[PATCH 06/15] net: sun8i_emac: Improve cache maintenance on RX descriptor init

[Andre Przywara]

Before we initialise the RX descriptors, there is no need to *clean*
them from the cache, as we touch them for the first time.
However we should cover the case that those buffers contain dirty cache
lines, which could be evicted and written back to DRAM any time later,
in the worst case *after* the MAC has transferred a packet into them.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 drivers/net/sun8i_emac.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 1eafb66698..44ec8f3a63 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -383,16 +383,21 @@ static void rx_descs_init(struct emac_eth_dev *priv)
 	struct emac_dma_desc *desc_p;
 	u32 idx;
 
-	/* flush Rx buffers */
-	flush_dcache_range((uintptr_t)rxbuffs, (ulong)rxbuffs +
-			RX_TOTAL_BUFSIZE);
+	/*
+	 * Make sure we don't have dirty cache lines around, which could
+	 * be cleaned to DRAM *after* the MAC has already written data to it.
+	 */
+	invalidate_dcache_range((uintptr_t)desc_table_p,
+			      (uintptr_t)desc_table_p + sizeof(priv->rx_chain));
+	invalidate_dcache_range((uintptr_t)rxbuffs,
+				(uintptr_t)rxbuffs + sizeof(priv->rxbuffer));
 
 	for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
 		desc_p = &desc_table_p[idx];
 		desc_p->buf_addr = (uintptr_t)&rxbuffs[idx * CONFIG_ETH_BUFSIZE]
 			;
 		desc_p->next = (uintptr_t)&desc_table_p[idx + 1];
-		desc_p->ctl_size |= CONFIG_ETH_RXSIZE;
+		desc_p->ctl_size = CONFIG_ETH_RXSIZE;
 		desc_p->status = EMAC_DESC_OWN_DMA;
 	}
 
-- 
2.17.5