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Date: Tue, 28 Apr 2020 12:15:15 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: Nagarjuna Kristam <nkristam@...dia.com>
Cc: balbi@...nel.org, gregkh@...uxfoundation.org, jonathanh@...dia.com,
mark.rutland@....com, robh+dt@...nel.org, kishon@...com,
devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 5/8] phy: tegra: xusb: Add soc ops API to enable UTMI
PAD protection
On Wed, Apr 15, 2020 at 01:55:05PM +0530, Nagarjuna Kristam wrote:
> When USB charger is enabled, UTMI PAD needs to be protected according
> to the direction and current level. Add support for the same on Tegra210
> and Tegra186.
>
> Signed-off-by: Nagarjuna Kristam <nkristam@...dia.com>
> ---
> V2:
> - Commit message coorected.
> - Patch re-based.
> ---
> drivers/phy/tegra/xusb-tegra186.c | 40 +++++++++++++++++++++++++++++++++++++++
> drivers/phy/tegra/xusb-tegra210.c | 31 ++++++++++++++++++++++++++++++
> drivers/phy/tegra/xusb.h | 13 +++++++++++++
> 3 files changed, 84 insertions(+)
Oh wait... you're not actually adding custom public APIs for this but
are simply wiring this through the SoC-specific code. Okay, that seems
fine to me.
Ignore my comments on the prior two patches.
> diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
> index f862254..03bdb5b 100644
> --- a/drivers/phy/tegra/xusb-tegra186.c
> +++ b/drivers/phy/tegra/xusb-tegra186.c
> @@ -68,6 +68,13 @@
> #define PORTX_SPEED_SUPPORT_MASK (0x3)
> #define PORT_SPEED_SUPPORT_GEN1 (0x0)
>
> +#define USB2_BATTERY_CHRG_OTGPADX_CTL1(x) (0x84 + (x) * 0x40)
> +#define PD_VREG (1 << 6)
> +#define VREG_LEV(x) (((x) & 0x3) << 7)
> +#define VREG_DIR(x) (((x) & 0x3) << 11)
> +#define VREG_DIR_IN VREG_DIR(1)
> +#define VREG_DIR_OUT VREG_DIR(2)
> +
> #define XUSB_PADCTL_USB2_OTG_PADX_CTL0(x) (0x88 + (x) * 0x40)
> #define HS_CURR_LEVEL(x) ((x) & 0x3f)
> #define TERM_SEL BIT(25)
> @@ -289,6 +296,37 @@ static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
> usb2->powered_on = false;
> }
>
> +static void tegra186_xusb_padctl_utmi_pad_set_protection_level(
> + struct tegra_xusb_port *port, int level,
> + enum tegra_vbus_dir dir)
It's more idiomatic to wrap after the return type and while at it,
perhaps make this name a little shorter, like so:
static void
tegra186_xusb_padctl_utmi_pad_set_protection(struct tegra_xusb_port *port,
int level,
enum tegra_vbus_dir dir)
> +{
> + u32 value;
> + struct tegra_xusb_padctl *padctl = port->padctl;
> + unsigned int index = port->index;
> +
> + value = padctl_readl(padctl, USB2_BATTERY_CHRG_OTGPADX_CTL1(index));
> +
> + if (level < 0) {
> + /* disable pad protection */
> + value |= PD_VREG;
> + value &= ~VREG_LEV(~0);
> + value &= ~VREG_DIR(~0);
> + } else {
> + if (dir == TEGRA_VBUS_SOURCE)
> + value |= VREG_DIR_OUT;
> + else if (dir == TEGRA_VBUS_SINK)
> + value |= VREG_DIR_IN;
> +
> + value &= ~PD_VREG;
> + value &= ~VREG_DIR(~0);
> + value &= ~VREG_LEV(~0);
> + value |= VREG_LEV(level);
> + }
> +
> + padctl_writel(padctl, value, USB2_BATTERY_CHRG_OTGPADX_CTL1(index));
> +}
> +
> +
There's an extra blank line above that can be dropped.
