From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4B92BC48285 for ; Wed, 31 Jan 2024 08:25:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:Subject:From:MIME-Version:Date:Message-ID: Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=TFVCyZNXJFDOANKxjMa0ZsZNc6uTJe2aRUguUDxn3ds=; b=EzRUedJnFmQbKq sxXBlpZ9Ai9lXl/poZYbc9RFV7B3177oLOuYbgs3gkd398KSIL4/JqP1AqyI/mcFcYFnVxxoTnf2/ 54a+djVvVtlTCR5J+0wr76UGFqWyiPHbMjTML48uhCWsKT6l13BFfILbQu/0gpRU07XF53T6HzXpj M3Er0Rlii5BjMz5/7Z3X44ekttmQKm8+gjBpo2ZPCNTMv4xT155AJgyrULZQj0QgayTzcJ0hLzYW9 WRfTeekMjhEukHcH/AILhky+1cIQ8/TOcJ7nxAXgquUKb633JCZX4siM7SX2rh1U7RMvwHA3a3bH9 9eZ7Ts8imHundhD3uI/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rV5ul-000000025u1-3v9v; Wed, 31 Jan 2024 08:25:47 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rV5uk-000000025tC-3GHk for linux-rockchip@bombadil.infradead.org; Wed, 31 Jan 2024 08:25:46 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:Content-Type :To:Subject:From:MIME-Version:Date:Message-ID:Sender:Reply-To:Cc:Content-ID: Content-Description:In-Reply-To:References; bh=rkiPQ+vOkP3pPhh8RuMV3hwh/H18RvxP+fhLOMlLZPM=; b=CdA1Nh8oVMoFZPK7HhLKC/9QSd 3pmqG7xTH2GDopm/h/jRl7kc5q6OiK/HTa65HiILSyY5AOtz19n2T4mAKGxDpS1noq7qIxcxM93o7 gQ19fe05lFCFFXauUMbOVwQfiCK3Q8jvYkPyg9H0Fyb4y4rM2oH6fC6WepaF5ISxa2FWjsFiPq8mw zWEz1106/H3vj9NziBNJd8xokLqPt4sljBBYwflNyGUANqu9EDA3ziyN563DHRToNi8Z+bOwTVKx7 g+1N4L8KwspkVxV3Y+s2GJi4PDzyJUKAQBSiz1PRHI7vkjTVrfTxmunBE3RSndmDx5m1f7e+YK0O8 Kjz22q6g==; Received: from smtp.ivitera.com ([88.101.85.59]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rV5uh-00000008oyS-16Is for linux-rockchip@lists.infradead.org; Wed, 31 Jan 2024 08:25:45 +0000 Received: from localhost (localhost [127.0.0.1]) by smtp.ivitera.com (Postfix) with ESMTP id EF9CD12B61; Wed, 31 Jan 2024 09:25:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1706689541; bh=tO5NhoozagSwjbc+fk1Ghjoe/kzNdbky8cAkoNrTrmU=; h=Date:From:Subject:To:From; b=jY2FI1gyYFKufrIm7PXyrU/kbWHq2tRJYv6nNtjERTTapmaJ1XTmMVyJqfT2+MPP2 Cvh/kuLNKDZlQLiDbRrP6W8zA8LTrzNiZlvc2WFiVU2eOrpnjDyKytKQ2ormtPNaA0 BQOKMvh2X07lwN5+AUicdnqf+nY2w0hf86a1tb9E= Received: from smtp.ivitera.com ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DMoe5ph4yUJn; Wed, 31 Jan 2024 09:25:41 +0100 (CET) Received: from [192.168.105.22] (dustin.pilsfree.net [81.201.58.138]) (Authenticated sender: pavel) by smtp.ivitera.com (Postfix) with ESMTPSA id 7840D12B5F; Wed, 31 Jan 2024 09:25:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=ivitera.com; s=mail; t=1706689541; bh=tO5NhoozagSwjbc+fk1Ghjoe/kzNdbky8cAkoNrTrmU=; h=Date:From:Subject:To:From; b=jY2FI1gyYFKufrIm7PXyrU/kbWHq2tRJYv6nNtjERTTapmaJ1XTmMVyJqfT2+MPP2 Cvh/kuLNKDZlQLiDbRrP6W8zA8LTrzNiZlvc2WFiVU2eOrpnjDyKytKQ2ormtPNaA0 BQOKMvh2X07lwN5+AUicdnqf+nY2w0hf86a1tb9E= Message-ID: Date: Wed, 31 Jan 2024 09:25:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 From: Pavel Hofman Subject: ASoC: rockchip_i2s_tdm calibration clocking problem To: "alsa-devel@alsa-project.org" , linux-rockchip@lists.infradead.org, Nicolas