[14/15] usb: dwc3: Add disabling of start_transfer failure quirk

In DWC_usb31 version 1.70a-ea06 and prior needs a SW workaround for isoc
START TRANSFER command failure. However, some affected versions may have
RTL patches to fix this without a SW workaround. Add this quirk to
disable the SW workaround when it is not needed.

Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
endpoints.

Cc: John Youn <johnyoun@synopsys.com>
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
---
 Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
 1 file changed, 3 insertions(+)

On Fri, Jan 05, 2018 at 12:16:02PM -0800, Thinh Nguyen wrote:
> In DWC_usb31 version 1.70a-ea06 and prior needs a SW workaround for isoc
> START TRANSFER command failure. However, some affected versions may have
> RTL patches to fix this without a SW workaround. Add this quirk to
> disable the SW workaround when it is not needed.

I really think this one should be implied by compatible strings.

> Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
> endpoints.
> 
> Cc: John Youn <johnyoun@synopsys.com>
> Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
> ---
>  Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
> index 02dde83d02fa..c03a3b363cde 100644
> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
> @@ -15,6 +15,9 @@ Optional properties:
>   - phys: from the *Generic PHY* bindings
>   - phy-names: from the *Generic PHY* bindings; supported names are "usb2-phy"
>  	or "usb3-phy".
> + - snps,dis_start_transfer_quirk: when set, disable isoc START TRANSFER command
> +			failure SW work-around for DWC_usb31 version 1.70a-ea06
> +			and prior.
>   - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
>   - snps,disable_scramble_quirk: true when SW should disable data scrambling.
>  	Only really useful for FPGA builds.
> -- 
> 2.11.0
> 
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Hi,

Rob Herring <robh@kernel.org> writes:
> On Fri, Jan 05, 2018 at 12:16:02PM -0800, Thinh Nguyen wrote:
>> In DWC_usb31 version 1.70a-ea06 and prior needs a SW workaround for isoc
>> START TRANSFER command failure. However, some affected versions may have
>> RTL patches to fix this without a SW workaround. Add this quirk to
>> disable the SW workaround when it is not needed.
>
> I really think this one should be implied by compatible strings.

won't work for dwc3. Core driver has a single compatible string, also
this wouldn't work for PCI-based implementations.

On Tue, Jan 9, 2018 at 2:45 AM, Felipe Balbi <balbi@kernel.org> wrote:
>
> Hi,
>
> Rob Herring <robh@kernel.org> writes:
>> On Fri, Jan 05, 2018 at 12:16:02PM -0800, Thinh Nguyen wrote:
>>> In DWC_usb31 version 1.70a-ea06 and prior needs a SW workaround for isoc
>>> START TRANSFER command failure. However, some affected versions may have
>>> RTL patches to fix this without a SW workaround. Add this quirk to
>>> disable the SW workaround when it is not needed.
>>
>> I really think this one should be implied by compatible strings.
>
> won't work for dwc3. Core driver has a single compatible string, also
> this wouldn't work for PCI-based implementations.

Then you will have to look at the parent node (this is why the way
DWC3 was split is wrong) or make the compatible strings more specific.
That is the purpose of compatible strings.

For PCI, don't you have different VID/PIDs? If not how would quirks
work for non-DT systems.

Rob
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