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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: crepuse.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PS1PPF6469DE8C6.apcprd06.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 53095bbc-3bcf-4d37-aa7f-08df15845f4a X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Sep 2026 12:57:18.8412 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 1d352272-7d70-4a91-9c85-0db444db1bc9 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: pTNbWpQ38ukr0FvBxLCAnxqtu4oRueGsgEhGHvu0i085PEx0Mwlkwvx05kvnRxV0jiWtCNYoa7nlXTAD5lFkoA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYUPR06MB5980 Hi,=0A= =0A= The current RK3308 internal codec driver detects codec revision B=0A= (chip ID 0x3308) but explicitly rejects it. The initial 2022 driver=0A= supported revision B with a monolithic power sequence; the later DAPM=0A= rewrite left it unsupported.=0A= =0A= This RFC restores the revision-specific DAC output VCM/current sequence=0A= as a playback-only DAPM supply shared by HPOUT and LINEOUT. Per-channel=0A= LINEOUT events override the shared DC baseline only while LINEOUT is=0A= enabled. It does not restore the old codec-global power-on/off=0A= functions, and capture-only streams do not touch DAC_ANA_CON14/15.=0A= =0A= The original 2022 upstream v1 selected LINEOUT_FROM_INTERNAL for=0A= revision B even for HPOUT-only playback. A newer Rockchip 6.1=0A= downstream driver instead keeps CON15 at DC_FROM_INTERNAL for=0A= HPOUT-only and selects LINEOUT_FROM_INTERNAL only for LINEOUT or=0A= LINEOUT+HPOUT. This RFC follows the newer behaviour. Is that a hardware=0A= sequencing fix that should be preserved?=0A= =0A= On a DFRobot UNIHIKER M10 V1.2, revision-B probe, the board MICBIAS1=0A= route, capture/playback PCM operation, capture isolation from CON14/15,=0A= and the LINEOUT DAPM/register states were verified with the preceding=0A= clean candidate. Physical onboard microphone capture was also=0A= confirmed. A short transient at capture startup is also present with=0A= the Rockchip vendor driver unless a longer wait is added, so it is not=0A= treated as a regression and this RFC does not add a generic 250 ms mute=0A= delay.=0A= =0A= The shared-output revision is compile-tested but was not deployed.=0A= Physical LINEOUT and HPOUT audio remain untested because suitable=0A= hardware endpoints were unavailable. In particular, the HPOUT-only=0A= CON15=3D0x22 choice still needs maintainer guidance or real-hardware=0A= confirmation.=0A= =0A= The M10 microphone route, its overly broad output topology, microphone PGA= =0A= controls, and capture-startup transient are deliberately kept outside this= =0A= codec RFC.=0A= =0A= Regards,=0A= Mizuno Miotsuki=0A= =0A= Mizuno Miotsuki (1):=0A= ASoC: codecs: rk3308: add support for codec revision B=0A= =0A= sound/soc/codecs/rk3308_codec.c | 102 +++++++++++++++++++++++++++++++-=0A= 1 file changed, 99 insertions(+), 3 deletions(-)=0A= =0A= -- =0A= 2.55.0=0A=