linux-kernel - Re: [PATCH v3 2/2] arm64: dts: qcom: sc8280xp: Describe GPI DMA controller nodes

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Message-ID: <4eg3xtjl5e2vyuyr6bxyowzs47rmbbixka2jnfpdq5hecaekox@dbadmm53a4fo>
Date: Fri, 1 Aug 2025 20:25:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Pengyu Luo <mitltlatltl@...il.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] arm64: dts: qcom: sc8280xp: Describe GPI DMA
 controller nodes

On Fri, Aug 01, 2025 at 10:27:55PM +0800, Pengyu Luo wrote:
> On Thu, Jul 31, 2025 at 6:33 AM Konrad Dybcio
> <konrad.dybcio@....qualcomm.com> wrote:
> >
> > On 6/17/25 11:00 AM, Pengyu Luo wrote:
> > > SPI on SC8280XP requires DMA (GSI) mode to function properly. Without
> > > it, SPI controllers fall back to FIFO mode, which causes:
> > >
> > > [    0.901296] geni_spi 898000.spi: error -ENODEV: Failed to get tx DMA ch
> > > [    0.901305] geni_spi 898000.spi: FIFO mode disabled, but couldn't get DMA, fall back to FIFO mode
> > > ...
> > > [   45.605974] goodix-spi-hid spi0.0: SPI transfer timed out
> > > [   45.605988] geni_spi 898000.spi: Can't set CS when prev xfer running
> > > [   46.621555] spi_master spi0: failed to transfer one message from queue
> > > [   46.621568] spi_master spi0: noqueue transfer failed
> > > [   46.621577] goodix-spi-hid spi0.0: spi transfer error: -110
> > > [   46.621585] goodix-spi-hid spi0.0: probe with driver goodix-spi-hid failed with error -110
> > >
> > > Therefore, describe GPI DMA controller nodes for qup{0,1,2}, and
> > > describe DMA channels for SPI and I2C, UART is excluded for now, as
> > > it does not yet support this mode.
> > >
> > > Note that, since there is no public schematic, this is derived from
> > > Windows drivers. The drivers do not expose any DMA channel mask
> > > information, so all available channels are enabled.
> > >
> > > Signed-off-by: Pengyu Luo <mitltlatltl@...il.com>
> > > ---
> >
> > [...]
> >
> > > +             gpi_dma0: dma-controller@...000  {
> >
> > Double space before '{'
> >
> 
> Ack
> 
> > > +                     compatible = "qcom,sc8280xp-gpi-dma", "qcom,sm6350-gpi-dma";
> > > +                     reg = <0 0x00900000 0 0x60000>;
> > > +
> > > +                     interrupts = <GIC_SPI 244 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 246 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 247 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 248 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 249 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 250 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 251 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 253 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 254 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 255 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                  <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>;
> >
> > The last entry is incorrect and superfluous, please remove
> >
> 
> Sure, I can remove it. But the last entry is here in qcgpi8280.inf

Nevertheless, it's not a GPI interrupt.

> 
> [Hardware_Registry_Base_8280]
> HKR,QUP\0,"NumGpii",%REG_DWORD%, 13
> HKR,Interrupt\0,"0",%REG_DWORD%, 276
> HKR,Interrupt\0,"1",%REG_DWORD%, 277
> HKR,Interrupt\0,"2",%REG_DWORD%, 278
> HKR,Interrupt\0,"3",%REG_DWORD%, 279
> HKR,Interrupt\0,"4",%REG_DWORD%, 280
> HKR,Interrupt\0,"5",%REG_DWORD%, 281
> HKR,Interrupt\0,"6",%REG_DWORD%, 282
> HKR,Interrupt\0,"7",%REG_DWORD%, 283
> HKR,Interrupt\0,"8",%REG_DWORD%, 284
> HKR,Interrupt\0,"9",%REG_DWORD%, 285
> HKR,Interrupt\0,"10",%REG_DWORD%, 286
> HKR,Interrupt\0,"11",%REG_DWORD%, 287
> HKR,Interrupt\0,"12",%REG_DWORD%, 288
> 
> > You can also enable the gpi_dma nodes by default
> >
> 
> Got it.
> 
> Best wishes,
> Pengyu

-- 
With best wishes
Dmitry