Date: Wed, 19 Nov 2025 18:20:25 +0000 From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Cc: Poul-Henning Kamp <phk@FreeBSD.org> Subject: git: d61be9d99470 - stable/15 - iichid: The IICHID spec defines the response to the RESET command as two bytes of zeros. Message-ID: <691e0a69.d3cc.7d8aab3c@gitrepo.freebsd.org>
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The branch stable/15 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=d61be9d994702ffb8443c686f3ae2a5c702df3c7 commit d61be9d994702ffb8443c686f3ae2a5c702df3c7 Author: Poul-Henning Kamp <phk@FreeBSD.org> AuthorDate: 2025-11-18 19:22:01 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2025-11-19 18:20:09 +0000 iichid: The IICHID spec defines the response to the RESET command as two bytes of zeros. Our recent changes to iichid.c has caused us to attempt to read a full REPORT instead, and at least one keyboard hangs solid when we do that. This patch changes us to be spec-compliant. Differential Revision: https://reviews.freebsd.org/D53803 MFC after: 1 day Approved by: re(ccperciva) (cherry picked from commit 5d53462af1d0e892da77b52b701b337119b2f5d7) --- sys/dev/iicbus/iichid.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/sys/dev/iicbus/iichid.c b/sys/dev/iicbus/iichid.c index 5ca3f1b84e48..430066bd8f52 100644 --- a/sys/dev/iicbus/iichid.c +++ b/sys/dev/iicbus/iichid.c @@ -271,6 +271,8 @@ static int iichid_cmd_read(struct iichid_softc* sc, void *buf, iichid_size_t maxlen, iichid_size_t *actual_len) { + int error; + /* * 6.1.3 - Retrieval of Input Reports * DEVICE returns the length (2 Bytes) and the entire Input Report. @@ -280,7 +282,10 @@ iichid_cmd_read(struct iichid_softc* sc, void *buf, iichid_size_t maxlen, struct iic_msg msgs[] = { { sc->addr, IIC_M_RD, maxlen, buf }, }; - int error; + + if (!sc->reset_acked) { + msgs[0].len = 2; + } error = iicbus_transfer(sc->dev, msgs, nitems(msgs)); if (error != 0)help
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