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[PATCH 6.1.y 0/7] ASoC: codecs: es8326: fix support
by kovalev＠altlinux.org 13 Feb '24

13 Feb '24

These patches were backported from v6.6 upstream and are intended for 6.1.y stable kernel. Patches have been successfully tested on the latest 6.1.75 kernel. [PATCH 6.1.y 1/7] ASoC: codecs: es8326: Convert to i2c's .probe_new() [PATCH 6.1.y 2/7] ASoC: codecs: ES8326: Add es8326_mute function [PATCH 6.1.y 3/7] ASoC: codecs: ES8326: Change Hp_detect register names [PATCH 6.1.y 4/7] ASoC: codecs: ES8326: Change Volatile Reg function [PATCH 6.1.y 5/7] ASoC: codecs: ES8326: Fix power-up sequence [PATCH 6.1.y 6/7] ASOC: codecs: ES8326: Add calibration support for [PATCH 6.1.y 7/7] ASoC: codecs: ES8326: Update jact detection function

3 10

[PATCH] Add Lenovo Legion 7i gen7 sound quirk
by T. Kudela 13 Feb '24

13 Feb '24

Add sound support for the Legion 7i gen7 laptop (16IAX7). Signed-off-by: T. Kudela <ramzes005(a)gmail.com> --- sound/pci/hda/cs35l41_hda_property.c | 2 ++ sound/pci/hda/patch_realtek.c | 1 + 2 files changed, 3 insertions(+) diff --git a/sound/pci/hda/cs35l41_hda_property.c b/sound/pci/hda/cs35l41_hda_property.c index d74cf11eef1e..8a6b484b2184 100644 --- a/sound/pci/hda/cs35l41_hda_property.c +++ b/sound/pci/hda/cs35l41_hda_property.c @@ -95,6 +95,7 @@ static const struct cs35l41_config cs35l41_config_table[] = { { "10431F12", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 1000, 4500, 24 }, { "10431F1F", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, -1, 0, 0, 0, 0 }, { "10431F62", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 0, 0, 0 }, + { "17AA386F", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 0, 0, 0 }, { "17AA38B4", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 0, 0, 0 }, { "17AA38B5", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 0, 0, 0 }, { "17AA38B6", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 0, 0, 0 }, @@ -431,6 +432,7 @@ static const struct cs35l41_prop_model cs35l41_prop_model_table[] = { { "CSC3551", "10431F12", generic_dsd_config }, { "CSC3551", "10431F1F", generic_dsd_config }, { "CSC3551", "10431F62", generic_dsd_config }, + { "CSC3551", "17AA386F", generic_dsd_config }, { "CSC3551", "17AA38B4", generic_dsd_config }, { "CSC3551", "17AA38B5", generic_dsd_config }, { "CSC3551", "17AA38B6", generic_dsd_config }, diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c index 6994c4c5073c..0029f61d4693 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -10260,6 +10260,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = { SND_PCI_QUIRK(0x17aa, 0x3853, "Lenovo Yoga 7 15ITL5", ALC287_FIXUP_YOGA7_14ITL_SPEAKERS), SND_PCI_QUIRK(0x17aa, 0x3855, "Legion 7 16ITHG6", ALC287_FIXUP_LEGION_16ITHG6), SND_PCI_QUIRK(0x17aa, 0x3869, "Lenovo Yoga7 14IAL7", ALC287_FIXUP_YOGA9_14IAP7_BASS_SPK_PIN), + SND_PCI_QUIRK(0x17aa, 0x386f, "Legion 7i 16IAX7", ALC287_FIXUP_CS35L41_I2C_2), SND_PCI_QUIRK(0x17aa, 0x3870, "Lenovo Yoga 7 14ARB7", ALC287_FIXUP_YOGA7_14ARB7_I2C), SND_PCI_QUIRK(0x17aa, 0x387d, "Yoga S780-16 pro Quad AAC", ALC287_FIXUP_TAS2781_I2C), SND_PCI_QUIRK(0x17aa, 0x387e, "Yoga S780-16 pro Quad YC", ALC287_FIXUP_TAS2781_I2C), -- 2.34.1

