From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Zhanyong Wang <zhanyong.wang@mediatek.com>,
Mathias Nyman <mathias.nyman@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Tianping Fang <tianping.fang@mediatek.com>,
linux-mediatek@lists.infradead.org,
Matthias Brugger <matthias.bgg@gmail.com>,
Ikjoon Jang <ikjn@chromium.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5] usb: xhci-mtk: fix unreleased bandwidth data
Date: Fri, 8 Jan 2021 16:46:38 +0200 [thread overview]
Message-ID: <e43632e2-08b3-7a1a-8272-1d493e25fc67@linux.intel.com> (raw)
In-Reply-To: <1610086308.24856.30.camel@mhfsdcap03>
On 8.1.2021 8.11, Chunfeng Yun wrote:
> On Thu, 2021-01-07 at 13:09 +0200, Mathias Nyman wrote:
>> On 29.12.2020 8.24, Ikjoon Jang wrote:
>>> xhci-mtk has hooks on add_endpoint() and drop_endpoint() from xhci
>>> to handle its own sw bandwidth managements and stores bandwidth data
>>> into internal table every time add_endpoint() is called,
>>> so when bandwidth allocation fails at one endpoint, all earlier
>>> allocation from the same interface could still remain at the table.
>>>
>>> This patch adds two more hooks from check_bandwidth() and
>>> reset_bandwidth(), and make mtk-xhci to releases all failed endpoints
>>> from reset_bandwidth().
>>>
>>> Fixes: 08e469de87a2 ("usb: xhci-mtk: supports bandwidth scheduling with multi-TT")
>>> Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
>>>
>>
>> ...
>>
>>>
>>> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
>>> index d4a8d0efbbc4..e1fcd3cf723f 100644
>>> --- a/drivers/usb/host/xhci.c
>>> +++ b/drivers/usb/host/xhci.c
>>> @@ -2882,6 +2882,12 @@ static int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
>>> xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
>>> virt_dev = xhci->devs[udev->slot_id];
>>>
>>> + if (xhci->quirks & XHCI_MTK_HOST) {
>>> + ret = xhci_mtk_check_bandwidth(hcd, udev);
>>> + if (ret < 0)
>>> + return ret;
>>> + }
>>> +
>>
>> Just noticed that XHCI_MTK_HOST quirk is only set in xhci-mtk.c.
>> xhci-mtk.c calls xhci_init_driver(..., xhci_mtk_overrides) with a .reset override function.
>>
>> why not add override functions for .check_bandwidth and .reset_bandwidth to xhci_mtk_overrides instead?
>>
>> Another patch to add similar overrides for .add_endpoint and .drop_endpoint should probably be
>> done so that we can get rid of the xhci_mtk_add/drop_ep_quirk() calls in xhci.c as well
> You mean, we can export xhci_add/drop_endpoint()?
I think so, unless you have a better idea.
I prefer exporting the generic add/drop_endpoint functions rather than the vendor specific quirk functions.
-Mathias
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next prev parent reply other threads:[~2021-01-08 14:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 6:24 [PATCH v5] usb: xhci-mtk: fix unreleased bandwidth data Ikjoon Jang
2021-01-07 11:09 ` Mathias Nyman
2021-01-08 2:56 ` Ikjoon Jang
2021-01-08 6:11 ` Chunfeng Yun
2021-01-08 14:46 ` Mathias Nyman [this message]
2021-01-12 5:48 ` Ikjoon Jang
2021-01-14 2:23 ` Chunfeng Yun
2021-01-14 8:29 ` Chunfeng Yun
2021-01-15 2:51 ` Ikjoon Jang
2021-01-19 2:33 ` Chunfeng Yun
2021-01-08 6:34 ` Chunfeng Yun
2021-01-08 10:50 ` Ikjoon Jang
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