From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: "Shih-Yuan Lee (FourDollars)" <fourdollars@debian.org>
Cc: Mark Brown <broonie@debian.org>, Lukas Wunner <lukas@wunner.de>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Daniel Mack <daniel@zonque.org>,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Robert Jarzmik <robert.jarzmik@free.fr>,
linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v16 5/7] spi: pxa2xx: disable DMA for Apple MacBook8,1
Date: Tue, 21 Jul 2026 23:28:29 +0300 [thread overview]
Message-ID: <al_WbeyPMvtcmO32@ashevche-desk.local> (raw)
In-Reply-To: <CAAT15mNppZ6nPQ9a8Hp54XK4BXndfv+G24n4VeQ1X8GOk6fSyQ@mail.gmail.com>
On Tue, Jul 21, 2026 at 11:26:27PM +0800, Shih-Yuan Lee (FourDollars) wrote:
> On Tue, Jul 21, 2026 at 11:05 PM Mark Brown <broonie@debian.org> wrote:
...
> Actually, I was just following Lukas's suggestion to modify
> drivers/dma/dw/pci.c to do a quick proof-of-concept test, and I used
> an AI assistant to help me write and deploy the driver quirk code.
>
> I have previous experience with the Initrd ACPI Table Override
> mechanism, so I can definitely try that on my machine next to see if
> we can get DMA working properly by aligning the PCI routing and DMAR
> mapping correctly).
> output.
For old hardware (before Skylake) LPSS DMA interrupt line is defined in
two places: DSDT (and/or PCI) and CSRT. Changing in one might not help
as CSRT may have something different. Check drivers/dma/acpi-dma.c
acpi_dma_parse_resource_group().
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-07-21 20:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 16:21 [PATCH v16 0/7] spi: pxa2xx: Fix PM and interrupt issues on Intel LPSS SPI Shih-Yuan Lee
2026-07-20 16:21 ` [PATCH v16 1/7] spi: pxa2xx: introduce clock enable and disable helper functions Shih-Yuan Lee
2026-07-20 19:22 ` Andy Shevchenko
2026-07-20 16:21 ` [PATCH v16 2/7] spi: pxa2xx: introduce suspended flag for interrupt synchronization Shih-Yuan Lee
2026-07-20 17:18 ` Mark Brown
2026-07-20 16:21 ` [PATCH v16 3/7] spi: pxa2xx: overhaul teardown and suspend sequence using pxa2xx_spi_off Shih-Yuan Lee
2026-07-20 19:53 ` Andy Shevchenko
2026-07-20 16:21 ` [PATCH v16 4/7] spi: pxa2xx: lock out runtime autosuspend for Intel LPSS SPI in PIO mode Shih-Yuan Lee
2026-07-20 19:55 ` Andy Shevchenko
2026-07-20 16:21 ` [PATCH v16 5/7] spi: pxa2xx: disable DMA for Apple MacBook8,1 Shih-Yuan Lee
2026-07-20 19:27 ` Andy Shevchenko
2026-07-21 14:49 ` Shih-Yuan Lee (FourDollars)
2026-07-21 20:31 ` Andy Shevchenko
2026-07-21 9:00 ` Lukas Wunner
2026-07-21 9:26 ` Shih-Yuan Lee (FourDollars)
2026-07-21 14:34 ` Shih-Yuan Lee (FourDollars)
2026-07-21 15:05 ` Mark Brown
2026-07-21 15:26 ` Shih-Yuan Lee (FourDollars)
2026-07-21 16:09 ` Shih-Yuan Lee (FourDollars)
2026-07-21 20:41 ` Andy Shevchenko
2026-07-21 20:28 ` Andy Shevchenko [this message]
2026-07-20 16:21 ` [PATCH v16 6/7] spi: pxa2xx: restore LPSS private register state on S3 resume Shih-Yuan Lee
2026-07-20 19:59 ` Andy Shevchenko
2026-07-20 16:21 ` [PATCH v16 7/7] spi: pxa2xx: rename local status variable to ret Shih-Yuan Lee
2026-07-20 19:56 ` Andy Shevchenko
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