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[PATCH] ASoC: dt-bindings: qcom,sm8250: Allow up to 8 codec DAIs
by Krzysztof Kozlowski 13 Feb '24

13 Feb '24

Sound card on Qualcomm X1E80100 CRD board has eight DAIs in one DAI link (for WSA speakers). Boards with older SoCs could technically have similar setup, even if it was not observed on mainlined devices. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org> --- DTS with X1E80100 sound card using this: https://lore.kernel.org/linux-devicetree/20240212172335.124845-5-krzysztof.… --- Documentation/devicetree/bindings/sound/qcom,sm8250.yaml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml b/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml index 6f419747273e..2ab6871e89e5 100644 --- a/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml +++ b/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml @@ -107,7 +107,7 @@ patternProperties: properties: sound-dai: minItems: 1 - maxItems: 4 + maxItems: 8 required: - link-name -- 2.34.1

2 2

[PATCH] ASoC: meson: add helpers for clk_disable_unprepare
by Arnd Bergmann 13 Feb '24

13 Feb '24

From: Arnd Bergmann <arnd(a)arndb.de> Casting between incompatible function types causes a warning with clang-16 because it breaks control flow integrity (KCFI) rules: sound/soc/meson/aiu.c:243:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] 243 | (void(*)(void *))clk_disable_unprepare, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/device.h:406:34: note: expanded from macro 'devm_add_action_or_reset' 406 | __devm_add_action_or_reset(dev, action, data, #action) | ^~~~~~ sound/soc/meson/t9015.c:274:4: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] 274 | (void(*)(void *))clk_disable_unprepare, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/device.h:406:34: note: expanded from macro 'devm_add_action_or_reset' 406 | __devm_add_action_or_reset(dev, action, data, #action) | ^~~~~~ These two meson drivers cast clk_disable_unprepare() into a different type in order to have it automatically called from the driver relase. Add trivial helpers to do the same using correct types. Fixes: 33901f5b9b16 ("ASoC: meson: add t9015 internal DAC driver") Fixes: 6ae9ca9ce986 ("ASoC: meson: aiu: add i2s and spdif support") Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- sound/soc/meson/aiu.c | 9 ++++++--- sound/soc/meson/t9015.c | 9 ++++++--- 2 files changed, 12 insertions(+), 6 deletions(-) diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c index 7109b81cc3d0..211f360df284 100644 --- a/sound/soc/meson/aiu.c +++ b/sound/soc/meson/aiu.c @@ -209,6 +209,11 @@ static const char * const aiu_spdif_ids[] = { [MCLK] = "spdif_mclk_sel" }; +static void aiu_clk_disable(void *clk) +{ + clk_disable_unprepare(clk); +} + static int aiu_clk_get(struct device *dev) { struct aiu *aiu = dev_get_drvdata(dev); @@ -239,9 +244,7 @@ static int aiu_clk_get(struct device *dev) return ret; } - ret = devm_add_action_or_reset(dev, - (void(*)(void *))clk_disable_unprepare, - aiu->pclk); + ret = devm_add_action_or_reset(dev, aiu_clk_disable, aiu->pclk); if (ret) dev_err(dev, "failed to add reset action on pclk"); diff --git a/sound/soc/meson/t9015.c b/sound/soc/meson/t9015.c index 9c6b4dac6893..e0f9a603a5e9 100644 --- a/sound/soc/meson/t9015.c +++ b/sound/soc/meson/t9015.c @@ -243,6 +243,11 @@ static const struct regmap_config t9015_regmap_config = { .max_register = POWER_CFG, }; +static void t9015_clk_disable(void *clk) +{ + clk_disable_unprepare(clk); +} + static int t9015_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -270,9 +275,7 @@ static int t9015_probe(struct platform_device *pdev) return ret; } - ret = devm_add_action_or_reset(dev, - (void(*)(void *))clk_disable_unprepare, - priv->pclk); + ret = devm_add_action_or_reset(dev, t9015_clk_disable, priv->pclk); if (ret) return ret; -- 2.39.2

