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The only real reason why we have the gen2 vs. gen3+ split in irq handling is that bspec claims that IIR/IMR/IER/ISR and EMR are only 16 bits on gen2, as opposed to being 32 bits on gen3+. That doesn't seem to be a meaningful distinction as 32bit access to these registers works perfectly fine on gen2 Interestingly the 16 msbs of IMR are in fact hardcoded to 1 on gen2, which to me indicates that 32bit access was the plan all along, and perhaps someone just forgot to update the spec. Nuke the special 16bit gen2 irq code and switch over to the gen3 code. Gen2 doesn't have the ASLE interrupt, which just needs a small tweak in i915_irq_postinstall(). And so far we've not had a codepath that could enable the legacy BLC interrupt on gen2. Now we do, but we'll never actually do it since gen2 machines don't have OpRegion. (and neither do i915/i945 machines btw). On these older platforms the legacy BLC interrupt is meant to be used in conjunction with the LBPC backlight stuff, but we never actually switch off the legacy/combination mode and thus don't use the interrupt either. This was quickly smoke tested on all gen2 variants. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240927143545.8665-5-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula <jani.nikula@intel.com>
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.