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Fri, 23 Feb 2024 09:51:22 -0800 (PST) Received: from toaster.lan ([2a01:e0a:3c5:5fb1:e8a0:25a6:d4ec:a7ff]) by smtp.googlemail.com with ESMTPSA id bo10-20020a056000068a00b0033cddadde6esm3711524wrb.80.2024.02.23.09.51.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Feb 2024 09:51:22 -0800 (PST) From: Jerome Brunet To: Mark Brown , Liam Girdwood Cc: Jerome Brunet , 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 Message-ID: <20240223175116.2005407-2-jbrunet@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240223175116.2005407-1-jbrunet@baylibre.com> References: <20240223175116.2005407-1-jbrunet@baylibre.com> MIME-Version: 1.0 X-Patchwork-Bot: notify Message-ID-Hash: ITRSFI7UVHCA2JYYWHMVJLXQWOFPLTY2 X-Message-ID-Hash: ITRSFI7UVHCA2JYYWHMVJLXQWOFPLTY2 X-MailFrom: jbrunet@baylibre.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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 --- 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) {