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[PATCH] USB: Always select config with the highest supported UAC version
by Alexander Tsoy 13 Feb '24

13 Feb '24

Config with the highest supported UAC version is always preferable because it usually provides more features. Main motivation for this change is to improve support for several UAC2 devices which have UAC1 config as the first one for compatibility reasons. UAC2 mode provides a wider range of supported sampling rates on these devices. Also when UAC4 support is implemented, it will need just one additional case line without changing the logic. Signed-off-by: Alexander Tsoy <alexander(a)tsoy.me> --- drivers/usb/core/generic.c | 39 +++++++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 13 deletions(-) diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c index b134bff5c3fe..8aeb180e1cf9 100644 --- a/drivers/usb/core/generic.c +++ b/drivers/usb/core/generic.c @@ -48,9 +48,16 @@ static bool is_audio(struct usb_interface_descriptor *desc) return desc->bInterfaceClass == USB_CLASS_AUDIO; } -static bool is_uac3_config(struct usb_interface_descriptor *desc) +static bool is_supported_uac(struct usb_interface_descriptor *desc) { - return desc->bInterfaceProtocol == UAC_VERSION_3; + switch(desc->bInterfaceProtocol) { + case UAC_VERSION_1: + case UAC_VERSION_2: + case UAC_VERSION_3: + return true; + default: + return false; + } } int usb_choose_configuration(struct usb_device *udev) @@ -135,22 +142,28 @@ int usb_choose_configuration(struct usb_device *udev) } /* - * Select first configuration as default for audio so that - * devices that don't comply with UAC3 protocol are supported. - * But, still iterate through other configurations and - * select UAC3 compliant config if present. + * Iterate through audio configurations and select the first of + * the highest supported UAC versions. Select the first config + * if no supported UAC configs are found. */ if (desc && is_audio(desc)) { - /* Always prefer the first found UAC3 config */ - if (is_uac3_config(desc)) { - best = c; - break; - } + struct usb_interface_descriptor *best_desc = NULL; + + if (best) + best_desc = &best->intf_cache[0]->altsetting->desc; - /* If there is no UAC3 config, prefer the first config */ - else if (i == 0) + if (i == 0) best = c; + /* Assume that bInterfaceProtocol value is always + * growing when UAC versions are incremented, so that + * the direct comparison is possible. */ + else if (is_supported_uac(desc) && best_desc && + (!is_supported_uac(best_desc) || + (desc->bInterfaceProtocol > + best_desc->bInterfaceProtocol))) + best = c; + /* Unconditional continue, because the rest of the code * in the loop is irrelevant for audio devices, and * because it can reassign best, which for audio devices -- 2.43.0

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Coverity: virtsnd_kctl_tlv_op(): Uninitialized variables
by coverity-bot 12 Feb '24

12 Feb '24

Hello! This is an experimental semi-automated report about issues detected by Coverity from a scan of next-20240212 as part of the linux-next scan project: https://scan.coverity.com/projects/linux-next-weekly-scan You're getting this email because you were associated with the identified lines of code (noted below) that were touched by commits: Fri Feb 9 14:01:15 2024 +0100 d6568e3de42d ("ALSA: virtio: add support for audio controls") Coverity reported the following: *** CID 1583619: Uninitialized variables (UNINIT) sound/virtio/virtio_kctl.c:294 in virtsnd_kctl_tlv_op() 288 289 break; 290 } 291 292 kfree(tlv); 293 vvv CID 1583619: Uninitialized variables (UNINIT) vvv Using uninitialized value "rc". 294 return rc; 295 } 296 297 /** 298 * virtsnd_kctl_get_enum_items() - Query items for the ENUMERATED element type. 299 * @snd: VirtIO sound device. If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first): Reported-by: coverity-bot <keescook+coverity-bot(a)chromium.org> Addresses-Coverity-ID: 1583619 ("Uninitialized variables") Fixes: d6568e3de42d ("ALSA: virtio: add support for audio controls") Thanks for your attention! (Human comment: looks like there's no "default" case in the switch statement.) -- Coverity-bot

