linux-kernel - Re: [PATCH v6] usb: xhci-mtk: fix unreleased bandwidth data

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Date:   Tue, 26 Jan 2021 14:02:00 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Ikjoon Jang <ikjn@...omium.org>
CC:     <linux-mediatek@...ts.infradead.org>, <linux-usb@...r.kernel.org>,
        "Zhanyong Wang" <zhanyong.wang@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6] usb: xhci-mtk: fix unreleased bandwidth data

Hi Ikjoon,

Can I put this patch into my patch series about bandwidth scheduler?
the series also include "[RFC PATCH v3 1/5] usb: xhci-mtk: improve
bandwidth scheduling with multi-TT", put them together will help to fix
dependence issue, meanwhile I try to build xhci-mtk-sch.c into
xhci-mtk.ko instead of xhci-hcd.ko.

Thanks a lot


On Wed, 2021-01-13 at 18:05 +0800, Ikjoon Jang wrote:
> xhci-mtk needs XHCI_MTK_HOST quirk functions in add_endpoint() and
> drop_endpoint() to handle its own sw bandwidth management.
> 
> It stores bandwidth data into an internal table every time
> add_endpoint() is called, and drops those in drop_endpoint().
> But when bandwidth allocation fails at one endpoint, all earlier
> allocation from the same interface could still remain at the table.
> 
> This patch moves bandwidth management codes to check_bandwidth() and
> reset_bandwidth() path. To do so, this patch also adds those functions
> to xhci_driver_overrides and lets mtk-xhci to release all failed
> endpoints in reset_bandwidth() path.
> 
> Fixes: 08e469de87a2 ("usb: xhci-mtk: supports bandwidth scheduling with multi-TT")
> Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
> 
> ---
> 
> Changes in v6:
> - use xhci overrides instead of quirk functions for
>   {check|reset}_bandwidth().
> 
> Changes in v5:
> - Fix a wrong commit id in Fixes tag
> 
> Changes in v4:
> - bugfix in v3, check_bandwidth() return uninitialized value
>   when no new endpoints were added.
> - change Fixes tag to keep dependency
> 
> Changes in v3:
> - drop unrelated code cleanups
> - change Fixes tag to keep dependency
> 
> Changes in v2:
> - fix a 0-day warning from unused variable
> - split one big patch into three patches
> - fix wrong offset in mediatek hw flags
> 
>  drivers/usb/host/xhci-mtk-sch.c | 123 ++++++++++++++++++++++----------
>  drivers/usb/host/xhci-mtk.c     |   2 +
>  drivers/usb/host/xhci-mtk.h     |  13 ++++
>  drivers/usb/host/xhci.c         |   8 ++-
>  drivers/usb/host/xhci.h         |   4 ++
>  5 files changed, 111 insertions(+), 39 deletions(-)