1 files changed, 49 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index d8da18a9e98b..803b298f7411 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -596,4 +596,53 @@ void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld)
 }
 EXPORT_SYMBOL_HDA(snd_hda_eld_proc_free);
 
+/* update PCM info based on ELD */
+void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
+                              struct hda_pcm_stream *codec_pars)
+{
+        int i;
+
+        pcm->rates = 0;
+        pcm->formats = 0;
+        pcm->maxbps = 0;
+        pcm->channels_min = -1;
+        pcm->channels_max = 0;
+        for (i = 0; i < eld->sad_count; i++) {
+                struct cea_sad *a = &eld->sad[i];
+                pcm->rates |= a->rates;
+                if (a->channels < pcm->channels_min)
+                        pcm->channels_min = a->channels;
+                if (a->channels > pcm->channels_max)
+                        pcm->channels_max = a->channels;
+                if (a->format == AUDIO_CODING_TYPE_LPCM) {
+                        if (a->sample_bits & AC_SUPPCM_BITS_16) {
+                                pcm->formats |= SNDRV_PCM_FMTBIT_S16_LE;
+                                if (pcm->maxbps < 16)
+                                        pcm->maxbps = 16;
+                        }
+                        if (a->sample_bits & AC_SUPPCM_BITS_20) {
+                                pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
+                                if (pcm->maxbps < 20)
+                                        pcm->maxbps = 20;
+                        }
+                        if (a->sample_bits & AC_SUPPCM_BITS_24) {
+                                pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
+                                if (pcm->maxbps < 24)
+                                        pcm->maxbps = 24;
+                        }
+                }
+        }
+
+        if (!codec_pars)
+                return;
+
+        /* restrict the parameters by the values the codec provides */
+        pcm->rates &= codec_pars->rates;
+        pcm->formats &= codec_pars->formats;
+        pcm->channels_min = max(pcm->channels_min, codec_pars->channels_min);
+        pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max);
+        pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps);
+}
+EXPORT_SYMBOL_HDA(hdmi_eld_update_pcm_info);
+
 #endif /* CONFIG_PROC_FS */