1 0

[PATCH v2 00/33] spi: get rid of some legacy macros
by Uwe Kleine-König 12 Feb '24

12 Feb '24

Hello, this is v2 of this patch set. Changes since (implicit) v1, sent with Message-Id: cover.1705348269.git.u.kleine-koenig(a)pengutronix.de: - Rebase to v6.8-rc1 - Fix a build failure on sh - Added the tags received in (implicit) v1. The slave-mt27xx driver needs some more work. The patch presented here is enough however to get rid of the defines handled in patch 32. Cleaning that up is out-of-scope for this series, so I'll delay that until later. Note that Jonathan Cameron has already applied patch 3 to his tree, it didn't appear in a public tree though yet. I still included it here to make the kernel build bots happy. Best regards Uwe Uwe Kleine-König (33): fpga: ice40-spi: Follow renaming of SPI "master" to "controller" ieee802154: ca8210: Follow renaming of SPI "master" to "controller" iio: adc: ad_sigma_delta: Follow renaming of SPI "master" to "controller" Input: pxspad - follow renaming of SPI "master" to "controller" Input: synaptics-rmi4 - follow renaming of SPI "master" to "controller" media: mgb4: Follow renaming of SPI "master" to "controller" media: netup_unidvb: Follow renaming of SPI "master" to "controller" media: usb/msi2500: Follow renaming of SPI "master" to "controller" media: v4l2-subdev: Follow renaming of SPI "master" to "controller" misc: gehc-achc: Follow renaming of SPI "master" to "controller" mmc: mmc_spi: Follow renaming of SPI "master" to "controller" mtd: dataflash: Follow renaming of SPI "master" to "controller" mtd: rawnand: fsl_elbc: Let .probe retry if local bus is missing net: ks8851: Follow renaming of SPI "master" to "controller" net: vertexcom: mse102x: Follow renaming of SPI "master" to "controller" platform/chrome: cros_ec_spi: Follow renaming of SPI "master" to "controller" spi: bitbang: Follow renaming of SPI "master" to "controller" spi: cadence-quadspi: Don't emit error message on allocation error spi: cadence-quadspi: Follow renaming of SPI "master" to "controller" spi: cavium: Follow renaming of SPI "master" to "controller" spi: geni-qcom: Follow renaming of SPI "master" to "controller" spi: loopback-test: Follow renaming of SPI "master" to "controller" spi: slave-mt27xx: Follow renaming of SPI "master" to "controller" spi: spidev: Follow renaming of SPI "master" to "controller" staging: fbtft: Follow renaming of SPI "master" to "controller" staging: greybus: spi: Follow renaming of SPI "master" to "controller" tpm_tis_spi: Follow renaming of SPI "master" to "controller" usb: gadget: max3420_udc: Follow renaming of SPI "master" to "controller" video: fbdev: mmp: Follow renaming of SPI "master" to "controller" wifi: libertas: Follow renaming of SPI "master" to "controller" spi: fsl-lib: Follow renaming of SPI "master" to "controller" spi: Drop compat layer from renaming "master" to "controller" Documentation: spi: Update documentation for renaming "master" to "controller" .../driver-api/driver-model/devres.rst | 2 +- Documentation/spi/spi-summary.rst | 74 +++++++++---------- drivers/char/tpm/tpm_tis_spi_main.c | 4 +- drivers/fpga/ice40-spi.c | 4 +- drivers/iio/adc/ad_sigma_delta.c | 14 ++-- drivers/input/joystick/psxpad-spi.c | 4 +- drivers/input/rmi4/rmi_spi.c | 2 +- drivers/media/pci/mgb4/mgb4_core.c | 14 ++-- .../media/pci/netup_unidvb/netup_unidvb_spi.c | 48 ++++++------ drivers/media/usb/msi2500/msi2500.c | 38 +++++----- drivers/media/v4l2-core/v4l2-spi.c | 4 +- drivers/misc/gehc-achc.c | 8 +- drivers/mmc/host/mmc_spi.c | 6 +- drivers/mtd/devices/mtd_dataflash.c | 2 +- drivers/mtd/nand/raw/fsl_elbc_nand.c | 3 +- drivers/net/ethernet/micrel/ks8851_spi.c | 4 +- drivers/net/ethernet/vertexcom/mse102x.c | 2 +- drivers/net/ieee802154/ca8210.c | 2 +- .../net/wireless/marvell/libertas/if_spi.c | 2 +- drivers/platform/chrome/cros_ec_spi.c | 8 +- drivers/spi/spi-ath79.c | 4 +- drivers/spi/spi-bitbang.c | 64 ++++++++-------- drivers/spi/spi-butterfly.c | 6 +- drivers/spi/spi-cadence-quadspi.c | 7 +- drivers/spi/spi-cavium.c | 6 +- drivers/spi/spi-cavium.h | 2 +- drivers/spi/spi-davinci.c | 6 +- drivers/spi/spi-fsl-lib.c | 14 ++-- drivers/spi/spi-geni-qcom.c | 2 +- drivers/spi/spi-gpio.c | 2 +- drivers/spi/spi-lm70llp.c | 6 +- drivers/spi/spi-loopback-test.c | 4 +- drivers/spi/spi-oc-tiny.c | 6 +- drivers/spi/spi-omap-uwire.c | 4 +- drivers/spi/spi-sh-sci.c | 10 +-- drivers/spi/spi-slave-mt27xx.c | 2 +- drivers/spi/spi-xilinx.c | 4 +- drivers/spi/spi-xtensa-xtfpga.c | 2 +- drivers/spi/spi.c | 2 +- drivers/spi/spidev.c | 2 +- drivers/staging/fbtft/fbtft-core.c | 4 +- drivers/staging/greybus/spilib.c | 66 ++++++++--------- drivers/usb/gadget/udc/max3420_udc.c | 2 +- drivers/video/fbdev/mmp/hw/mmp_spi.c | 26 +++---- include/linux/spi/spi.h | 20 +---- include/linux/spi/spi_bitbang.h | 2 +- include/media/v4l2-common.h | 6 +- 47 files changed, 254 insertions(+), 272 deletions(-) base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d -- 2.43.0

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[PATCH 1/2] ASoC: rt5645: Make LattePanda board DMI match more precise
by Hans de Goede 12 Feb '24

12 Feb '24

The DMI strings used for the LattePanda board DMI quirks are very generic. Using the dmidecode database from https://linux-hardware.org/ shows that the chosen DMI strings also match the following 2 laptops which also have a rt5645 codec: Insignia NS-P11W7100 https://linux-hardware.org/?computer=E092FFF8BA04 Insignia NS-P10W8100 https://linux-hardware.org/?computer=AFB6C0BF7934 All 4 hw revisions of the LattePanda board have "S70CR" in their BIOS version DMI strings: DF-BI-7-S70CR100-* DF-BI-7-S70CR110-* DF-BI-7-S70CR200-* LP-BS-7-S70CR700-* See e.g. https://linux-hardware.org/?computer=D98250A817C0 Add a partial (non exact) DMI match on this string to make the LattePanda board DMI match more precise to avoid false-positive matches. Signed-off-by: Hans de Goede <hdegoede(a)redhat.com> --- sound/soc/codecs/rt5645.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c index 5150d6ee3748..b3865e3c3259 100644 --- a/sound/soc/codecs/rt5645.c +++ b/sound/soc/codecs/rt5645.c @@ -3837,6 +3837,16 @@ static const struct dmi_system_id dmi_platform_data[] = { DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), DMI_EXACT_MATCH(DMI_BOARD_VERSION, "Default string"), + /* + * Above strings are too generic, LattePanda BIOS versions for + * all 4 hw revisions are: + * DF-BI-7-S70CR100-* + * DF-BI-7-S70CR110-* + * DF-BI-7-S70CR200-* + * LP-BS-7-S70CR700-* + * Do a partial match for S70CR to avoid false positive matches. + */ + DMI_MATCH(DMI_BIOS_VERSION, "S70CR"), }, .driver_data = (void *)&lattepanda_board_platform_data, }, -- 2.43.0