Frattaroli , Sugar Zhang Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240131_082543_551258_37DAF2A9 X-CRM114-Status: UNSURE ( 9.34 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Hi, I am hitting a clock issue with rockchip_i2s_tdm.c + simple-audio-card (+ RK3308). At boot the mclk clk_i2s0_8ch_tx is (somehow) initialized to some (unimportant?) value 50176000 Hz. Note that this frequency is not multiple of either 48kHz or 44.1kHz. Method asoc_simple_parse_clk() reads this value and sets it to simple_dai->sysclk. Subsequently at asoc_simple_dai_init this "random" initial value is stored to i2s_tdm->mclk_tx_freq: 17.839330] rockchip_i2s_tdm_set_sysclk+0x50/0xbc [snd_soc_rockchip_i2s_tdm] [ 17.839367] snd_soc_dai_set_sysclk+0x38/0xb8 [snd_soc_core] [ 17.839596] asoc_simple_init_dai+0x94/0xc0 [snd_soc_simple_card_utils] [ 17.839640] asoc_simple_dai_init+0x130/0x230 [snd_soc_simple_card_utils] [ 17.839672] snd_soc_link_init+0x28/0x90 [snd_soc_core] [ 17.839843] snd_soc_bind_card+0x60c/0xbb4 [snd_soc_core] When starting playback, called by rockchip_i2s_tdm_hw_params(), rockchip_i2s_tdm_calibrate_mclk() correctly switches parent of mclk_parent to correct root pll clock mclk_root0/1 for the given samplerate and correctly configures mclk_parent frequency. https://github.com/torvalds/linux/blob/master/sound/soc/rockchip/rockchip_i2s_tdm.c#L862-L864 But right after that, the next line of rockchip_i2s_tdm_hw_params() calls rockchip_i2s_tdm_set_mclk() https://github.com/torvalds/linux/blob/master/sound/soc/rockchip/rockchip_i2s_tdm.c#L866C9-L866C34 This method calls clk_set_rate(i2s_tdm->mclk_tx, i2s_tdm->mclk_tx_freq), which resets the clock and its parental chain to the original incorrect value stored in i2s_tdm->mclk_tx_freq from the dai initialization. https://github.com/torvalds/linux/blob/master/sound/soc/rockchip/rockchip_i2s_tdm.c#L693 As a result, no matter what sample rate is being played, the i2s mclk clock always ends up configured incorrectly. DTS I2S sets all clocks, therefore the clk calibration in rockchip_i2s_tdm.c should be (and is) used: i2s_8ch_0: i2s@ff300000 { compatible = "rockchip,rk3308-i2s-tdm"; reg = <0x0 0xff300000 0x0 0x1000>; interrupts = ; clocks = <&cru SCLK_I2S0_8CH_TX>, <&cru SCLK_I2S0_8CH_RX>, <&cru HCLK_I2S0_8CH>, <&cru SCLK_I2S0_8CH_TX_SRC>, <&cru SCLK_I2S0_8CH_RX_SRC>, <&cru PLL_VPLL0>, <&cru PLL_VPLL1>; clock-names = "mclk_tx", "mclk_rx", "hclk", "mclk_tx_src", "mclk_rx_src", "mclk_root0", "mclk_root1"; ......... It seems to me that the calibration code should also rewrite the initially incorrect i2s_tdm->mclk_tx_freq and i2s_tdm->mclk_rx_freq with correct values corresponding to the momentary hw_params rate, or maybe rockchip_i2s_tdm_set_mclk() should not be called if rockchip_i2s_tdm_calibrate_mclk() is called a line above (i.e. putting the call to rockchip_i2s_tdm_set_mclk() into "else" branch). Thank you very much for help. With regards, Pavel. _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip