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net: dwc_eth_qos: Invalidate RX descriptor before reading

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The current code polls the RX desciptor ring for new packets by reading
the RX descriptor status. This works by accident, as the RX descriptors
are often in non-cacheable memory. However, the driver does support use
of RX descriptors in cacheable memory.

This patch adds a missing RX descriptor invalidation, which assures the
CPU will read a fresh copy of the RX descriptor instead of a cached one.

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 02:09:21 +01:00 committed by marex
parent dd90c2e1ea
commit 738ee270fe
1 changed files with 1 additions and 0 deletions
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1
drivers/net/dwc_eth_qos.c
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@ -1443,6 +1443,7 @@ static int eqos_recv(struct udevice *dev, int flags, uchar **packetp)
debug("%s(dev=%p, flags=%x):\n", __func__, dev, flags);
rx_desc = &(eqos->rx_descs[eqos->rx_desc_idx]);
eqos->config->ops->eqos_inval_desc(rx_desc);
if (rx_desc->des3 & EQOS_DESC3_OWN) {
debug("%s: RX packet not available\n", __func__);
return -EAGAIN;