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 stable@vger.kernel.org.
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 9aaeef113c55248ecf3ab941c2e4460aaa8b8b9a # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023112301-donation-geology-7740@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
9aaeef113c55 ("i3c: master: svc: fix random hot join failure since timeout error") 49b472ebc61d ("i3c: master: svc: add NACK check after start byte sent")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 9aaeef113c55248ecf3ab941c2e4460aaa8b8b9a Mon Sep 17 00:00:00 2001 From: Frank Li Frank.Li@nxp.com Date: Mon, 23 Oct 2023 12:16:58 -0400 Subject: [PATCH] i3c: master: svc: fix random hot join failure since timeout error MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
master side report: silvaco-i3c-master 44330000.i3c-master: Error condition: MSTATUS 0x020090c7, MERRWARN 0x00100000
BIT 20: TIMEOUT error The module has stalled too long in a frame. This happens when: - The TX FIFO or RX FIFO is not handled and the bus is stuck in the middle of a message, - No STOP was issued and between messages, - IBI manual is used and no decision was made. The maximum stall period is 100 μs.
This can be considered as being just a warning as the system IRQ latency can easily be greater than 100us.
Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver") Cc: stable@vger.kernel.org Signed-off-by: Frank Li Frank.Li@nxp.com Reviewed-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/r/20231023161658.3890811-7-Frank.Li@nxp.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 18843e07d175..b192a8b91e5d 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -93,6 +93,7 @@ #define SVC_I3C_MINTMASKED 0x098 #define SVC_I3C_MERRWARN 0x09C #define SVC_I3C_MERRWARN_NACK BIT(2) +#define SVC_I3C_MERRWARN_TIMEOUT BIT(20) #define SVC_I3C_MDMACTRL 0x0A0 #define SVC_I3C_MDATACTRL 0x0AC #define SVC_I3C_MDATACTRL_FLUSHTB BIT(0) @@ -227,6 +228,14 @@ static bool svc_i3c_master_error(struct svc_i3c_master *master) if (SVC_I3C_MSTATUS_ERRWARN(mstatus)) { merrwarn = readl(master->regs + SVC_I3C_MERRWARN); writel(merrwarn, master->regs + SVC_I3C_MERRWARN); + + /* Ignore timeout error */ + if (merrwarn & SVC_I3C_MERRWARN_TIMEOUT) { + dev_dbg(master->dev, "Warning condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", + mstatus, merrwarn); + return false; + } + dev_err(master->dev, "Error condition: MSTATUS 0x%08x, MERRWARN 0x%08x\n", mstatus, merrwarn);