bfe-core1106-sdk/kernel/rv1106-enablement/audio/PORT-PROGRESS.md

RV1106 Audio Codec: 5.10 (Rockchip BSP) -> 6.18.46 Port

Status: zImage + rockchip/rv1106-warden.dtb build cleanly, 0 errors, 0 warnings, with SND_SOC_RV1106=y (acodec) and SND_SOC_RK_DSM=y (dsm) both built in, and the simple-audio-card sound card wired in the board DT. Verified against System.map (host grep, not cross-nm: see Verification below). Not flashed or run on hardware: this is a build-only port; on-target audio verification is explicitly deferred to the parent session / bench.

Trees involved:

• Target (edited): <flare-edge>/research/linux-6.18.46/
• Vendor source (read-only, copy-from): <flare-edge>/sdk/sysdrv/source/kernel/ (Rockchip 5.10.160)

Audio path

i2s0_8ch (DAI, already built/enabled pre-port) -> acodec (analog codec, this port) -> speaker/headphone, tied together by a mainline simple-audio-card. The digital speaker modulator (dsm) was also ported and builds cleanly, but is left disabled in the board DT, matching the vendor 86-Panel board file (rv1106-luckfox-pico-86panel-ipc.dtsi), which also ships dsm and dsm_sound disabled: the panel's actual audio path is acodec-only.

Files copied (verbatim from vendor, then patched in place)

From sdk/sysdrv/source/kernel/sound/soc/codecs/ to the 6.18 tree's sound/soc/codecs/:

File	Lines	Notes
rv1106_codec.c	2317	Analog codec (acodec) driver: the priority target
rv1106_codec.h	n/a	Register/bitfield definitions, copied unmodified
rk_dsm.c	653	Digital speaker modulator (DSM) driver
rk_dsm.h	n/a	Register/bitfield definitions, copied unmodified

Kconfig / Makefile wiring

sound/soc/codecs/Kconfig:

• Added config SND_SOC_RK_DSM (tristate, depends on ARCH_ROCKCHIP || COMPILE_TEST) after SND_SOC_RK817, before SND_SOC_RL6231.
• Added config SND_SOC_RV1106 (tristate, depends on ARCH_ROCKCHIP || COMPILE_TEST, select REGMAP_MMIO) after SND_SOC_RTQ9128, before SND_SOC_SDW_MOCKUP (alphabetical slot for "RV").
• Neither entry restricts to ARM64 (unlike SND_SOC_RK3308's existing depends on ARM64 || COMPILE_TEST in this tree): RV1106 is Cortex-A7 / ARM32-only, so an ARM64 dependency would make the symbol unselectable on this board's ARCH=arm build.

sound/soc/codecs/Makefile (6.18 uses snd-soc-<name>-y := <objs>.o instead of the vendor's snd-soc-<name>-objs := <objs>.o, same semantics, current tree's naming convention followed):

• snd-soc-rk-dsm-y := rk_dsm.o + obj-$(CONFIG_SND_SOC_RK_DSM) += snd-soc-rk-dsm.o
• snd-soc-rv1106-y := rv1106_codec.o + obj-$(CONFIG_SND_SOC_RV1106) += snd-soc-rv1106.o

Config symbols set

Via ./scripts/config --enable <SYMBOL> then make ARCH=arm olddefconfig, confirmed =y in .config afterwards (no silent Kconfig-dependency drops):

CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_SOC=y
CONFIG_SND_SOC_RV1106=y
CONFIG_SND_SOC_RK_DSM=y
CONFIG_SND_SIMPLE_CARD=y
CONFIG_SND_SIMPLE_CARD_UTILS=y
CONFIG_SND_SOC_GENERIC_DMAENGINE_PCM=y   (already y: DMA glue for the DAI)

Note: SOUND/SND/SND_SOC were =m in the pre-port .config (the whole ALSA/ASoC subsystem was module-only). They had to be flipped to =y first: a tristate symbol can't be y while its dependency chain is capped at m; otherwise SND_SOC_RV1106=y would silently clamp to m under olddefconfig, and System.map (built-in symbols only) would show nothing even with grep -c rv1106_codec returning 0, which is exactly the silent-drop failure mode the task asked to guard against. REGMAP_MMIO and MFD_SYSCON were already =y (pulled in by other on-SoC drivers), so no additional dependency chasing was needed for those.

API-delta fixes (5.10 BSP -> 6.18 mainline ASoC)

The vendor 5.10.160 BSP already tracks a fairly modern ASoC callback shape (component-based .probe/.remove, snd_soc_dai_ops with .mute_stream(dai, mute, stream), etc.), so the actual delta surface was small. Six fixes total, all found by iterating single-object builds (make ... sound/soc/codecs/rv1106_codec.o) before doing the full zImage build:

