FAILED: patch "[PATCH] i3c: master: svc: Modify enabled_events bit 7:0 to act as IBI" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

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 25bc99be5fe53853053ceeaa328068c49dc1e799
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024120644-desolate-caterer-afb9@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 25bc99be5fe53853053ceeaa328068c49dc1e799 Mon Sep 17 00:00:00 2001
From: Frank Li <Frank.Li@nxp.com>
Date: Fri, 1 Nov 2024 12:50:02 -0400
Subject: [PATCH] i3c: master: svc: Modify enabled_events bit 7:0 to act as IBI
 enable counter

Fix issue where disabling IBI on one device disables the entire IBI
interrupt. Modify bit 7:0 of enabled_events to serve as an IBI enable
counter, ensuring that the system IBI interrupt is disabled only when all
I3C devices have IBI disabled.

Cc: stable@kernel.org
Fixes: 7ff730ca458e ("i3c: master: svc: enable the interrupt in the enable ibi function")
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20241101165002.2479794-1-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 c53f2b27662f..c1ee3828e7ee 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -130,8 +130,8 @@
 #define SVC_I3C_PPBAUD_MAX 15
 #define SVC_I3C_QUICK_I2C_CLK 4170000
 
-#define SVC_I3C_EVENT_IBI	BIT(0)
-#define SVC_I3C_EVENT_HOTJOIN	BIT(1)
+#define SVC_I3C_EVENT_IBI	GENMASK(7, 0)
+#define SVC_I3C_EVENT_HOTJOIN	BIT(31)
 
 struct svc_i3c_cmd {
 	u8 addr;
@@ -214,7 +214,7 @@ struct svc_i3c_master {
 		spinlock_t lock;
 	} ibi;
 	struct mutex lock;
-	int enabled_events;
+	u32 enabled_events;
 	u32 mctrl_config;
 };
 
@@ -1688,7 +1688,7 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
 		return ret;
 	}
 
-	master->enabled_events |= SVC_I3C_EVENT_IBI;
+	master->enabled_events++;
 	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
 
 	return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
@@ -1700,7 +1700,7 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
 	struct svc_i3c_master *master = to_svc_i3c_master(m);
 	int ret;
 
-	master->enabled_events &= ~SVC_I3C_EVENT_IBI;
+	master->enabled_events--;
 	if (!master->enabled_events)
 		svc_i3c_master_disable_interrupts(master);