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[177.4.161.167]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-12bede7f542sm13098567c88.14.2026.04.06.18.22.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Apr 2026 18:22:21 -0700 (PDT) From: =?utf-8?q?C=C3=A1ssio_Gabriel?= Date: Mon, 06 Apr 2026 22:22:07 -0300 Subject: [PATCH 1/2] ALSA: tea6330t: add mixer state restore helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260406-alsa-interwave-pm-v1-1-6ffa6f317c8f@gmail.com> References: <20260406-alsa-interwave-pm-v1-0-6ffa6f317c8f@gmail.com> In-Reply-To: <20260406-alsa-interwave-pm-v1-0-6ffa6f317c8f@gmail.com> To: Takashi Iwai , Jaroslav Kysela Cc: linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?C=C3=A1ssio_Gabriel?= X-Mailer: b4 0.15.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2121; i=cassiogabrielcontato@gmail.com; h=from:subject:message-id; bh=z9s/p5PQGu3avNoLNxkLd/+nY7pGFm6czZmVEulcgt8=; b=owGbwMvMwCV2IdZeKur/u2bG02pJDJlXYjwubHR40e0x86aIb1DA7bfLz/IFR668kM17q+moQ SdLZJN2RykLgxgXg6yYIsvqpEWWe7oeXK2PW+EBM4eVCWQIAxenAEykpoiRYUbohYCuOpZJfyY0 FYm1ep34Xuaa9d1fyojpxGHllOOLOBgZ9nhn2/5hsb/D7d0678WxrbuTk7yMdLQ7gpvELrEaMMb yAwA= X-Developer-Key: i=cassiogabrielcontato@gmail.com; a=openpgp; fpr=AB62A239BC8AE0D57F5EA848D05D3F1A5AFFEE83 The InterWave STB variant uses a TEA6330T mixer on its private I2C bus. The mixer state is cached in software, but there is no helper to push that register image back to hardware after system resume. Add a small restore helper that reapplies the cached TEA6330T register image to the device so board drivers can restore the external mixer state as part of their PM resume path. Signed-off-by: Cássio Gabriel --- include/sound/tea6330t.h | 1 + sound/i2c/tea6330t.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/include/sound/tea6330t.h b/include/sound/tea6330t.h index 1c77b78f6533..3a34033d2aa3 100644 --- a/include/sound/tea6330t.h +++ b/include/sound/tea6330t.h @@ -12,5 +12,6 @@ int snd_tea6330t_detect(struct snd_i2c_bus *bus, int equalizer); int snd_tea6330t_update_mixer(struct snd_card *card, struct snd_i2c_bus *bus, int equalizer, int fader); +int snd_tea6330t_restore_mixer(struct snd_i2c_bus *bus); #endif /* __SOUND_TEA6330T_H */ diff --git a/sound/i2c/tea6330t.c b/sound/i2c/tea6330t.c index e8c50a036bea..3e413929d3ea 100644 --- a/sound/i2c/tea6330t.c +++ b/sound/i2c/tea6330t.c @@ -358,3 +358,36 @@ int snd_tea6330t_update_mixer(struct snd_card *card, EXPORT_SYMBOL(snd_tea6330t_detect); EXPORT_SYMBOL(snd_tea6330t_update_mixer); + +int snd_tea6330t_restore_mixer(struct snd_i2c_bus *bus) +{ + struct snd_i2c_device *device; + struct tea6330t *tea; + unsigned char bytes[7]; + unsigned int idx; + int err; + + if (!bus) + return -EINVAL; + + list_for_each_entry(device, &bus->devices, list) { + if (device->addr != TEA6330T_ADDR) + continue; + + tea = device->private_data; + if (!tea) + return -EINVAL; + + snd_i2c_lock(bus); + bytes[0] = TEA6330T_SADDR_VOLUME_LEFT; + for (idx = 0; idx < 6; idx++) + bytes[idx + 1] = tea->regs[idx]; + err = snd_i2c_sendbytes(device, bytes, 7); + snd_i2c_unlock(bus); + + return err < 0 ? err : 0; + } + + return -ENODEV; +} +EXPORT_SYMBOL(snd_tea6330t_restore_mixer); -- 2.53.0