ACK: [SRU][H/G/OEM-5.10][PATCH 1/1] ALSA: hda/hdmi: let new platforms assign the pcm slot dynamically

[Stefan Bader]

On 05.03.21 07:06, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1917829
> 
> If the platform set the dyn_pcm_assign to true, it will call
> hdmi_find_pcm_slot() to find a pcm slot when hdmi/dp monitor is
> connected and need to create a pcm.
> 
> So far only intel_hsw_common_init() and patch_nvhdmi() set the
> dyn_pcm_assign to true, here we let tgl platforms assign the pcm slot
> dynamically first, if the driver runs for a period of time and there
> is no regression reported, we could set no_fixed_assgin to true in
> the intel_hsw_common_init(), and then set it to true in the
> patch_nvhdmi().
> 
> This change comes from the discussion between Takashi and
> Kai Vehmanen. Please refer to:
> https://github.com/alsa-project/alsa-lib/pull/118
> 
> Suggested-and-reviewed-by: Takashi Iwai <tiwai at suse.de>
> Suggested-and-reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
> Signed-off-by: Hui Wang <hui.wang at canonical.com>
> Link: https://lore.kernel.org/r/20210301111202.2684-1-hui.wang@canonical.com
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> (cherry picked from commit 13046370c4d143b629adc1a51659a8a6497fbbe6 linux-next)
> Signed-off-by: Hui Wang <hui.wang at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---
>   sound/pci/hda/patch_hdmi.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 97adff0cbcab..0d004089fcc6 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -157,6 +157,7 @@ struct hdmi_spec {
>   
>   	bool dyn_pin_out;
>   	bool dyn_pcm_assign;
> +	bool dyn_pcm_no_legacy;
>   	bool intel_hsw_fixup;	/* apply Intel platform-specific fixups */
>   	/*
>   	 * Non-generic VIA/NVIDIA specific
> @@ -1345,6 +1346,12 @@ static int hdmi_find_pcm_slot(struct hdmi_spec *spec,
>   {
>   	int i;
>   
> +	/* on the new machines, try to assign the pcm slot dynamically,
> +	 * not use the preferred fixed map (legacy way) anymore.
> +	 */
> +	if (spec->dyn_pcm_no_legacy)
> +		goto last_try;
> +
>   	/*
>   	 * generic_hdmi_build_pcms() may allocate extra PCMs on some
>   	 * platforms (with maximum of 'num_nids + dev_num - 1')
> @@ -1374,6 +1381,7 @@ static int hdmi_find_pcm_slot(struct hdmi_spec *spec,
>   			return i;
>   	}
>   
> + last_try:
>   	/* the last try; check the empty slots in pins */
>   	for (i = 0; i < spec->num_nids; i++) {
>   		if (!test_bit(i, &spec->pcm_bitmap))
> @@ -2988,8 +2996,16 @@ static int patch_i915_tgl_hdmi(struct hda_codec *codec)
>   	 * the index indicate the port number.
>   	 */
>   	static const int map[] = {0x4, 0x6, 0x8, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
> +	int ret;
>   
> -	return intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map));
> +	ret = intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map));
> +	if (!ret) {
> +		struct hdmi_spec *spec = codec->spec;
> +
> +		spec->dyn_pcm_no_legacy = true;
> +	}
> +
> +	return ret;
>   }
>   
>   /* Intel Baytrail and Braswell; with eld notifier */
> 


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