#	File	Change
1	rv1106_codec.c	Dropped #include <linux/rockchip/grf.h>: vendor-BSP-only header, not present in mainline. Nothing in the file actually needs symbols from it: PERI_GRF_PERI_CON1 is defined locally in the driver and the GRF is accessed generically via syscon_regmap_lookup_by_phandle() + regmap_write(). Documented in a comment at the top of the include block.
2	rv1106_codec.c	Replaced #include <linux/of_gpio.h> with #include <linux/gpio/consumer.h>. The driver calls devm_gpiod_get_optional() / gpiod_direction_output() (the gpiod_* consumer API), which live in gpio/consumer.h, not of_gpio.h (legacy integer-GPIO header): this only happened to resolve on 5.10 via a transitive include chain that no longer holds in 6.18.
3	rv1106_codec.c	Added #include <linux/of_device.h>: of_match_device() is declared there, not pulled in transitively by of_platform.h any more; without it the call was an implicit-function-declaration error (-Werror) plus a pointer-from-int warning on the assignment.
4	rv1106_codec.c	snd_soc_get_volsw_range() / snd_soc_put_volsw_range() (used in rv1106_codec_mic_gain_get/put and rv1106_codec_hpmix_gain_get/put) no longer exist as separate mainline entry points: they were folded away when SOC_SINGLE_RANGE/SOC_SINGLE_RANGE_TLV were made simple aliases over SOC_SINGLE_VALUE. The unified snd_soc_get_volsw()/snd_soc_put_volsw() already honour the xmin field of struct soc_mixer_control, so they're a drop-in replacement; confirmed by checking how the affected controls are declared (SOC_SINGLE_EXT_TLV, min=0): behavior is identical. 4 call sites fixed.
5	rv1106_codec.c	SND_SOC_DAIFMT_CBS_CFS -> SND_SOC_DAIFMT_CBC_CFC, SND_SOC_DAIFMT_CBM_CFM -> SND_SOC_DAIFMT_CBP_CFP in rv1106_set_dai_fmt()'s clock-role switch. Mainline renamed the old master/slave (CBM/CBS) constants to the consumer/provider naming (CBC/CBP) some releases back; SND_SOC_DAIFMT_MASTER_MASK itself still exists as a compat alias for CLOCK_PROVIDER_MASK, so only the two case labels needed renaming. Verified the semantic mapping against the branch bodies (codec-slave -> IO_MODE_SLAVE/MODE_SLAVE register bits = consumer = CBC_CFC; codec-master -> ..._MASTER bits = provider = CBP_CFP).
6	rv1106_codec.c + rk_dsm.c	struct platform_driver.remove is void (*remove)(struct platform_device *) in 6.18 (was int (*remove)(struct platform_device *), transitional .remove_new before that). Changed rv1106_platform_remove() and rk_dsm_platform_remove() from static int ... { ...; return 0; } to static void ... (dropped the trailing return 0;). This was an -Werror=incompatible-pointer-types build error, not a warning.

That's the complete fix list: nothing else needed touching. No vendor-only headers other than rockchip/grf.h were pulled in; linux/mfd/syscon.h, linux/reset.h, linux/clk.h, linux/regulator/consumer.h, sound/pcm_params.h, sound/soc.h, sound/tlv.h, sound/dmaengine_pcm.h all exist unchanged in mainline and needed no stubbing.

rk_dsm (digital speaker modulator) decision

Kept in, not dropped. It only needed fix #6 above (the same platform_driver.remove void signature change as the acodec), a one-line-class fix, well under the "drop if it fights the API a lot" threshold in the task brief. SND_SOC_RK_DSM=y is set and rk_dsm.c links cleanly into zImage (17 rk_dsm-prefixed symbols in System.map, including rk_dsm_platform_remove, rk_dsm_hw_params, rk_dsm_set_dai_fmt).

However, the DSM node (dsm: codec-digital@ff340000) and its companion dsm_sound machine card are not wired up in rv1106-warden.dts: &dsm { status = "disabled"; }; is set explicitly, matching the vendor rv1106-luckfox-pico-86panel-ipc.dtsi, which itself ships dsm disabled and dsm_sound as status = "disabled". The 86-Panel's speaker/headphone path is the acodec, not the DSM Class-D path; DSM is present on other RV1106 boards (bare speaker modules) but not this one. The driver is built and available (a future DT change is all that's needed to turn it on) but is not part of this board's active audio graph.

Device tree changes (arch/arm/boot/dts/rockchip/rv1106-warden.dts)

i2s0_8ch was already status = "okay" pre-port (from an earlier "sweep" commit) and already carries #sound-dai-cells = <0> in the base rv1106.dtsi node: no change needed there.

The base rv1106.dtsi acodec: acodec@ff480000 node (mirrored from the vendor's own arch/arm/boot/dts/rv1106.dtsi, which has the same gap) does not carry #sound-dai-cells, unlike i2s0_8ch and dsm, which both already have it in the base dtsi. The vendor board overlay (rv1106-luckfox-pico-86panel-ipc.dtsi) adds it via override, so this port does the same, appended at the end of rv1106-warden.dts after the existing GMAC block:

&acodec {
	#sound-dai-cells = <0>;
	status = "okay";
};

&dsm {
	status = "disabled";
};

