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| author | Albert Aribaud <albert.aribaud@free.fr> | 2010-07-10 15:41:29 +0200 |
|---|---|---|
| committer | Ben Warren <biggerbadderben@gmail.com> | 2010-07-12 00:02:12 -0700 |
| commit | c19a20d5bd3c2196fb1562a329191e2347d5a40a (patch) | |
| tree | 175b2685e8dde444a6e13dc74d3399906d8394f4 | |
| parent | ca08054e80c64402f6a767a6a188dcfc096eb3b9 (diff) | |
| download | u-boot-imx-c19a20d5bd3c2196fb1562a329191e2347d5a40a.zip u-boot-imx-c19a20d5bd3c2196fb1562a329191e2347d5a40a.tar.gz u-boot-imx-c19a20d5bd3c2196fb1562a329191e2347d5a40a.tar.bz2 | |
kirkwood_egiga: bugfix: add DMA sequence points
Insert isb() sequence points to ensure DMA descriptors
are filled in and set up before actual DMA occurs.
Signed-off-by: Albert Aribaud <albert.aribaud@free.fr>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
| -rw-r--r-- | drivers/net/kirkwood_egiga.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/kirkwood_egiga.c b/drivers/net/kirkwood_egiga.c index 932792e..ea0c522 100644 --- a/drivers/net/kirkwood_egiga.c +++ b/drivers/net/kirkwood_egiga.c @@ -447,6 +447,8 @@ static int kwgbe_init(struct eth_device *dev) /* Assignment of Rx CRDB of given RXUQ */ KWGBEREG_WR(regs->rxcdp[RXUQ], (u32) dkwgbe->p_rxdesc_curr); + /* ensure previous write is done before enabling Rx DMA */ + isb(); /* Enable port Rx. */ KWGBEREG_WR(regs->rqc, (1 << RXUQ)); @@ -536,8 +538,13 @@ static int kwgbe_send(struct eth_device *dev, volatile void *dataptr, p_txdesc->buf_ptr = (u8 *) p; p_txdesc->byte_cnt = datasize; - /* Apply send command using zeroth TXUQ */ + /* Set this tc desc as zeroth TXUQ */ KWGBEREG_WR(regs->tcqdp[TXUQ], (u32) p_txdesc); + + /* ensure tx desc writes above are performed before we start Tx DMA */ + isb(); + + /* Apply send command using zeroth TXUQ */ KWGBEREG_WR(regs->tqc, (1 << TXUQ)); /* |