diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0131-bcm2835-always-use-2-4-8-channels-for-multichannel-l.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0131-bcm2835-always-use-2-4-8-channels-for-multichannel-l.patch | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0131-bcm2835-always-use-2-4-8-channels-for-multichannel-l.patch b/target/linux/brcm2708/patches-4.4/0131-bcm2835-always-use-2-4-8-channels-for-multichannel-l.patch new file mode 100644 index 0000000000..76dede73fa --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0131-bcm2835-always-use-2-4-8-channels-for-multichannel-l.patch @@ -0,0 +1,139 @@ +From 06931f74092d86087144f070b06a4444df8b444b Mon Sep 17 00:00:00 2001 +From: wm4 <wm4@nowhere> +Date: Wed, 13 Jan 2016 19:44:03 +0100 +Subject: [PATCH 131/232] bcm2835: always use 2/4/8 channels for multichannel + layouts + +Pad the unused channels with NA. This means userspace needs to write +additional, silent padding channels, which is not ideal, but better +than noise. + +Works around noise at the following channel counts: 3, 5, 6, 7 +--- + sound/arm/bcm2835-ctl.c | 89 +++++++++++++++++++++++++------------------------ + 1 file changed, 45 insertions(+), 44 deletions(-) + +--- a/sound/arm/bcm2835-ctl.c ++++ b/sound/arm/bcm2835-ctl.c +@@ -349,6 +349,7 @@ struct cea_channel_speaker_allocation { + #define FRW SNDRV_CHMAP_FRW + #define TC SNDRV_CHMAP_TC + #define FCH SNDRV_CHMAP_TFC ++#define NA SNDRV_CHMAP_NA + + /* + * CEA-861 channel maps +@@ -356,69 +357,69 @@ struct cea_channel_speaker_allocation { + * Stolen from sound/pci/hda/patch_hdmi.c + * (unlike the source, this uses SNDRV_* constants directly, as by the + * map_tables array in patch_hdmi.c) +- * Unknown entries use 0, which unfortunately is SNDRV_CHMAP_UNKNOWN instead +- * of SNDRV_CHMAP_NA. ++ * Entries which do not have a physical output channel use 0. Entries which ++ * require userspace to output silence use NA (SNDRV_CHMAP_NA). + */ + static struct cea_channel_speaker_allocation channel_allocations[] = { + /* channel: 7 6 5 4 3 2 1 0 */ + { .ca_index = 0x00, .speakers = { 0, 0, 0, 0, 0, 0, FR, FL } }, + /* 2.1 */ +-{ .ca_index = 0x01, .speakers = { 0, 0, 0, 0, 0, LFE, FR, FL } }, ++{ .ca_index = 0x01, .speakers = { 0, 0, 0, 0, NA, LFE, FR, FL } }, + /* Dolby Surround */ +-{ .ca_index = 0x02, .speakers = { 0, 0, 0, 0, FC, 0, FR, FL } }, ++{ .ca_index = 0x02, .speakers = { 0, 0, 0, 0, FC, NA, FR, FL } }, + /* surround40 */ +-{ .ca_index = 0x08, .speakers = { 0, 0, RR, RL, 0, 0, FR, FL } }, ++{ .ca_index = 0x08, .speakers = { NA, NA, RR, RL, NA, NA, FR, FL } }, + /* surround41 */ +-{ .ca_index = 0x09, .speakers = { 0, 0, RR, RL, 0, LFE, FR, FL } }, ++{ .ca_index = 0x09, .speakers = { NA, NA, RR, RL, NA, LFE, FR, FL } }, + /* surround50 */ +-{ .ca_index = 0x0a, .speakers = { 0, 0, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x0a, .speakers = { NA, NA, RR, RL, FC, NA, FR, FL } }, + /* surround51 */ +-{ .ca_index = 0x0b, .speakers = { 0, 