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SubjectRE: [PATCH net-next 1/3] net: stmmac: add gmac autoneg set for SGMII, TBI, and RTBI
Date
Hello Peppe,
> Hello Byungho
>
> sorry for my late reply. I'm attaching two patches built for net-next
> as we had clarified. I had written the first patch long time ago
> and on top of it I have added some part of your code below with some
> fixes (see also the comments inline below).
>
> This work is not yet completed but I do hope these two patches will
> help you to complete all. Unfortunately, I cannot do any tests
> because I have no HW that supports PCS. :-(
>
> In the second patch, take a look at the comment that reports
> the missing parts. For example, ethtool, SGMII etc.
>
> I wonder if you could review/test the two patches on your side.

Looks good to me and it works fine on my hardware platform. Just note, I
tested them with some additional stuff which is in stmmac_init_phy() and
stmmac_mdio_register() for SGMII.

> Also I hope you can improve all adding the missing features (that is
> what you were already doing).
>
> If you agree, you could also re-send *all* to the mailing list to
> be finally reviewed.
>

Anyway, in my opinion, you can take them in your tree for now with my
tested-by if you want. Of course, I'll implement additional patches as you
requested on top of them for remained stuff such as SGMII, TBI, ethtool and
so on.
I think those should be separated for each purpose and we can add and modify
after those two patches.

On 2/22/2013 10:418 PM, Giuseppe CAVALLARO wrote:
> On 1/25/2013 11:01 PM, Byungho An wrote:
> >
> > On 1/23/2013 1:43 PM, Giuseppe CAVALLARO write:
>
> [snip]
>
> >>
> > I modified this part like below
> >
> > @@ -1044,12 +1046,8 @@ static int stmmac_open(struct net_device *dev)
> > priv->hw->mac->core_init(priv->ioaddr);
> >
> > /* Enable auto-negotiation for SGMII, TBI or RTBI */
> > - if (interface == PHY_INTERFACE_MODE_SGMII ||
> > - interface == PHY_INTERFACE_MODE_TBI ||
> > - interface == PHY_INTERFACE_MODE_RTBI) {
> > - if (priv->phydev->autoneg)
> > - priv->hw->mac->set_autoneg(priv->ioaddr);
> > - }
> > + if (priv->dma_cap.pcs)
> > + priv->hw->mac->ctrl_ane(priv->ioaddr, 0);
> >
> > /* Request the IRQ lines */
> > ret = request_irq(dev->irq, stmmac_interrupt,
> >
> > As you may know, auto-negotiation is essential for SGMII, TBI, or RTBI
> > interface.
> >
>
> good, add it on top of the second patch.

this part is already in the second patch. I think restart flag should be 0
because auto-negotiation does not restarted in the stmmac_open function.

>
> > And ctrl_ane funciont is like that
> >
> > @@ -311,6 +317,18 @@ static void dwmac1000_set_autoneg(void __iomem
> *ioaddr)
> > writel(value, ioaddr + GMAC_AN_CTRL);
> > }
> >
> > +static void dwmac1000_ctrl_ane(void __iomem *ioaddr, bool restart)
> > +{
> > + u32 value;
> > +
> > + value = readl(ioaddr + GMAC_AN_CTRL);
> > + /* auto negotiation enable and External Loopback enable */
> > + value = GMAC_AN_CTRL__ANE | GMAC_AN_CTRL__ELE;
> > +
> > + if (restart)
> > + value |= GMAC_AN_CTRL_RAN;
> > +
> > + writel(value, ioaddr + GMAC_AN_CTRL);
> > +}
> >
> > static const struct stmmac_ops dwmac1000_ops = {
> > .core_init = dwmac1000_core_init,
>
> well done and added in the second patch.
>
> [snip]
> > I've changed restart AN like below.
> >
> > @@ -610,6 +607,27 @@ static int stmmac_set_coalesce(struct net_device
> *dev,
> > return 0;
> > }
> >
> > +static int
> > +stmmac_nway_reset(struct net_device *netdev)
> > +{
> > + struct stmmac_priv *priv = netdev_priv(netdev);
> > + struct phy_device *phy = priv->phydev;
> > + int ret = 0;
> > +
> > + spin_lock(&priv->lock);
> > +
> > + if (netif_running(netdev)) {
> > + phy_stop(phy);
> > + phy_start(phy);
> > + ret = phy_start_aneg(phy);
> > + if (priv->dma_cap.pcs)
> > + priv->hw->mac->ctrl_ane(priv->ioaddr, true);
> > + }
> > +
> > + spin_unlock(&priv->lock);
> > + return ret;
> > +}
> > +
> > static const struct ethtool_ops stmmac_ethtool_ops = {
> > .begin = stmmac_check_if_running,
> > .get_drvinfo = stmmac_ethtool_getdrvinfo,
> >
> >
>
> we have to review this. I expect to have a new patch that includes the
> ethtool support but, at first glance, the stmmac_nway_reset should only
> call the ctrl_ane.
>
> pay attention that also some other ethtool functions have to be fixed
> for this support.
>

