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. 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 | 40 +++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/x86/platform/atom/punit_atom_debug.c b/arch/x86/platform/atom/punit_atom_debug.c index f8ed5f66cd20..efa4b188300d 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> @@ -102,10 +105,12 @@ static int punit_dev_state_show(struct seq_file *seq_file, void *unused) } DEFINE_SHOW_ATTRIBUTE(punit_dev_state); +static const struct punit_device *punit_dev; static struct dentry *punit_dbg_file; static void punit_dbgfs_register(struct punit_device *punit_device) { + punit_dev = punit_device; punit_dbg_file = debugfs_create_dir("punit_atom", NULL); debugfs_create_file("dev_power_state", 0444, punit_dbg_file, @@ -117,6 +122,35 @@ static void punit_dbgfs_unregister(void) debugfs_remove_recursive(punit_dbg_file); } +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) +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 */ + 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) @@ -138,12 +172,18 @@ static int __init punit_atom_debug_init(void) return -ENODEV; punit_dbgfs_register((struct punit_device *)id->driver_data); +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND) + 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 punit_dbgfs_unregister(); } -- 2.43.0
