Author: Vishwas Srivastava vishu.kernel@gmail.com Date: Mon Jan 25 21:28:17 2016 +0530
Wrong Initialization in davinci emac driver
emac module of the davinci platform supports only 8 tx and 8 rx channels (total 16). emac driver for davinci platform, however, while doing initialization of the dma descriptor head pointers,wrongly initializes the 16 head pointers (instead of 8) for tx dma and 16 head pointers for rx dma, which is wrong.The result is, that this register initilization spills over the other registers which was not intended and is undesirable.This patch fixes this problem.
Signed-off-by: Vishwas Srivastava vishu.kernel@gmail.com CC: Sergey Kubushyn ksi@koi8.net;Joe Hershberger < joe.hershberger@ni.com> Signed-off-by: Vishwas Srivastava vishu.kernel@gmail.com
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c index 92c3dca..3f54a3f 100644 --- a/drivers/net/davinci_emac.c +++ b/drivers/net/davinci_emac.c @@ -459,11 +459,11 @@ static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
/* Set DMA 8 TX / 8 RX Head pointers to 0 */ addr = &adap_emac->TX0HDP; - for(cnt = 0; cnt < 16; cnt++) + for(cnt = 0; cnt < 8; cnt++) writel(0, addr++);
addr = &adap_emac->RX0HDP; - for(cnt = 0; cnt < 16; cnt++) + for(cnt = 0; cnt < 8; cnt++) writel(0, addr++);
/* Clear Statistics (do this before setting MacControl register) */