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 <srinivas.pandruvada@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Box <david.e.box@intel.com>
Suggested-by: David Box <david.e.box@intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index bddde30..fe5fddc 100644 (file)
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -1285,6 +1285,8 @@ 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;
@@ -1304,6 +1306,8 @@ static int pmc_core_resume(struct device *dev)
                 pmcdev->s0ix_counter);
        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, offset, "STATUS", maps);
 
        return 0;
 }