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Date: Tue, 12 Feb 2019 17:01:14 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Peter Ujfalusi <peter.ujfalusi@...com>
Cc: David S Miller <davem@...emloft.net>,
Roger Quadros <rogerq@...com>, netdev@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
Niklas Cassel <niklas.cassel@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
"Nori, Sekhar" <nsekhar@...com>
Subject: Re: [v3,4/5] net: phy: at803x: Disable phy delay for RGMII mode
Hi Peter,
On 12-02-19, 12:55, Peter Ujfalusi wrote:
> Vinod,
>
> On 21/01/2019 11.13, Vinod Koul wrote:
> > For RGMII mode, phy delay should be disabled. Add this case along
> > with disable delay routines.
>
> In next-20190211 I need to revert this patch to get cpsw networking to
> work on am335x-evmsk. The board uses AR8031_AL1A PHY, which is handled
> by the phy/at803x.c
I see that DTS specifies that you are using phy-mode = "rgmii-txid".
RGMII mode implies that we should not have any delay in the
phy, so this patch does the right thing.
In the previous version of the patch I did propose to add a DT entry so
that current users who are wrongly using this would not be impacted but
the suggestion was to get them fixed.
So in you case do you need rgmii-txd mode if so why should the delay be
enabled for this? We can add a patch that enabled delay for your
controller but that cant be rgmii mode.
Thanks
>
> On next-20190211:
> [ 3.374601] net eth0: initializing cpsw version 1.12 (0)
> [ 3.384484] Atheros 8031 ethernet 4a101000.mdio:00: attached PHY driver [Atheros 8031 ethernet] (mii_bus:phy_addr=4a101000.mdio:00, irq=POLL)
> [ 3.400041] cpsw 4a100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> [ 3.410813] mmc1: new SDIO card at address 0001
> [ 3.439362] IP-Config: Complete:
> [ 3.442649] device=eth0, hwaddr=bc:6a:29:7d:2c:a9, ipaddr=10.0.0.90, mask=255.255.255.0, gw=10.0.0.1
> [ 3.452840] host=10.0.0.90, domain=, nis-domain=(none)
> [ 3.458462] bootserver=10.0.0.30, rootserver=10.0.0.30, rootpath=
> [ 3.466296] vwl1271: disabling
> [ 3.470195] ALSA device list:
> [ 3.473189] #0: AM335x-EVMSK
>
> After reverting this patch:
> [ 3.374636] net eth0: initializing cpsw version 1.12 (0)
> [ 3.384534] Atheros 8031 ethernet 4a101000.mdio:00: attached PHY driver [Atheros 8031 ethernet] (mii_bus:phy_addr=4a101000.mdio:00, irq=POLL)
> [ 3.400125] cpsw 4a100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> [ 3.410866] mmc1: new SDIO card at address 0001
> [ 3.439379] IP-Config: Complete:
> [ 3.442666] device=eth0, hwaddr=bc:6a:29:7d:2c:a9, ipaddr=10.0.0.90, mask=255.255.255.0, gw=10.0.0.1
> [ 3.452865] host=10.0.0.90, domain=, nis-domain=(none)
> [ 3.458482] bootserver=10.0.0.30, rootserver=10.0.0.30, rootpath=
> [ 3.466334] vwl1271: disabling
> [ 3.470245] ALSA device list:
> [ 3.473241] #0: AM335x-EVMSK
> [ 3.501052] VFS: Mounted root (nfs filesystem) readonly on device 0:15.
> [ 3.508694] devtmpfs: mounted
> [ 3.514546] Freeing unused kernel memory: 1024K
> [ 3.520567] Run /sbin/init as init process
>
> and the board boots to nfsroot fine.
>
>
> > Signed-off-by: Vinod Koul <vkoul@...nel.org>
> > ---
> > drivers/net/phy/at803x.c | 22 ++++++++++++----------
> > 1 file changed, 12 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> > index f9432d053a22..8ff12938ab47 100644
> > --- a/drivers/net/phy/at803x.c
> > +++ b/drivers/net/phy/at803x.c
> > @@ -110,16 +110,16 @@ static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg,
> > return phy_write(phydev, AT803X_DEBUG_DATA, val);
> > }
> >
> > -static inline int at803x_enable_rx_delay(struct phy_device *phydev)
> > +static inline int at803x_disable_rx_delay(struct phy_device *phydev)
> > {
> > - return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
> > - AT803X_DEBUG_RX_CLK_DLY_EN);
> > + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
> > + AT803X_DEBUG_RX_CLK_DLY_EN, 0);
> > }
> >
> > -static inline int at803x_enable_tx_delay(struct phy_device *phydev)
> > +static inline int at803x_disable_tx_delay(struct phy_device *phydev)
> > {
> > - return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
> > - AT803X_DEBUG_TX_CLK_DLY_EN);
> > + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5,
> > + AT803X_DEBUG_TX_CLK_DLY_EN, 0);
> > }
> >
> > /* save relevant PHY registers to private copy */
> > @@ -256,15 +256,17 @@ static int at803x_config_init(struct phy_device *phydev)
> > return ret;
> >
> > if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
> > - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
> > - ret = at803x_enable_rx_delay(phydev);
> > + phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> > + phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> > + ret = at803x_disable_rx_delay(phydev);
> > if (ret < 0)
> > return ret;
> > }
> >
> > if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
> > - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
> > - ret = at803x_enable_tx_delay(phydev);
> > + phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> > + phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> > + ret = at803x_disable_tx_delay(phydev);
> > if (ret < 0)
> > return ret;
> > }
> >
>
> - Péter
>
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
--
~Vinod
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