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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 0C32AC433F5 for ; Thu, 23 Sep 2021 10:51:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2BF161164 for ; Thu, 23 Sep 2021 10:51:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240403AbhIWKwb (ORCPT ); Thu, 23 Sep 2021 06:52:31 -0400 Received: from lucky1.263xmail.com ([211.157.147.130]:54052 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240429AbhIWKwa (ORCPT ); Thu, 23 Sep 2021 06:52:30 -0400 Received: from localhost (unknown [192.168.167.16]) by lucky1.263xmail.com (Postfix) with ESMTP id D2885D8002; Thu, 23 Sep 2021 18:50:53 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ADDR-CHECKED4: 1 X-SKE-CHECKED: 1 X-ANTISPAM-LEVEL: 2 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P30982T140487228909312S1632394252895090_; Thu, 23 Sep 2021 18:50:54 +0800 (CST) X-IP-DOMAINF: 1 X-RL-SENDER: sugar.zhang@rock-chips.com X-SENDER: zxg@rock-chips.com X-LOGIN-NAME: sugar.zhang@rock-chips.com X-FST-TO: broonie@kernel.org X-RCPT-COUNT: 12 X-LOCAL-RCPT-COUNT: 1 X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-UNIQUE-TAG: <0073ee5634e02cce322910e426978038> X-System-Flag: 0 From: Sugar Zhang To: broonie@kernel.org, heiko@sntech.de Cc: linux-rockchip@lists.infradead.org, Sugar Zhang , Jaroslav Kysela , Takashi Iwai , Jonathan Corbet , Lars-Peter Clausen , Liam Girdwood , alsa-devel@alsa-project.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ASoC: dmaengine: Introduce module option prealloc_buffer_size_kbytes Date: Thu, 23 Sep 2021 18:50:46 +0800 Message-Id: <1632394246-59341-1-git-send-email-sugar.zhang@rock-chips.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Currently, The fixed 512KB prealloc buffer size is too larger for tiny memory kernel (such as 16MB memory). This patch adds the module option "prealloc_buffer_size_kbytes" to specify prealloc buffer size. It's suitable for cards which use the generic dmaengine pcm driver with no config. Signed-off-by: Sugar Zhang --- Documentation/sound/alsa-configuration.rst | 9 +++++++++ sound/soc/soc-generic-dmaengine-pcm.c | 6 +++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst index 65f6169..34888d4 100644 --- a/Documentation/sound/alsa-configuration.rst +++ b/Documentation/sound/alsa-configuration.rst @@ -100,6 +100,15 @@ amidi_map MIDI device number maps assigned to the 2st OSS device; Default: 1 +Module snd-soc-core +------------------- + +The soc core module. It is used by all ALSA card drivers. +It takes the following options which have global effects. + +prealloc_buffer_size_kbytes + Specify prealloc buffer size in kbytes (default: 512). + Common parameters for top sound card modules -------------------------------------------- diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index 4aa48c7..c54c8ca 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -15,6 +15,10 @@ #include +static unsigned int prealloc_buffer_size_kbytes = 512; +module_param(prealloc_buffer_size_kbytes, uint, 0444); +MODULE_PARM_DESC(prealloc_buffer_size_kbytes, "Preallocate DMA buffer size (KB)."); + /* * The platforms dmaengine driver does not support reporting the amount of * bytes that are still left to transfer. @@ -237,7 +241,7 @@ static int dmaengine_pcm_new(struct snd_soc_component *component, prealloc_buffer_size = config->prealloc_buffer_size; max_buffer_size = config->pcm_hardware->buffer_bytes_max; } else { - prealloc_buffer_size = 512 * 1024; + prealloc_buffer_size = prealloc_buffer_size_kbytes * 1024; max_buffer_size = SIZE_MAX; } -- 2.7.4