I agree with you, I need more time to test ethtool support including
advertisement support.

> [snip]
>
> > I think whenever link is changed, phy->state is changed and call
> > stmmac_adjust_link. It would update gmac's link.
> > I can get autonegotiation complete and link change irqs if we need
> something
> > we can add code in the handler but I'm not sure which one is need yet.
> > As of now I just added phy_state = PHY_CHANGELINK as a test code in the
> link
> > change irq handler.
> >
> > @@ -1624,8 +1629,43 @@ static irqreturn_t stmmac_interrupt(int irq, void
> > *dev_id)
> >
priv->xstats.mmc_rx_csum_offload_irq_n++;
> > if (status & core_irq_receive_pmt_irq)
> > priv->xstats.irq_receive_pmt_irq_n++;
> > + if (status & core_irq_pcs_autoneg_complete)
> > + priv->core_pcs_an = true;
> > + if (status & core_irq_pcs_link_status_change) {
> > + priv->core_pcs_link_change = true;
> > + status = readl(priv->ioaddr +
> > GMAC_AN_STATUS);
> > + if (status & GMAC_AN_STATUS_LS)
> > + if ((priv->speed != phy->speed)
||
> > (priv->oldduplex != phy->duplex))
> > + phy->state = PHY_CHANGELINK; /*
for
> > test */
> > + }
> >
> > /* For LPI we need to save the tx status */
> > if (status & core_irq_tx_path_in_lpi_mode) {
> >
> > I have a question, how to hand over phy's irq number, as I analyzed
> > phydev->irq is irqlist and irqlist is like below but I can not find a
> way to
> > set phy's irq number.
> > How to register or set priv->mii_irq or mdio_bus_data->irqs.
> >
> > if (mdio_bus_data->irqs)
> > irqlist = mdio_bus_data->irqs;
> > else
> > irqlist = priv->mii_irq;
>
> I had added something in my first patch that should be ok.
>
> > I added some defines for AN like below
> > @@ -97,6 +97,20 @@ enum power_event {
> > #define GMAC_TBI 0x000000d4 /* TBI extend status */
> > #define GMAC_GMII_STATUS 0x000000d8 /* S/R-GMII status */
> >
> > +/* AN Configuration defines */
> > +#define GMAC_AN_CTRL_RAN 0x00000200 /* Restart
Auto-Negotiation
> > */
> > +#define GMAC_AN_CTRL_ANE 0x00001000 /* Auto-Negotiation
Enable
> > */
> > +#define GMAC_AN_CTRL_ELE 0x00004000 /* External Loopback
Enable
> > */
> > +#define GMAC_AN_CTRL_ECD 0x00010000 /* Enable Comma Detect
*/
> > +#define GMAC_AN_CTRL_LR 0x00020000 /* Lock to Reference */
> > +#define GMAC_AN_CTRL_SGMRAL 0x00040000 /* SGMII RAL Control */
> > +
> > +/* AN Status defines */
> > +#define GMAC_AN_STATUS_LS 0x00000004 /* Link Status 0:down
1:up
> > */
> > +#define GMAC_AN_STATUS_ANA 0x00000008 /* Auto-Negotiation
> Ability
> > */
> > +#define GMAC_AN_STATUS_ANC 0x00000020 /* Auto-Negotiation
> Complete
> > */
> > +#define GMAC_AN_STATUS_ES 0x00000100 /* Extended Status */
> > +
> > /* GMAC Configuration defines */
> > #define GMAC_CONTROL_TC 0x01000000 /* Transmit Conf. in
> > RGMII/SGMII */
> > #define GMAC_CONTROL_WD 0x00800000 /* Disable Watchdog on
> > receive */
>
> ok, these are in the second patch



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