[PATCH v7 0/7] pm_pme support on display hotplug

[Vinod Govindapillai <vinod.govindapillai@intel.com>]

Introduce PME support for PME capable devices and avoid
HPD polling on runtime suspend. For PME capable devices
HPD will trigger PME which will wakeup the system. And
rest of the runtime resume call is same as before.

v2: Instead of plumbing keep_hpd and pme_capability to
    the existing interfaces, a separate helper function to
    set and get pme capability is added.

    HPD polling is handled directly inside the
    intel_hpd_poll_enable() based on the pme capability
    flag

v3: Lockdep related splats were observed during some rare testing
    scenarios. The PCI PME api to enable wake internally use kmalloc
    and can trigger deadlocks. So the calls to the PCI PME APIs are
    updated and placed within the no reclaim loop. Also any display
    specific calls are isolated within xe / i915 blocks and display
    parent interface is used to tackle the inter dependencies to
    keep the display module design clean. 

v4: No need to maintaining another variable to keep track of PME
    can be generated from HPD in intel_hotplug. Instead the parent
    interface function can be used directly to get the xe.pme.enabled
    to know PME is enabled and configure the IRQ resets and HPD polling

v5: Rebased

Vinod Govindapillai (7):
  drm/xe/pm: initialize the device's system wakeup capabilities
  drm/xe/pm: introduce PM PME support
  drm/xe/pm: avoid reclaim when arming PME wakeup
  drm/i915: add pme_enabled() to the parent interface
  drm/i915/xe: plug the pme_enabed implementation for xe
  drm/i915/irq: conditional HPD IRQ resets based on PME capability
  drm/i915/hotplug: avoid HPD polling if the device is PME capable

 .../gpu/drm/i915/display/intel_display_irq.c  | 19 +++++----
 .../gpu/drm/i915/display/intel_display_rpm.c  |  7 ++++
 .../gpu/drm/i915/display/intel_display_rpm.h  |  1 +
 drivers/gpu/drm/i915/display/intel_hotplug.c  |  5 +++
 drivers/gpu/drm/xe/display/xe_display_rpm.c   |  6 +++
 drivers/gpu/drm/xe/xe_device_types.h          | 13 +++++++
 drivers/gpu/drm/xe/xe_pci.c                   | 26 ++++++++++++-
 drivers/gpu/drm/xe/xe_pm.c                    | 39 +++++++++++++++++++
 drivers/gpu/drm/xe/xe_pm.h                    |  2 +
 include/drm/intel/display_parent_interface.h  |  1 +
 10 files changed, 111 insertions(+), 8 deletions(-)

-- 
2.43.0