On Thu, 14 Nov 2019 12:50:29 +0100,
Nikhil Mahale wrote:
>
> On 11/14/19 4:32 PM, Takashi Iwai wrote:
> > On Thu, 14 Nov 2019 04:37:04 +0100,
> > Nikhil Mahale wrote:
> >>
> >> @@ -3494,11 +3500,86 @@ static const struct drm_audio_component_audio_ops nvhdmi_audio_ops = {
> >> .master_unbind = generic_acomp_master_unbind,
> >> };
> >>
> >> +static int nvhdmi_find_pcm_slot(struct hdmi_spec *spec,
> >> + struct hdmi_spec_per_pin *per_pin)
> >> +{
> >> + int i;
> >> +
> >> + /*
> >> + * generic_hdmi_build_pcms() allocates (num_nids + dev_num - 1)
> >> + * number of pcms.
> >> + *
> >> + * The per_pin of pin_nid_idx=n and dev_id=m prefers to get pcm-n if m==0.
> >> + * This guarantees that dynamic pcm assignments are compatible with the
> >> + * legacy static per_pin-pmc assignment that existed in the days before
> >> + * DP-MST.
> >> + *
> >> + * per_pin of m!=0 prefers to get pcm=(num_nids + (m - 1)).
> >> + */
> >> + if (per_pin->dev_id == 0 &&
> >> + !test_bit(per_pin->pin_nid_idx, &spec->pcm_bitmap))
> >> + return per_pin->pin_nid_idx;
> >> +
> >> + if (per_pin->dev_id != 0 &&
> >> + !(test_bit(spec->num_nids + (per_pin->dev_id - 1),
> >> + &spec->pcm_bitmap))) {
> >> + return spec->num_nids + (per_pin->dev_id - 1);
> >> + }
> >> +
> >> + /* have a second try; check the area over num_nids */
> >> + for (i = spec->num_nids; i < spec->pcm_used; i++) {
> >> + if (!test_bit(i, &spec->pcm_bitmap))
> >> + return i;
> >> + }
> >> +
> >> + /* the last try; check the empty slots in pins */
> >> + for (i = 0; i < spec->num_nids; i++) {
> >> + if (!test_bit(i, &spec->pcm_bitmap))
> >> + return i;
> >> + }
> >> + return -EBUSY;
> >> +}
> >
> > I think this can be applied for Intel case, too. No need for creating
> > yet another indirect branch.
>
> Do you mean I should replace existing logic in hdmi_find_pcm_slot()
> by this new logic?
Yes. It's a dynamic assignment for DP-MST in anyway, so the
compatibility of the assigned index shouldn't be a big matter.
Takashi
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