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 C7E3C19D074; Thu, 25 Jul 2024 14:52:27 +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=1721919147; cv=none; b=reBVfBdszP4E1wlAX7hB5i8nhxLm9ueHy4GfSfu6OKAUZv7qBQVeOae0Vsroav+6Ihie/7/av3uIOYFl9oQ2ew6omDXsCvInoXcX2Dl+Sa2D66UP+VCtnIzGOaOrD/AW8rFYhvCGBQDVS1Hbc+vixvPtMlXJKnmmz5KNUJ4Ybqw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721919147; c=relaxed/simple; bh=Aubh2E17B4zUihaWIHwKPsFVd6jEDwheUl+OEvgTI7s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G6mQY3UOXQydg0Ek2OXf+uiVlF/lcdImEvonxrWqbsZoLuwWEuWjUCcE+wAHNTayx9Gs/Zx6SvvsX1jPeXLDgEmxWmoL4VGGLrxhTv02vIllFwpIUNWkKtS6XmVqMaqQ0E8mH+1AA/zCAa0NMJb22bcdQQooauYjMchzf8tnmAQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=D3d5T6XK; 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="D3d5T6XK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48FDFC116B1; Thu, 25 Jul 2024 14:52:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721919147; bh=Aubh2E17B4zUihaWIHwKPsFVd6jEDwheUl+OEvgTI7s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D3d5T6XK1OwbSaNc/9xwaHej1cmtxLmhdgZRxqWrj0ueLKfiX1OnCBmoCWamom8oe 0UyczTi7u286/I5CKXt5Uld02HpX64yEqE1bbCKn60OQ85yGNj5HuiRWTNC07D7jtB 3UyZL2MHZzfgNOCBlkKR45QY2GhvwKmc4033dwuY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peter Ujfalusi , Jai Luthra , Mark Brown , Sasha Levin Subject: [PATCH 5.15 39/87] ALSA: dmaengine: Synchronize dma channel after drop() Date: Thu, 25 Jul 2024 16:37:12 +0200 Message-ID: <20240725142739.908520249@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240725142738.422724252@linuxfoundation.org> References: <20240725142738.422724252@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jai Luthra [ Upstream commit e8343410ddf08fc36a9b9cc7c51a4e53a262d4c6 ] Sometimes the stream may be stopped due to XRUN events, in which case the userspace can call snd_pcm_drop() and snd_pcm_prepare() to stop and start the stream again. In these cases, we must wait for the DMA channel to synchronize before marking the stream as prepared for playback, as the DMA channel gets stopped by drop() without any synchronization. Make sure the ALSA core synchronizes the DMA channel by adding a sync_stop() hook. Reviewed-by: Peter Ujfalusi Signed-off-by: Jai Luthra Link: https://lore.kernel.org/r/20240611-asoc_next-v3-1-fcfd84b12164@ti.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- include/sound/dmaengine_pcm.h | 1 + sound/core/pcm_dmaengine.c | 10 ++++++++++ sound/soc/soc-generic-dmaengine-pcm.c | 8 ++++++++ 3 files changed, 19 insertions(+) diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index 96666efddb396..6d9c94a570733 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h @@ -34,6 +34,7 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, struct dma_chan *chan); int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); +int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream); int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data); diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 0fe93b423c4ed..3e479dca122a0 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -344,6 +344,16 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); +int snd_dmaengine_pcm_sync_stop(struct snd_pcm_substream *substream) +{ + struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); + + dmaengine_synchronize(prtd->dma_chan); + + return 0; +} +EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_sync_stop); + /** * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream * @substream: PCM substream diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index 4aa48c74f21a0..fa1f91c34834f 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -323,6 +323,12 @@ static int dmaengine_copy_user(struct snd_soc_component *component, return 0; } +static int dmaengine_pcm_sync_stop(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_sync_stop(substream); +} + static const struct snd_soc_component_driver dmaengine_pcm_component = { .name = SND_DMAENGINE_PCM_DRV_NAME, .probe_order = SND_SOC_COMP_ORDER_LATE, @@ -332,6 +338,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component = { .trigger = dmaengine_pcm_trigger, .pointer = dmaengine_pcm_pointer, .pcm_construct = dmaengine_pcm_new, + .sync_stop = dmaengine_pcm_sync_stop, }; static const struct snd_soc_component_driver dmaengine_pcm_component_process = { @@ -344,6 +351,7 @@ static const struct snd_soc_component_driver dmaengine_pcm_component_process = { .pointer = dmaengine_pcm_pointer, .copy_user = dmaengine_copy_user, .pcm_construct = dmaengine_pcm_new, + .sync_stop = dmaengine_pcm_sync_stop, }; static const char * const dmaengine_pcm_dma_channel_names[] = { -- 2.43.0