linux-kernel - Re: [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic

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Date:   Sat, 29 May 2021 12:24:21 -0700
From:   Jack Pham <jackp@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Wesley Cheng <wcheng@...eaurora.org>, balbi@...nel.org,
        gregkh@...uxfoundation.org, agross@...nel.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Thinh.Nguyen@...opsys.com
Subject: Re: [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX
 FIFO resize logic

Hi Bjorn,

On Sat, May 29, 2021 at 12:07:31PM -0500, Bjorn Andersson wrote:
> On Wed 19 May 02:43 CDT 2021, Wesley Cheng wrote:
> 
> > Enable the flexible TX FIFO resize logic on SM8150.  Using a larger TX FIFO
> > SZ can help account for situations when system latency is greater than the
> > USB bus transmission latency.
> > 
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
> 
> Based on my previous request of always adding this for the Qualcomm
> platforms that supports it, which is implemented in patch 4, I don't see
> a need for this patch.
> 
> Am I missing something?

Looks like Wesley had quickly sent a V9 of the series right after V8,
and the DTSI change is dropped.

https://lore.kernel.org/linux-usb/1621410561-32762-1-git-send-email-wcheng@codeaurora.org/T/#t

Thanks,
Jack

> > ---
> >  arch/arm64/boot/dts/qcom/sm8150.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > index 51235a9..8f532cb 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > @@ -2275,6 +2275,7 @@
> >  				iommus = <&apps_smmu 0x140 0>;
> >  				snps,dis_u2_susphy_quirk;
> >  				snps,dis_enblslpm_quirk;
> > +				tx-fifo-resize;
> >  				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> >  				phy-names = "usb2-phy", "usb3-phy";
> >  			};

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