linux-kernel - Re: [PATCH v2] dmaengine: dw: Select only supported masters for ACPI devices

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Message-ID: <ZuyEQOIztvUrO0gO@smile.fi.intel.com>
Date: Thu, 19 Sep 2024 23:06:24 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Viresh Kumar <vireshk@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Ferry Toth <fntoth@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ferry Toth <ftoth@...londelft.nl>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: dw: Select only supported masters for ACPI
 devices

On Thu, Sep 19, 2024 at 09:51:48PM +0300, Serge Semin wrote:
> The recently submitted fix-commit revealed a problem in the iDMA32
> platform code. Even though the controller supported only a single master
> the dw_dma_acpi_filter() method hard-coded two master interfaces with IDs
> 0 and 1. As a result the sanity check implemented in the commit
> b336268dde75 ("dmaengine: dw: Add peripheral bus width verification") got
> incorrect interface data width and thus prevented the client drivers
> from configuring the DMA-channel with the EINVAL error returned. E.g. the
> next error was printed for the PXA2xx SPI controller driver trying to
> configure the requested channels:
> 
> > [  164.525604] pxa2xx_spi_pci 0000:00:07.1: DMA slave config failed
> > [  164.536105] pxa2xx_spi_pci 0000:00:07.1: failed to get DMA TX descriptor
> > [  164.543213] spidev spi-SPT0001:00: SPI transfer failed: -16
> 
> The problem would have been spotted much earlier if the iDMA32 controller
> supported more than one master interfaces. But since it supports just a
> single master and the iDMA32-specific code just ignores the master IDs in
> the CTLLO preparation method, the issue has been gone unnoticed so far.
> 
> Fix the problem by specifying a single master ID for both memory and
> peripheral devices on the ACPI-based platforms if there is only one master
> available on the controller. Thus the issue noticed for the iDMA32
> controllers will be eliminated and the ACPI-probed DW DMA controllers will
> be configured with the correct master ID by default.

Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Seems this fixes the bug I have seen.
Ferry, can you confirm?

-- 
With Best Regards,
Andy Shevchenko