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Fri, 13 Mar 2026 19:32:41 -0700 (PDT) From: James Calligeros To: Mark Brown Cc: Liam Girdwood , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Kuninori Morimoto , Shengjiu Wang , Jaroslav Kysela , Takashi Iwai , Shenghao Ding , Kevin Lu , Baojun Xu , Frank Li , linux-sound@vger.kernel.org, devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, asahi@lists.linux.dev Subject: Re: [PATCH v3 7/7] ASoC: tas2770: expose SDOUT bus keeper via set_tdm_idle Date: Sat, 14 Mar 2026 12:32:26 +1000 Message-ID: <5796105.LvFx2qVVIh@setsuna> In-Reply-To: <6a3cc78a-77bc-473e-bfbf-caffbe8f25bb@sirena.org.uk> References: <20260301-tdm-idle-slots-v3-0-c6ac5351489a@gmail.com> <20260301-tdm-idle-slots-v3-7-c6ac5351489a@gmail.com> <6a3cc78a-77bc-473e-bfbf-caffbe8f25bb@sirena.org.uk> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Friday, 13 March 2026 12:33:05=E2=80=AFam Australian Eastern Standard Ti= me Mark Brown wrote: > On Sun, Mar 01, 2026 at 06:05:26PM +1000, James Calligeros wrote: > > +static int tas2770_set_dai_tdm_idle(struct snd_soc_dai *dai, > > + unsigned int tx_mask, > > + unsigned int rx_mask, > > + int tx_mode, int rx_mode) > > +{ > >=20 > > + switch (tx_mode) { > > + case SND_SOC_DAI_TDM_IDLE_PULLDOWN: > > + ret =3D snd_soc_component_update_bits(component, TAS2770_DIN_PD, > > + TAS2770_DIN_PD_SDOUT, > > + TAS2770_DIN_PD_SDOUT); > > + if (ret) > > + return ret; > > + > > + break; >=20 > This and all the other cases only updates the bits it's specifically > setting for the mode, so _ZERO and _HIZ don't update the pull and this > doesn't update the _KEEP/_FILL settings. Not sure how often anyone is > going to change this at runtime though. I didn't notice any side effects caused by not explicitly turning off the weak pulldown, but it makes sense to do if the consumer has asked for a mode that is not pulldown. > > + case SND_SOC_DAI_TDM_IDLE_OFF: > > + ret =3D snd_soc_component_update_bits(component, TAS2770_DIN_PD, > > + TAS2770_DIN_PD_SDOUT, 0); > > + if (ret) > > + return ret; > > + > > + ret =3D snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG= 4, > > + TAS2770_TDM_CFG_REG4_TX_KEEPER, 0); >=20 > Actually this does _KEEP but not _FILL. _KEEPER is the important one. _FILL just controls the behaviour of the bus keeper (zero or Hi-Z) when _KEEPER is set. If _KEEPER is cleared, the bus keeper is turned off and the value of _FILL doesn't matter.