/ {
	acodec_sound: acodec-sound {
		compatible = "simple-audio-card";
		simple-audio-card,name = "rv1106-acodec";
		simple-audio-card,format = "i2s";
		simple-audio-card,mclk-fs = <256>;
		simple-audio-card,cpu {
			sound-dai = <&i2s0_8ch>;
		};
		simple-audio-card,codec {
			sound-dai = <&acodec>;
		};
	};
};

Verified against the decompiled built .dtb (dtc -I dtb -O dts):

• acodec@ff480000: status = "okay", #sound-dai-cells = <0x00>, phandle = <0x5a>
• i2s@ffae0000 (i2s0_8ch): status = "okay", #sound-dai-cells = <0x00>, phandle = <0x59>
• codec-digital@ff340000 (dsm): status = "disabled"
• acodec-sound node present with sound-dai = <0x59> (cpu) / sound-dai = <0x5a> (codec): phandles correctly resolve to the i2s0_8ch/acodec nodes above.

Build status

Exact commands run (per the task's build recipe):

export PATH="<flare-edge>/sdk/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin:/usr/bin:/bin"
export ARCH=arm CROSS_COMPILE=arm-rockchip830-linux-uclibcgnueabihf-
cd <flare-edge>/research/linux-6.18.46
make ARCH=arm CROSS_COMPILE=$CROSS_COMPILE zImage rockchip/rv1106-warden.dtb -j"$(nproc)"

Result: exit 0, 0 errors, 0 warnings (a grep -iE "error|warn" over the full build log for both the touched-file single-object builds and the final combined zImage+dtb build returned nothing). arch/arm/boot/zImage and arch/arm/boot/dts/rockchip/rv1106-warden.dtb both produced. XZ compression and the existing console/earlycon config were left untouched.

Verification (build-only, see hardware watch-list below for what's deferred)

Per the task instructions, System.map (produced by the host toolchain's nm, ground truth for built-in linkage, not the cross-nm, which mis-lists symbols) was checked directly with grep:

$ grep -c rv1106_codec System.map
54
$ grep -c rk_dsm System.map
17
$ grep -c soc_codec_dev_rv1106 System.map
1

54 rv1106_codec-prefixed symbols and 17 rk_dsm-prefixed symbols are linked into the kernel image: both drivers are genuinely built in (=y), not silently dropped to module or excluded. soc_codec_dev_rv1106 (the snd_soc_component_driver struct) is present, confirming the component registration path is compiled in.

Hardware-verify watch-list (deferred to the parent session / bench, NOT done here)

This session did not flash or touch any hardware, per the task boundary. When the parent session verifies on a real 86-Panel:

• aplay -l should list a card named rv1106-acodec (from simple-audio-card,name = "rv1106-acodec" in the DT): this is the ALSA card name to look for, not a device path.
• Expect one playback + one capture PCM stream under that card (rv1106-hifi DAI: playback 1-2ch, capture 1-4ch, 8kHz-192kHz, S16_LE/S20_3LE/S24_LE/S32_LE).
• amixer -c <card> controls should surface the vendor mixer controls carried over unchanged from the BSP driver (ADC MIC Left/Right Gain, ADC ALC Left/Right Volume, HPF cutoff, DAC/lineout gain, mic bias, etc.): these are pure regmap register pokes, unaffected by this port's API-shim fixes, so if the card enumerates at all they should already work correctly.
• Watch dmesg for probe-order issues: acodec depends on PCLK_ACODEC, MCLK_ACODEC_TX, MCLK_I2S0_8CH_TX clocks and SRST_P_ACODEC reset all resolving before probe; a probe deferral (-EPROBE_DEFER) once at boot before the CRU driver is up is normal, a permanent failure is not.
• If aplay -l shows no card at all: check dmesg for simple-audio-card DAI-link binding failures first (a #sound-dai-cells mismatch would show as "ASoC: ... error getting cpu/codec dai info" at parse time) before suspecting the codec driver itself, since the DT wiring is the newest/least-proven part of this port.
• The actual audible test (does sound come out of the speaker/headphone jack) is explicitly deferred to the bench: this session only proves the driver builds, links, and the DT graph resolves; it does not and cannot prove the analog output path works on real silicon.

---

Parent-session verify + fix (2026-08-25)

Gap found: the subagent set SND_SOC_RV1106=y + SND_SIMPLE_CARD=y but left the cpu DAI CONFIG_SND_SOC_ROCKCHIP_I2S_TDM=m (module). On the bare-kernel _b boot no modules load, so i2s0_8ch never registered a DAI -> the simple-audio-card stuck in deferred probe pending: asoc-simple-card: parse error, no card. Fix: CONFIG_SND_SOC_ROCKCHIP=y + CONFIG_SND_SOC_ROCKCHIP_I2S_TDM=y (the i2s0_8ch node already carries the rockchip,rv1126-i2s-tdm fallback compatible + #sound-dai-cells=<0>, so the mainline driver binds it).

VERIFIED on c8a3: /proc/asound/cards -> 0 [rv1106acodec]: simple-card - rv1106-acodec; aplay -l -> card 0: rv1106acodec, device 0: ffae0000.i2s-rv1106-hifi; /dev/snd/ has controlC0 pcmC0D0p pcmC0D0c (playback

• capture). Audible speaker test deferred to the bench (with the display).