linux-kernel - [PATCH] bus: ti-sysc: Fix external abort for am335x pruss probe

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Date:   Wed, 15 Sep 2021 09:50:32 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Suman Anna <s-anna@...com>
Subject: [PATCH] bus: ti-sysc: Fix external abort for am335x pruss probe

Starting with v5.15-rc1, I'm now seeing am335x beaglebone black produce
the following error on pruss probe:

Unhandled fault: external abort on non-linefetch (0x1008) at 0xe0326000

This seems to have started with the enabling of pruss for am335x in the
dts files. Adding a read-back after write to the sysconfig register fixes
the issue for me.

Cc: Suman Anna <s-anna@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/bus/ti-sysc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -2037,6 +2037,9 @@ static int sysc_reset(struct sysc *ddata)
 		sysc_val = sysc_read_sysconfig(ddata);
 		sysc_val |= sysc_mask;
 		sysc_write(ddata, sysc_offset, sysc_val);
+
+		/* Flush posted write */
+		sysc_read_sysconfig(ddata);
 	}
 
 	if (ddata->cfg.srst_udelay)
-- 
2.33.0