linux-kernel - [PATCH 4.14 41/50] can: m_can: fix nominal bitiming tseg2 min for version >= 3.1

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Message-Id: <20201201084650.146689436@linuxfoundation.org>
Date:   Tue,  1 Dec 2020 09:53:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        Mario Huettel <mario.huettel@....net>,
        Sriram Dash <sriram.dash@...sung.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 41/50] can: m_can: fix nominal bitiming tseg2 min for version >= 3.1

From: Marc Kleine-Budde <mkl@...gutronix.de>

[ Upstream commit e3409e4192535fbcc86a84b7a65d9351f46039ec ]

At lest the revision 3.3.0 of the bosch m_can IP core specifies that valid
register values for "Nominal Time segment after sample point (NTSEG2)" are from
1 to 127. As the hardware uses a value of one more than the programmed value,
mean tseg2_min is 2.

This patch fixes the tseg2_min value accordingly.

Cc: Dan Murphy <dmurphy@...com>
Cc: Mario Huettel <mario.huettel@....net>
Acked-by: Sriram Dash <sriram.dash@...sung.com>
Link: https://lore.kernel.org/r/20201124190751.3972238-1-mkl@pengutronix.de
Fixes: b03cfc5bb0e1 ("can: m_can: Enable M_CAN version dependent initialization")
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/can/m_can/m_can.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 680ee8345211f..a3f2548c5548c 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -972,7 +972,7 @@ static const struct can_bittiming_const m_can_bittiming_const_31X = {
 	.name = KBUILD_MODNAME,
 	.tseg1_min = 2,		/* Time segment 1 = prop_seg + phase_seg1 */
 	.tseg1_max = 256,
-	.tseg2_min = 1,		/* Time segment 2 = phase_seg2 */
+	.tseg2_min = 2,		/* Time segment 2 = phase_seg2 */
 	.tseg2_max = 128,
 	.sjw_max = 128,
 	.brp_min = 1,
-- 
2.27.0