linux-kernel - [PATCH v3] bus: omap_l3_smx: identify timeout cause before rebooting

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Message-Id: <20230801192240.1063764-1-absicsz@gmail.com>
Date:   Tue,  1 Aug 2023 21:22:40 +0200
From:   "Sicelo A. Mhlongo" <absicsz@...il.com>
To:     linux-omap@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, maemo-leste@...ts.dyne.org,
        "Sicelo A. Mhlongo" <absicsz@...il.com>
Subject: [PATCH v3] bus: omap_l3_smx: identify timeout cause before rebooting

Identify and print the error source before rebooting the board due to an l3
timeout error. This is helpful when debugging, e.g. via serial.

Signed-off-by: Sicelo A. Mhlongo <absicsz@...il.com>
---
 drivers/bus/omap_l3_smx.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/bus/omap_l3_smx.c b/drivers/bus/omap_l3_smx.c
index bb1606f5ce2d..8e1a38bfcd8b 100644
--- a/drivers/bus/omap_l3_smx.c
+++ b/drivers/bus/omap_l3_smx.c
@@ -166,19 +166,10 @@ static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
 	irqreturn_t ret = IRQ_NONE;
 
 	int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
-	if (!int_type) {
+	if (!int_type)
 		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
-		/*
-		 * if we have a timeout error, there's nothing we can
-		 * do besides rebooting the board. So let's BUG on any
-		 * of such errors and handle the others. timeout error
-		 * is severe and not expected to occur.
-		 */
-		BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
-	} else {
+	else
 		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
-		/* No timeout error for debug sources */
-	}
 
 	/* identify the error source */
 	err_source = __ffs(status);
@@ -190,6 +181,14 @@ static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
 		ret |= omap3_l3_block_irq(l3, error, error_addr);
 	}
 
+	/*
+	 * if we have a timeout error, there's nothing we can
+	 * do besides rebooting the board. So let's BUG on any
+	 * of such errors and handle the others. timeout error
+	 * is severe and not expected to occur.
+	 */
+	BUG_ON(!int_type && status & L3_STATUS_0_TIMEOUT_MASK);
+
 	/* Clear the status register */
 	clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
 		L3_AGENT_STATUS_CLEAR_TA;
-- 
2.40.1