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 2D803309F09; Mon, 13 Apr 2026 16:28:07 +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=1776097687; cv=none; b=corw7w6CRPLcwuB9e8ybEX3vCxvVS8rr6Gsr39sllbaGfwv5Q4fzS2aplSBmXEZSCourGjifQVmV+qjh9lXRGUJwholPBp6qaGgNM/kkvwc+yJFuQf/ipaY/WMsN+wrxA4RGLD6PMo+7MCdNYjCA3e3xcqy5zmWtHpxj4HgccyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776097687; c=relaxed/simple; bh=7M+DyC4uaE3E/yq6DUkbuIrkaumDHBVphZUwmfXuT2Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HOxlD7rPhGeGiX+ZC6m0mAOvXTP2/jBK+o7w+aZGbSjinZ0DV4ngH5ux7oRtaOH61OfBApsiRGwagUaI94yhyldNvja8I8Wh6MZaOWMw+9aHExkoVeg/nhuIIwDHPQgKjZN1VjwdZQcBlL3a+KAKgd3fVQsum7uTk59SzAvrNCI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=h4BZrt0y; 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="h4BZrt0y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7663C2BCAF; Mon, 13 Apr 2026 16:28:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776097687; bh=7M+DyC4uaE3E/yq6DUkbuIrkaumDHBVphZUwmfXuT2Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h4BZrt0yt+g8/3Z8KVW+ba3MS0u/zvIjvlkAwFsdXVS9yJRRfAkx3U/4loEXsuQNg FKmHnf0ErU/uIZzVVNQISS59k3lcdLugNT5jHraAMEU2PNt7czBbU396zXR0pC49wL 51Y6ZUzZ29xi5shw6qZ7m20UYbv6YTqXLjIIJafY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Adrian Hunter , Frank Li , Alexandre Belloni Subject: [PATCH 5.15 191/570] i3c: mipi-i3c-hci: Restart DMA ring correctly after dequeue abort Date: Mon, 13 Apr 2026 17:55:22 +0200 Message-ID: <20260413155837.614639368@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Adrian Hunter commit b6d586431ae20d5157ee468d0ef62ad26798ef13 upstream. The DMA dequeue path attempts to restart the ring after aborting an in-flight transfer, but the current sequence is incomplete. The controller must be brought out of the aborted state and the ring control registers must be programmed in the correct order: first clearing ABORT, then re-enabling the ring and asserting RUN_STOP to resume operation. Add the missing controller resume step and update the ring control writes so that the ring is restarted using the proper sequence. 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/20260306072451.11131-11-adrian.hunter@intel.com Signed-off-by: Alexandre Belloni Signed-off-by: Greg Kroah-Hartman --- drivers/i3c/master/mipi-i3c-hci/dma.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -491,7 +491,9 @@ static bool hci_dma_dequeue_xfer(struct } /* restart the ring */ + mipi_i3c_hci_resume(hci); rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE); + rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE | RING_CTRL_RUN_STOP); return did_unqueue; }