lib/igt_pm: igt lib helper routines to support DC5/6 tests

This patch does the following changes to lib/igt_pm.c

-dmc_loaded() will be used by new test i915_pm_dc.c which will validate
 Display C States. So moving the same to igt_pm library.

-Introduced igt_disable_runtime_pm() in order to disable runtime suspend
 for the function which support dc9.

-Changed the igt_pm_enable_sata_link_power_management() and
 igt_pm_restore_sata_link_power_management() in order to save
 and restore the sata link power policy by an exit handler.

v2: Simplify the comment section.
v3: Remove . from the subject line.
v4: Rebased, resolve conflicts in pm_rpm.c
    Included patch set version change log.
v5: Listing actual change in patch set changelog to make review easier.
v6: igt's lib added support for disabling runtime suspend,
    change in commit log. rebased due to test name pm_rpm changed
    to i915_pm_rpm.
v7: Addressed review comment by saving POWER_DIR values in
    igt_disable_runtime_pm(). [Imre]
v8: Addressed the review comment, igt_pm_enable_sata_link_power_management
    function to restore the original SATA link power policy if things fail
    by using an exit handler. [Imre]
v9: IGT failure fixture in i915_pm_backlight and i915_pm_rpm.
v10:Review comment fixup in sata_link_power_management
    lib functions. [Imre]
v11:Add igt_assert_fd(pm_status_fd) in igt_disable_runtime_pm().
    [Imre & Petri]
v12: Refactor igt_pm_pc8_plus_residencies_enabled() from
     supports_pc8_plus_residencies().
     Changed igt_disable_runtime_pm() return type. [Imre]

Signed-off-by: Jyoti Yadav <jyoti.r.yadav@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/igt_pm.h b/lib/igt_pm.h
index 10cc6794..7dc24174 100644
--- a/lib/igt_pm.h
+++ b/lib/igt_pm.h
@@ -25,8 +25,8 @@
 #define IGT_PM_H
 
 void igt_pm_enable_audio_runtime_pm(void);
-int8_t *igt_pm_enable_sata_link_power_management(void);
-void igt_pm_restore_sata_link_power_management(int8_t *pm_data);
+void igt_pm_enable_sata_link_power_management(void);
+void igt_pm_restore_sata_link_power_management(void);
 
 /**
  * igt_runtime_pm_status:
@@ -47,8 +47,11 @@ enum igt_runtime_pm_status {
 };
 
 bool igt_setup_runtime_pm(void);
+void igt_disable_runtime_pm(void);
 void igt_restore_runtime_pm(void);
 enum igt_runtime_pm_status igt_get_runtime_pm_status(void);
 bool igt_wait_for_pm_status(enum igt_runtime_pm_status status);
+bool igt_pm_dmc_loaded(int debugfs);
+bool igt_pm_pc8_plus_residencies_enabled(int msr_fd);
 
 #endif /* IGT_PM_H */