platform/x86: intel_pmc_core: Add debugfs support to access live status registers

Just like status registers, Tiger Lake has another set of 6 registers
that help with status of the low power mode requirements. They are
latched on every PC10 entry/exit and S0ix.y entry/exit as well.

Though status and live status registers show the status of same list
of requirements, live status registers show the status of the low power
mode requirements at the time of reading.

Cc: Srinivas Pandruvada <srinivas.pandruvada@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David E. 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 fe5fddc808c42adf9debc0f1f6cc0b6044cf8df0..f4a36fbabf4c56ce3e1d5a7b9b6318d5e176e53f 100644 (file)
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -570,6 +570,7 @@ static const struct pmc_reg_map tgl_reg_map = {
        .lpm_residency_offset = TGL_LPM_RESIDENCY_OFFSET,
        .lpm_sts = tgl_lpm_maps,
        .lpm_status_offset = TGL_LPM_STATUS_OFFSET,
+       .lpm_live_status_offset = TGL_LPM_LIVE_STATUS_OFFSET,
 };
 
 static inline u32 pmc_core_reg_read(struct pmc_dev *pmcdev, int reg_offset)
@@ -1019,6 +1020,18 @@ static int pmc_core_substate_sts_regs_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_sts_regs);
 
+static int pmc_core_substate_l_sts_regs_show(struct seq_file *s, void *unused)
+{
+       struct pmc_dev *pmcdev = s->private;
+       const struct pmc_bit_map **maps = pmcdev->map->lpm_sts;
+       u32 offset = pmcdev->map->lpm_live_status_offset;
+
+       pmc_core_lpm_display(pmcdev, NULL, s, offset, "LIVE_STATUS", maps);
+
+       return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
+
 static int pmc_core_pkgc_show(struct seq_file *s, void *unused)
 {
        struct pmc_dev *pmcdev = s->private;
@@ -1096,6 +1109,12 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
                                    pmcdev->dbgfs_dir, pmcdev,
                                    &pmc_core_substate_sts_regs_fops);
        }
+
+       if (pmcdev->map->lpm_status_offset) {
+               debugfs_create_file("substate_live_status_registers", 0444,
+                                   pmcdev->dbgfs_dir, pmcdev,
+                                   &pmc_core_substate_l_sts_regs_fops);
+       }
 }
 #else
 static inline void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)

diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h
index 3fdf4735c56f60428896644331cfae47bc7c756b..1bbdffe80bde32c0ab78dfff7c453b0e8b10aed1 100644 (file)
--- a/drivers/platform/x86/intel_pmc_core.h
+++ b/drivers/platform/x86/intel_pmc_core.h
@@ -196,6 +196,7 @@ enum ppfear_regs {
 
 /* Tigerlake Low Power Mode debug registers */
 #define TGL_LPM_STATUS_OFFSET                  0x1C3C
+#define TGL_LPM_LIVE_STATUS_OFFSET             0x1C5C
 
 const char *lpm_modes[] = {
        "S0i2.0",
@@ -257,6 +258,7 @@ struct pmc_reg_map {
        const u32 lpm_en_offset;
        const u32 lpm_residency_offset;
        const u32 lpm_status_offset;
+       const u32 lpm_live_status_offset;
 };
 
 /**