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The cache type configuration is actually native feature of DWC3, not additional desgin (or glue layer) coming from SoC, so add compatible string 'fsl,ls-dwc3'. Signed-off-by: Ran Wang Reviewed-by: Jun Li Signed-off-by: Frank Li --- Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documen= tation/devicetree/bindings/usb/snps,dwc3.yaml index 1cd0ca90127d9..02cb986d0fd32 100644 --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml @@ -32,6 +32,7 @@ properties: compatible: contains: oneOf: + - const: fsl,ls-dwc3 - const: snps,dwc3 - const: synopsys,dwc3 deprecated: true --=20 2.34.1 From nobody Sun Feb 8 00:11:50 2026 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2057.outbound.protection.outlook.com [40.107.22.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB58A194C90; Wed, 3 Jul 2024 23:07:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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For each transfer type, controller has a 4-bit register field to enable different cache type. Quoted from DWC3 data book Table 6-5 Cache Type Bit Assignments: Reviewed-by: Jun Li ---------------------------------------------------------------- MBUS_TYPE| bit[3] |bit[2] |bit[1] |bit[0] ---------------------------------------------------------------- AHB |Cacheable |Bufferable |Privilegge |Data AXI3 |Write Allocate|Read Allocate|Cacheable |Bufferable AXI4 |Allocate Other|Allocate |Modifiable |Bufferable AXI4 |Other Allocate|Allocate |Modifiable |Bufferable Native |Same as AXI |Same as AXI |Same as AXI|Same as AXI ---------------------------------------------------------------- Note: The AHB, AXI3, AXI4, and PCIe busses use different names for certain signals, which have the same meaning: Bufferable =3D Posted Cacheable =3D Modifiable =3D Snoop (negation of No Snoop) In most cases, driver work well with default value. But USB device detect failure sometime on Layerscape platforms if bit[1] not set and enable dma-coherent. Set bit[1] "Snoop" for Data Read, Desc Read, Data Write and Desc write if compatible string contain fsl,ls-dwc3. Signed-off-by: Ran Wang Reviewed-by: Jun Li Signed-off-by: Frank Li --- drivers/usb/dwc3/core.c | 12 ++++++++++++ drivers/usb/dwc3/core.h | 4 ++++ 2 files changed, 16 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index cb82557678ddd..2b474de83b783 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1061,6 +1061,18 @@ static void dwc3_set_incr_burst_type(struct dwc3 *dw= c) =20 cfg =3D dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); =20 + if (of_device_is_compatible(dev->of_node, "fsl,ls-dwc3")) { + + cfg &=3D ~(DWC3_GSBUSCFG0_DATARD | DWC3_GSBUSCFG0_DESCRD | + DWC3_GSBUSCFG0_DATAWR | DWC3_GSBUSCFG0_DESCWR); + cfg |=3D FIELD_PREP(DWC3_GSBUSCFG0_DATARD, 2) | + FIELD_PREP(DWC3_GSBUSCFG0_DESCRD, 2) | + FIELD_PREP(DWC3_GSBUSCFG0_DATAWR, 2) | + FIELD_PREP(DWC3_GSBUSCFG0_DESCWR, 2); + + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg); + } + /* * Handle property "snps,incr-burst-type-adjustment". * Get the number of value from this property: diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 3781c736c1a17..99edfabd89673 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -184,6 +184,10 @@ /* Bit fields */ =20 /* Global SoC Bus Configuration INCRx Register 0 */ +#define DWC3_GSBUSCFG0_DATARD GENMASK(31, 28) +#define DWC3_GSBUSCFG0_DESCRD GENMASK(27, 24) +#define DWC3_GSBUSCFG0_DATAWR GENMASK(23, 20) +#define DWC3_GSBUSCFG0_DESCWR GENMASK(19, 16) #define DWC3_GSBUSCFG0_INCR256BRSTENA (1 << 7) /* INCR256 burst */ #define DWC3_GSBUSCFG0_INCR128BRSTENA (1 << 6) /* INCR128 burst */ #define DWC3_GSBUSCFG0_INCR64BRSTENA (1 << 5) /* INCR64 burst */ --=20 2.34.1