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[23.128.96.18]) by mx.google.com with ESMTP id lu18si1494898ejb.482.2020.05.20.02.44.32; Wed, 20 May 2020 02:44:55 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726789AbgETJnK (ORCPT + 99 others); Wed, 20 May 2020 05:43:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726224AbgETJnK (ORCPT ); Wed, 20 May 2020 05:43:10 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 222B6C061A0E for ; Wed, 20 May 2020 02:43:10 -0700 (PDT) Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=localhost) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jbLFF-0005cD-JY; Wed, 20 May 2020 11:42:37 +0200 Message-ID: <53258cd99caaf1199036737f8fad6cc097939567.camel@pengutronix.de> Subject: Re: [PATCH] ASoC: fsl: imx-pcm-dma: Don't request dma channel in probe From: Lucas Stach To: Shengjiu Wang Cc: Shengjiu Wang , Timur Tabi , Nicolin Chen , Xiubo Li , Fabio Estevam , Liam Girdwood , Mark Brown , perex@perex.cz, Takashi Iwai , shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, linux-imx@nxp.com, sumit.semwal@linaro.org, Linux-ALSA , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Date: Wed, 20 May 2020 11:42:32 +0200 In-Reply-To: References: <1589881301-4143-1-git-send-email-shengjiu.wang@nxp.com> <0866cd8cdb0c22f0b2a6814c4dafa29202aad5f3.camel@pengutronix.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.2 (3.36.2-1.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Mittwoch, den 20.05.2020, 16:20 +0800 schrieb Shengjiu Wang: > Hi > > On Tue, May 19, 2020 at 6:04 PM Lucas Stach wrote: > > Am Dienstag, den 19.05.2020, 17:41 +0800 schrieb Shengjiu Wang: > > > There are two requirements that we need to move the request > > > of dma channel from probe to open. > > > > How do you handle -EPROBE_DEFER return code from the channel request if > > you don't do it in probe? > > I use the dma_request_slave_channel or dma_request_channel instead > of dmaengine_pcm_request_chan_of. so there should be not -EPROBE_DEFER > return code. This is a pretty weak argument. The dmaengine device might probe after you try to get the channel. Using a function to request the channel that doesn't allow you to handle probe deferral is IMHO a bug and should be fixed, instead of building even more assumptions on top of it. > > > - When dma device binds with power-domains, the power will > > > be enabled when we request dma channel. If the request of dma > > > channel happen on probe, then the power-domains will be always > > > enabled after kernel boot up, which is not good for power > > > saving, so we need to move the request of dma channel to .open(); > > > > This is certainly something which could be fixed in the dmaengine > > driver. > > Dma driver always call the pm_runtime_get_sync in > device_alloc_chan_resources, the device_alloc_chan_resources is > called when channel is requested. so power is enabled on channel > request. So why can't you fix the dmaengine driver to do that RPM call at a later time when the channel is actually going to be used? This will allow further power savings with other slave devices than the audio PCM. Regards, Lucas > > > - With FE-BE case, if the dma channel is requested in probe, > > > then there will be below issue, which is caused by that the > > > dma channel will be requested duplicately > > > > Why is this requested a second time? Is this just some missing cleanup > > on a deferred probe path? > > Not relate with deferred probe. With DMA1->ASRC->DMA2->ESAI case, > the DMA1->ASRC->DMA2 is in FE, ESAI is in BE. When ESAI drvier > probe, DMA3 channel is created with ESAI's "dma:tx" (DMA3 channel > is not used in this FE-BE case). When FE-BE startup, DMA2 > channel is created, it needs the ESAI's "dma:tx", so below warning > comes out. > > > Regards, > > Lucas > > > > > [ 638.906268] sysfs: cannot create duplicate filename '/devices/soc0/soc/2000000.bus/2000000.spba-bus/2024000.esai/dma:tx' > > > [ 638.919061] CPU: 1 PID: 673 Comm: aplay Not tainted 5.7.0-rc1-12956-gfc64b2585593 #287 > > > [ 