[U-Boot] [PATCH v2] net: macb: Fix rx buffer cache handling

[Stefan Roese]

With commit c6d07bf440bc ("net/macb: increase RX buffer size for GEM")
ethernet support does not work any more with d-cache enabled on the
AT91SAM. The reason is, that MACB_RX_BUFFER_SIZE was changed from 4096
to 128 but this change was not refected in the rx_buffer flush and
invalidate functions, as these also use this macro.

This patch now fixes this by calculating the rx buffer size correctly
again in those functions. With this change, ethernet works again
reliably on my AT91SAM board.

Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Ramon Fried <rfried.dev at gmail.com>
Cc: Eugen Hristev <eugen.hristev at microchip.com>
Cc: Anup Patel <anup.patel at wdc.com>
Cc: Bin Meng <bmeng.cn at gmail.com>
Cc: Joe Hershberger <joe.hershberger at ni.com>
---
v2:
- Use macb->rx_buffer_size instead of fixed MACB_RX_BUFFER_SIZE in rx
  buffer invalidate/flush functions as to correctly handle the GEM
  buffer sizes and not only MACB (suggested by Bin)

 drivers/net/macb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index c99cf663a4..a6d7b8ae8d 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -296,13 +296,15 @@ static inline void macb_flush_ring_desc(struct macb_device *macb, bool rx)
 static inline void macb_flush_rx_buffer(struct macb_device *macb)
 {
 	flush_dcache_range(macb->rx_buffer_dma, macb->rx_buffer_dma +
-			   ALIGN(MACB_RX_BUFFER_SIZE, PKTALIGN));
+			   ALIGN(macb->rx_buffer_size * MACB_RX_RING_SIZE,
+				 PKTALIGN));
 }
 
 static inline void macb_invalidate_rx_buffer(struct macb_device *macb)
 {
 	invalidate_dcache_range(macb->rx_buffer_dma, macb->rx_buffer_dma +
-				ALIGN(MACB_RX_BUFFER_SIZE, PKTALIGN));
+				ALIGN(macb->rx_buffer_size * MACB_RX_RING_SIZE,
+				      PKTALIGN));
 }
 
 #if defined(CONFIG_CMD_NET)
-- 
2.23.0