Hello,
On Thursday, May 10, 2012 11:09 AM Kukjin Kim wrote:
> Marek Szyprowski wrote:
> >
> > Some bootloaders disable unused power domains, so kernel code should
> > read the actual state from the hardware registers instead of assuming
> > that their initial state is 'on'.
> >
> > Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
> > Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
> > ---
> > arch/arm/mach-exynos/pm_domains.c | 9 ++++++---
> > 1 files changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-
> > exynos/pm_domains.c
> > index 13b3068..26fc47d 100644
> > --- a/arch/arm/mach-exynos/pm_domains.c
> > +++ b/arch/arm/mach-exynos/pm_domains.c
> > @@ -151,9 +151,12 @@ static __init int exynos4_pm_init_power_domain(void)
> > if (of_have_populated_dt())
> > return exynos_pm_dt_parse_domains();
> >
> > - for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++)
> > - pm_genpd_init(&exynos4_pm_domains[idx]->pd, NULL,
> > - exynos4_pm_domains[idx]->is_off);
> > + for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++) {
> > + struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
> > + int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
> > +
> > + pm_genpd_init(&pd->pd, NULL, !on);
> > + }
> >
> > #ifdef CONFIG_S5P_DEV_FIMD0
> > exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
> > --
> > 1.7.1.569.g6f426
>
> As you said, if bootloader changed some hardware setting which is not
> expected value in kernel, it should be notified to kernel. But for
> pm_domaine->is_off, it should be via DT on EXYNOS now. As you know, the
> functionality has been already implemented on dt.
I really doubt that we need such complex interface to pass the information
which the driver can simply read from the register...
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
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