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The current wait_panel_status() uses intel_de_wait(), which internally on Xe platforms calls xe_mmio_wait32(). xe_mmio_wait32() increases poll interval exponentially. This exponential poll interval increase causes unnessory delays during resume or power-on when the panel becomes ready earlier, but polling is delayed due to backoff. Replace intel_de_wait() with read_poll_timeout() + intel_de_read() to actively poll the register at a fixed 10ms interval up to a 5 second timeout. This allows poll to exit early when panel is ready. Changes in v2: Replaced two-phase intel_de_wait() with read_poll_timeout() + intel_de_read() Changes in v3: - Add poll_interval_ms argument 'wait_panel_status' function. - Modify 'wait_panel_status' callers with proper poll interval Changes in v4: - Change 'wait_panel_off' poll interval to 10ms Changes in v5: - Dropped poll_interval_ms parameter,use fixed polling interval of 10ms (Jani Nikula) Changes in v6: - Removed goto in error path Signed-off-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com> Link: https://lore.kernel.org/r/20250807082402.79018-1-dibin.moolakadan.subrahmanian@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com> |
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| init | ||
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| ipc | ||
| kernel | ||
| lib | ||
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| .cocciconfig | ||
| .editorconfig | ||
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| .gitattributes | ||
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| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.