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From: Shengjiu Wang <shengjiu.wang@gmail.com>
To: Mark Brown <broonie@kernel.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>,
	linaro-mm-sig@lists.linaro.org,
	Linux-ALSA <alsa-devel@alsa-project.org>,
	linuxppc-dev@lists.ozlabs.org,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Timur Tabi <timur@kernel.org>, Xiubo Li <Xiubo.Lee@gmail.com>,
	shawnguo@kernel.org, Shengjiu Wang <shengjiu.wang@nxp.com>,
	Takashi Iwai <tiwai@suse.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	dri-devel@lists.freedesktop.org, perex@perex.cz,
	Nicolin Chen <nicoleotsuka@gmail.com>,
	linux-imx@nxp.com, kernel@pengutronix.de,
	linux-media@vger.kernel.org, Fabio Estevam <festevam@gmail.com>,
	s.hauer@pengutronix.de, linux-arm-kernel@lists.infradead.org,
	Lucas Stach <l.stach@pengutronix.de>
Subject: Re: [PATCH] ASoC: fsl: imx-pcm-dma: Don't request dma channel in probe
Date: Thu, 21 May 2020 19:30:04 +0800
Message-ID: <CAA+D8AOiVVi3B4dzU8r=rCMz=6w9R=wxBkzAQ=0=RAQLKCWy8Q@mail.gmail.com> (raw)
In-Reply-To: <20200520123850.GE4823@sirena.org.uk>

On Wed, May 20, 2020 at 8:38 PM Mark Brown <broonie@kernel.org> wrote:
>
> On Wed, May 20, 2020 at 07:22:19PM +0800, Shengjiu Wang wrote:
>
> > I see some driver also request dma channel in open() or hw_params().
> > how can they avoid the defer probe issue?
> > for example:
> > sound/arm/pxa2xx-pcm-lib.c
> > sound/soc/sprd/sprd-pcm-dma.c
>
> Other drivers having problems means those drivers should be fixed, not
> that we should copy the problems.  In the case of the PXA driver that's
> very old code which predates deferred probe by I'd guess a decade.

Thanks.

For the FE-BE case, do you have any suggestion for how fix it?

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 the warning
comes out.

best regards
wang shengjiu

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Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-19  9:41 Shengjiu Wang
2020-05-19 10:01 ` Lucas Stach
2020-05-20  8:20   ` Shengjiu Wang
2020-05-20  9:42     ` Lucas Stach
2020-05-20 11:22       ` Shengjiu Wang
2020-05-20 12:38         ` Mark Brown
2020-05-21 11:30           ` Shengjiu Wang [this message]
2020-05-22 13:12             ` Mark Brown
2021-04-14 14:33       ` Robin Gong
2021-04-14 15:33         ` Lucas Stach
2021-04-19  7:17           ` Robin Gong
2021-04-19  9:46             ` Lucas Stach
2021-04-20 13:47               ` Robin Gong
2021-04-20 14:00                 ` Lucas Stach
2021-04-21 14:54                   ` Robin Gong
2021-04-21 17:43                     ` Lucas Stach
2021-04-21 17:46                       ` Mark Brown
2021-04-22  3:33                       ` Robin Gong

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