Re: [PATCH] ALSA: hda: intel: Don't free interrupt when suspending

[Heiner Kallweit <hkallweit1@gmail.com>]

On 01.11.2024 09:21, Takashi Iwai wrote:
> On Thu, 31 Oct 2024 20:32:52 +0100,
> Heiner Kallweit wrote:
>>
>> There's no need to free/re-request the interrupt on system suspend.
>> PCI core takes care, using functions like pci_restore_msi_state().
> 
> Well, it wasn't always true for hibernation in the past,
> e.g. snd-intel8x0 driver had to deal with it.  I guess it's no longer
> needed for modern platforms for HD-audio, so I'm going to take this
> for 6.13.
> 
Interesting, do you have any link to what the issue with intel8x0 was?
In the commit history I didn't find something related at a first glance.
Maybe also PCI core simply is more mature meanwhile.

Heiner
> 
> thanks,
> 
> Takashi
> 
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>> ---
>>  sound/pci/hda/hda_intel.c | 13 -------------
>>  1 file changed, 13 deletions(-)
>>
>> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
>> index b4540c5cd..9fc5e6c5d 100644
>> --- a/sound/pci/hda/hda_intel.c
>> +++ b/sound/pci/hda/hda_intel.c
>> @@ -1040,14 +1040,6 @@ static int azx_suspend(struct device *dev)
>>  	chip = card->private_data;
>>  	bus = azx_bus(chip);
>>  	azx_shutdown_chip(chip);
>> -	if (bus->irq >= 0) {
>> -		free_irq(bus->irq, chip);
>> -		bus->irq = -1;
>> -		chip->card->sync_irq = -1;
>> -	}
>> -
>> -	if (chip->msi)
>> -		pci_disable_msi(chip->pci);
>>  
>>  	trace_azx_suspend(chip);
>>  	return 0;
>> @@ -1062,11 +1054,6 @@ static int __maybe_unused azx_resume(struct device *dev)
>>  		return 0;
>>  
>>  	chip = card->private_data;
>> -	if (chip->msi)
>> -		if (pci_enable_msi(chip->pci) < 0)
>> -			chip->msi = 0;
>> -	if (azx_acquire_irq(chip, 1) < 0)
>> -		return -EIO;
>>  
>>  	__azx_runtime_resume(chip);
>>  
>> -- 
>> 2.47.0
>>