> static int tegra186_xusb_padctl_vbus_override(struct tegra_xusb_padctl *padctl,
> bool status)
> {
> @@ -935,6 +973,8 @@ static const struct tegra_xusb_padctl_ops tegra186_xusb_padctl_ops = {
> .vbus_override = tegra186_xusb_padctl_vbus_override,
> .utmi_pad_power_on = tegra_phy_xusb_utmi_pad_power_on,
> .utmi_pad_power_down = tegra_phy_xusb_utmi_pad_power_down,
> + .utmi_pad_set_protection_level =
> + tegra186_xusb_padctl_utmi_pad_set_protection_level,
> };
>
> #if IS_ENABLED(CONFIG_ARCH_TEGRA_186_SOC)
> diff --git a/drivers/phy/tegra/xusb-tegra210.c b/drivers/phy/tegra/xusb-tegra210.c
> index caf0890..7d84f1a 100644
> --- a/drivers/phy/tegra/xusb-tegra210.c
> +++ b/drivers/phy/tegra/xusb-tegra210.c
> @@ -74,6 +74,8 @@
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_MASK 0x3
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_VAL 0x1
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_FIX18 (1 << 6)
> +#define USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV(x) (((x) & 0x3) << 7)
> +#define USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_DIR(x) (((x) & 0x3) << 11)
>
> #define XUSB_PADCTL_USB2_OTG_PADX_CTL0(x) (0x088 + (x) * 0x40)
> #define XUSB_PADCTL_USB2_OTG_PAD_CTL0_PD_ZI (1 << 29)
> @@ -1116,6 +1118,33 @@ void tegra210_usb2_pad_power_down(struct phy *phy)
> usb2->powered_on = false;
> }
>
> +static void tegra210_xusb_padctl_utmi_pad_set_protection_level(
> + struct tegra_xusb_port *port, int level,
> + enum tegra_vbus_dir dir)
Same comment as above.
> +{
> + u32 value;
> + struct tegra_xusb_padctl *padctl = port->padctl;
> + unsigned int index = port->index;
> +
> + value = padctl_readl(padctl,
> + XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL1(index));
> +
> + if (level < 0) {
> + /* disable pad protection */
> + value |= XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_FIX18;
> + value &= USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV(~0);
> + value &= ~USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_DIR(~0);
> + } else {
> + value &= ~XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_FIX18;
> + value &= ~USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_DIR(~0);
> + value &= USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV(~0);
> + value |= USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV(level);
> + }
> +
> + padctl_writel(padctl, value,
> + XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL1(index));
> +}
> +
> static int tegra210_usb2_phy_set_mode(struct phy *phy, enum phy_mode mode,
> int submode)
> {
> @@ -2291,6 +2320,8 @@ static const struct tegra_xusb_padctl_ops tegra210_xusb_padctl_ops = {
> .utmi_port_reset = tegra210_utmi_port_reset,
> .utmi_pad_power_on = tegra210_usb2_pad_power_on,
> .utmi_pad_power_down = tegra210_usb2_pad_power_down,
> + .utmi_pad_set_protection_level =
> + tegra210_xusb_padctl_utmi_pad_set_protection_level,
> };
>
> static const char * const tegra210_xusb_padctl_supply_names[] = {
> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
> index 6995fc4..79e96b0 100644
> --- a/drivers/phy/tegra/xusb.h
> +++ b/drivers/phy/tegra/xusb.h
> @@ -259,6 +259,17 @@ to_sata_pad(struct tegra_xusb_pad *pad)
> */
> struct tegra_xusb_port_ops;
>
> +/*
> + * Tegra OTG port VBUS direction:
> + * default (based on port capability) or
> + * as source or sink
> + */
> +enum tegra_vbus_dir {
> + TEGRA_VBUS_DEFAULT,
> + TEGRA_VBUS_SOURCE,
> + TEGRA_VBUS_SINK
> +};
Can't we key off of something like the OTG mode? I thought we already
carried that elsewhere.
> +
> struct tegra_xusb_port {
> struct tegra_xusb_padctl *padctl;
> struct tegra_xusb_lane *lane;
> @@ -398,6 +409,8 @@ struct tegra_xusb_padctl_ops {
> int (*utmi_port_reset)(struct phy *phy);
> void (*utmi_pad_power_on)(struct phy *phy);
> void (*utmi_pad_power_down)(struct phy *phy);
> + void (*utmi_pad_set_protection_level)(struct tegra_xusb_port *port,
> + int max_ua, enum tegra_vbus_dir dir);
You call the variable "max_ua" here but it's "level" in the
implementations, which is slightly confusing. Please choose one and
stick with it. Also, if it's a value in microamperes, perhaps just make
it unsigned int?
Thierry
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