From: Jerome Brunet <jbrunet@baylibre.com> To: Mark Brown <broonie@kernel.org>, Liam Girdwood <lgirdwood@gmail.com> Cc: Jerome Brunet <jbrunet@baylibre.com>, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org Subject: [PATCH 1/6] ASoC: meson: axg-tdm-interface: fix mclk setup without mclk-fs Date: Fri, 23 Feb 2024 18:51:07 +0100 [thread overview] Message-ID: <20240223175116.2005407-2-jbrunet@baylibre.com> (raw) In-Reply-To: <20240223175116.2005407-1-jbrunet@baylibre.com> By default, when mclk-fs is not provided, the tdm-interface driver requests an MCLK that is 4x the bit clock, SCLK. However there is no justification for this: * If the codec needs MCLK for its operation, mclk-fs is expected to be set according to the codec requirements. * If the codec does not need MCLK the minimum is 2 * SCLK, because this is minimum the divider between SCLK and MCLK can do. Multiplying by 4 may cause problems because the PLL limit may be reached sooner than it should, so use 2x instead. Fixes: d60e4f1e4be5 ("ASoC: meson: add tdm interface driver") Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/meson/axg-tdm-interface.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/soc/meson/axg-tdm-interface.c b/sound/soc/meson/axg-tdm-interface.c index 1c3d433cefd2..cd5168e826df 100644 --- a/sound/soc/meson/axg-tdm-interface.c +++ b/sound/soc/meson/axg-tdm-interface.c @@ -264,8 +264,8 @@ static int axg_tdm_iface_set_sclk(struct snd_soc_dai *dai, srate = iface->slots * iface->slot_width * params_rate(params); if (!iface->mclk_rate) { - /* If no specific mclk is requested, default to bit clock * 4 */ - clk_set_rate(iface->mclk, 4 * srate); + /* If no specific mclk is requested, default to bit clock * 2 */ + clk_set_rate(iface->mclk, 2 * srate); } else { /* Check if we can actually get the bit clock from mclk */ if (iface->mclk_rate % srate) { -- 2.43.0
WARNING: multiple messages have this Message-ID (diff)
From: Jerome Brunet <jbrunet@baylibre.com> To: Mark Brown <broonie@kernel.org>, Liam Girdwood <lgirdwood@gmail.com> Cc: Jerome Brunet <jbrunet@baylibre.com>, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org Subject: [PATCH 1/6] ASoC: meson: axg-tdm-interface: fix mclk setup without mclk-fs Date: Fri, 23 Feb 2024 18:51:07 +0100 [thread overview] Message-ID: <20240223175116.2005407-2-jbrunet@baylibre.com> (raw) In-Reply-To: <20240223175116.2005407-1-jbrunet@baylibre.com> By default, when mclk-fs is not provided, the tdm-interface driver requests an MCLK that is 4x the bit clock, SCLK. However there is no justification for this: * If the codec needs MCLK for its operation, mclk-fs is expected to be set according to the codec requirements. * If the codec does not need MCLK the minimum is 2 * SCLK, because this is minimum the divider between SCLK and MCLK can do. Multiplying by 4 may cause problems because the PLL limit may be reached sooner than it should, so use 2x instead. Fixes: d60e4f1e4be5 ("ASoC: meson: add tdm interface driver") Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/meson/axg-tdm-interface.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/soc/meson/axg-tdm-interface.c b/sound/soc/meson/axg-tdm-interface.c index 1c3d433cefd2..cd5168e826df 100644 --- a/sound/soc/meson/axg-tdm-interface.c +++ b/sound/soc/meson/axg-tdm-interface.c @@ -264,8 +264,8 @@ static int axg_tdm_iface_set_sclk(struct snd_soc_dai *dai, srate = iface->slots * iface->slot_width * params_rate(params); if (!iface->mclk_rate) { - /* If no specific mclk is requested, default to bit clock * 4 */ - clk_set_rate(iface->mclk, 4 * srate); + /* If no specific mclk is requested, default to bit clock * 2 */ + clk_set_rate(iface->mclk, 2 * srate); } else { /* Check if we can actually get the bit clock from mclk */ if (iface->mclk_rate % srate) { -- 2.43.0 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic
next prev parent reply other threads:[~2024-02-23 17:51 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-23 17:51 [PATCH 0/6] ASoC: meson: axg fixes and clean-up Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet [this message] 2024-02-23 17:51 ` [PATCH 1/6] ASoC: meson: axg-tdm-interface: fix mclk setup without mclk-fs Jerome Brunet 2024-02-23 17:51 ` [PATCH 2/6] ASoC: meson: axg-tdm-interface: add frame rate constraint Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-23 17:51 ` [PATCH 3/6] ASoC: meson: axg-tdm-interface: update error format error traces Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-23 17:51 ` [PATCH 4/6] ASoC: meson: axg-spdifin: use max width for rate detection Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-23 17:51 ` [PATCH 5/6] ASoC: meson: axg-fifo: take continuous rates Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-23 17:51 ` [PATCH 6/6] ASoC: meson: axg-fifo: use FIELD helpers Jerome Brunet 2024-02-23 17:51 ` Jerome Brunet 2024-02-26 15:42 ` Mark Brown 2024-02-26 15:42 ` Mark Brown 2024-02-26 18:15 ` Jerome Brunet 2024-02-26 18:15 ` Jerome Brunet 2024-02-26 18:22 ` Mark Brown 2024-02-26 18:22 ` Mark Brown 2024-02-26 19:28 ` [PATCH 0/6] ASoC: meson: axg fixes and clean-up Mark Brown 2024-02-26 19:28 ` Mark Brown
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