From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>
Cc: Conor Dooley <conor+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Mathias Nyman <mathias.nyman@intel.com>,
linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Eddie Hung <eddie.hung@mediatek.com>,
Macpaul Lin <macpaul.lin@mediatek.com>
Subject: Re: [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue
Date: Thu, 28 Dec 2023 12:44:15 +0200 [thread overview]
Message-ID: <1718f25d-3274-3e4d-0cdf-72fda8788e39@linux.intel.com> (raw)
In-Reply-To: <20231227060316.8539-1-chunfeng.yun@mediatek.com>
Hi
On 27.12.2023 8.03, Chunfeng Yun wrote:
> For Gen1 isoc-in endpoint on controller before about SSUSB IPM v1.6.0, it
> still send out unexpected ACK after receiving a short packet in burst
> transfer, this will cause an exception on connected device, specially for
> a 4k camera.
> Add a quirk property "rx-fifo-depth" to work around this hardware issue,
> prefer to use 3k bytes;
> The side-effect is that may cause performance drop about 10%, including
> bulk transfer.
Is it be possible to detect those Mediatek xHC versions that need this
workaround in the xhci-mtk driver directly?
This way we could avoid passing a new "rx-fifo-depth" property to it.
Thanks
Mathias
next prev parent reply other threads:[~2023-12-28 10:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-27 6:03 [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue Chunfeng Yun
2023-12-27 6:03 ` [PATCH v4 2/3] usb: xhci-mtk: fix a short packet issue of gen1 isoc-in transfer Chunfeng Yun
2023-12-27 6:03 ` [PATCH v4 3/3] arm64: dts: mediatek: mt8195: Add 'rx-fifo-depth' for cherry Chunfeng Yun
2023-12-27 9:19 ` [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue Sergey Shtylyov
2024-01-04 7:24 ` Chunfeng Yun (云春峰)
2023-12-28 10:44 ` Mathias Nyman [this message]
2024-01-04 6:12 ` Chunfeng Yun (云春峰)
2024-01-02 9:31 ` AngeloGioacchino Del Regno
2024-01-02 21:03 ` Krzysztof Kozlowski
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