mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 06:33:07 +00:00
Code Issues Releases Wiki Activity

platform/x86: pmc_atom: Check state of PMC managed devices on s2idle

Browse source 
For the Bay Trail or Cherry Trail SoC to enter the S0i3 power-level
at s2idle suspend requires most of the hw-blocks / devices in the SoC
to be in D3 when entering s2idle suspend.

If some devices are not in D3 then the SoC will stay in a higher
power state, consuming much more power from the battery then in S0i3.

Use the new acpi_s2idle_dev_ops and acpi_register_lps0_dev()
functionality to register a new s2idle check function which checks that
all hardware blocks in the South complex (controlled by the PMC)
are in a state that allows the SoC to enter S0i3 and prints an error
message for any device in D0.

Some blocks are not used on lower-featured versions of the SoC and
these blocks will always report being in D0 on SoCs were they are
not used. A false-positive mask is used to identify these blocks
and for blocks in this mask the error is turned into a debug message
to avoid false-positive error messages.

Note the pmc_atom code is enabled by CONFIG_X86_INTEL_LPSS which
already depends on ACPI.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
[hdegoede: Use acpi_s2idle_dev_ops, ignore fused off blocks, PMIC I2C]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240305105915.76242-4-hdegoede@redhat.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Johannes Stezenbach 2024-03-05 11:59:13 +01:00 committed by Ilpo Järvinen
parent a21ff5a0a7
commit 1bde4afcd1
No known key found for this signature in database
GPG key ID: 59AC4F6153E5CE31
1 changed files with 68 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

68
drivers/platform/x86/pmc_atom.c
View file

@ -6,6 +6,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/dmi.h>
@ -17,6 +18,7 @@
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/seq_file.h>
#include <linux/suspend.h>
struct pmc_bit_map {
const char *name;
@ -448,6 +450,71 @@ static int pmc_setup_clks(struct pci_dev *pdev, void __iomem *pmc_regmap,
return 0;
}
#ifdef CONFIG_SUSPEND
static void pmc_dev_state_check(u32 sts, const struct pmc_bit_map *sts_map,
u32 fd, const struct pmc_bit_map *fd_map,
u32 sts_possible_false_pos)
{
int index;
for (index = 0; sts_map[index].name; index++) {
if (!(fd_map[index].bit_mask & fd) &&
!(sts_map[index].bit_mask & sts)) {
if (sts_map[index].bit_mask & sts_possible_false_pos)
pm_pr_dbg("%s is in D0 prior to s2idle\n",
sts_map[index].name);
else
pr_err("%s is in D0 prior to s2idle\n",
sts_map[index].name);
}
}
}
static void pmc_s2idle_check(void)
{
struct pmc_dev *pmc = &pmc_device;
const struct pmc_reg_map *m = pmc->map;
u32 func_dis, func_dis_2;
u32 d3_sts_0, d3_sts_1;
u32 false_pos_sts_0, false_pos_sts_1;
func_dis = pmc_reg_read(pmc, PMC_FUNC_DIS);
func_dis_2 = pmc_reg_read(pmc, PMC_FUNC_DIS_2);
d3_sts_0 = pmc_reg_read(pmc, PMC_D3_STS_0);
d3_sts_1 = pmc_reg_read(pmc, PMC_D3_STS_1);
/*
* Some blocks are not used on lower-featured versions of the SoC and
* always report D0, add these to false_pos mask to log at debug level.
*/
if (m->d3_sts_1 == byt_d3_sts_1_map) {
/* Bay Trail */
false_pos_sts_0 = BIT_GBE | BIT_SATA | BIT_PCIE_PORT0 |
BIT_PCIE_PORT1 | BIT_PCIE_PORT2 | BIT_PCIE_PORT3 |
BIT_LPSS2_F5_I2C5;
false_pos_sts_1 = BIT_SMB | BIT_USH_SS_PHY | BIT_DFX;
} else {
/* Cherry Trail */
false_pos_sts_0 = BIT_GBE | BIT_SATA | BIT_LPSS2_F7_I2C7;
false_pos_sts_1 = BIT_SMB | BIT_STS_ISH;
}
pmc_dev_state_check(d3_sts_0, m->d3_sts_0, func_dis, m->func_dis, false_pos_sts_0);
pmc_dev_state_check(d3_sts_1, m->d3_sts_1, func_dis_2, m->func_dis_2, false_pos_sts_1);
}
static struct acpi_s2idle_dev_ops pmc_s2idle_ops = {
.check = pmc_s2idle_check,
};
static void pmc_s2idle_check_register(void)
{
acpi_register_lps0_dev(&pmc_s2idle_ops);
}
#else
static void pmc_s2idle_check_register(void) {}
#endif
static int pmc_setup_dev(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct pmc_dev *pmc = &pmc_device;
@ -485,6 +552,7 @@ static int pmc_setup_dev(struct pci_dev *pdev, const struct pci_device_id *ent)
dev_warn(&pdev->dev, "platform clocks register failed: %d\n",
ret);
pmc_s2idle_check_register();
pmc->init = true;
return ret;
}