxxxxxxxx> wrote:
> >
> > Currently rockchip_do_pmu_set_power_domain prints a warning if there
> > have been errors turning on the power domain, but it does not return
> > any errors and rockchip_pd_power() tries to continue setting up the
> > QOS registers. This usually results in accessing unpowered registers,
> > which triggers an SError and a full system hang.
> >
> > This improves the error handling by forwarding the error to avoid
> > kernel panics.
>
> I think we should merge your patch here with my patch for returning
> errors from rockchip_pmu_set_idle_request [1].
I will have a look.
> > Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>
> > Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
> > Tested-by: Adrian Larumbe <adrian.larumbe@xxxxxxxxxxxxx> # On Rock 5B
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
> > ---
> > drivers/pmdomain/rockchip/pm-domains.c | 34 +++++++++++++++++---------
> > 1 file changed, 22 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c
> > index a161ee13c633..8f440f2883db 100644
> > --- a/drivers/pmdomain/rockchip/pm-domains.c
> > +++ b/drivers/pmdomain/rockchip/pm-domains.c
> > @@ -533,16 +533,17 @@ static int rockchip_pmu_domain_mem_reset(struct rockchip_pm_domain *pd)
> > return ret;
> > }
> >
> > -static void rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd,
> > - bool on)
> > +static int rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd,
> > + bool on)
> > {
> > struct rockchip_pmu *pmu = pd->pmu;
> > struct generic_pm_domain *genpd = &pd->genpd;
> > u32 pd_pwr_offset = pd->info->pwr_offset;
> > bool is_on, is_mem_on = false;
> > + int ret;
> >
> > if (pd->info->pwr_mask == 0)
> > - return;
> > + return 0;
> >
> > if (on && pd->info->mem_status_mask)
> > is_mem_on = rockchip_pmu_domain_is_mem_on(pd);
> > @@ -557,16 +558,21 @@ static void rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd,
> >
> > wmb();
> >
> > - if (is_mem_on && rockchip_pmu_domain_mem_reset(pd))
> > - return;
> > + if (is_mem_on) {
> > + ret = rockchip_pmu_domain_mem_reset(pd);
> > + if (ret)
> > + return ret;
> > + }
> >
> > - if (readx_poll_timeout_atomic(rockchip_pmu_domain_is_on, pd, is_on,
> > - is_on == on, 0, 10000)) {
> > - dev_err(pmu->dev,
> > - "failed to set domain '%s', val=%d\n",
> > - genpd->name, is_on);
> > - return;
> > + ret = readx_poll_timeout_atomic(rockchip_pmu_domain_is_on, pd, is_on,
> > + is_on == on, 0, 10000);
> > + if (ret) {
> > + dev_err(pmu->dev, "failed to set domain '%s' %s, val=%d\n",
> > + genpd->name, on ? "on" : "off", is_on);
> > + return ret;
> > }
> > +
> > + return 0;
> > }
> >
> > static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
> > @@ -592,7 +598,11 @@ static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
> > rockchip_pmu_set_idle_request(pd, true);
> > }
> >
> > - rockchip_do_pmu_set_power_domain(pd, power_on);
> > + ret = rockchip_do_pmu_set_power_domain(pd, power_on);
> > + if (ret < 0) {
> > + clk_bulk_disable(pd->num_clks, pd->clks);
> > + return ret;
>
> Looking at it, we shouldn't return directly from here because the
> mutex never gets unlocked.
Yes, we should do that after patch 2/7 from this series :)
> Instead of repeating clk_bulk_disable and return ret for each failure,
> we can initialize ret = 0, have a goto: out pointing to
> clk_bulk_disable, and change return 0 to return ret at the end.
Right now there is only a single clk_bulk_disable() in an error
case, so I did not use the typical error goto chain. I suppose
it makes a lot more sense with proper error handling for the calls
to rockchip_pmu_set_idle_request().
Greetings,
-- Sebastian
>
> What do you think?
>
> Very Respectfully,
> Peter Geis
>
> [1] https://lore.kernel.org/linux-rockchip/20241210013010.81257-2-pgwipeout@xxxxxxxxx/
>
> > + }
> >
> > if (power_on) {
> > /* if powering up, leave idle mode */
> > --
> > 2.45.2
> >
> >
> > _______________________________________________
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> > Linux-rockchip@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip
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