ALSA: hda - hdmi: Fix incorrect default channel mapping for unusual CAs (90f28002) · Commits · 戴 / test

hdmi_std_setup_channel_mapping() selects a Channel Allocation according to the sink reported speaker mask, preferring the ALSA standard layouts. If the channel allocation is not one of the ALSA standard layouts, the ALSA channels are mapped directly to HDMI channels in order. However, the function does not take into account that there a holes in the HDMI channel map. Additionally, the function tries to disable a slot by using AC_VERB_SET_CHAN_SLOT with parameter ((alsa_ch << 8) | 0xf), while the correct parameter is ((0xf << 8) | hdmi_slot), i.e. the slot should be unassigned, not the ALSA channel. Fix both of the issues for non-ALSA-default layouts. Tested on Intel HDMI with a speaker mask of FL | FR | FC | RC, which causes CA 0x06 to be selected for 4-channel audio, which causes incorrect output (sound destined to RC goes to FC and FC goes nowhere) without the patch. Signed-off-by:

Anssi Hannula <anssi.hannula@iki.fi> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

+15 −5

Original line number	Diff line number	Diff line
		@@ -595,22 +595,32 @@ static void hdmi_std_setup_channel_mapping(struct hda_codec *codec,
		bool non_pcm,
		int ca)
		{
		struct cea_channel_speaker_allocation *ch_alloc;
		int i;
		int err;
		int order;
		int non_pcm_mapping[8];

		order = get_channel_allocation_order(ca);
		ch_alloc = &channel_allocations[order];

		if (hdmi_channel_mapping[ca][1] == 0) {
		for (i = 0; i < channel_allocations[order].channels; i++)
		hdmi_channel_mapping[ca][i] = i \| (i << 4);
		for (; i < 8; i++)
		hdmi_channel_mapping[ca][i] = 0xf \| (i << 4);
		int hdmi_slot = 0;
		/* fill actual channel mappings in ALSA channel (i) order */
		for (i = 0; i < ch_alloc->channels; i++) {
		while (!ch_alloc->speakers[7 - hdmi_slot] && !WARN_ON(hdmi_slot >= 8))
		hdmi_slot++; /* skip zero slots */

		hdmi_channel_mapping[ca][i] = (i << 4) \| hdmi_slot++;
		}
		/* fill the rest of the slots with ALSA channel 0xf */
		for (hdmi_slot = 0; hdmi_slot < 8; hdmi_slot++)
		if (!ch_alloc->speakers[7 - hdmi_slot])
		hdmi_channel_mapping[ca][i++] = (0xf << 4) \| hdmi_slot;
		}

		if (non_pcm) {
		for (i = 0; i < channel_allocations[order].channels; i++)
		for (i = 0; i < ch_alloc->channels; i++)
		non_pcm_mapping[i] = i \| (i << 4);
		for (; i < 8; i++)
		non_pcm_mapping[i] = 0xf \| (i << 4);

Admin message