Public bug reported:
With kernel 4.4, HDMI audio code, e.g. intel_audio.c, cannot build because of
the compiler error of a wrong number of arguments for function pin_eld_notify.
The Ubuntu kernel headers for the kernel 4.4 series have a file,
.../drm/i915_component.h which contains a wrong prototype for function
pin_eld_notify -- an extra argument, "pipe" which should not be present until
the 4.10 kernel headers. The site bootlin shows the header without the extra
argument for the kernels 4.4-4.9, only appearing in the 4.10 kernel code.
https://elixir.bootlin.com/linux/v4.4.121/source/include/drm/i915_component.h
>From i915_comnponent.h
...
struct i915_audio_component_audio_ops {
/**
* @audio_ptr: Pointer to be used in call to pin_eld_notify
*/
void *audio_ptr;
/**
* @pin_eld_notify: Notify the HDA driver that pin sense and/or ELD
information has changed
*
* Called when the i915 driver has set up audio pipeline or has just
* begun to tear it down. This allows the HDA driver to update its
* status accordingly (even when the HDA controller is in power save
* mode).
*/
void (*pin_eld_notify)(void *audio_ptr, int port, int pipe);
/* =====================================================^^^^^^^^^^ BAD CODE
};
Remove the ",int pipe", and the HDMI audio driver code using
intel_audio.c may be built with the 4.4 kernel. This header fix is
needed for the Intel Compute Stick STK1A8LFC running Ubuntu 14.04 when
upgraded to the 4.4 kernel.
** Affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1755309
Title:
i915_component.h has wrong prototype for function pin_eld_notify
causing HDMI audio driver build problems
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