On Wed, Jan 12, 2022 at 05:33:44PM +0800, Mohammad Athari Bin Ismail wrote:
> +static int marvell_loopback(struct phy_device *phydev, bool enable)
> +{
> + if (enable) {
> + u16 bmcr_ctl = 0, mscr2_ctl = 0;
> +
> + if (phydev->speed == SPEED_1000)
> + bmcr_ctl = BMCR_SPEED1000;
> + else if (phydev->speed == SPEED_100)
> + bmcr_ctl = BMCR_SPEED100;
> +
> + if (phydev->duplex == DUPLEX_FULL)
> + bmcr_ctl |= BMCR_FULLDPLX;
> +
> + phy_modify(phydev, MII_BMCR, ~0, bmcr_ctl);
Is there any point in doing a read-modify-write here if you're just
setting all bits in the register? Wouldn't phy_write() be more
appropriate? What about error handing?
> +
> + if (phydev->speed == SPEED_1000)
> + mscr2_ctl = BMCR_SPEED1000;
> + else if (phydev->speed == SPEED_100)
> + mscr2_ctl = BMCR_SPEED100;
> +
> + phy_modify_paged(phydev, MII_MARVELL_MSCR_PAGE,
> + MII_88E1510_MSCR_2, BMCR_SPEED1000 |
> + BMCR_SPEED100, mscr2_ctl);
> +
> + /* Need soft reset to have speed configuration takes effect */
> + genphy_soft_reset(phydev);
> +
> + /* FIXME: Based on trial and error test, it seem 1G need to have
> + * delay between soft reset and loopback enablement.
> + */
> + if (phydev->speed == SPEED_1000)
> + msleep(1000);
> +
> + return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
> + BMCR_LOOPBACK);
> + } else {
> + phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0);
Error handling?
Thanks.
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