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[PATCH] soundwire: fix double free of pointer
by Daniil Dulov 12 Feb '24

12 Feb '24

If sdw_ml_sync_bank_switch() returns error not on the first iteration, it leads to freeing prevously freed memory. So, set the pointer to NULL after each successful bank switch. Signed-off-by: Daniil Dulov <d.dulov(a)aladdin.ru> --- drivers/soundwire/stream.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c index 304ff2ee7d75..d650e6f0f8e7 100644 --- a/drivers/soundwire/stream.c +++ b/drivers/soundwire/stream.c @@ -833,6 +833,7 @@ static int do_bank_switch(struct sdw_stream_runtime *stream) "multi link bank switch failed: %d\n", ret); goto error; } + bus->defer_msg.msg = NULL; if (multi_link) mutex_unlock(&bus->msg_lock); -- 2.25.1

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ALSA-LIB: correct IEC958 preambles for PCM multichannel?
by Pavel Hofman 12 Feb '24

12 Feb '24

Hi, I wonder if the pcm_iec958.c correctly sets preambles for multichannel PCM/LPCM. It looks as if coded only for stereo. IIUC the X/Y preambles should alternate for even/odd channels. This check https://github.com/alsa-project/alsa-lib/blob/master/src/pcm/pcm_iec958.c#L… : if (channel) data |= iec->preamble[PREAMBLE_Y]; /* odd sub frame, 'Y' */ else if (! iec->counter) data |= iec->preamble[PREAMBLE_Z]; /* Block start, 'Z' */ else data |= iec->preamble[PREAMBLE_X]; /* even sub frame, 'X' */ IMO the condition should be "if (channel % 2)", because for multichannel only the first even channel ch0 gets Y, and the remaining even channels ch2, ch4, ... get X. This is confirmed by analyzing the generated stream captured with the file plugin. Also I am not sure if counting the subframes for Z preamble in https://github.com/alsa-project/alsa-lib/blob/master/src/pcm/pcm_iec958.c#L… respects the multichannel. I do not know what "parallel IEC958 streams" mean, how the Z preamble should be placed for PCM multichannel. A) Either it can count all channel pairs sequentially up to 192, i.e. preamble Z after 192 pair of (ch0, ch1), (ch2, ch3),... If so, IMO the incrementation in https://github.com/alsa-project/alsa-lib/blob/master/src/pcm/pcm_iec958.c#L… should increment by channels/2, not by 1 (which fits for channels=2) B) Or it can count each channel pair separately, i.e. 4 preables Z (for 8ch) in a row after 192 pairs of (ch0+ch1), 192 pairs of (ch2+ch3), etc. If so, IMO the counter should be reset after looping for all channel frames also for PCM, not only for nonaudio/single_stream https://github.com/alsa-project/alsa-lib/blob/master/src/pcm/pcm_iec958.c#L… The reason I am looking at this code are the problems with channel swaps at xrun handling of RPi HDMI https://forums.raspberrypi.com/viewtopic.php?p=2187582#p2187540. I suspect the iec958 plugin does not generate correct multichannel IEC958 stream which confuses the HDMI receiver at the stream recovery. Thanks a lot, Pavel.

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