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net: bcmgenet: test MPD_EN when resuming 

When the GENET driver resumes from deep sleep the UMAC_CMD
register may not be accessible and therefore should not be
accessed from bcmgenet_wol_power_up_cfg() if the GENET has
been reset.

This commit adds a check of the MPD_EN flag when Wake on
Magic Packet is enabled. A clear flag indicates that the
GENET hardware must have been reset so the remainder of the
hardware programming is bypassed.

Fixes: 1a1d5106c1 ("net: bcmgenet: move clk_wol management to bcmgenet_wol")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Doug Berger 2020-07-16 16:38:15 -07:00 committed by David S. Miller
parent aba69d49fb
commit 2f11f0df84
1 changed files with 8 additions and 4 deletions
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12
drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
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@ -217,11 +217,16 @@ void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
priv->wol_active = 0;
clk_disable_unprepare(priv->clk_wol);
priv->crc_fwd_en = 0;
/* Disable Magic Packet Detection */
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
reg &= ~(MPD_EN | MPD_PW_EN);
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
if (!(reg & MPD_EN))
return; /* already reset so skip the rest */
reg &= ~(MPD_EN | MPD_PW_EN);
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
}
/* Disable WAKE_FILTER Detection */
reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
@ -232,5 +237,4 @@ void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
reg = bcmgenet_umac_readl(priv, UMAC_CMD);
reg &= ~CMD_CRC_FWD;
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
priv->crc_fwd_en = 0;
}