From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 32B753D6494; Fri, 24 Apr 2026 13:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777037673; cv=none; b=Gd9Q32u7R4BstkIgnU46AawVKpTXrsmTgm3mauqWdQhoW62pQgyoPbbqeSR/al9RHTiARJvaH+dy+2BjpXXgbK7NSfASf5JWEBX7CZ3vM7AgMLyrPYPfzp9b7Eq298j4TnYApb23+9+IZI+C5JVBrr4o1lcKci8hijuh8+D4yfI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777037673; c=relaxed/simple; bh=7ibYX6WAPaWKS/fGCRPZA183h3afLiynRwHyTQfvF1g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ncJgnCVpgA/V9qES0iBkjxTyR08sNB+bvIVK+VaEFFUT3jwi+PukE2OkwRhjUjoqa5oYYkgDfhkdT46AiaVWMQTq75nzdKIJfJgewP0hqcnm8Fjfj7aauQjaHo0UD83VFBsKuRNUyOKMKM7B11zGam6EHlcU6kwA4wWiBssn8Hg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nZ4qgmr/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nZ4qgmr/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7FCD6C19425; Fri, 24 Apr 2026 13:34:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777037672; bh=7ibYX6WAPaWKS/fGCRPZA183h3afLiynRwHyTQfvF1g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nZ4qgmr/aXkxpj7DxuEK1Q3BLCH4IRci6g7avQV7D4mHYomVgZxLHAbAN/Cyy2tWU cqHZhXDESFpzDJc1pz6PAD0WazfRxpCka8k38fxSVXWXTLezBjAL1gaHJPXkug+wMh 6in2HHXSG+oVoYGLod4Ykl7E7j0eih5piIP3A9u0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tomasz Merta , Mark Brown , Sasha Levin Subject: [PATCH 6.6 026/166] ASoC: stm32_sai: fix incorrect BCLK polarity for DSP_A/B, LEFT_J Date: Fri, 24 Apr 2026 15:29:00 +0200 Message-ID: <20260424132538.294051671@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260424132532.812258529@linuxfoundation.org> References: <20260424132532.812258529@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tomasz Merta [ Upstream commit 0669631dbccd41cf3ca7aa70213fcd8bb41c4b38 ] The STM32 SAI driver do not set the clock strobing bit (CKSTR) for DSP_A, DSP_B and LEFT_J formats, causing data to be sampled on the wrong BCLK edge when SND_SOC_DAIFMT_NB_NF is used. Per ALSA convention, NB_NF requires sampling on the rising BCLK edge. The STM32MP25 SAI reference manual states that CKSTR=1 is required for signals received by the SAI to be sampled on the SCK rising edge. Without setting CKSTR=1, the SAI samples on the falling edge, violating the NB_NF convention. For comparison, the NXP FSL SAI driver correctly sets FSL_SAI_CR2_BCP for DSP_A, DSP_B and LEFT_J, consistent with its I2S handling. This patch adds SAI_XCR1_CKSTR for DSP_A, DSP_B and LEFT_J in stm32_sai_set_dai_fmt which was verified empirically with a cs47l35 codec. RIGHT_J (LSB) is not investigated and addressed by this patch. Note: the STM32 I2S driver (stm32_i2s_set_dai_fmt) may have the same issue for DSP_A mode, as I2S_CGFR_CKPOL is not set. This has not been verified and is left for a separate investigation. Signed-off-by: Tomasz Merta Link: https://patch.msgid.link/20260408084056.20588-1-tommerta@gmail.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/stm/stm32_sai_sub.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c index c47f23634e957..03788bd869197 100644 --- a/sound/soc/stm/stm32_sai_sub.c +++ b/sound/soc/stm/stm32_sai_sub.c @@ -677,6 +677,7 @@ static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) break; /* Left justified */ case SND_SOC_DAIFMT_MSB: + cr1 |= SAI_XCR1_CKSTR; frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF; break; /* Right justified */ @@ -684,9 +685,11 @@ static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF; break; case SND_SOC_DAIFMT_DSP_A: + cr1 |= SAI_XCR1_CKSTR; frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF; break; case SND_SOC_DAIFMT_DSP_B: + cr1 |= SAI_XCR1_CKSTR; frcr |= SAI_XFRCR_FSPOL; break; default: -- 2.53.0