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 X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFC9CC352A3 for ; Mon, 10 Feb 2020 15:14:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C6B812080C for ; Mon, 10 Feb 2020 15:14:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="YJdAgluG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729318AbgBJPO5 (ORCPT ); Mon, 10 Feb 2020 10:14:57 -0500 Received: from lelv0142.ext.ti.com ([198.47.23.249]:34450 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727008AbgBJPO4 (ORCPT ); Mon, 10 Feb 2020 10:14:56 -0500 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 01AFE2sT013007; Mon, 10 Feb 2020 09:14:02 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1581347642; bh=CTOwkFUbIy08mEjbwj0bYGRUO57VUe1/SfMIuhw6a7o=; h=From:To:CC:Subject:Date; b=YJdAgluGxWR+XkmDaVObE+r3ioGNcRp/i1zcMmlGJqDdCzJLM5m68BQC4HYKktbTX YX4ybkkc9sOkJd1j5EEv87GfRzZz+oeOnSFoD0+hZlQpyrIUoGHCQEHN5V24YxwXJN Z26+N3TYLUZPNUzlfJ8GQ6Obx3XyETlDjIoXftlI= Received: from DLEE105.ent.ti.com (dlee105.ent.ti.com [157.170.170.35]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 01AFE2f3064432 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 10 Feb 2020 09:14:02 -0600 Received: from DLEE111.ent.ti.com (157.170.170.22) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Mon, 10 Feb 2020 09:14:02 -0600 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE111.ent.ti.com (157.170.170.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Mon, 10 Feb 2020 09:14:02 -0600 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 01AFDxp6020133; Mon, 10 Feb 2020 09:14:00 -0600 From: Peter Ujfalusi To: , , , CC: , , , Subject: [PATCH v2] ALSA: dmaengine_pcm: Consider DMA cache caused delay in pointer callback Date: Mon, 10 Feb 2020 17:14:02 +0200 Message-ID: <20200210151402.29634-1-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some DMA engines can have big FIFOs which adds to the latency. The DMAengine framework can report the FIFO utilization in bytes. Use this information for the delay reporting. Signed-off-by: Peter Ujfalusi --- Hi, Changes since v1: - use bytes_to_frames() for the DMA delay calculation - Drop changes to soc-pcm 5.6-rc1 now have support for reporting the DMA cached data. With this patch we can include it to the delay calculation. The first DMA driver which reports this is the TI K3 UDMA driver. Regards, Peter sound/core/pcm_dmaengine.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c index 5749a8a49784..d8be7b488162 100644 --- a/sound/core/pcm_dmaengine.c +++ b/sound/core/pcm_dmaengine.c @@ -247,9 +247,14 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { + struct snd_pcm_runtime *runtime = substream->runtime; + buf_size = snd_pcm_lib_buffer_bytes(substream); if (state.residue > 0 && state.residue <= buf_size) pos = buf_size - state.residue; + + runtime->delay = bytes_to_frames(runtime, + state.in_flight_bytes); } return bytes_to_frames(substream->runtime, pos); -- Peter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki