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Change error code to EAGAIN to inform the client driver that this situation has occurred and to try again sometime later. Fixes: 5e5e3c92e748 ("i3c: master: svc: fix wrong data return when IBI happen during start frame") Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 5ee4db68988e2..a2298ab460a37 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -1080,7 +1080,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master, * and yield the above events handler. */ if (SVC_I3C_MSTATUS_IBIWON(reg)) { - ret = -ENXIO; + ret = -EAGAIN; *actual_len = 0; goto emit_stop; } From patchwork Wed Apr 24 19:00:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 13642400 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2082.outbound.protection.outlook.com [40.107.22.82]) (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 903D91C697 for ; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7aa66eca-0268-4396-1d20-08dc6490dbe3 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9642.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2024 19:00:50.8295 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: RzihTBMi/xtlsytgkymG2jUSvnjp0IMwPnMUL5ksucqsJG3ln79kI4M6ICZHSUKbfOkH9/5YZbgw3OgF3Bygyg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8617 In an In-Band Interrupt (IBI) handle, the code logic is as follows: 1: writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI | SVC_I3C_MCTRL_IBIRESP_AUTO, master->regs + SVC_I3C_MCTRL); 2: ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, SVC_I3C_MSTATUS_IBIWON(val), 0, 1000); ... 3: ibitype = SVC_I3C_MSTATUS_IBITYPE(status); ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status); SVC_I3C_MSTATUS_IBIWON may be set before step 1. Thus, step 2 will return immediately, and the I3C controller has not sent out the 9th SCL yet. Consequently, ibitype and ibiaddr are 0, resulting in an unknown IBI type occurrence and missing call I3C client driver's IBI handler. A typical case is that SVC_I3C_MSTATUS_IBIWON is set when an IBI occurs during the controller send start frame in svc_i3c_master_xfer(). Clear SVC_I3C_MSTATUS_IBIWON before issue SVC_I3C_MCTRL_REQUEST_AUTO_IBI to fix this issue. Cc: stable@vger.kernel.org Fixes: 5e5e3c92e748 ("i3c: master: svc: fix wrong data return when IBI happen during start frame") Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index a2298ab460a37..3bfe8e694f840 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -415,6 +415,9 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) int ret; mutex_lock(&master->lock); + /* Clear the interrupt status */ + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + /* Acknowledge the incoming interrupt with the AUTOIBI mechanism */ writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI | SVC_I3C_MCTRL_IBIRESP_AUTO, @@ -429,9 +432,6 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) goto reenable_ibis; } - /* Clear the interrupt status */ - writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); - status = readl(master->regs + SVC_I3C_MSTATUS); ibitype = SVC_I3C_MSTATUS_IBITYPE(status); ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status);