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Fri, 18 Sep 2026 12:57:19 +0000 Received: from PS1PPF6469DE8C6.apcprd06.prod.outlook.com ([fe80::e60a:2617:6895:a0cf]) by PS1PPF6469DE8C6.apcprd06.prod.outlook.com ([fe80::e60a:2617:6895:a0cf%6]) with mapi id 15.21.0406.007; Fri, 18 Sep 2026 12:57:18 +0000 From: Mizuno Miotsuki To: Luca Ceresoli , Mark Brown CC: Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Heiko Stuebner , "linux-sound@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-rockchip@lists.infradead.org" Subject: [RFC PATCH 0/1] ASoC: codecs: rk3308: add support for codec revision B Thread-Topic: [RFC PATCH 0/1] ASoC: codecs: rk3308: add support for codec revision B Thread-Index: AQHdR2084WOWJLbj5kaUO71XLMNpEA== Date: Fri, 18 Sep 2026 12:57:18 +0000 Message-ID: <20260918125711.94361-1-founder@crepuse.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=crepuse.com; 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X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Hi, The current RK3308 internal codec driver detects codec revision B (chip ID 0x3308) but explicitly rejects it. The initial 2022 driver supported revision B with a monolithic power sequence; the later DAPM rewrite left it unsupported. This RFC restores the revision-specific DAC output VCM/current sequence as a playback-only DAPM supply shared by HPOUT and LINEOUT. Per-channel LINEOUT events override the shared DC baseline only while LINEOUT is enabled. It does not restore the old codec-global power-on/off functions, and capture-only streams do not touch DAC_ANA_CON14/15. The original 2022 upstream v1 selected LINEOUT_FROM_INTERNAL for revision B even for HPOUT-only playback. A newer Rockchip 6.1 downstream driver instead keeps CON15 at DC_FROM_INTERNAL for HPOUT-only and selects LINEOUT_FROM_INTERNAL only for LINEOUT or LINEOUT+HPOUT. This RFC follows the newer behaviour. Is that a hardware sequencing fix that should be preserved? On a DFRobot UNIHIKER M10 V1.2, revision-B probe, the board MICBIAS1 route, capture/playback PCM operation, capture isolation from CON14/15, and the LINEOUT DAPM/register states were verified with the preceding clean candidate. Physical onboard microphone capture was also confirmed. A short transient at capture startup is also present with the Rockchip vendor driver unless a longer wait is added, so it is not treated as a regression and this RFC does not add a generic 250 ms mute delay. The shared-output revision is compile-tested but was not deployed. Physical LINEOUT and HPOUT audio remain untested because suitable hardware endpoints were unavailable. In particular, the HPOUT-only CON15=0x22 choice still needs maintainer guidance or real-hardware confirmation. The M10 microphone route, its overly broad output topology, microphone PGA controls, and capture-startup transient are deliberately kept outside this codec RFC. Regards, Mizuno Miotsuki Mizuno Miotsuki (1): ASoC: codecs: rk3308: add support for codec revision B sound/soc/codecs/rk3308_codec.c | 102 +++++++++++++++++++++++++++++++- 1 file changed, 99 insertions(+), 3 deletions(-) -- 2.55.0 _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip