mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-24 15:56:49 +00:00
2464a9a8a4
Refreshed all patches. Compile-tested on: x86_64, ath79, lantiq Runtime-tested on: x86_64, ath79 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
71 lines
3.0 KiB
Diff
71 lines
3.0 KiB
Diff
From 7b294e0cd2f7fbfb548a17b8d68d161da19e6592 Mon Sep 17 00:00:00 2001
|
|
From: Joakim Zhang <qiangqing.zhang@nxp.com>
|
|
Date: Fri, 12 Jul 2019 08:02:56 +0000
|
|
Subject: [PATCH] can: flexcan: add Transceiver Delay Compensation suopport
|
|
|
|
The CAN FD protocol allows the transmission and reception of data at a higher
|
|
bit rate than the nominal rate used in the arbitration phase when the message's
|
|
BRS bit is set.
|
|
|
|
The TDC mechanism is effective only during the data phase of FD frames
|
|
having BRS bit set. It has no effect either on non-FD frames, or on FD
|
|
frames transmitted at normal bit rate.
|
|
|
|
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
|
|
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
|
|
---
|
|
drivers/net/can/flexcan.c | 19 ++++++++++++++++++-
|
|
1 file changed, 18 insertions(+), 1 deletion(-)
|
|
|
|
--- a/drivers/net/can/flexcan.c
|
|
+++ b/drivers/net/can/flexcan.c
|
|
@@ -149,8 +149,11 @@
|
|
|
|
/* FLEXCAN FD control register (FDCTRL) bits */
|
|
#define FLEXCAN_FDCTRL_FDRATE BIT(31)
|
|
+#define FLEXCAN_FDCTRL_TDCEN BIT(15)
|
|
+#define FLEXCAN_FDCTRL_TDCFAIL BIT(14)
|
|
#define FLEXCAN_FDCTRL_MBDSR1(x) (((x) & 0x3) << 19)
|
|
#define FLEXCAN_FDCTRL_MBDSR0(x) (((x) & 0x3) << 16)
|
|
+#define FLEXCAN_FDCTRL_TDCOFF(x) (((x) & 0x1f) << 8)
|
|
|
|
/* FLEXCAN FD Bit Timing register (FDCBT) bits */
|
|
#define FLEXCAN_FDCBT_FPRESDIV(x) (((x) & 0x3ff) << 20)
|
|
@@ -1102,7 +1105,7 @@ static void flexcan_set_bittiming(struct
|
|
struct can_bittiming *bt = &priv->can.bittiming;
|
|
struct can_bittiming *dbt = &priv->can.data_bittiming;
|
|
struct flexcan_regs __iomem *regs = priv->regs;
|
|
- u32 reg, reg_cbt, reg_fdcbt;
|
|
+ u32 reg, reg_cbt, reg_fdcbt, reg_fdctrl;
|
|
|
|
reg = priv->read(®s->ctrl);
|
|
reg &= ~(FLEXCAN_CTRL_LPB | FLEXCAN_CTRL_SMP | FLEXCAN_CTRL_LOM);
|
|
@@ -1174,6 +1177,19 @@ static void flexcan_set_bittiming(struct
|
|
FLEXCAN_FDCBT_FPROPSEG(dbt->prop_seg);
|
|
priv->write(reg_fdcbt, ®s->fdcbt);
|
|
|
|
+ /* enable transceiver delay compensation(TDC) for fd frame.
|
|
+ * TDC must be disabled when Loop Back mode is enabled.
|
|
+ */
|
|
+ reg_fdctrl = priv->read(®s->fdctrl);
|
|
+ if (!(reg & FLEXCAN_CTRL_LPB)) {
|
|
+ reg_fdctrl |= FLEXCAN_FDCTRL_TDCEN;
|
|
+ reg_fdctrl &= ~FLEXCAN_FDCTRL_TDCOFF(0x1f);
|
|
+ /* for the TDC to work reliably, the offset has to use optimal settings */
|
|
+ reg_fdctrl |= FLEXCAN_FDCTRL_TDCOFF(((dbt->phase_seg1 - 1) + dbt->prop_seg + 2) *
|
|
+ ((dbt->brp -1) + 1));
|
|
+ }
|
|
+ priv->write(reg_fdctrl, ®s->fdctrl);
|
|
+
|
|
if (bt->brp != dbt->brp)
|
|
netdev_warn(dev, "Warning!! data brp = %d and brp = %d don't match.\n"
|
|
"flexcan may not work. consider using different bitrate or data bitrate\n",
|
|
@@ -1325,6 +1341,7 @@ static int flexcan_chip_start(struct net
|
|
/* FDCTRL */
|
|
if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
|
|
reg_fdctrl = priv->read(®s->fdctrl) & ~FLEXCAN_FDCTRL_FDRATE;
|
|
+ reg_fdctrl &= ~FLEXCAN_FDCTRL_TDCEN;
|
|
reg_fdctrl &= ~(FLEXCAN_FDCTRL_MBDSR1(0x3) | FLEXCAN_FDCTRL_MBDSR0(0x3));
|
|
reg_mcr = priv->read(®s->mcr) & ~FLEXCAN_MCR_FDEN;
|
|
reg_ctrl2 = priv->read(®s->ctrl2) & ~FLEXCAN_CTRL2_ISOCANFDEN;
|