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44 lines
1.7 KiB
Diff
44 lines
1.7 KiB
Diff
From 5cddc22049efb7e7aa5382ce789379c943170187 Mon Sep 17 00:00:00 2001
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From: Jerome Brunet <jbrunet@baylibre.com>
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Date: Fri, 23 Feb 2024 18:51:07 +0100
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Subject: [PATCH 29/53] FROMLIST(v1): ASoC: meson: axg-tdm-interface: fix mclk
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setup without mclk-fs
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By default, when mclk-fs is not provided, the tdm-interface driver
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requests an MCLK that is 4x the bit clock, SCLK.
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However there is no justification for this:
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* If the codec needs MCLK for its operation, mclk-fs is expected to be set
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according to the codec requirements.
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* If the codec does not need MCLK the minimum is 2 * SCLK, because this is
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minimum the divider between SCLK and MCLK can do.
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Multiplying by 4 may cause problems because the PLL limit may be reached
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sooner than it should, so use 2x instead.
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Fixes: d60e4f1e4be5 ("ASoC: meson: add tdm interface driver")
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Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
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---
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sound/soc/meson/axg-tdm-interface.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/sound/soc/meson/axg-tdm-interface.c b/sound/soc/meson/axg-tdm-interface.c
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index 1c3d433cefd2..cd5168e826df 100644
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--- a/sound/soc/meson/axg-tdm-interface.c
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+++ b/sound/soc/meson/axg-tdm-interface.c
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@@ -264,8 +264,8 @@ static int axg_tdm_iface_set_sclk(struct snd_soc_dai *dai,
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srate = iface->slots * iface->slot_width * params_rate(params);
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if (!iface->mclk_rate) {
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- /* If no specific mclk is requested, default to bit clock * 4 */
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- clk_set_rate(iface->mclk, 4 * srate);
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+ /* If no specific mclk is requested, default to bit clock * 2 */
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+ clk_set_rate(iface->mclk, 2 * srate);
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} else {
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/* Check if we can actually get the bit clock from mclk */
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if (iface->mclk_rate % srate) {
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--
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2.34.1
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