linux-kernel - Re: [PATCH v5] i2c: imx: support DMA defer probing

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Message-ID: <Z2O3d5Kke7zIr4IW@pengutronix.de>
Date: Thu, 19 Dec 2024 07:04:39 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Carlos Song <carlos.song@....com>
Cc: andi.shyti@...nel.org, frank.li@....com, kernel@...gutronix.de,
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
	linux-i2c@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Clark Wang <xiaoning.wang@....com>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: Re: [PATCH v5] i2c: imx: support DMA defer probing

On Wed, Dec 18, 2024 at 12:35:41PM +0800, Carlos Song wrote:
> Return -EPROBE_DEFER when dma_request_slave_channel() because DMA driver
> have not ready yet.
> 
> Move i2c_imx_dma_request() before registering I2C adapter to avoid
> infinite loop of .probe() calls to the same driver, see "e8c220fac415
> Revert "i2c: imx: improve the error handling in i2c_imx_dma_request()""
> and "Documentation/driver-api/driver-model/driver.rst".
> 
> Use CPU mode to avoid stuck registering i2c adapter when DMA resources
> are unavailable.
> 
> Signed-off-by: Carlos Song <carlos.song@....com>
> Signed-off-by: Clark Wang <xiaoning.wang@....com>
> Acked-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>

Thank you!

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