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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2605AC678D5 for ; Tue, 7 Mar 2023 17:34:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231672AbjCGReM (ORCPT ); Tue, 7 Mar 2023 12:34:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231731AbjCGRdx (ORCPT ); Tue, 7 Mar 2023 12:33:53 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 955359CFD6 for ; Tue, 7 Mar 2023 09:29:25 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 349ED61517 for ; Tue, 7 Mar 2023 17:29:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43707C433EF; Tue, 7 Mar 2023 17:29:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678210164; bh=NhGsBGoqTdT0I8zUJPQxubvxLRtXHbikPeSRWymwZAA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z/J7RrmuK33F0e2yjqvfwBvd1yHGjsuMcWYTbeSNTLgKjRJFRWzR1YNzNC+r2DivQ 4PMyDONoLZ9SuSYC/qATuuCwyNPdrviZqBqE/zN+EdtCcECsifQAmLJWg6ofjUmgJ2 PgpUg4vzSKmUWwVVxMR7Jn6XWt/ZidNtrs10ZxtQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Srinivas Kandagatla , Mark Brown , Sasha Levin Subject: [PATCH 6.2 0426/1001] ASoC: qcom: q6apm-dai: Add SNDRV_PCM_INFO_BATCH flag Date: Tue, 7 Mar 2023 17:53:18 +0100 Message-Id: <20230307170039.845280458@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Srinivas Kandagatla [ Upstream commit aa759f3f9f4394a3af65ad1772fca6cb9dd9e4cc ] At the moment, playing audio with PulseAudio with the qdsp6 driver results in distorted sound. It seems like its timer-based scheduling does not work properly with qdsp6 since setting tsched=0 in the PulseAudio configuration avoids the issue. Apparently this happens when the pointer() callback is not accurate enough. There is a SNDRV_PCM_INFO_BATCH flag that can be used to stop PulseAudio from using timer-based scheduling by default. According to https://www.alsa-project.org/pipermail/alsa-devel/2014-March/073816.html: The flag is being used in the sense explained in the previous audio meeting -- the data transfer granularity isn't fine enough but aligned to the period size (or less). q6apm-dai reports the position as multiple of prtd->pcm_count = snd_pcm_lib_period_bytes(substream) so it indeed just a multiple of the period size. Therefore adding the flag here seems appropriate and makes audio work out of the box. Comment log inspired by Stephan Gerhold sent for q6asm-dai.c few years back. Fixes: 9b4fe0f1cd79 ("ASoC: qdsp6: audioreach: add q6apm-dai support") Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20230209122806.18923-4-srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/qcom/qdsp6/q6apm-dai.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sound/soc/qcom/qdsp6/q6apm-dai.c b/sound/soc/qcom/qdsp6/q6apm-dai.c index bd35067a40521..7f02f5b2c33fd 100644 --- a/sound/soc/qcom/qdsp6/q6apm-dai.c +++ b/sound/soc/qcom/qdsp6/q6apm-dai.c @@ -64,7 +64,8 @@ struct q6apm_dai_data { static struct snd_pcm_hardware q6apm_dai_hardware_capture = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | - SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), + SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_BATCH), .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE), .rates = SNDRV_PCM_RATE_8000_48000, .rate_min = 8000, @@ -82,7 +83,8 @@ static struct snd_pcm_hardware q6apm_dai_hardware_capture = { static struct snd_pcm_hardware q6apm_dai_hardware_playback = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | - SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), + SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_BATCH), .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE), .rates = SNDRV_PCM_RATE_8000_192000, .rate_min = 8000, -- 2.39.2