638.927113] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > > > [ 638.933690] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) > > > [ 638.941464] [] (show_stack) from [] (dump_stack+0xe4/0x118) > > > [ 638.948808] [] (dump_stack) from [] (sysfs_warn_dup+0x50/0x64) > > > [ 638.956406] [] (sysfs_warn_dup) from [] (sysfs_do_create_link_sd+0xc8/0xd4) > > > [ 638.965134] [] (sysfs_do_create_link_sd) from [] (dma_request_chan+0xb0/0x210) > > > [ 638.974120] [] (dma_request_chan) from [] (dma_request_slave_channel+0x8/0x14) > > > [ 638.983111] [] (dma_request_slave_channel) from [] (fsl_asrc_dma_hw_params+0x1e0/0x438) > > > [ 638.992881] [] (fsl_asrc_dma_hw_params) from [] (soc_pcm_hw_params+0x4a0/0x6a8) > > > [ 639.001952] [] (soc_pcm_hw_params) from [] (dpcm_fe_dai_hw_params+0x70/0xe4) > > > [ 639.010765] [] (dpcm_fe_dai_hw_params) from [] (snd_pcm_hw_params+0x158/0x418) > > > [ 639.019750] [] (snd_pcm_hw_params) from [] (snd_pcm_ioctl+0x734/0x183c) > > > [ 639.028129] [] (snd_pcm_ioctl) from [] (ksys_ioctl+0x2ac/0xb98) > > > [ 639.035812] [] (ksys_ioctl) from [] (ret_fast_syscall+0x0/0x28) > > > [ 639.043490] Exception stack(0xec529fa8 to 0xec529ff0) > > > [ 639.048565] 9fa0: bee84650 01321870 00000004 c25c4111 bee84650 0002000f > > > [ 639.056766] 9fc0: bee84650 01321870 01321820 00000036 00001f40 00000000 0002c2f8 00000003 > > > [ 639.064964] 9fe0: b6f483fc bee8451c b6ee2655 b6e1dcf8 > > > [ 639.070339] fsl-esai-dai 2024000.esai: Cannot create DMA dma:tx symlink > > > > > > Signed-off-by: Shengjiu Wang > > > --- > > > sound/soc/fsl/imx-pcm-dma.c | 173 +++++++++++++++++++++++++++++++++--- > > > 1 file changed, 159 insertions(+), 14 deletions(-) > > > > > > diff --git a/sound/soc/fsl/imx-pcm-dma.c b/sound/soc/fsl/imx-pcm-dma.c > > > index 04a9bc749016..dae53b384df4 100644 > > > --- a/sound/soc/fsl/imx-pcm-dma.c > > > +++ b/sound/soc/fsl/imx-pcm-dma.c > > > @@ -11,6 +11,7 @@ > > > #include > > > #include > > > #include > > > +#include > > > > > > #include > > > #include > > > @@ -29,24 +30,168 @@ static bool filter(struct dma_chan *chan, void *param) > > > return true; > > > } > > > > > > -static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { > > > - .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, > > > - .compat_filter_fn = filter, > > > -}; > > > +static int imx_pcm_hw_params(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream, > > > + struct snd_pcm_hw_params *params) > > > +{ > > > + struct snd_pcm_runtime *runtime = substream->runtime; > > > + struct snd_soc_pcm_runtime *rtd = substream->private_data; > > > + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); > > > + struct snd_dmaengine_dai_dma_data *dma_data; > > > + struct dma_slave_config config; > > > + struct dma_chan *chan; > > > + int ret = 0; > > > > > > -int imx_pcm_dma_init(struct platform_device *pdev, size_t size) > > > + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); > > > + runtime->dma_bytes = params_buffer_bytes(params); > > > + > > > + chan = snd_dmaengine_pcm_get_chan(substream); > > > + if (!chan) > > > + return -EINVAL; > > > + > > > + ret = snd_hwparams_to_dma_slave_config(substream, params, &config); > > > + if (ret) > > > + return ret; > > > + > > > + dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); > > > + if (!dma_data) > > > + return -EINVAL; > > > + > > > + snd_dmaengine_pcm_set_config_from_dai_data(substream, > > > + dma_data, > > > + &config); > > > + return dmaengine_slave_config(chan, &config); > > > +} > > > + > > > +static int imx_pcm_hw_free(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream) > > > { > > > - struct snd_dmaengine_pcm_config *config; > > > + snd_pcm_set_runtime_buffer(substream, NULL); > > > + return 0; > > > +} > > > + > > > +static snd_pcm_uframes_t imx_pcm_pointer(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream) > > > +{ > > > + return snd_dmaengine_pcm_pointer(substream); > > > +} > > > + > > > +static int imx_pcm_trigger(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream, int cmd) > > > +{ > > > + return