niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

net: stmmac: Limit FIFO size by hardware capability

Browse source 
Tx/Rx FIFO size is specified by the parameter "{tx,rx}-fifo-depth" from
stmmac_platform layer.

However, these values are constrained by upper limits determined by the
capabilities of each hardware feature. There is a risk that the upper
bits will be truncated due to the calculation, so it's appropriate to
limit them to the upper limit values and display a warning message.

This only works if the hardware capability has the upper limit values.

Fixes: e7877f52fd ("stmmac: Read tx-fifo-depth and rx-fifo-depth from the devicetree")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kunihiko Hayashi 2025-01-27 10:38:19 +09:00 • committed by Paolo Abeni
parent f5fb35a3d6
commit 044f2fbaa2
1 changed files with 15 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View file

@ -7236,6 +7236,21 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
priv->plat->tx_queues_to_use = priv->dma_cap.number_tx_queues;
}
if (priv->dma_cap.rx_fifo_size &&
priv->plat->rx_fifo_size > priv->dma_cap.rx_fifo_size) {
dev_warn(priv->device,
"Rx FIFO size (%u) exceeds dma capability\n",
priv->plat->rx_fifo_size);
priv->plat->rx_fifo_size = priv->dma_cap.rx_fifo_size;
}
if (priv->dma_cap.tx_fifo_size &&
priv->plat->tx_fifo_size > priv->dma_cap.tx_fifo_size) {
dev_warn(priv->device,
"Tx FIFO size (%u) exceeds dma capability\n",
priv->plat->tx_fifo_size);
priv->plat->tx_fifo_size = priv->dma_cap.tx_fifo_size;
}
priv->hw->vlan_fail_q_en =
(priv->plat->flags & STMMAC_FLAG_VLAN_FAIL_Q_EN);
priv->hw->vlan_fail_q = priv->plat->vlan_fail_q;