[PATCH 0/6][SRU][K] Fix No HDMI audio under 5.19.0-35 & -37 (regression from -32)

[Koba Ko]

BugLink: https://bugs.launchpad.net/bugs/2009136

[Impact]
For amdgpu/i915, hdmi audio output device has disappeared.

[Fix]
The latest fix for the non-contiguous memalloc helper changed the
allocation method for a non-IOMMU system to use only the fallback
allocator. This should have worked, but it caused a problem sometimes
when too many non-contiguous pages are allocated that can't be treated
by HD-audio controller.

As a quirk workaround, go back to the original strategy: use
dma_alloc_noncontiguous() at first, and apply the fallback only when
it fails, but only for non-IOMMU case

[Test Case]
1. boot with kernel applied the patches.
2. check the cards in /proc/asound/cards.
   Get the hdmi cards.

 0 [PCH ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xe2320000 irq 137
 1 [HDMI ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xe2260000 irq 134

[Where problems could occur]
Low, this is just workaround and may have a better solution in the future.

[Misc]
All patches has been landed on OEM-6.1 and lunar.


Takashi Iwai (6):
 ALSA: memalloc: Try dma_alloc_noncontiguous() at first
 ALSA: memalloc: Drop special handling of GFP for CONTINUOUS
    allocation
 ALSA: vx: Drop superfluous GFP setup
 ALSA: pdaudiocf: Drop superfluous GFP setup
 ASoC: Intel: sst: Switch to standard device pages
 ALSA: memalloc: Workaround for Xen PV

 include/sound/memalloc.h                     |   3 -
 sound/core/memalloc.c                        | 230 +++++++++++--------
 sound/drivers/vx/vx_pcm.c                    |   3 +-
 sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c       |   3 +-
 sound/soc/intel/atom/sst-mfld-platform-pcm.c |   7 +-
 5 files changed, 142 insertions(+), 104 deletions(-)

-- 
2.25.1