| Message ID | 20231101101625.4151442-3-mnkumar@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add a quirk in xhci-plat for parent nodes to specify no 64 bit support | expand |
On Wed, Nov 01, 2023 at 10:16:25AM +0000, Naveen Kumar wrote: > From: Naveen Kumar M <mnkumar@google.com> > > Add a new DT option to specify whether a host controller is able to > support 64-bit DMA memory pointers What host controllers are broken? > Signed-off-by: Naveen Kumar M <mnkumar@google.com> > --- > Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml > index 180a261c3e8f..20dc134004f3 100644 > --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml > @@ -25,6 +25,10 @@ properties: > description: Set if the controller has broken port disable mechanism > type: boolean > > + quirk-no-64-bit-support: > + description: Set if the xHC doesn't support 64-bit DMA memory pointers To set this property, you need to know that the host controller is broken, so why not just make the driver set the quirk once it sees that the host controller is one of the broken ones? Unless there are "sometimes broken" host controllers, a dedicated property should not be needed, right? > + type: boolean > + > imod-interval-ns: > description: Interrupt moderation interval > default: 5000 > -- > 2.42.0.820.g83a721a137-goog >
On 01/11/2023 11:38, Conor Dooley wrote: > On Wed, Nov 01, 2023 at 10:16:25AM +0000, Naveen Kumar wrote: >> From: Naveen Kumar M <mnkumar@google.com> >> >> Add a new DT option to specify whether a host controller is able to >> support 64-bit DMA memory pointers > > What host controllers are broken? > >> Signed-off-by: Naveen Kumar M <mnkumar@google.com> >> --- >> Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml >> index 180a261c3e8f..20dc134004f3 100644 >> --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml >> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml >> @@ -25,6 +25,10 @@ properties: >> description: Set if the controller has broken port disable mechanism >> type: boolean >> >> + quirk-no-64-bit-support: >> + description: Set if the xHC doesn't support 64-bit DMA memory pointers > > To set this property, you need to know that the host controller is > broken, so why not just make the driver set the quirk once it sees that > the host controller is one of the broken ones? > Unless there are "sometimes broken" host controllers, a dedicated > property should not be needed, right? Yep, this looks like property specific to given XHCI controller, thus can be implied from compatible and there is no need for new DT property at all. Also, there is no single DTS user of this property. It looks like you add it for some out-of-tree vendor or non-upstreamable code, which personally I would not care about. Feel free to prove me wrong by adding it to respective DTS in other patchset linked here. Best regards, Krzysztof
On Wed, Nov 01, 2023 at 10:16:25AM +0000, Naveen Kumar wrote: > From: Naveen Kumar M <mnkumar@google.com> > > Add a new DT option to specify whether a host controller is able to > support 64-bit DMA memory pointers > > Signed-off-by: Naveen Kumar M <mnkumar@google.com> > --- > Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml > index 180a261c3e8f..20dc134004f3 100644 > --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml > @@ -25,6 +25,10 @@ properties: > description: Set if the controller has broken port disable mechanism > type: boolean > > + quirk-no-64-bit-support: > + description: Set if the xHC doesn't support 64-bit DMA memory pointers > + type: boolean To add on to this, you can handle this with dma-ranges if you need to limit DMA addresses to less than 32-bits. Rob
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml index 180a261c3e8f..20dc134004f3 100644 --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml @@ -25,6 +25,10 @@ properties: description: Set if the controller has broken port disable mechanism type: boolean + quirk-no-64-bit-support: + description: Set if the xHC doesn't support 64-bit DMA memory pointers + type: boolean + imod-interval-ns: description: Interrupt moderation interval default: 5000