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net/designware: add explicit reset of {tx|rx}_currdescnum 

Driver "init" function might be called multiple times.
On every "init" Tx/Rx buffer descriptors are initialized: "descs_init"
-> "{tx|rx}_descs_init".

In its turn those init functions set MAC's "{tx|rx}desclistaddr" to
point on the first buffer descriptor in the list.

So CPU to start operation from the first buffer descriptor as well after
every "init" we have to reset "{tx|rx}_currdescnum".

[Original U-Boot patch by Alexey Brodkin <abrodkin@synopsys.com>]

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Ian Abbott 2016-11-07 18:16:24 +00:00 committed by Sascha Hauer
parent 184ef5a1ff
commit c1c0203b68
1 changed files with 2 additions and 0 deletions
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2
drivers/net/designware.c
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@ -176,6 +176,7 @@ static void tx_descs_init(struct eth_device *dev)
desc_p->dmamac_next = &desc_table_p[0];
writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
priv->tx_currdescnum = 0;
}
static void rx_descs_init(struct eth_device *dev)
@ -207,6 +208,7 @@ static void rx_descs_init(struct eth_device *dev)
desc_p->dmamac_next = &desc_table_p[0];
writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
priv->rx_currdescnum = 0;
}
static void descs_init(struct eth_device *dev)