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ag71xx: Fix rx ring buffer stall on small packets flood on qca956x and qca953x.

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Backported from Code Aurora QSDK

Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net>
This commit is contained in:
Vittorio Gambaletta
2017-03-25 18:08:02 +01:00
committed by Matthias Schiffer
parent 8170f280c4
commit d40a358136
3 changed files with 22 additions and 1 deletions
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16
target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
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@@ -629,6 +629,22 @@ __ag71xx_link_adjust(struct ag71xx *ag, bool update)
ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
if (pdata->disable_inline_checksum_engine) {
/*
* The rx ring buffer can stall on small packets on QCA953x and
* QCA956x. Disabling the inline checksum engine fixes the stall.
* The wr, rr functions cannot be used since this hidden register
* is outside of the normal ag71xx register block.
*/
void __iomem *dam = ioremap_nocache(0xb90001bc, 0x4);
if (dam) {
__raw_writel(__raw_readl(dam) & ~BIT(27), dam);
(void)__raw_readl(dam);
iounmap(dam);
}
}
ag71xx_hw_start(ag);
netif_carrier_on(ag->dev);