From: Dinh Nguyen Date: Fri, 8 Jun 2012 05:26:52 +0000 (+0000) Subject: net/designware: Consecutive writes to the same register to be avoided X-Git-Tag: v2012.10-rc1~415^2~35^2~9^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66f119e50cc854695a3709c67bf6a6c8ef60f6bc;p=kernel%2Fu-boot.git net/designware: Consecutive writes to the same register to be avoided 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. Signed-off-by: Dinh Nguyen Reviewed-by: Matthew Gerlach Acked-by: Amit Virdi --- diff --git a/drivers/net/designware.c b/drivers/net/designware.c index 326d550..bf21a08 100644 --- a/drivers/net/designware.c +++ b/drivers/net/designware.c @@ -171,8 +171,8 @@ 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;