Re: [PATCH net-next v2 1/6] net: phy: mscc: migrate to phy_select/restore_page functions

From: Andrew Lunn
Date: Thu Oct 04 2018 - 11:16:39 EST


On Thu, Oct 04, 2018 at 02:47:23PM +0200, Quentin Schulz wrote:
> @@ -197,25 +199,30 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
> if (rc != 0)
> return rc;
>
> - rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
> - if (rc != 0)
> - return rc;
> + oldpage = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
> + if (oldpage < 0) {
> + rc = oldpage;
> + goto out;
> + }
>
> - reg_val = phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
> + reg_val = __phy_read(phydev, MSCC_PHY_EXT_MODE_CNTL);
> reg_val &= ~(FORCE_MDI_CROSSOVER_MASK);
> if (mdix == ETH_TP_MDI)
> reg_val |= FORCE_MDI_CROSSOVER_MDI;
> else if (mdix == ETH_TP_MDI_X)
> reg_val |= FORCE_MDI_CROSSOVER_MDIX;

Hi Quentin

Could you use phy_modify_paged() here? This function only accesses a
single register, so using the wrapper should not have any
disadvantages. The same should apply for any function modifying a single
register.

> - rc = phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
> + rc = __phy_write(phydev, MSCC_PHY_EXT_MODE_CNTL, reg_val);
> if (rc != 0)
> - return rc;
> + goto out;
>
> - rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD);
> - if (rc != 0)
> + rc = phy_restore_page(phydev, oldpage, rc);
> + if (rc < 0)
> return rc;
>
> return genphy_restart_aneg(phydev);
> +
> +out:
> + return phy_restore_page(phydev, oldpage, rc);
> }
>
> static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
> @@ -223,25 +230,24 @@ static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
> int rc;
> u16 reg_val;
>
> - rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED);
> - if (rc != 0)
> + rc = phy_select_page(phydev, MSCC_PHY_PAGE_EXTENDED);
> + if (rc < 0)
> goto out;
>
> - reg_val = phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
> + reg_val = __phy_read(phydev, MSCC_PHY_ACTIPHY_CNTL);
> reg_val &= DOWNSHIFT_CNTL_MASK;
> if (!(reg_val & DOWNSHIFT_EN))
> *count = DOWNSHIFT_DEV_DISABLE;
> else
> *count = ((reg_val & ~DOWNSHIFT_EN) >> DOWNSHIFT_CNTL_POS) + 2;

phy_read_paged()? Any function which just accesses a single register
should try to use phy_read_paged(), phy_write_paged() or
phy_modify_paged() to avoid a lot of boilerplate code.

Andrew