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Date: Tue, 18 Feb 2014 09:19:23 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Hayes Wang <hayeswang@...ltek.com>
Cc: netdev <netdev@...r.kernel.org>, nic_swsd@...ltek.com,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-usb <linux-usb@...r.kernel.org>
Subject: Re: [PATCH net-next 07/14] r8152: combine PHY reset with set_speed
Hi Hayes,
2014-02-18 5:49 GMT-08:00 Hayes Wang <hayeswang@...ltek.com>:
> PHY reset is necessary after some hw settings. However, it would
> cause the linking down, and so does the set_speed function. Combine
> the PHY reset with set_speed function. That could reduce the frequency
> of linking down and accessing the PHY register.
>
> Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
> ---
> drivers/net/usb/r8152.c | 57 ++++++++++++++++++++++++++++++++++++++-----------
> 1 file changed, 45 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index c7bae39..b3155da 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -436,6 +436,7 @@ enum rtl8152_flags {
> RTL8152_SET_RX_MODE,
> WORK_ENABLE,
> RTL8152_LINK_CHG,
> + PHY_RESET,
> };
>
> /* Define these values to match your device */
> @@ -1796,6 +1797,29 @@ static void r8152_power_cut_en(struct r8152 *tp, bool enable)
>
> }
>
> +static void rtl_phy_reset(struct r8152 *tp)
> +{
> + u16 data;
> + int i;
> +
> + clear_bit(PHY_RESET, &tp->flags);
> +
> + data = r8152_mdio_read(tp, MII_BMCR);
> +
> + /* don't reset again before the previous one complete */
> + if (data & BMCR_RESET)
> + return;
> +
> + data |= BMCR_RESET;
> + r8152_mdio_write(tp, MII_BMCR, data);
> +
> + for (i = 0; i < 50; i++) {
> + msleep(20);
> + if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
> + break;
> + }
> +}
If you implemented libphy in the driver you would not have to
duplicate that and you could use "phy_init_hw()" or
genphy_soft_reset() to perform the BMCR-based software reset.
> +
> static void rtl_clear_bp(struct r8152 *tp)
> {
> ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_0, 0);
> @@ -1854,6 +1878,7 @@ static void r8152b_hw_phy_cfg(struct r8152 *tp)
> }
>
> r8152b_disable_aldps(tp);
> + set_bit(PHY_RESET, &tp->flags);
> }
>
> static void r8152b_exit_oob(struct r8152 *tp)
> @@ -2042,6 +2067,8 @@ static void r8153_hw_phy_cfg(struct r8152 *tp)
> data = sram_read(tp, SRAM_10M_AMP2);
> data |= AMP_DN;
> sram_write(tp, SRAM_10M_AMP2, data);
> +
> + set_bit(PHY_RESET, &tp->flags);
> }
>
> static void r8153_u1u2en(struct r8152 *tp, bool enable)
> @@ -2295,12 +2322,26 @@ static int rtl8152_set_speed(struct r8152 *tp, u8 autoneg, u16 speed, u8 duplex)
> bmcr = BMCR_ANENABLE | BMCR_ANRESTART;
> }
>
> + if (test_bit(PHY_RESET, &tp->flags))
> + bmcr |= BMCR_RESET;
> +
> if (tp->mii.supports_gmii)
> r8152_mdio_write(tp, MII_CTRL1000, gbcr);
>
> r8152_mdio_write(tp, MII_ADVERTISE, anar);
> r8152_mdio_write(tp, MII_BMCR, bmcr);
>
> + if (test_bit(PHY_RESET, &tp->flags)) {
> + int i;
> +
> + clear_bit(PHY_RESET, &tp->flags);
> + for (i = 0; i < 50; i++) {
> + msleep(20);
> + if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
> + break;
> + }
> + }
> +
> out:
>
> return ret;
> @@ -2364,6 +2405,10 @@ static void rtl_work_func_t(struct work_struct *work)
> if (test_bit(RTL8152_SET_RX_MODE, &tp->flags))
> _rtl8152_set_rx_mode(tp->netdev);
>
> +
> + if (test_bit(PHY_RESET, &tp->flags))
> + rtl_phy_reset(tp);
> +
> out1:
> return;
> }
> @@ -2459,7 +2504,6 @@ static void r8152b_enable_fc(struct r8152 *tp)
> static void r8152b_init(struct r8152 *tp)
> {
> u32 ocp_data;
> - int i;
>
> rtl_clear_bp(tp);
>
> @@ -2491,14 +2535,6 @@ static void r8152b_init(struct r8152 *tp)
> r8152b_enable_aldps(tp);
> r8152b_enable_fc(tp);
>
> - r8152_mdio_write(tp, MII_BMCR, BMCR_RESET | BMCR_ANENABLE |
> - BMCR_ANRESTART);
> - for (i = 0; i < 100; i++) {
> - udelay(100);
> - if (!(r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET))
> - break;
> - }
> -
> /* enable rx aggregation */
> ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_USB_CTRL);
> ocp_data &= ~RX_AGG_DISABLE;
> @@ -2569,9 +2605,6 @@ static void r8153_init(struct r8152 *tp)
> r8153_enable_eee(tp);
> r8153_enable_aldps(tp);
> r8152b_enable_fc(tp);
> -
> - r8152_mdio_write(tp, MII_BMCR, BMCR_RESET | BMCR_ANENABLE |
> - BMCR_ANRESTART);
> }
>
> static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
> --
> 1.8.4.2
>
> --
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--
Florian
--
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