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From: Tejas Joglekar <Tejas.Joglekar@synopsys.com>
To: Rob Herring <robh@kernel.org>,
	Tejas Joglekar <Tejas.Joglekar@synopsys.com>,
	"balbi@kernel.org" <balbi@kernel.org>
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: Tue, 14 Apr 2020 10:09:36 +0000
Message-ID: <fe59318a-b3dd-c6af-702e-1ca4aed04a8b@synopsys.com> (raw)
In-Reply-To: <20200405014548.GA25539@bogus>

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?
 
> Rob
> 

Thanks & Regards,
 Tejas Joglekar


  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  8:52 [RESENDING RFC PATCH 0/4] Add logic to consolidate TRBs for Synopsys xHC Tejas Joglekar
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 [this message]
2020-04-16  8:22       ` Felipe Balbi
2020-04-16 16:37         ` Tejas Joglekar
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
2020-03-27  8:53 ` [RESENDING RFC PATCH 4/4] usb: xhci: Use temporary buffer to consolidate SG Tejas Joglekar
2020-03-27  9:27   ` Greg KH
2020-03-27 10:05     ` Tejas Joglekar
2020-03-27 10:22       ` Greg KH
2020-03-27 11:25         ` Mathias Nyman
2020-03-27 15:38           ` Raul Rangel
2020-03-27  9:28 ` [RESENDING RFC PATCH 0/4] Add logic to consolidate TRBs for Synopsys xHC Greg KH
2020-03-27  9:43   ` Tejas Joglekar

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