[alsa-devel] [PATCH] ALSA: hda - add AZX_DCAPS_I915_POWERWELL to Baytrail

[Takashi Iwai]

At Tue, 21 Apr 2015 13:12:23 +0800,
mengdong.lin at intel.com wrote:
> 
> From: Mengdong Lin <mengdong.lin at intel.com>
> 
> This patch addes AZX_DCAPS_I915_POWERWELL to BYT (Baytrail).
> 
> Like Braswell and Skylake, the HDMI codec on Bytrail is also in the shared
> power well with GPU. This power well must be turned on before we reset link
> to probe the codec, to avoid communication failure with the codec.
> 
> The side effect is that this power is always ON in S0 because the BYT HDMI
> codec does not support EPSS or D3ClkStop and so the controller doesn't enter
> D3 at runtime, and the HDMI codec and analog codec share a single physical
> HD-A link and so we cannot reset the HD-A link freely when we re-enable the
> power to use the HDMI codec.
> 
> Next step is to test if an AGP reset or double AGP reset on BYT HDMI codec is
> okay to bring the HDMI codec back to a functional state after restoring the
> power. If okay, we can bind the power on/off with the HDMI codec PM without
> interrupting the analog audio.
> 
> Signed-off-by: Mengdong Lin <mengdong.lin at intel.com>

Applied, thanks.


Takashi

> 
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index e1c2105..34040d2 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -297,6 +297,9 @@ enum {
>  	 AZX_DCAPS_PM_RUNTIME | AZX_DCAPS_I915_POWERWELL |\
>  	 AZX_DCAPS_SNOOP_TYPE(SCH))
>  
> +#define AZX_DCAPS_INTEL_BAYTRAIL \
> +	(AZX_DCAPS_INTEL_PCH_NOPM | AZX_DCAPS_I915_POWERWELL)
> +
>  #define AZX_DCAPS_INTEL_BRASWELL \
>  	(AZX_DCAPS_INTEL_PCH | AZX_DCAPS_I915_POWERWELL)
>  
> @@ -1992,7 +1995,7 @@ static const struct pci_device_id azx_ids[] = {
>  	  .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },
>  	/* BayTrail */
>  	{ PCI_DEVICE(0x8086, 0x0f04),
> -	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
> +	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_BAYTRAIL },
>  	/* Braswell */
>  	{ PCI_DEVICE(0x8086, 0x2284),
>  	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_BRASWELL },
> -- 
> 1.9.1
>