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net: dwc_eth_qos: Correctly wrap around TX descriptor tail pointer

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This code programs the next descriptor in the TX descriptor ring into
the hardware as the last valid TX descriptor. The problem is that if
the currenty descriptor is the last one in the array, the code will
not wrap around correctly and use TX descriptor 0 again, but instead
will use TX descriptor at address right past the TX descriptor ring,
which is the first descriptor in the RX ring.

Fix this by adding the necessary wrap-around.

Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Cc: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Marek Vasut 2020-03-23 02:03:50 +01:00 committed by marex
parent 4332d80617
commit 83858d8795
1 changed files with 2 additions and 1 deletions
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3
drivers/net/dwc_eth_qos.c
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@ -1419,7 +1419,8 @@ static int eqos_send(struct udevice *dev, void *packet, int length)
tx_desc->des3 = EQOS_DESC3_OWN | EQOS_DESC3_FD | EQOS_DESC3_LD | length;
eqos->config->ops->eqos_flush_desc(tx_desc);
writel((ulong)(tx_desc + 1), &eqos->dma_regs->ch0_txdesc_tail_pointer);
writel((ulong)(&(eqos->tx_descs[eqos->tx_desc_idx])),
&eqos->dma_regs->ch0_txdesc_tail_pointer);
for (i = 0; i < 1000000; i++) {
eqos->config->ops->eqos_inval_desc(tx_desc);