From: Marc Gonzalez <marc.w.gonzalez@free.fr>
To: Vinod Koul <vkoul@kernel.org>,
David S Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>
Cc: MSM <linux-arm-msm@vger.kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Niklas Cassel <niklas.cassel@linaro.org>,
Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Nori Sekhar <nsekhar@ti.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>
Subject: Re: [PATCH net-next v3 2/2] net: phy: at803x: disable delay only for RGMII mode
Date: Tue, 19 Feb 2019 12:57:18 +0100 [thread overview]
Message-ID: <1dddc455-309d-5e7d-ca26-479fe800a013@free.fr> (raw)
In-Reply-To: <20190219061800.31025-3-vkoul@kernel.org>
On 19/02/2019 07:18, Vinod Koul wrote:
> Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode
> should not have delay in PHY whereas RGMII_ID and RGMII_RXID/RGMII_TXID
> can have delay in phy.
PHY or phy? :-)
> So disable the delay only for RGMII mode and enable for other modes.
> Also treat the default case as disabled delays.
>
> Fixes: cd28d1d6e52e: ("net: phy: at803x: Disable phy delay for RGMII mode")
> Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> Reviewed-by: Niklas Cassel <niklas.cassel@linaro.org>
> Tested-by: Peter Ujfalusi <peter.ujflausi@ti.com>
> Signed-off-by: Vinod Koul <vkoul@kernel.org>
> ---
> drivers/net/phy/at803x.c | 47 ++++++++++++++++++++++++++++++----------
> 1 file changed, 36 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index c6e7d800fd7a..dc1b13f7fc12 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -110,6 +110,18 @@ static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg,
> return phy_write(phydev, AT803X_DEBUG_DATA, val);
> }
>
> +static int at803x_enable_rx_delay(struct phy_device *phydev)
> +{
> + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
> + AT803X_DEBUG_RX_CLK_DLY_EN);
> +}
> +
> +static int at803x_enable_tx_delay(struct phy_device *phydev)
> +{
> + return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
> + AT803X_DEBUG_TX_CLK_DLY_EN);
> +}
> +
> static int at803x_disable_rx_delay(struct phy_device *phydev)
> {
> return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
> @@ -255,23 +267,36 @@ static int at803x_config_init(struct phy_device *phydev)
> if (ret < 0)
> return ret;
>
> - if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
> - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> - phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> - ret = at803x_disable_rx_delay(phydev);
> + /* The hardware register default is RX and TX delay enabled, so lets
> + * first disable the RX and TX delays in phy and enable them based
> + * on the mode selected
> + */
"let's" (let us)
For the record, AFAIR, the default is not *quite* RX and TX enabled:
https://www.spinics.net/lists/netdev/msg444527.html
RX: enabled at HW reset
TX: disabled at HW reset, but retains value after SW reset
> + ret = at803x_disable_rx_delay(phydev);
> + if (ret < 0)
> + return ret;
> + ret = at803x_disable_tx_delay(phydev);
> + if (ret < 0)
> + return ret;
> +
> + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> + phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
> + /* If RGMII_ID or RGMII_RXID are specified enable RX delay,
> + * otherwise keep it disabled
> + */
> + ret = at803x_enable_rx_delay(phydev);
> if (ret < 0)
> return ret;
> }
>
> - if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
> - phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> - phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> - ret = at803x_disable_tx_delay(phydev);
> - if (ret < 0)
> - return ret;
> + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> + phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
> + /* If RGMII_ID or RGMII_TXID are specified enable TX delay,
> + * otherwise keep it disabled
> + */
> + ret = at803x_enable_tx_delay(phydev);
> }
>
> - return 0;
> + return ret;
> }
IMO, the asymmetry in error handling for RX and TX is unfortunate.
Didn't you like the way it was done in my old patch? :-)
https://www.spinics.net/lists/netdev/msg445053.html
Regards.
next prev parent reply other threads:[~2019-02-19 11:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-19 6:17 [PATCH net-next v3 0/2] net: phy: at803x: Update delays for RGMII modes Vinod Koul
2019-02-19 6:17 ` [PATCH net-next v3 1/2] net: phy: at803x: don't inline helpers Vinod Koul
2019-02-19 11:44 ` Marc Gonzalez
2019-02-19 6:18 ` [PATCH net-next v3 2/2] net: phy: at803x: disable delay only for RGMII mode Vinod Koul
2019-02-19 11:57 ` Marc Gonzalez [this message]
2019-02-19 12:33 ` Niklas Cassel
2019-02-19 12:41 ` Marc Gonzalez
2019-02-19 8:09 ` [PATCH net-next v3 0/2] net: phy: at803x: Update delays for RGMII modes Peter Ujfalusi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1dddc455-309d-5e7d-ca26-479fe800a013@free.fr \
--to=marc.w.gonzalez@free.fr \
--cc=andrew@lunn.ch \
--cc=bjorn.andersson@linaro.org \
--cc=davem@davemloft.net \
--cc=f.fainelli@gmail.com \
--cc=linux-arm-msm@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=niklas.cassel@linaro.org \
--cc=nsekhar@ti.com \
--cc=peter.ujfalusi@ti.com \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).