0, RR, RL, FC, LFE, FR, FL } }, ++{ .ca_index = 0x0b, .speakers = { NA, NA, RR, RL, FC, LFE, FR, FL } }, + /* 6.1 */ +-{ .ca_index = 0x0f, .speakers = { 0, RC, RR, RL, FC, LFE, FR, FL } }, ++{ .ca_index = 0x0f, .speakers = { NA, RC, RR, RL, FC, LFE, FR, FL } }, + /* surround71 */ + { .ca_index = 0x13, .speakers = { RRC, RLC, RR, RL, FC, LFE, FR, FL } }, + +-{ .ca_index = 0x03, .speakers = { 0, 0, 0, 0, FC, LFE, FR, FL } }, +-{ .ca_index = 0x04, .speakers = { 0, 0, 0, RC, 0, 0, FR, FL } }, +-{ .ca_index = 0x05, .speakers = { 0, 0, 0, RC, 0, LFE, FR, FL } }, +-{ .ca_index = 0x06, .speakers = { 0, 0, 0, RC, FC, 0, FR, FL } }, +-{ .ca_index = 0x07, .speakers = { 0, 0, 0, RC, FC, LFE, FR, FL } }, +-{ .ca_index = 0x0c, .speakers = { 0, RC, RR, RL, 0, 0, FR, FL } }, +-{ .ca_index = 0x0d, .speakers = { 0, RC, RR, RL, 0, LFE, FR, FL } }, +-{ .ca_index = 0x0e, .speakers = { 0, RC, RR, RL, FC, 0, FR, FL } }, +-{ .ca_index = 0x10, .speakers = { RRC, RLC, RR, RL, 0, 0, FR, FL } }, +-{ .ca_index = 0x11, .speakers = { RRC, RLC, RR, RL, 0, LFE, FR, FL } }, +-{ .ca_index = 0x12, .speakers = { RRC, RLC, RR, RL, FC, 0, FR, FL } }, +-{ .ca_index = 0x14, .speakers = { FRC, FLC, 0, 0, 0, 0, FR, FL } }, +-{ .ca_index = 0x15, .speakers = { FRC, FLC, 0, 0, 0, LFE, FR, FL } }, +-{ .ca_index = 0x16, .speakers = { FRC, FLC, 0, 0, FC, 0, FR, FL } }, +-{ .ca_index = 0x17, .speakers = { FRC, FLC, 0, 0, FC, LFE, FR, FL } }, +-{ .ca_index = 0x18, .speakers = { FRC, FLC, 0, RC, 0, 0, FR, FL } }, +-{ .ca_index = 0x19, .speakers = { FRC, FLC, 0, RC, 0, LFE, FR, FL } }, +-{ .ca_index = 0x1a, .speakers = { FRC, FLC, 0, RC, FC, 0, FR, FL } }, +-{ .ca_index = 0x1b, .speakers = { FRC, FLC, 0, RC, FC, LFE, FR, FL } }, +-{ .ca_index = 0x1c, .speakers = { FRC, FLC, RR, RL, 0, 0, FR, FL } }, +-{ .ca_index = 0x1d, .speakers = { FRC, FLC, RR, RL, 0, LFE, FR, FL } }, +-{ .ca_index = 0x1e, .speakers = { FRC, FLC, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x03, .speakers = { NA, NA, NA, NA, FC, LFE, FR, FL } }, ++{ .ca_index = 0x04, .speakers = { NA, NA, NA, RC, NA, NA, FR, FL } }, ++{ .ca_index = 0x05, .speakers = { NA, NA, NA, RC, NA, LFE, FR, FL } }, ++{ .ca_index = 0x06, .speakers = { NA, NA, NA, RC, FC, NA, FR, FL } }, ++{ .ca_index = 0x07, .speakers = { NA, NA, NA, RC, FC, LFE, FR, FL } }, ++{ .ca_index = 0x0c, .speakers = { NA, RC, RR, RL, NA, NA, FR, FL } }, ++{ .ca_index = 0x0d, .speakers = { NA, RC, RR, RL, NA, LFE, FR, FL } }, ++{ .ca_index = 0x0e, .speakers = { NA, RC, RR, RL, FC, NA, FR, FL } }, ++{ .ca_index = 0x10, .speakers = { RRC, RLC, RR, RL, NA, NA, FR, FL } }, ++{ .ca_index = 0x11, .speakers = { RRC, RLC, RR, RL, NA, LFE, FR, FL } }, ++{ .ca_index = 0x12, .speakers = { RRC, RLC, RR, RL, FC, NA, FR, FL } }, ++{ .ca_index = 0x14, .speakers = { FRC, FLC, NA, NA, NA, NA, FR, FL } }, ++{ .ca_index = 0x15, .speakers = { FRC, FLC, NA, NA, NA, LFE, FR, FL } }, ++{ .ca_index = 0x16, .speakers = { FRC, FLC, NA, NA, FC, NA, FR, FL } }, ++{ .ca_index = 0x17, .speakers = { FRC, FLC, NA, NA, FC, LFE, FR, FL } }, ++{ .ca_index = 0x18, .speakers = { FRC, FLC, NA, RC, NA, NA, FR, FL } }, ++{ .ca_index = 0x19, .speakers = { FRC, FLC, NA, RC, NA, LFE, FR, FL } }, ++{ .ca_index = 0x1a, .speakers = { FRC, FLC, NA, RC, FC, NA, FR, FL } }, ++{ .ca_index = 0x1b, .speakers = { FRC, FLC, NA, RC, FC, LFE, FR, FL } }, ++{ .ca_index = 0x1c, .speakers = { FRC, FLC, RR, RL, NA, NA, FR, FL } }, ++{ .ca_index = 0x1d, .speakers = { FRC, FLC, RR, RL, NA, LFE, FR, FL } }, ++{ .ca_index = 0x1e, .speakers = { FRC, FLC, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x1f, .speakers = { FRC, FLC, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x20, .speakers = { 0, FCH, RR, RL, FC, 0, FR, FL } }, +-{ .ca_index = 0x21, .speakers = { 0, FCH, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x22, .speakers = { TC, 0, RR, RL, FC, 0, FR, FL } }, +-{ .ca_index = 0x23, .speakers = { TC, 0, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x24, .speakers = { FRH, FLH, RR, RL, 0, 0, FR, FL } }, +-{ .ca_index = 0x25, .speakers = { FRH, FLH, RR, RL, 0, LFE, FR, FL } }, +-{ .ca_index = 0x26, .speakers = { FRW, FLW, RR, RL, 0, 0, FR, FL } }, +-{ .ca_index = 0x27, .speakers = { FRW, FLW, RR, RL, 0, LFE, FR, FL } }, +-{ .ca_index = 0x28, .speakers = { TC, RC, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x20, .speakers = { NA, FCH, RR, RL, FC, NA, FR, FL } }, ++{ .ca_index = 0x21, .speakers = { NA, FCH, RR, RL, FC, LFE, FR, FL } }, ++{ .ca_index = 0x22, .speakers = { TC, NA, RR, RL, FC, NA, FR, FL } }, ++{ .ca_index = 0x23, .speakers = { TC, NA, RR, RL, FC, LFE, FR, FL } }, ++{ .ca_index = 0x24, .speakers = { FRH, FLH, RR, RL, NA, NA, FR, FL } }, ++{ .ca_index = 0x25, .speakers = { FRH, FLH, RR, RL, NA, LFE, FR, FL } }, ++{ .ca_index = 0x26, .speakers = { FRW, FLW, RR, RL, NA, NA, FR, FL } }, ++{ .ca_index = 0x27, .speakers = { FRW, FLW, RR, RL, NA, LFE, FR, FL } }, ++{ .ca_index = 0x28, .speakers = { TC, RC, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x29, .speakers = { TC, RC, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x2a, .speakers = { FCH, RC, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x2a, .speakers = { FCH, RC, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x2b, .speakers = { FCH, RC, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x2c, .speakers = { TC, FCH, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x2c, .speakers = { TC, FCH, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x2d, .speakers = { TC, FCH, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x2e, .speakers = { FRH, FLH, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x2e, .speakers = { FRH, FLH, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x2f, .speakers = { FRH, FLH, RR, RL, FC, LFE, FR, FL } }, +-{ .ca_index = 0x30, .speakers = { FRW, FLW, RR, RL, FC, 0, FR, FL } }, ++{ .ca_index = 0x30, .speakers = { FRW, FLW, RR, RL, FC, NA, FR, FL } }, + { .ca_index = 0x31, .speakers = { FRW, FLW, RR, RL, FC, LFE, FR, FL } }, + }; + |