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net: stmmac: dwmac4: Re-enable MAC Rx before powering down 

Re-enable the MAC receiver by setting CONFIG_RE before powering down,
as instructed in section 6.3.5.1 of [1].  Without this the MAC fails
to receive WoL packets and never wakes up.

[1] DWC Ethernet QoS Databook 4.10a October 2014

Signed-off-by: Ed Blake <ed.blake@sondrel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ed Blake 2017-09-26 11:44:53 +01:00 committed by David S. Miller
parent 06d7a1b932
commit 1579f678fb
1 changed files with 7 additions and 0 deletions
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7
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
View File

@ -296,6 +296,7 @@ static void dwmac4_pmt(struct mac_device_info *hw, unsigned long mode)
{
void __iomem *ioaddr = hw->pcsr;
unsigned int pmt = 0;
u32 config;
if (mode & WAKE_MAGIC) {
pr_debug("GMAC: WOL Magic frame\n");
@ -306,6 +307,12 @@ static void dwmac4_pmt(struct mac_device_info *hw, unsigned long mode)
pmt |= power_down | global_unicast | wake_up_frame_en;
}
if (pmt) {
/* The receiver must be enabled for WOL before powering down */
config = readl(ioaddr + GMAC_CONFIG);
config |= GMAC_CONFIG_RE;
writel(config, ioaddr + GMAC_CONFIG);
}
writel(pmt, ioaddr + GMAC_PMT);
}