From: Tejas Joglekar <Tejas.Joglekar@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
Tejas Joglekar <Tejas.Joglekar@synopsys.com>,
Rob Herring <robh@kernel.org>,
Mathias Nyman <mathias.nyman@intel.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
John Youn <John.Youn@synopsys.com>
Subject: Re: [RESENDING RFC PATCH 1/4] dt-bindings: usb: Add snps,consolidate-sgl & consolidate-sgl
Date: Thu, 16 Apr 2020 16:37:30 +0000 [thread overview]
Message-ID: <aa1023c6-fe8c-8f5b-365f-403ac50ac94f@synopsys.com> (raw)
In-Reply-To: <874ktjsuuy.fsf@kernel.org>
Hi,
On 4/16/2020 1:52 PM, Felipe Balbi wrote:
>
> Hi,
>
> Tejas Joglekar <Tejas.Joglekar@synopsys.com> writes:
>> Hi,
>> On 4/5/2020 7:15 AM, Rob Herring wrote:
>>> On Fri, Mar 27, 2020 at 03:11:56PM +0530, Tejas Joglekar wrote:
>>>> This commit adds the documentation for consolidate-sgl, and
>>>> snps,consolidate-sgl property. These when set enables the quirk for
>>>> XHCI driver for consolidation of sg list into a temporary buffer when small
>>>> buffer sizes are scattered over the sg list not making up to MPS or total
>>>> transfer size within TRB cache size with Synopsys xHC.
>>>>
>>>> Signed-off-by: Tejas Joglekar <joglekar@synopsys.com>
>>>> ---
>>>> Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
>>>> Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++
>>>> 2 files changed, 6 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>>>> index 9946ff9ba735..292d1f7969e4 100644
>>>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>>>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>>>> @@ -104,6 +104,9 @@ Optional properties:
>>>> this and tx-thr-num-pkt-prd to a valid, non-zero value
>>>> 1-16 (DWC_usb31 programming guide section 1.2.3) to
>>>> enable periodic ESS TX threshold.
>>>> + - snps,consolidate-sgl: enable sg list consolidation - host mode only. Set to use
>>>> + SG buffers of at least MPS size by consolidating smaller SG
>>>> + buffers list into a single buffer.
>>>
>>> The preference is not to keep adding properties for every single quirk
>>> or feature. These should be implied by specific compatibles. As Synopsys
>>> knows what quirks/errata/features are in each version of IP, the
>>> compatible strings should reflect those versions. (And yes, I'm sure
>>> there's customer ECO fixes that aren't reflected in the version, but
>>> that's why we have SoC specific compatibles too.) This is the only way
>>> we can fix quirks in the OS without doing DT updates. For comparison, do
>>> you want to have to update your PC BIOS so an OS can work-around issues?
>>>
>> Yes, I understand what you want to say here. But I think this compatible string
>> does not work with the platform drivers with PCI based systems. So based on the vendor
>> id and device id then I need to set the quirk required.
>>
>> @Felipe: What do you suggest for setting up quirk without the DT update for dwc3?
>
> We have been using Synopsys controller's revision register, but that's
> not visible to xhci driver and we don't have a separate compatible for
> each synopsys version on the xhci driver side. One option would be to
> add "snps,xhci-foo-bar" to xhci-plat and use that.
>
@Felipe: Thanks for suggestion
@Mathias: Do you prefer parameter passed this way? I can send the v2 patch set,
after your input.
Thanks & Regards,
Tejas Joglekar
next prev parent reply other threads:[~2020-04-16 16:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1585297723.git.joglekar@synopsys.com>
2020-03-27 8:34 ` [RFC PATCH 1/4] dt-bindings: usb: Add snps,consolidate-sgl & consolidate-sgl Tejas Joglekar
2020-03-27 9:41 ` [RESENDING RFC " Tejas Joglekar
2020-03-27 9:54 ` Greg KH
2020-03-27 10:11 ` Tejas Joglekar
2020-03-27 10:24 ` Greg KH
2020-03-27 10:28 ` Tejas Joglekar
2020-04-05 1:45 ` Rob Herring
2020-04-14 10:09 ` Tejas Joglekar
2020-04-16 8:22 ` Felipe Balbi
2020-04-16 16:37 ` Tejas Joglekar [this message]
2020-04-17 11:44 ` Mathias Nyman
2020-03-27 8:35 ` [RFC PATCH 2/4] usb: xhci: Set quirk for XHCI_CONSOLIDATE_SG_LIST Tejas Joglekar
2020-03-27 9:42 ` [RESENDING RFC " Tejas Joglekar
2020-03-27 8:35 ` [RFC PATCH 3/4] usb: dwc3: Add device property consolidate-sgl Tejas Joglekar
2020-03-27 9:42 ` [RESENDING RFC " Tejas Joglekar
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