Re: [PATCH 0/6] arm64: dts: qcom: sc8280xp: set GPI DMA channels according to DSDT

[Icenowy Zheng]

在 2026-06-09二的 14:23 +0200，Konrad Dybcio写道：
> On 6/7/26 10:49 AM, Icenowy Zheng wrote:
> > 在 2026-06-06六的 21:51 +0800，Pengyu Luo写道：
> > > On Sat, Jun 6, 2026 at 9:21 PM Icenowy Zheng
> > > <zhengxingda@xxxxxxxxxxx> wrote:
> > > > 
> > > > 在 2026-06-06六的 17:46 +0800，Pengyu Luo写道：
> > > > > On 2026-06-06 17:28:35+08:00, Icenowy Zheng wrote:
> > > > > > 在 2026-06-06六的 17:22 +0800，Pengyu Luo写道：
> > > > > > 
> > > > > > > On 2026-06-02 21:21:27+08:00, Icenowy Zheng wrote:
> > > > > > > 
> > > > > > > The magnetic keyboard (USB HID) can't be connected
> > > > > > > somehow,
> > > > > > > others
> > > > > > > are
> > > > > > > fine, such as the spi touchscreen (not upstream yet),
> > > > > > > which
> > > > > > > utilizes
> > > > > > > DMA definitely. My config is here
> > > > > > > https://pastebin.com/SdjuyJYk
> > > > > > 
> > > > > > Is this a defconfig?
> > > > > > 
> > > > > 
> > > > > Yes.
> > > > > 
> > > > > > BTW it seems that CONFIG_ASYNC_TX_DMA needs to be selected
> > > > > > too
> > > > > > for
> > > > > > exhibiting the problem (because there should be "public"
> > > > > > GPI
> > > > > > DMA
> > > > > > consumers to trigger the stuck/reset).
> > > > > > 
> > > > > 
> > > > > Is this still necessary? I checked the fedora discussion and
> > > > > your
> > > > > GPI
> > > > > DMA fix. And GPI DMA is only for the QUP-supported
> > > > > peripherals as
> > > > > the
> > > > > binding mentioned, devicetree/bindings/dma/qcom,gpi.yaml
> > > > 
> > > > The devicetree without this fix seems to be still incorrect,
> > > > because
> > > > with the device tree fix even if the GPI DMA driver misbehaves
> > > > the
> > > > system won't be stuck (although it will iterate all GPI
> > > > channels
> > > > and
> > > > then fail to function at all).
> > > > 
> > > 
> > > Back to the start. You said some GPI interfaces aren't available
> > > to
> > > HLOS, your mask is 0xb(0b1011), so I use 0x4(0b100) did a quick
> > > test,
> > > and spi6 consumed it, no stuck or reset. Could you give me a
> > > unavailable channel?
> > 
> > I think channel 0b10000 of gpi_dma2 could be an example?
> > 
> > It seems that 4 channels are tried on gpi_dma2 before hang on my
> > gaokun3, but as gaokun3 has no known serial access, it's possible
> > that
> > 0b100000 or 0b1000 is problematic.
> > 
> > (The reason gpi_dma2 is checked first is because it's the GPI DMA
> > controller with the smallest address)
> > 
> > BTW I just took the values from Windows DSDT, which is quite
> > conservative.
> 
> So, with DMA_PRIVATE set, is this series made redundant?

I assume technically the trustzone is still protecting some channels,
although the system stuck issue is fixed.

This series should still be relevant, although not so emergent.

Thanks,
Icenowy

> 
> Konrad