snd_dmaengine_pcm_trigger(substream, cmd); > > > +} > > > + > > > +static int imx_pcm_open(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream) > > > +{ > > > + struct snd_soc_pcm_runtime *rtd = substream->private_data; > > > + bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; > > > + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); > > > + struct snd_dmaengine_dai_dma_data *dma_data; > > > + struct device *dev = component->dev; > > > + struct snd_pcm_hardware hw; > > > + struct dma_chan *chan; > > > + int ret; > > > + > > > + ret = snd_pcm_hw_constraint_integer(substream->runtime, > > > + SNDRV_PCM_HW_PARAM_PERIODS); > > > + if (ret < 0) { > > > + dev_err(dev, "failed to set pcm hw params periods\n"); > > > + return ret; > > > + } > > > + > > > + dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); > > > + if (!dma_data) > > > + return -EINVAL; > > > + > > > + chan = dma_request_slave_channel(cpu_dai->dev, tx ? "tx" : "rx"); > > > + if (!chan) { > > > + /* Try to request channel using compat_filter_fn */ > > > + chan = snd_dmaengine_pcm_request_channel(filter, > > > + dma_data->filter_data); > > > + if (!chan) > > > + return -ENXIO; > > > + } > > > > > > - config = devm_kzalloc(&pdev->dev, > > > - sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL); > > > - if (!config) > > > - return -ENOMEM; > > > - *config = imx_dmaengine_pcm_config; > > > + ret = snd_dmaengine_pcm_open(substream, chan); > > > + if (ret) > > > + goto pcm_open_fail; > > > > > > - return devm_snd_dmaengine_pcm_register(&pdev->dev, > > > - config, > > > - SND_DMAENGINE_PCM_FLAG_COMPAT); > > > + memset(&hw, 0, sizeof(hw)); > > > + hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | > > > + SNDRV_PCM_INFO_INTERLEAVED; > > > + hw.periods_min = 2; > > > + hw.periods_max = UINT_MAX; > > > + hw.period_bytes_min = 256; > > > + hw.period_bytes_max = dma_get_max_seg_size(chan->device->dev); > > > + hw.buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE; > > > + hw.fifo_size = dma_data->fifo_size; > > > + > > > + /* Refine the hw according to caps of DMA. */ > > > + ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, > > > + dma_data, > > > + &hw, > > > + chan); > > > + if (ret < 0) > > > + goto refine_runtime_hwparams_fail; > > > + > > > + snd_soc_set_runtime_hwparams(substream, &hw); > > > + > > > + /* Support allocate memory from IRAM */ > > > + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_IRAM, > > > + chan->device->dev, > > > + hw.buffer_bytes_max, > > > + &substream->dma_buffer); > > > + if (ret < 0) > > > + goto alloc_pagas_fail; > > > + > > > + return 0; > > > + > > > +alloc_pagas_fail: > > > +refine_runtime_hwparams_fail: > > > + snd_dmaengine_pcm_close(substream); > > > +pcm_open_fail: > > > + dma_release_channel(chan); > > > + > > > + return ret; > > > +} > > > + > > > +static int imx_pcm_close(struct snd_soc_component *component, > > > + struct snd_pcm_substream *substream) > > > +{ > > > + if (substream) { > > > + snd_dma_free_pages(&substream->dma_buffer); > > > + substream->dma_buffer.area = NULL; > > > + substream->dma_buffer.addr = 0; > > > + } > > > + > > > + return snd_dmaengine_pcm_close_release_chan(substream); > > > +} > > > + > > > +static int imx_pcm_new(struct snd_soc_component *component, > > > + struct snd_soc_pcm_runtime *rtd) > > > +{ > > > + struct snd_card *card = rtd->card->snd_card; > > > + > > > + return dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); > > > +} > > > + > > > +static const struct snd_soc_component_driver imx_pcm_component = { > > > + .name = "imx-pcm-dma", > > > + .pcm_construct = imx_pcm_new, > > > + .open = imx_pcm_open, > > > + .close = imx_pcm_close, > > > + .hw_params = imx_pcm_hw_params, > > > + .hw_free = imx_pcm_hw_free, > > > + .trigger = imx_pcm_trigger, > > > + .pointer = imx_pcm_pointer, > > > +}; > > > + > > > +int imx_pcm_dma_init(struct platform_device *pdev, size_t size) > > > +{ > > > + return devm_snd_soc_register_component(&pdev->dev, > > > + &imx_pcm_component, NULL, 0); > > > } > > > EXPORT_SYMBOL_GPL(imx_pcm_dma_init); > > >