On Sun, 7 Jan 2024, Hans de Goede wrote: > From: Johannes Stezenbach <js@xxxxxxxxx> > > This is a port of "pm: Add pm suspend debug notifier for North IPs" > from the latte-l-oss branch of: > from https://github.com/MiCode/Xiaomi_Kernel_OpenSource latte-l-oss > > With the new acpi_s2idle_dev_ops and acpi_register_lps0_dev() > functionality this can now finally be ported to the mainline kernel > without requiring adding non-upstreamable hooks into the cpu_idle > driver mechanism. Same problems with the commit message as in one of the earlier patches. > This adds a check that all hardware blocks in the North complex > (controlled by Punit) are in a state that allows the SoC to enter S0i3 > and prints an error message for any device in D0. > > Signed-off-by: Johannes Stezenbach <js@xxxxxxxxx> > Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> > [hdegoede: Use acpi_s2idle_dev_ops] > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > arch/x86/platform/atom/punit_atom_debug.c | 45 ++++++++++++++++++++++- > 1 file changed, 44 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/platform/atom/punit_atom_debug.c b/arch/x86/platform/atom/punit_atom_debug.c > index f8ed5f66cd20..03ae08c99155 100644 > --- a/arch/x86/platform/atom/punit_atom_debug.c > +++ b/arch/x86/platform/atom/punit_atom_debug.c > @@ -7,6 +7,9 @@ > * Copyright (c) 2015, Intel Corporation. > */ > > +#define pr_fmt(fmt) "punit_atom: " fmt > + > +#include <linux/acpi.h> > #include <linux/module.h> > #include <linux/init.h> > #include <linux/device.h> > @@ -117,6 +120,37 @@ static void punit_dbgfs_unregister(void) > debugfs_remove_recursive(punit_dbg_file); > } > > +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) > +static const struct punit_device *punit_dev; > + > +static void punit_s2idle_check(void) > +{ > + const struct punit_device *punit_devp; > + u32 punit_pwr_status, dstate; > + int status; > + > + for (punit_devp = punit_dev; punit_devp->name; punit_devp++) { > + /* Skip MIO this is on till the very last moment */ Skip MIO, it is on ... > + if (punit_devp->reg == MIO_SS_PM) > + continue; > + > + status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, > + punit_devp->reg, &punit_pwr_status); > + if (status) { > + pr_err("%s read failed\n", punit_devp->name); > + } else { > + dstate = (punit_pwr_status >> punit_devp->sss_pos) & 3; > + if (!dstate) > + pr_err("%s is in D0 prior to s2idle\n", punit_devp->name); > + } > + } > +} > + > +static struct acpi_s2idle_dev_ops punit_s2idle_ops = { > + .check = punit_s2idle_check, > +}; > +#endif > + > #define X86_MATCH(model, data) \ > X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \ > X86_FEATURE_MWAIT, data) > @@ -131,19 +165,28 @@ MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids); > > static int __init punit_atom_debug_init(void) > { > + struct punit_device *punit_device; > const struct x86_cpu_id *id; > > id = x86_match_cpu(intel_punit_cpu_ids); > if (!id) > return -ENODEV; > > - punit_dbgfs_register((struct punit_device *)id->driver_data); > + punit_device = (struct punit_device *)id->driver_data; > + punit_dbgfs_register(punit_device); > +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) > + punit_dev = punit_device; > + acpi_register_lps0_dev(&punit_s2idle_ops); > +#endif > > return 0; > } > > static void __exit punit_atom_debug_exit(void) > { > +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) > + acpi_unregister_lps0_dev(&punit_s2idle_ops); > +#endif I'd move these into new functions in the existing #if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) block and add #else block which has dummy functions for them. > punit_dbgfs_unregister(); > } > > -- i.
