netdev - [PATCH net v5 2/2] net: ti: icssg-prueth: Fix clearing of IEP_CMP_CFG registers during iep

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Message-ID: <20241223151550.237680-3-m-malladi@ti.com>
Date: Mon, 23 Dec 2024 20:45:50 +0530
From: Meghana Malladi <m-malladi@...com>
To: <u.kleine-koenig@...libre.com>, <robh@...nel.org>,
        <matthias.schiffer@...tq-group.com>, <jan.kiszka@...mens.com>,
        <dan.carpenter@...aro.org>, <m-malladi@...com>,
        <javier.carrasco.cruz@...il.com>, <diogo.ivo@...mens.com>,
        <jacob.e.keller@...el.com>, <horms@...nel.org>, <pabeni@...hat.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <davem@...emloft.net>,
        <andrew+netdev@...n.ch>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        Vignesh Raghavendra
	<vigneshr@...com>,
        Roger Quadros <rogerq@...nel.org>, <danishanwar@...com>
Subject: [PATCH net v5 2/2] net: ti: icssg-prueth: Fix clearing of IEP_CMP_CFG registers during iep_init

When ICSSG interfaces are brought down and brought up again, the
pru cores are shut down and booted again, flushing out all the memories
and start again in a clean state. Hence it is expected that the
IEP_CMP_CFG register needs to be flushed during iep_init() to ensure
that the existing residual configuration doesn't cause any unusual
behavior. If the register is not cleared, existing IEP_CMP_CFG set for
CMP1 will result in SYNC0_OUT signal based on the SYNC_OUT register values.

After bringing the interface up, calling PPS enable doesn't work as
the driver believes PPS is already enabled, (iep->pps_enabled is not
cleared during interface bring down) and driver will just return true
even though there is no signal. Fix this by disabling pps and perout.

Fixes: c1e0230eeaab ("net: ti: icss-iep: Add IEP driver")
Signed-off-by: Meghana Malladi <m-malladi@...com>
Reviewed-by: Roger Quadros <rogerq@...nel.org>
---

Hi all,

This patch is based on net-next tagged next-20241211
v4: https://lore.kernel.org/all/20241211135941.1800240-3-m-malladi@ti.com/

* Changes since v4 (v5-v4):
- Removed additional blank line as suggested by Dan Carpenter <dan.carpenter@...aro.org>
* Changes since v2 (v4-v2):
- Collected Reviewed-by tag from Roger Quadros <rogerq@...nel.org>

 drivers/net/ethernet/ti/icssg/icss_iep.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/ti/icssg/icss_iep.c b/drivers/net/ethernet/ti/icssg/icss_iep.c
index 5d6d1cf78e93..768578c0d958 100644
--- a/drivers/net/ethernet/ti/icssg/icss_iep.c
+++ b/drivers/net/ethernet/ti/icssg/icss_iep.c
@@ -215,6 +215,9 @@ static void icss_iep_enable_shadow_mode(struct icss_iep *iep)
 	for (cmp = IEP_MIN_CMP; cmp < IEP_MAX_CMP; cmp++) {
 		regmap_update_bits(iep->map, ICSS_IEP_CMP_STAT_REG,
 				   IEP_CMP_STATUS(cmp), IEP_CMP_STATUS(cmp));
+
+		regmap_update_bits(iep->map, ICSS_IEP_CMP_CFG_REG,
+				   IEP_CMP_CFG_CMP_EN(cmp), 0);
 	}
 
 	/* enable reset counter on CMP0 event */
@@ -780,6 +783,11 @@ int icss_iep_exit(struct icss_iep *iep)
 	}
 	icss_iep_disable(iep);
 
+	if (iep->pps_enabled)
+		icss_iep_pps_enable(iep, false);
+	else if (iep->perout_enabled)
+		icss_iep_perout_enable(iep, NULL, false);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(icss_iep_exit);
-- 
2.25.1