linux-kernel - Re: [PATCH 5/6] phy: amlogic: meson8b-usb2: unset the IDDQ bit during PHY power-on

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Date:   Mon, 4 May 2020 13:00:10 +0200
From:   hex dump <hexdump0815@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     kishon@...com, robh+dt@...nel.org, vkoul@...nel.org,
        devicetree@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        narmstrong@...libre.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] phy: amlogic: meson8b-usb2: unset the IDDQ bit during
 PHY power-on

On Sat, May 2, 2020 at 1:48 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> The vendor driver unsets the set_iddig bit during power-on as well and
> sets it when suspending the PHY. I did not notice this in the vendor
> driver first, because it's part of the dwc_otg driver there (instead of
> their PHY code). While here, also add all other REG_DBG_UART register
> bit definitions.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Tested-by: hexdump <hexdump0815@...glemail.com>

> ---
>  drivers/phy/amlogic/phy-meson8b-usb2.c | 44 +++++++++++++++++++-------
>  1 file changed, 32 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/phy/amlogic/phy-meson8b-usb2.c b/drivers/phy/amlogic/phy-meson8b-usb2.c
> index 7236b8885f07..436dfa1a8a04 100644
> --- a/drivers/phy/amlogic/phy-meson8b-usb2.c
> +++ b/drivers/phy/amlogic/phy-meson8b-usb2.c
> @@ -78,6 +78,17 @@
>         #define REG_ADP_BC_ACA_PIN_FLOAT                BIT(26)
>
>  #define REG_DBG_UART                                   0x10
> +       #define REG_DBG_UART_BYPASS_SEL                 BIT(0)
> +       #define REG_DBG_UART_BYPASS_DM_EN               BIT(1)
> +       #define REG_DBG_UART_BYPASS_DP_EN               BIT(2)
> +       #define REG_DBG_UART_BYPASS_DM_DATA             BIT(3)
> +       #define REG_DBG_UART_BYPASS_DP_DATA             BIT(4)
> +       #define REG_DBG_UART_FSV_MINUS                  BIT(5)
> +       #define REG_DBG_UART_FSV_PLUS                   BIT(6)
> +       #define REG_DBG_UART_FSV_BURN_IN_TEST           BIT(7)
> +       #define REG_DBG_UART_LOOPBACK_EN_B              BIT(8)
> +       #define REG_DBG_UART_SET_IDDQ                   BIT(9)
> +       #define REG_DBG_UART_ATE_RESET                  BIT(10)
>
>  #define REG_TEST                                       0x14
>         #define REG_TEST_DATA_IN_MASK                   GENMASK(3, 0)
> @@ -172,20 +183,24 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
>         regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
>                            REG_CTRL_SOF_TOGGLE_OUT);
>
> -       if (priv->dr_mode == USB_DR_MODE_HOST &&
> -           priv->match->host_enable_aca) {
> -               regmap_update_bits(priv->regmap, REG_ADP_BC,
> -                                  REG_ADP_BC_ACA_ENABLE,
> -                                  REG_ADP_BC_ACA_ENABLE);
> +       if (priv->dr_mode == USB_DR_MODE_HOST) {
> +               regmap_update_bits(priv->regmap, REG_DBG_UART,
> +                                  REG_DBG_UART_SET_IDDQ, 0);
>
> -               udelay(ACA_ENABLE_COMPLETE_TIME);
> +               if (priv->match->host_enable_aca) {
> +                       regmap_update_bits(priv->regmap, REG_ADP_BC,
> +                                          REG_ADP_BC_ACA_ENABLE,
> +                                          REG_ADP_BC_ACA_ENABLE);
>
> -               regmap_read(priv->regmap, REG_ADP_BC, &reg);
> -               if (reg & REG_ADP_BC_ACA_PIN_FLOAT) {
> -                       dev_warn(&phy->dev, "USB ID detect failed!\n");
> -                       clk_disable_unprepare(priv->clk_usb);
> -                       clk_disable_unprepare(priv->clk_usb_general);
> -                       return -EINVAL;
> +                       udelay(ACA_ENABLE_COMPLETE_TIME);
> +
> +                       regmap_read(priv->regmap, REG_ADP_BC, &reg);
> +                       if (reg & REG_ADP_BC_ACA_PIN_FLOAT) {
> +                               dev_warn(&phy->dev, "USB ID detect failed!\n");
> +                               clk_disable_unprepare(priv->clk_usb);
> +                               clk_disable_unprepare(priv->clk_usb_general);
> +                               return -EINVAL;
> +                       }
>                 }
>         }
>
> @@ -196,6 +211,11 @@ static int phy_meson8b_usb2_power_off(struct phy *phy)
>  {
>         struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
>
> +       if (priv->dr_mode == USB_DR_MODE_HOST)
> +               regmap_update_bits(priv->regmap, REG_DBG_UART,
> +                                  REG_DBG_UART_SET_IDDQ,
> +                                  REG_DBG_UART_SET_IDDQ);
> +
>         clk_disable_unprepare(priv->clk_usb);
>         clk_disable_unprepare(priv->clk_usb_general);
>
> --
> 2.26.2
>