This commit is an add-on to f6c4191f. There are a few registers where consecutive writes to the same location should be avoided or have a delay.
According to Synopsys, here is a list of the registers and bit(s) where consecutive writes should be avoided or a delay is required:
DMA Registers: Register 0 Bit 7 Register 6 All bits except for 24, 16-13, 2-1.
GMAC Registers: Registers 0-3 All bits Registers 6-7 All bits Register 10 All bits Register 11 All bits except for 5-6. Registers 16-47 All bits Register 48 All bits except for 18-16, 14. Register 448 Bit 4. Register 459 Bits 0-3.
Reviewd-by: Matthew Gerlach mgerlach@altera.com Signed-off-by: Dinh Nguyen dinguyen@altera.com --- drivers/net/designware.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/designware.c b/drivers/net/designware.c index e8e669b..980b92f 100644 --- a/drivers/net/designware.c +++ b/drivers/net/designware.c @@ -163,8 +163,8 @@ static int dw_eth_init(struct eth_device *dev, bd_t *bis) writel(FIXEDBURST | PRIORXTX_41 | BURST_16, &dma_p->busmode);
- writel(FLUSHTXFIFO | readl(&dma_p->opmode), &dma_p->opmode); - writel(STOREFORWARD | TXSECONDFRAME, &dma_p->opmode); + writel(readl(&dma_p->opmode) | FLUSHTXFIFO | STOREFORWARD | + TXSECONDFRAME, &dma_p->opmode);
conf = FRAMEBURSTENABLE | DISABLERXOWN;