From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org,
kernel@pengutronix.de, Joakim Zhang <qiangqing.zhang@nxp.com>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [net 1/6] can: flexcan: assert FRZ bit in flexcan_chip_freeze()
Date: Mon, 1 Mar 2021 12:20:55 +0100 [thread overview]
Message-ID: <20210301112100.197939-2-mkl@pengutronix.de> (raw)
In-Reply-To: <20210301112100.197939-1-mkl@pengutronix.de>
From: Joakim Zhang <qiangqing.zhang@nxp.com>
Assert HALT bit to enter freeze mode, there is a premise that FRZ bit is
asserted. This patch asserts FRZ bit in flexcan_chip_freeze, although
the reset value is 1b'1. This is a prepare patch, later patch will
invoke flexcan_chip_freeze() to enter freeze mode, which polling freeze
mode acknowledge.
Fixes: b1aa1c7a2165b ("can: flexcan: fix transition from and to freeze mode in chip_{,un}freeze")
Link: https://lore.kernel.org/r/20210218110037.16591-2-qiangqing.zhang@nxp.com
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/flexcan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 971ada36e37f..ee2d4967d66a 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -701,7 +701,7 @@ static int flexcan_chip_freeze(struct flexcan_priv *priv)
u32 reg;
reg = priv->read(®s->mcr);
- reg |= FLEXCAN_MCR_HALT;
+ reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT;
priv->write(reg, ®s->mcr);
while (timeout-- && !(priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
base-commit: 447621e373bd1b22300445639b43c39f399e4c73
--
2.30.1
next prev parent reply other threads:[~2021-03-01 11:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 11:20 pull-request: can 2021-03-01 Marc Kleine-Budde
2021-03-01 11:20 ` Marc Kleine-Budde [this message]
2021-03-01 11:20 ` [net 2/6] can: flexcan: enable RX FIFO after FRZ/HALT valid Marc Kleine-Budde
2021-03-01 11:20 ` [net 3/6] can: flexcan: invoke flexcan_chip_freeze() to enter freeze mode Marc Kleine-Budde
2021-03-16 16:00 ` [BUG] " Ahmad Fatoum
2021-03-17 8:18 ` Marc Kleine-Budde
2021-03-17 11:49 ` Marc Kleine-Budde
2021-03-18 9:23 ` Ahmad Fatoum
2021-03-01 11:20 ` [net 4/6] can: mcp251xfd: revert "can: mcp251xfd: add BQL support" Marc Kleine-Budde
2021-03-01 11:20 ` [net 5/6] can: skb: can_skb_set_owner(): fix ref counting if socket was closed before setting skb ownership Marc Kleine-Budde
2021-03-01 11:21 ` [net 6/6] can: tcan4x5x: tcan4x5x_init(): fix initialization - clear MRAM before entering Normal Mode Marc Kleine-Budde
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