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SubjectRe: [PATCH 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if typec-gpio-dir not specified
From
Hi Sinthu,

On 13/12/2022 14:48, Sinthu Raja wrote:
> It's possible that the Type-C plug orientation on the DIR line will be
> implemented through hardware design. In that situation, there won't be
> an external GPIO line available, but the driver still needs to address
> this since the DT won't use the typec-gpio-dir property.

The property is actually "typec-dir-gpios"

>
> Add code to handle LN10 Type-C swap if typec-gpio-dir property is not
> specified in DT.
>
> Remove typec-gpio-dir check to use minimum debounce from Type-C spec if
> it is not provided in DT

Why?

>
> Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
> ---
> drivers/phy/ti/phy-j721e-wiz.c | 65 +++++++++++++++++++++-------------
> 1 file changed, 40 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
> index 141b51af4427..b17eec632d49 100644
> --- a/drivers/phy/ti/phy-j721e-wiz.c
> +++ b/drivers/phy/ti/phy-j721e-wiz.c
> @@ -375,6 +375,7 @@ struct wiz {
> struct gpio_desc *gpio_typec_dir;
> int typec_dir_delay;
> u32 lane_phy_type[WIZ_MAX_LANES];
> + u32 lane_phy_reg[WIZ_MAX_LANES];
> struct clk *input_clks[WIZ_MAX_INPUT_CLOCKS];
> struct clk *output_clks[WIZ_MAX_OUTPUT_CLOCKS];
> struct clk_onecell_data clk_data;
> @@ -1231,14 +1232,28 @@ static int wiz_phy_reset_deassert(struct reset_controller_dev *rcdev,
> int ret;
>
> /* if typec-dir gpio was specified, set LN10 SWAP bit based on that */
> - if (id == 0 && wiz->gpio_typec_dir) {
> - if (wiz->typec_dir_delay)
> - msleep_interruptible(wiz->typec_dir_delay);
> -
> - if (gpiod_get_value_cansleep(wiz->gpio_typec_dir))
> - regmap_field_write(wiz->typec_ln10_swap, 1);
> - else
> - regmap_field_write(wiz->typec_ln10_swap, 0);
> + if (id == 0 && wiz->typec_dir_delay) {
> + msleep_interruptible(wiz->typec_dir_delay);

Why do you need to have this debounce delay if there was no GPIO to begin with.
You need to move the msleep call within the next if {} block.

> +
> + if (wiz->gpio_typec_dir) {
> + if (gpiod_get_value_cansleep(wiz->gpio_typec_dir))
> + regmap_field_write(wiz->typec_ln10_swap, 1);
> + else
> + regmap_field_write(wiz->typec_ln10_swap, 0);
> + } else {
> + /* if no typec-dir gpio was specified, and USB lines
> + * are connected to Lane 0 then set LN10 SWAP bit to 1.
> + */
> + u32 num_lanes = wiz->num_lanes;
> + int i;
> +
> + for (i = 0; i < num_lanes; i++) {typec-dir-gpios:
> + if ((wiz->lane_phy_type[i] == PHY_TYPE_USB3) \
> + && wiz->lane_phy_reg[i] == 0) {
> + regmap_field_write(wiz->typec_ln10_swap, 1);
> + }
> + }
> + }
> }
>
> if (id == 0) {
> @@ -1370,8 +1385,10 @@ static int wiz_get_lane_phy_types(struct device *dev, struct wiz *wiz)
> dev_dbg(dev, "%s: Lanes %u-%u have phy-type %u\n", __func__,
> reg, reg + num_lanes - 1, phy_type);
>
> - for (i = reg; i < reg + num_lanes; i++)
> + for (i = reg; i < reg + num_lanes; i++) {
> + wiz->lane_phy_reg[i] = reg;
> wiz->lane_phy_type[i] = phy_type;
> + }
> }
>
> return 0;
> @@ -1464,24 +1481,22 @@ static int wiz_probe(struct platform_device *pdev)
> goto err_addr_to_resource;
> }
>
> - if (wiz->gpio_typec_dir) {
> - ret = of_property_read_u32(node, "typec-dir-debounce-ms",
> - &wiz->typec_dir_delay);
> - if (ret && ret != -EINVAL) {
> - dev_err(dev, "Invalid typec-dir-debounce property\n");
> - goto err_addr_to_resource;
> - }
> + ret = of_property_read_u32(node, "typec-dir-debounce-ms",
> + &wiz->typec_dir_delay);
> + if (ret && ret != -EINVAL) {
> + dev_err(dev, "Invalid typec-dir-debounce property\n");
> + goto err_addr_to_resource;
> + }

Why do you need to know this debounce value if you don't have a valid GPIO line?

>
> - /* use min. debounce from Type-C spec if not provided in DT */
> - if (ret == -EINVAL)
> - wiz->typec_dir_delay = WIZ_TYPEC_DIR_DEBOUNCE_MIN;
> + /* use min. debounce from Type-C spec if not provided in DT */
> + if (ret == -EINVAL)
> + wiz->typec_dir_delay = WIZ_TYPEC_DIR_DEBOUNCE_MIN;
>
> - if (wiz->typec_dir_delay < WIZ_TYPEC_DIR_DEBOUNCE_MIN ||
> - wiz->typec_dir_delay > WIZ_TYPEC_DIR_DEBOUNCE_MAX) {
> - ret = -EINVAL;
> - dev_err(dev, "Invalid typec-dir-debounce property\n");
> - goto err_addr_to_resource;
> - }
> + if (wiz->typec_dir_delay < WIZ_TYPEC_DIR_DEBOUNCE_MIN ||
> + wiz->typec_dir_delay > WIZ_TYPEC_DIR_DEBOUNCE_MAX) {
> + ret = -EINVAL;
> + dev_err(dev, "Invalid typec-dir-debounce property\n");
> + goto err_addr_to_resource;
> }

All these changes are unnecessary.

>
> ret = wiz_get_lane_phy_types(dev, wiz);

cheers,
-roger

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