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drm/xe/pm: introduce PM PME support

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Introduce PME support for PME capable devices. Whether device is
PME capable is assessed during PCI probe routine. And the whether
PME is enabled for a specific context is assessed during the PM
runtime suspend call if the device is PME capable.

If the PME is enabled, HPDs can generate PME which in turn call
the runtime resume call and do the wakeup routines. Till now
the driver was relying on HPD polling to wakeup in case of any
HPDs. HPD polling can be avoided in platforms with PME support
and instead rely on this PCI PME for HPD induced wakeup.

v2: access functions for xe.pme.enabled status and clear the pme.
    enabled in case of error in xe_pm_runtime_suspend()

v3: use the local pme_enabled flag to clear the device wakeup
    incase of error

v4: call the devm_device_init_wakeup() only if device is PME
    capable to avoid false wakeup capable reporting in platforms
    where PME is not supported.
    Squash the patch which handled the lockdep deadlock handling

Bspec: 52979, 52980, 68857, 68867, 68970
Assisted-by: GitHub_Copilot:claude-opus-5
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patch.msgid.link/20260915092518.639448-2-vinod.govindapillai@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Vinod Govindapillai 2026-09-15 12:25:13 +03:00 • committed by Rodrigo Vivi
commit 41dae8ac5a
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4 changed files with 81 additions and 1 deletions
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