diff options
| author | Joel Stanley <joel@jms.id.au> | 2019-12-12 01:32:01 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2019-12-12 01:32:06 +0300 |
| commit | fdc60468f3e452364d432f1a7c3f83d58bba1b84 (patch) | |
| tree | de7197f150958ae72cb87b6cf4885610f3edd704 /drivers/net/can/c_can/c_can.c | |
| parent | 20572eecd7248b66d855a8e4812debd9f828ccba (diff) | |
| parent | 8539dfa4fcbcf58c3c2f92ac57b964add884d12b (diff) | |
| download | linux-dev-5.3.tar.xz | |
Merge tag 'v5.3.15' into dev-5.3dev-5.3
This is the 5.3.15 stable release
Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/net/can/c_can/c_can.c')
| -rw-r--r-- | drivers/net/can/c_can/c_can.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c index 9b61bfbea6cd..24c6015f6c92 100644 --- a/drivers/net/can/c_can/c_can.c +++ b/drivers/net/can/c_can/c_can.c @@ -52,6 +52,7 @@ #define CONTROL_EX_PDR BIT(8) /* control register */ +#define CONTROL_SWR BIT(15) #define CONTROL_TEST BIT(7) #define CONTROL_CCE BIT(6) #define CONTROL_DISABLE_AR BIT(5) @@ -572,6 +573,26 @@ static void c_can_configure_msg_objects(struct net_device *dev) IF_MCONT_RCV_EOB); } +static int c_can_software_reset(struct net_device *dev) +{ + struct c_can_priv *priv = netdev_priv(dev); + int retry = 0; + + if (priv->type != BOSCH_D_CAN) + return 0; + + priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_SWR | CONTROL_INIT); + while (priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_SWR) { + msleep(20); + if (retry++ > 100) { + netdev_err(dev, "CCTRL: software reset failed\n"); + return -EIO; + } + } + + return 0; +} + /* * Configure C_CAN chip: * - enable/disable auto-retransmission @@ -581,6 +602,11 @@ static void c_can_configure_msg_objects(struct net_device *dev) static int c_can_chip_config(struct net_device *dev) { struct c_can_priv *priv = netdev_priv(dev); + int err; + + err = c_can_software_reset(dev); + if (err) + return err; /* enable automatic retransmission */ priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_ENABLE_AR); |