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[104.199.160.21]) by smtp.gmail.com with ESMTPSA id n9-20020aa79849000000b005769ccca18csm9215193pfq.85.2022.12.08.00.42.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Dec 2022 00:42:17 -0800 (PST) From: Judy Hsiao To: srinivas.kandagatla@linaro.org, bgoswami@codeaurora.org, lgirdwood@gmail.com, broonie@kernel.org Subject: [PATCH v1] ASoC: qcom: lpass-platform: Use SNDRV_DMA_TYPE_NONCOHERENT page allocation Date: Thu, 8 Dec 2022 08:42:00 +0000 Message-Id: <20221208084200.2136311-1-judyhsiao@chromium.org> X-Mailer: git-send-email 2.39.0.rc0.267.gcb52ba06e7-goog MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, tiwai@suse.com, Banajit Goswami , Judy Hsiao X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Replace SNDRV_DMA_TYPE_DEV by SNDRV_DMA_TYPE_NONCOHERENT for pcm buffer allocation. We measured about 18x performance improvement when accessing the snd_pcm_mmap() buffer from userspace. Eg: aarch64 with internal speaker == SNDRV_DMA_TYPE_DEV frames_per_second=66.4557M/s max_time_per_4096_frames=106.094u time_per_4096_frames=61.6351us SNDRV_DMA_TYPE_NONCOHERENT frames_per_second=1028.58M/s max_time_per_4096_frames=20.312u time_per_4096_frames=3.98221us Signed-off-by: Judy Hsiao --- sound/soc/qcom/lpass-platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c index b41ab7a321ae..ef5cb40b2d9b 100644 --- a/sound/soc/qcom/lpass-platform.c +++ b/sound/soc/qcom/lpass-platform.c @@ -1181,7 +1181,7 @@ static int lpass_platform_pcm_new(struct snd_soc_component *component, if (is_cdc_dma_port(dai_id)) return lpass_platform_prealloc_cdc_dma_buffer(component, pcm, dai_id); - return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, + return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_NONCOHERENT, component->dev, size); }