Re: [PATCH 0/4] ALSA: isa/gus: add ISA PM support for GUS Classic, GUS Extreme and GUS MAX

["Cássio Gabriel Monteiro Pires" <cassiogabrielcontato@gmail.com>]

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On 4/6/26 06:11, Takashi Iwai wrote:
> On Mon, 06 Apr 2026 05:20:02 +0200,
> Cássio Gabriel wrote:
>>
>> gusclassic, gusextreme and gusmax still leave their ISA PM callbacks
>> disabled, so a suspend/resume cycle does not restore usable GF1 operation
>> on these cards.
>>
>> A simple wrapper around the existing GF1 start/stop paths is not enough.
>> Those helpers are probe and shutdown paths: they reset software handlers
>> and tear down runtime state such as the DRAM allocator, timer state, DMA
>> queues, PCM state and UART setup. Resume instead needs a narrower recovery
>> path that rebuilds the GF1 hardware state without rerunning probe-only
>> detection or discarding the bookkeeping kept by the card instance.
>>
>> gusextreme and gusmax also need board-specific resume glue around that
>> shared GF1 recovery path. GUS Extreme has to restore the ES1688-side GF1
>> routing before the GF1 is touched again. GUS MAX has to rewrite the MAX
>> control register and restore the attached WSS codec state before the full
>> card is brought back.
>>
>> This series does that in four steps:
>>
>> - add shared GF1 suspend/resume helpers that quiesce PCM, DMA and UART
>>   activity and restart the GF1 hardware without rerunning memory detection
>>   or allocator initialization
>> - wire gusclassic up to the shared helpers
>> - wire gusextreme up as well, restoring the ES1688-side GF1 routing
>>   before the shared resume path runs
>> - wire gusmax up too, restoring the MAX control register and the WSS codec
>>   state around the shared GF1 resume path
>>
>> The scope is limited to restoring post-resume usability for these ISA
>> cards. It does not attempt transparent continuation of active GF1 PCM or
>> synth state across suspend, and userspace may still need to reprepare
>> streams or reload onboard sample data after resume. Open rawmidi
>> substreams are restored only to a usable post-resume state.
>>
>> Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
> 
> Applied all four patches to for-next branch.

Awesome, thank you very much.



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