hdmi_setup_fake_chmap() is supposed to set the reported channel map when the channel map is not specified by the user.
However, the function indexes channel_allocations[] with a wrong value and extracts the wrong nibble from hdmi_channel_mapping[], causing wrong channel maps to be shown.
Fix those issues.
Tested on Intel HDMI to correctly generate various channel maps, for example 3,4,14,15,7,8,5,6 (instead of incorrect 3,4,8,7,5,6,14,0) for standard 7.1 channel audio. (Note that the side and rear channels are reported as RL/RR and RLC/RRC, respectively, as per the CEA-861 standard, instead of the more traditional SL/SR and RL/RR.)
Note that this only fixes the layouts that only contain traditional 7.1 speakers (2.0, 2.1, 4.0, 5.1, 7.1, etc.). E.g. the rear center of 6.1 is still being shown wrongly due to an issue with from_cea_slot() which will be fixed in a later patch.
Signed-off-by: Anssi Hannula anssi.hannula@iki.fi ---
I'm assuming the usage of RL/RR and RLC/RRC instead of SL/SR and RL/RR is intentional. If not, everything needs to be rethinked.
sound/pci/hda/patch_hdmi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 09f38a1..6ed34df 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -742,9 +742,10 @@ static int hdmi_manual_setup_channel_mapping(struct hda_codec *codec, static void hdmi_setup_fake_chmap(unsigned char *map, int ca) { int i; + int ordered_ca = get_channel_allocation_order(ca); for (i = 0; i < 8; i++) { - if (i < channel_allocations[ca].channels) - map[i] = from_cea_slot((hdmi_channel_mapping[ca][i] >> 4) & 0x0f); + if (i < channel_allocations[ordered_ca].channels) + map[i] = from_cea_slot(hdmi_channel_mapping[ca][i] & 0x0f); else map[i] = 0; }