This is a note to let you know that I've just added the patch titled
bus: ti-sysc: Use fsleep() instead of usleep_range() in sysc_reset()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bus-ti-sysc-use-fsleep-instead-of-usleep_range-in-sy.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0c277cf05ad4849a9e162f58788607f0787f24d9
Author: Julien Panis <jpanis@xxxxxxxxxxxx>
Date: Mon Aug 21 16:24:18 2023 +0200
bus: ti-sysc: Use fsleep() instead of usleep_range() in sysc_reset()
[ Upstream commit d929b2b7464f95ec01e47f560b1e687482ba8929 ]
The am335x-evm started producing boot errors because of subtle timing
changes:
Unhandled fault: external abort on non-linefetch (0x1008) at 0xf03c1010
...
sysc_reset from sysc_probe+0xf60/0x1514
sysc_probe from platform_probe+0x5c/0xbc
...
The fix consists in using the appropriate sleep function in sysc reset.
For flexible sleeping, fsleep is recommended. Here, sysc delay parameter
can take any value in [0 - 255] us range. As a result, fsleep() should
be used, calling udelay() for a sysc delay lower than 10 us.
Signed-off-by: Julien Panis <jpanis@xxxxxxxxxxxx>
Fixes: e709ed70d122 ("bus: ti-sysc: Fix missing reset delay handling")
Message-ID: <20230821-fix-ti-sysc-reset-v1-1-5a0a5d8fae55@xxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Stable-dep-of: f71f6ff8c1f6 ("bus: ti-sysc: Flush posted write only after srst_udelay")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 70339f73181ea..8d82752c54d40 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1842,8 +1842,7 @@ static int sysc_reset(struct sysc *ddata)
}
if (ddata->cfg.srst_udelay)
- usleep_range(ddata->cfg.srst_udelay,
- ddata->cfg.srst_udelay * 2);
+ fsleep(ddata->cfg.srst_udelay);
if (ddata->post_reset_quirk)
ddata->post_reset_quirk(ddata);
