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net: bcmgenet: test RBUF_ACPI_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 RBUF_ACPI_EN flag when Wake
on Filter is enabled. A clear flag indicates that the GENET
hardware must have been reset so the remainder of the
hardware programming is bypassed.

Fixes: f50932cca6 ("net: bcmgenet: add WAKE_FILTER support")
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 16:38:16 -07:00 committed by David S. Miller
parent 2f11f0df84
commit 3d653adb4b
1 changed files with 7 additions and 3 deletions
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10
drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
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@ -229,9 +229,13 @@ void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
}
/* Disable WAKE_FILTER Detection */
reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
reg &= ~(RBUF_HFB_EN | RBUF_ACPI_EN);
bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
if (priv->wolopts & WAKE_FILTER) {
reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
if (!(reg & RBUF_ACPI_EN))
return; /* already reset so skip the rest */
reg &= ~(RBUF_HFB_EN | RBUF_ACPI_EN);
bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
}
/* Disable CRC Forward */
reg = bcmgenet_umac_readl(priv, UMAC_CMD);