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57 lines
2.1 KiB
57 lines
2.1 KiB
From 623997fb90eab7a135c2c68a332c8450a488baca Mon Sep 17 00:00:00 2001
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From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
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Date: Thu, 16 Jan 2014 10:52:35 +0000
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Subject: [PATCH] net: stmmac: fix power management suspend-resume case
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The driver PM resume assumes that the IP is still powered up and the
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all the register contents are not disturbed when it comes out of low
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power suspend case. This assumption is wrong, basically the driver
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should not consider any state of registers after it comes out of low
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power. However driver can keep the part of the IP powered up if its a
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wake up source. But it can not assume the register state of the IP. Also
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its possible that SOC glue layer can take the power off the IP if its
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not wake-up source to reduce the power consumption.
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This patch re initializes hardware by calling stmmac_hw_setup function in
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resume case.
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
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Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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index 341c8dc3..742a83f 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -2887,18 +2887,19 @@ int stmmac_resume(struct net_device *ndev)
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* this bit because it can generate problems while resuming
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* from another devices (e.g. serial console).
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*/
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- if (device_may_wakeup(priv->device))
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+ if (device_may_wakeup(priv->device)) {
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priv->hw->mac->pmt(priv->ioaddr, 0);
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- else
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+ } else {
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/* enable the clk prevously disabled */
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clk_prepare_enable(priv->stmmac_clk);
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+ /* reset the phy so that it's ready */
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+ if (priv->mii)
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+ stmmac_mdio_reset(priv->mii);
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+ }
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netif_device_attach(ndev);
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- /* Enable the MAC and DMA */
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- stmmac_set_mac(priv->ioaddr, true);
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- priv->hw->dma->start_tx(priv->ioaddr);
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- priv->hw->dma->start_rx(priv->ioaddr);
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+ stmmac_hw_setup(ndev);
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napi_enable(&priv->napi);
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--
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1.8.5.5
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