@@ -794,6 +794,75 @@ bool intel_audio_compute_config(struct intel_encoder *encoder,
return true;
}
+static int sad_to_channels(const u8 *sad)
+{
+ return 1 + (sad[0] & 0x7);
+}
+
+static inline u8 *eld_to_sad(u8 *eld)
+{
+ int ver, mnl;
+
+ ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
+ if (ver != 2 && ver != 31)
+ return NULL;
+
+ mnl = drm_eld_mnl(eld);
+ if (mnl > 16)
+ return NULL;
+
+ return eld + DRM_ELD_CEA_SAD(mnl, 0);
+}
+
+static int get_supported_freq_mask(struct intel_crtc_state *crtc_state)
+{
+ int audio_freq_hz[] = {32000, 44100, 48000, 88000, 96000, 176000, 192000, 0};
+ int mask = 0;
+
+ for (u8 index = 0; index < ARRAY_SIZE(audio_freq_hz); index++) {
+ mask |= 1 << index;
+ if (crtc_state->audio.max_frequency != audio_freq_hz[index])
+ continue;
+ else
+ break;
+ }
+
+ return mask;
+}
+
+void intel_audio_compute_eld(struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+ u8 *eld, *sad;
+ int index, mask = 0;
+
+ eld = crtc_state->eld;
+ if (!eld) {
+ drm_err(&i915->drm, "failed to locate eld\n");
+ return;
+ }
+
+ sad = (u8 *)eld_to_sad(eld);
+ if (sad) {
+ mask = get_supported_freq_mask(crtc_state);
+
+ for (index = 0; index < drm_eld_sad_count(eld); index++, sad += 3) {
+ /*
+ * Respect source restricitions. Limit capabilities to a subset that is
+ * supported both by the source and the sink.
+ */
+ if (sad_to_channels(sad) >= crtc_state->audio.max_channel) {
+ sad[0] &= ~0x7;
+ sad[0] |= crtc_state->audio.max_channel - 1;
+ drm_dbg_kms(&i915->drm, "Channel count is limited to %d\n",
+ crtc_state->audio.max_channel - 1);
+ }
+
+ sad[1] &= mask;
+ }
+ }
+}
+
/**
* intel_audio_codec_enable - Enable the audio codec for HD audio
* @encoder: encoder on which to enable audio
@@ -17,6 +17,7 @@ struct intel_encoder;
#define MAX_CHANNEL_COUNT 8
void intel_audio_hooks_init(struct drm_i915_private *dev_priv);
+void intel_audio_compute_eld(struct intel_crtc_state *crtc_state);
bool intel_audio_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state);
@@ -2402,6 +2402,8 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
return -EINVAL;
}
+ intel_audio_compute_eld(pipe_config);
+
return 0;
}
Compute SADs that takes into account the supported rate and channel based on the capabilities of the audio source. This wrapper function should encapsulate the logic for determining the supported rate and channel and should return a set of SADs that are compatible with the source. --v1: - call intel_audio_compute_eld in this commit as it is defined here --v2: - Handle case when max frequency is less than 32k. - remove drm prefix. - name change for parse_sad to eld_to_sad. --v3: - Use signed int wherever required. - add debug trace when channel is limited. Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com> --- drivers/gpu/drm/i915/display/intel_audio.c | 69 ++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_audio.h | 1 + drivers/gpu/drm/i915/display/intel_hdmi.c | 2 + 3 files changed, 72 insertions(+)