linux-kernel - Re: [PATCH V2 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if typec-dir-gpios not specified

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Date:   Wed, 11 Jan 2023 11:48:20 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Sinthu Raja <sinthu.raja@...tralsolutions.com>,
        Vinod Koul <vkoul@...nel.org>,
        Ravi Gunasekaran <r-gunasekaran@...com>,
        Siddharth Vadapalli <s-vadapalli@...com>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sinthu Raja <sinthu.raja@...com>
Subject: Re: [PATCH V2 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if
 typec-dir-gpios not specified



On 06/01/2023 09:17, Sinthu Raja wrote:
> From: Sinthu Raja <sinthu.raja@...com>
> 
> 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-dir-gpios property.
> 
> Add code to handle LN10 Type-C swap if typec-dir-gpios property is not
> specified in DT.
> 
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>

Reviewed-by: Roger Quadros <rogerq@...nel.org>

> ---
> 
> Changes in V2:
> =============
> Address review comments:
> - Update commit description as per review comments.
> - Restore code to check only debounce delay only if typec-dir-gpios property is specified in DT.
> - Rename lane_phy_reg variable as master_lane_num.
> - Update inline comments.
> 
> V1: https://lore.kernel.org/lkml/20221213124854.3779-2-sinthu.raja@ti.com/T/#mb1f9f8d26b4ef735bbbc3994a1e9c16d52ca2c19
> 
>  drivers/phy/ti/phy-j721e-wiz.c | 39 +++++++++++++++++++++++++---------
>  1 file changed, 29 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
> index ddce5ef7711c..571f0ca18874 100644
> --- a/drivers/phy/ti/phy-j721e-wiz.c
> +++ b/drivers/phy/ti/phy-j721e-wiz.c
> @@ -376,6 +376,7 @@ struct wiz {
>  	struct gpio_desc	*gpio_typec_dir;
>  	int			typec_dir_delay;
>  	u32 lane_phy_type[WIZ_MAX_LANES];
> +	u32 master_lane_num[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;
> @@ -1234,15 +1235,31 @@ static int wiz_phy_reset_deassert(struct reset_controller_dev *rcdev,
>  	struct wiz *wiz = dev_get_drvdata(dev);
>  	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) {
> +		/* if typec-dir gpio was specified, set LN10 SWAP bit based on that */
> +		if (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);
> +		} else {
> +			/* if no typec-dir gpio was specified and PHY type is
> +			 * USB3 with master lane number is '0', set LN10 SWAP
> +			 * bit to '1'
> +			 */
> +			u32 num_lanes = wiz->num_lanes;
> +			int i;
> +
> +			for (i = 0; i < num_lanes; i++) {
> +				if ((wiz->lane_phy_type[i] == PHY_TYPE_USB3)
> +						&& wiz->master_lane_num[i] == 0) {
> +					regmap_field_write(wiz->typec_ln10_swap, 1);
> +				}
> +			}
> +		}
>  	}
>  
>  	if (id == 0) {
> @@ -1386,8 +1403,10 @@ 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->master_lane_num[i] = reg;
>  			wiz->lane_phy_type[i] = phy_type;
> +		}
>  	}
>  
>  	return 0;

--
cheers,
-roger