can: ti_hecc: add missing state changes

While the ti_hecc has interrupts to report when the error counters increase
to a certain level and which change state it doesn't handle the case that
the error counters go down again, so the reported state can actually be
wrong. Since there is no interrupt for that, do update state based on the
error counters, when the state is not error active and goes down again.

Signed-off-by: Jeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 4c6d3ce0e8c478412110722aae901febfced78fa..31ad364a89bbe61295b63d83f719a1888642a3e3 100644 (file)
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -711,6 +711,23 @@ static irqreturn_t ti_hecc_interrupt(int irq, void *dev_id)
                        can_bus_off(ndev);
                        ti_hecc_change_state(ndev, rx_state, tx_state);
                }
+       } else if (unlikely(priv->can.state != CAN_STATE_ERROR_ACTIVE)) {
+               enum can_state new_state, tx_state, rx_state;
+               u32 rec = hecc_read(priv, HECC_CANREC);
+               u32 tec = hecc_read(priv, HECC_CANTEC);
+
+               if (rec >= 128 || tec >= 128)
+                       new_state = CAN_STATE_ERROR_PASSIVE;
+               else if (rec >= 96 || tec >= 96)
+                       new_state = CAN_STATE_ERROR_WARNING;
+               else
+                       new_state = CAN_STATE_ERROR_ACTIVE;
+
+               if (new_state < priv->can.state) {
+                       rx_state = rec >= tec ? new_state : 0;
+                       tx_state = rec <= tec ? new_state : 0;
+                       ti_hecc_change_state(ndev, rx_state, tx_state);
+               }
        }
 
        if (int_status & HECC_CANGIF_GMIF) {