Re: [PATCH v2 4/6] phy: meson-g12a-usb3-pcie: Add support for PCIe mode

Andrew Murray
2019-09-16T13:23:23Z

On Mon, Sep 16, 2019 at 02:50:20PM +0200, Neil Armstrong wrote:
> This adds extended PCIe PHY functions for the Amlogic G12A
> USB3+PCIE Combo PHY to support reset, power_on and power_off for
> PCIe exclusively.
>
> With these callbacks, we can handle all the needed operations of the
> Amlogic PCIe controller driver.
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
> .../phy/amlogic/phy-meson-g12a-usb3-pcie.c | 70 ++++++++++++++++---
> 1 file changed, 61 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/phy/amlogic/phy-meson-g12a-usb3-pcie.c b/drivers/phy/amlogic/phy-meson-g12a-usb3-pcie.c
> index ac322d643c7a..08e322789e59 100644
> --- a/drivers/phy/amlogic/phy-meson-g12a-usb3-pcie.c
> +++ b/drivers/phy/amlogic/phy-meson-g12a-usb3-pcie.c
> @@ -50,6 +50,8 @@
> #define PHY_R5_PHY_CR_ACK BIT(16)
> #define PHY_R5_PHY_BS_OUT BIT(17)
>
> +#define PCIE_RESET_DELAY 500
> +
> struct phy_g12a_usb3_pcie_priv {
> struct regmap *regmap;
> struct regmap *regmap_cr;
> @@ -196,6 +198,10 @@ static int phy_g12a_usb3_init(struct phy *phy)
> struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> int data, ret;
>
> + ret = reset_control_reset(priv->reset);
> + if (ret)
> + return ret;

Reviewed-by: Andrew Murray <andrew.murray@arm.com>

> +
> /* Switch PHY to USB3 */
> /* TODO figure out how to handle when PCIe was set in the bootloader */
> regmap_update_bits(priv->regmap, PHY_R0,
> @@ -272,24 +278,64 @@ static int phy_g12a_usb3_init(struct phy *phy)
> return 0;
> }
>
> -static int phy_g12a_usb3_pcie_init(struct phy *phy)
> +static int phy_g12a_usb3_pcie_power_on(struct phy *phy)
> +{
> + struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> +
> + if (priv->mode == PHY_TYPE_USB3)
> + return 0;
> +
> + regmap_update_bits(priv->regmap, PHY_R0,
> + PHY_R0_PCIE_POWER_STATE,
> + FIELD_PREP(PHY_R0_PCIE_POWER_STATE, 0x1c));
> +
> + return 0;
> +}
> +
> +static int phy_g12a_usb3_pcie_power_off(struct phy *phy)
> +{
> + struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> +
> + if (priv->mode == PHY_TYPE_USB3)
> + return 0;
> +
> + regmap_update_bits(priv->regmap, PHY_R0,
> + PHY_R0_PCIE_POWER_STATE,
> + FIELD_PREP(PHY_R0_PCIE_POWER_STATE, 0x1d));
> +
> + return 0;
> +}
> +
> +static int phy_g12a_usb3_pcie_reset(struct phy *phy)
> {
> struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> int ret;
>
> - ret = reset_control_reset(priv->reset);
> + if (priv->mode == PHY_TYPE_USB3)
> + return 0;
> +
> + ret = reset_control_assert(priv->reset);
> if (ret)
> return ret;
>
> + udelay(PCIE_RESET_DELAY);
> +
> + ret = reset_control_deassert(priv->reset);
> + if (ret)
> + return ret;
> +
> + udelay(PCIE_RESET_DELAY);
> +
> + return 0;
> +}
> +
> +static int phy_g12a_usb3_pcie_init(struct phy *phy)
> +{
> + struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
> +
> if (priv->mode == PHY_TYPE_USB3)
> return phy_g12a_usb3_init(phy);
>
> - /* Power UP PCIE */
> - /* TODO figure out when the bootloader has set USB3 mode before */
> - regmap_update_bits(priv->regmap, PHY_R0,
> - PHY_R0_PCIE_POWER_STATE,
> - FIELD_PREP(PHY_R0_PCIE_POWER_STATE, 0x1c));
> -
> return 0;
> }
>
> @@ -297,7 +343,10 @@ static int phy_g12a_usb3_pcie_exit(struct phy *phy)
> {
> struct phy_g12a_usb3_pcie_priv *priv = phy_get_drvdata(phy);
>
> - return reset_control_reset(priv->reset);
> + if (priv->mode == PHY_TYPE_USB3)
> + return reset_control_reset(priv->reset);
> +
> + return 0;
> }
>
> static struct phy *phy_g12a_usb3_pcie_xlate(struct device *dev,
> @@ -326,6 +375,9 @@ static struct phy *phy_g12a_usb3_pcie_xlate(struct device *dev,
> static const struct phy_ops phy_g12a_usb3_pcie_ops = {
> .init = phy_g12a_usb3_pcie_init,
> .exit = phy_g12a_usb3_pcie_exit,
> + .power_on = phy_g12a_usb3_pcie_power_on,
> + .power_off = phy_g12a_usb3_pcie_power_off,
> + .reset = phy_g12a_usb3_pcie_reset,
> .owner = THIS_MODULE,
> };
>
> --
> 2.22.0
>