Date: Wed, 27 Nov 2024 09:24:33 -0500 From: Justin Hibbits <jhibbits@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: 09ef538713e0 - main - uart: Add primitive noise filtering on RX Message-ID: <20241127092433.56704700@ralga.knownspace> In-Reply-To: <202411271417.4AREHTKe014440@gitrepo.freebsd.org> References: <202411271417.4AREHTKe014440@gitrepo.freebsd.org>
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On Wed, 27 Nov 2024 14:17:29 GMT Justin Hibbits <jhibbits@FreeBSD.org> wrote: > The branch main has been updated by jhibbits: > > URL: https://cgit.FreeBSD.org/src/commit/?id=09ef538713e08a98584dbcf66ff80290cc1b41a2 > > commit 09ef538713e08a98584dbcf66ff80290cc1b41a2 > Author: Justin Hibbits <jhibbits@FreeBSD.org> > AuthorDate: 2024-11-20 17:08:26 +0000 > Commit: Justin Hibbits <jhibbits@FreeBSD.org> > CommitDate: 2024-11-27 14:17:09 +0000 > > uart: Add primitive noise filtering on RX > > A long cable attached to the UART can act as an antenna if > disconnected from the other end. This can cause noise on the receive > side, possibly as reflections from the transmit side, leading to an > interrupt storm. Filter this by adding a threshold of received > characters without TX ready, above which characters are dropped. > This is disabled by default, but has been tested with a threshold of > 1000+. A high threshold is recommended to avoid dropping characters > during, for instance, a large copy/paste from the other end. > > Sponsored by: Juniper Networks, Inc. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D47685 - Justin
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