Messages in this thread Patch in this message | | | Subject | Re: [PATCH] net: fec: fix enet_out clock handling | From | Michael Heimpold <> | Date | Fri, 27 Nov 2015 16:16:49 +0100 |
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Hi,
Am 27.11.2015 um 14:39 schrieb Lothar Waßmann: > When ENET_OUT is being used as reference clock for an external PHY, > the clock must not be disabled while the PHY is active. Otherwise the > PHY may lose its internal state and require a reset to become > functional again. > > A symptom for this bug is a network interface that constantly toggles > between UP and DOWN state: > fec 800f0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx > fec 800f0000.ethernet eth0: Link is Down > fec 800f0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx > fec 800f0000.ethernet eth0: Link is Down > [...]
I would add a sentence about the solution, e.g. moving ENET_OUT handling to driver probe etc.
> Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> > --- > drivers/net/ethernet/freescale/fec_main.c | 34 +++++++++++++------------------ > 1 file changed, 14 insertions(+), 20 deletions(-) > > diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c > index d2328fc..d9df4c5 100644 > --- a/drivers/net/ethernet/freescale/fec_main.c > +++ b/drivers/net/ethernet/freescale/fec_main.c > @@ -1857,11 +1857,6 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable) > ret = clk_prepare_enable(fep->clk_ahb); > if (ret) > return ret; > - if (fep->clk_enet_out) { > - ret = clk_prepare_enable(fep->clk_enet_out); > - if (ret) > - goto failed_clk_enet_out; > - } > if (fep->clk_ptp) { > mutex_lock(&fep->ptp_clk_mutex); > ret = clk_prepare_enable(fep->clk_ptp); > @@ -1873,35 +1868,26 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable) > } > mutex_unlock(&fep->ptp_clk_mutex); > } > - if (fep->clk_ref) { > - ret = clk_prepare_enable(fep->clk_ref); > - if (ret) > - goto failed_clk_ref; > - } > + ret = clk_prepare_enable(fep->clk_ref); > + if (ret) > + goto failed_clk_ref;
This change seems unrelated to the problem. At least, I can leave this part out and the toggle still disappear after apply the remaining parts. However, I've only my Duckbill (iMX28) around to test with.
> } else { > clk_disable_unprepare(fep->clk_ahb); > - if (fep->clk_enet_out) > - clk_disable_unprepare(fep->clk_enet_out); > if (fep->clk_ptp) { > mutex_lock(&fep->ptp_clk_mutex); > clk_disable_unprepare(fep->clk_ptp); > fep->ptp_clk_on = false; > mutex_unlock(&fep->ptp_clk_mutex); > } > - if (fep->clk_ref) > - clk_disable_unprepare(fep->clk_ref); > + clk_disable_unprepare(fep->clk_ref);
Same as above, might be unrelated.
> } > > return 0; > > failed_clk_ref: > - if (fep->clk_ref) > - clk_disable_unprepare(fep->clk_ref); > + clk_disable_unprepare(fep->clk_ref); dito
> failed_clk_ptp: > - if (fep->clk_enet_out) > - clk_disable_unprepare(fep->clk_enet_out); > -failed_clk_enet_out: > - clk_disable_unprepare(fep->clk_ahb); > + clk_disable_unprepare(fep->clk_ahb); > > return ret; > } > @@ -3425,6 +3411,10 @@ fec_probe(struct platform_device *pdev) > if (ret) > goto failed_clk; > > + ret = clk_prepare_enable(fep->clk_enet_out); > + if (ret) > + goto failed_clk_enet_out; > + As enet_out is optional, shouldn't this block be guarded by if (fep->clk_enet_out)... ?
> ret = clk_prepare_enable(fep->clk_ipg); > if (ret) > goto failed_clk_ipg; > @@ -3509,6 +3499,8 @@ failed_init: > if (fep->reg_phy) > regulator_disable(fep->reg_phy); > failed_regulator: > + clk_disable_unprepare(fep->clk_enet_out); here too? > +failed_clk_enet_out: > clk_disable_unprepare(fep->clk_ipg); > failed_clk_ipg: > fec_enet_clk_enable(ndev, false); > @@ -3531,6 +3523,8 @@ fec_drv_remove(struct platform_device *pdev) > fec_ptp_stop(pdev); > unregister_netdev(ndev); > fec_enet_mii_remove(fep); > + fec_enet_clk_enable(ndev, false); > + clk_disable_unprepare(fep->clk_enet_out);
and here too?
> if (fep->reg_phy) > regulator_disable(fep->reg_phy); > of_node_put(fep->phy_node);
Mit freundlichen Grüßen / Kind regards Michael Heimpold -- Software Engineer
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