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It has been observed that during `xe_display_pm_suspend()` execution, an HPD interrupt can still be triggered, resulting in `dig_port_work` being scheduled. The issue arises when this work executes after `xe_display_pm_suspend_late()`, by which time the display is fully suspended. This can lead to errors such as "DC state mismatch", as the dig_port work accesses display resources that are no longer available or powered. To address this, introduce 'intel_encoder_block_all_hpds' and 'intel_encoder_unblock_all_hpds' functions, which iterate over all encoders and block/unblock HPD respectively. These are used to: - Block HPD IRQs before calling 'intel_hpd_cancel_work' in suspend and shutdown - Unblock HPD IRQs after 'intel_hpd_init' in resume This will prevent 'dig_port_work' being scheduled during display suspend. Continuation of previous patch discussion: https://patchwork.freedesktop.org/patch/663964/ Changes in v2: - Add 'intel_encoder_block_all_hpds' to 'xe_display_pm_shutdown'.(Imre Deak) - Add 'intel_hpd_cancel_work' to 'xe_display_fini_early' to cancel any HPD pending work at late driver removal. (Imre Deak) Changes in v3: - Move 'intel_encoder_block_all_hpds' after intel_dp_mst_suspend in 'xe_display_pm_shutdown'.(Imre Deak) Signed-off-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://lore.kernel.org/r/20250724083928.2298199-1-dibin.moolakadan.subrahmanian@intel.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.