diff options
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c index 116151cd6a95..577316de6ba8 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c @@ -213,7 +213,17 @@ static void dwmac4_dma_chan_op_mode(void __iomem *ioaddr, int txmode, else mtl_tx_op |= MTL_OP_MODE_TTC_512; } - + /* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO + * with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE. + * For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W + * with reset values: TXQEN off, TQS 256 bytes. + * + * Write the bits in both cases, since it will have no effect when RO. + * For DWC_EQOS_NUM_TXQ > 1, the top bits in MTL_OP_MODE_TQS_MASK might + * be RO, however, writing the whole TQS field will result in a value + * equal to DWC_EQOS_TXFIFO_SIZE, just like for DWC_EQOS_NUM_TXQ == 1. + */ + mtl_tx_op |= MTL_OP_MODE_TXQEN | MTL_OP_MODE_TQS_MASK; writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel)); mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel)); |