From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BAA852F361F for ; Tue, 17 Mar 2026 14:45:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773758750; cv=none; b=lwXMNWQ1ITlFevY+kjtBJonMk9P2Wc22pRELNotkXLb1wveqUQoO+D34Hbr4d9HmuadehBtv8rHrOlgF/wCu1WGnyebWO8fOMi+JR8nZHiz2wWEbQdJSsLxnR1kddx/FiwYkxXr6j6w8TdVKWQNeBmAQQN/mc/F/VD8wADIn3hI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773758750; c=relaxed/simple; bh=poSPviOSMDp57XeWBULrCqlm975MWMRYVjY+Bvs5qKE=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=Y+XxW8ADY7fXqMo3mRZZaMwXW7ApqzV57MtY2XhRFmvi2Dk7UZ60GbD+rF3zf7uaVPjR8giScMx1UQdTrp0bCKLbdwVby3nAKDxIhcDCmTTWDLzijVBu+265Wf6PN8Uysq9gMWdObrZlrn/A+/uOd3xKh4wA1g18wEQSd+na4Z8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nP1fjvhM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nP1fjvhM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE82DC19424; Tue, 17 Mar 2026 14:45:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1773758750; bh=poSPviOSMDp57XeWBULrCqlm975MWMRYVjY+Bvs5qKE=; h=Subject:To:Cc:From:Date:From; b=nP1fjvhMbpW/TzcfGIUKG+Htyo31u9iksz9gAIsFaonX28BjAof8MHgLQ3q/gLoPk LwGc60fv60fkyVzsz7u/ECMOR2UD/0yYquX/G2WXZBWFakpoHO7V06PbVAY9w3y9x3 ewvrYJxtemo5qsIVui9xzNBIltOgy9yMNbNkQJJI= Subject: FAILED: patch "[PATCH] i3c: mipi-i3c-hci: Fix Hot-Join NACK" failed to apply to 5.15-stable tree To: adrian.hunter@intel.com,Frank.Li@nxp.com,alexandre.belloni@bootlin.com Cc: From: Date: Tue, 17 Mar 2026 15:45:30 +0100 Message-ID: <2026031730-blast-unbent-449d@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x fa9586bd77ada1e3861c7bef65f6bb9dcf8d9481 # git commit -s git send-email --to '' --in-reply-to '2026031730-blast-unbent-449d@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From fa9586bd77ada1e3861c7bef65f6bb9dcf8d9481 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 6 Mar 2026 09:24:39 +0200 Subject: [PATCH] i3c: mipi-i3c-hci: Fix Hot-Join NACK The MIPI I3C HCI host controller driver does not implement Hot-Join handling, yet Hot-Join response control defaults to allowing devices to Hot-Join the bus. Configure HC_CONTROL_HOT_JOIN_CTRL to NACK all Hot-Join attempts. Fixes: 9ad9a52cce282 ("i3c/master: introduce the mipi-i3c-hci driver") Cc: stable@vger.kernel.org Signed-off-by: Adrian Hunter Reviewed-by: Frank Li Link: https://patch.msgid.link/20260306072451.11131-3-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index dbe93df0c70e..4877a321edf9 100644 --- a/drivers/i3c/master/mipi-i3c-hci/core.c +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -152,7 +152,8 @@ static int i3c_hci_bus_init(struct i3c_master_controller *m) if (hci->quirks & HCI_QUIRK_RESP_BUF_THLD) amd_set_resp_buf_thld(hci); - reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE); + /* Enable bus with Hot-Join disabled */ + reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL); dev_dbg(&hci->master.dev, "HC_CONTROL = %#x", reg_read(HC_CONTROL)); return 0; @@ -764,7 +765,8 @@ static int i3c_hci_runtime_resume(struct device *dev) hci->io->resume(hci); - reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE); + /* Enable bus with Hot-Join disabled */ + reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL); return 0; }