[U-Boot] [PATCH 1/4] net: sun8i_emac: Fix DMA alignment issues with the rx / tx buffers

[Hans de Goede]

This fixes the following CACHE warnings when using sun8i_emac:

=> dhcp
BOOTP broadcast 1
BOOTP broadcast 2
CACHE: Misaligned operation at range [7bf594a8, 7bf59628]
BOOTP broadcast 3
CACHE: Misaligned operation at range [7bf59c90, 7bf59e10]
CACHE: Misaligned operation at range [7bf5a478, 7bf5a5f8]
DHCP client bound to address 10.42.43.80 (1009 ms)

Cc: Chen-Yu Tsai <wens at csie.org>
Cc: Corentin LABBE <clabbe.montjoie at gmail.com>
Cc: Amit Singh Tomar <amittomer25 at gmail.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/net/sun8i_emac.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 7c088c3..877859c 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -32,7 +32,8 @@
 
 #define CONFIG_TX_DESCR_NUM	32
 #define CONFIG_RX_DESCR_NUM	32
-#define CONFIG_ETH_BUFSIZE	2024
+#define CONFIG_ETH_BUFSIZE	2048
+#define CONFIG_ETH_RXSIZE	2024 /* Note most fit in ETH_BUFSIZE */
 
 #define TX_TOTAL_BUFSIZE	(CONFIG_ETH_BUFSIZE * CONFIG_TX_DESCR_NUM)
 #define RX_TOTAL_BUFSIZE	(CONFIG_ETH_BUFSIZE * CONFIG_RX_DESCR_NUM)
@@ -324,7 +325,7 @@ static void rx_descs_init(struct emac_eth_dev *priv)
 		desc_p->buf_addr = (uintptr_t)&rxbuffs[idx * CONFIG_ETH_BUFSIZE]
 			;
 		desc_p->next = (uintptr_t)&desc_table_p[idx + 1];
-		desc_p->st |= CONFIG_ETH_BUFSIZE;
+		desc_p->st |= CONFIG_ETH_RXSIZE;
 		desc_p->status = BIT(31);
 	}
 
@@ -506,7 +507,7 @@ static int _sun8i_eth_recv(struct emac_eth_dev *priv, uchar **packetp)
 					roundup(data_end,
 						ARCH_DMA_MINALIGN));
 		if (good_packet) {
-			if (length > CONFIG_ETH_BUFSIZE) {
+			if (length > CONFIG_ETH_RXSIZE) {
 				printf("Received packet is too big (len=%d)\n",
 				       length);
 				return -EMSGSIZE;
-- 
2.7.4