diff options
| -rw-r--r-- | drivers/net/dwc_eth_qos.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c index 74cdaa27644..08332210afb 100644 --- a/drivers/net/dwc_eth_qos.c +++ b/drivers/net/dwc_eth_qos.c @@ -1011,12 +1011,17 @@ static int eqos_start(struct udevice *dev) setbits_le32(&eqos->mac_regs->configuration, EQOS_MAC_CONFIGURATION_TE | EQOS_MAC_CONFIGURATION_RE); - /* TX tail pointer not written until we need to TX a packet */ /* - * Point RX tail pointer at last descriptor. Ideally, we'd point at the - * first descriptor, implying all descriptors were available. However, - * that's not distinguishable from none of the descriptors being - * available. + * Point TX tail pointer at the first descriptor, implying no descriptor + * are owned by the DMA. We advance the tail pointer when we need to TX + * a packet in eqos_send(). + */ + addr64 = (ulong)eqos_get_desc(eqos, 0, false); + writel(lower_32_bits(addr64), &eqos->dma_regs->ch0_txdesc_tail_pointer); + + /* + * Point RX tail pointer at the last descriptor, implying all + * descriptors are owned by the DMA. */ addr64 = (ulong)eqos_get_desc(eqos, EQOS_DESCRIPTORS_RX - 1, true); writel(lower_32_bits(addr64), &eqos->dma_regs->ch0_rxdesc_tail_pointer); |