[alsa-devel] [PATCH] ALSA: hda - Enable runtime pm for Haswell

[Takashi Iwai]

At Thu, 16 May 2013 16:29:05 +0800,
Wang Xingchao wrote:
> 
> Haswell doesnot support runtime pm by default.
> This patch let haswell Display HD-A controller enter
> runtime suspend, and bring more power saving whith power-well.
> 
> Signed-off-by: Wang Xingchao <xingchao.wang at linux.intel.com>

I don't think it's good to fiddle such a thing in the driver side.
If Haswell can support runtime PM really, it should be set commonly.


Takashi

> ---
>  sound/pci/hda/hda_intel.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index bf27693..eb25888 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -3755,6 +3755,12 @@ static int azx_probe(struct pci_dev *pci,
>  
>  	if (pci_dev_run_wake(pci))
>  		pm_runtime_put_noidle(&pci->dev);
> +	else if (chip->driver_caps
> +			& AZX_DCAPS_I915_POWERWELL) {
> +		/* Haswell doesnot support runtime pm by default */
> +		pm_runtime_put_noidle(&pci->dev);
> +		pm_runtime_allow(&pci->dev);
> +	}
>  
>  	dev++;
>  	complete_all(&chip->probe_wait);
> -- 
> 1.7.9.5
>