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Subject[PATCH v2 6/7] platform/x86: intel_pmc_core: Dump low power status registers on an S0ix.y failure
Platforms prior to Tiger Lake has no sub-states of S0ix and accessing
device PM states that are latched whenever there is a PC10 entry is
possible with the help of slp_s0_debug_status and slp_s0_dbg_latch
debugfs entries.

If a platform has sub-states of S0ix, no such entries are created.
Hence, dump low power status registers on resume When any attempt to
enter any low power state was unsuccessful.

Cc: Srinivas Pandruvada <>
Cc: Andy Shevchenko <>
Cc: David Box <>
Suggested-by: David Box <>
Signed-off-by: Gayatri Kammela <>
drivers/platform/x86/intel_pmc_core.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index 41426d4af887..62cce906755e 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -1284,6 +1284,8 @@ static inline bool pmc_core_is_s0ix_failed(struct pmc_dev *pmcdev)
static int pmc_core_resume(struct device *dev)
struct pmc_dev *pmcdev = dev_get_drvdata(dev);
+ const struct pmc_bit_map **maps = pmcdev->map->lpm_sts;
+ int offset = pmcdev->map->lpm_status_offset;

if (!pmcdev->check_counters)
return 0;
@@ -1303,6 +1305,8 @@ static int pmc_core_resume(struct device *dev)
if (pmcdev->map->slps0_dbg_maps)
pmc_core_slps0_display(pmcdev, dev, NULL);
+ if (pmcdev->map->lpm_sts)
+ pmc_core_lpm_display(pmcdev, dev, NULL, "STATUS", offset, maps);

return 0;
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