From: sashiko-bot@kernel.org
To: "Fabrice Gasnier" <fabrice.gasnier@foss.st.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: [PATCH v2 2/2] usb: dwc2: wa for isoc packet tx fifo flush at periodic frame boundary
Date: Wed, 04 Nov 2026 13:23:45 +0000 [thread overview]
Message-ID: <sashiko-outbox-197337@kernel.org> (raw)
In-Reply-To: <20261104-dwc2-fifo-fixes-v2-v2-2-2bb13820f662@foss.st.com>
> If an isochronous packet is still being transmitted, when the end of
> periodic frame interval elapses, using dma desc on dwc2 controller,
> the device wrongly flushes the pending packets from the tx fifo.
> This can lead to a huge packet is sent on the bus, leading to the host
> finally reset the bus, and re-enumerate it.
>
> Workaround it by tuning the periodic frame interval limit from 80% to 95%,
> on the affected cores (2.70a to 4.00a). It makes the issue very unlikely
> to occur.
>
> Fixes: 540ccba08599 ("usb: dwc2: gadget: Start and complete DDMA isoc transfers")
> Cc: stable@vger.kernel.org
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261104-dwc2-fifo-fixes-v2-v2-0-2bb13820f662@foss.st.com?part=2
next prev parent reply other threads:[~2026-11-04 13:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-04 13:20 [PATCH v2 0/2] usb: dwc2: fix fifo reinit and workaround for isoc tx packet Fabrice Gasnier
2026-11-04 13:20 ` [PATCH v2 1/2] usb: dwc2: fix fifo reinit in dwc2_hsotg_core_init_disconnected Fabrice Gasnier
2026-11-04 13:24 ` sashiko-bot
2026-11-04 13:20 ` [PATCH v2 2/2] usb: dwc2: wa for isoc packet tx fifo flush at periodic frame boundary Fabrice Gasnier
2026-11-04 13:23 ` sashiko-bot [this message]
2026-11-05 1:27 ` Thinh Nguyen
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