linux-kernel - [PATCH V4 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if typec-dir-gpios not specified

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Date:   Fri, 13 Jan 2023 20:36:14 +0530
From:   Sinthu Raja <sinthu.raja@...tralsolutions.com>
To:     Roger Quadros <rogerq@...nel.org>, 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: [PATCH V4 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if typec-dir-gpios not specified

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>
---

No changes in V4.

Changes in V3:
=============
- Added Reviewed-by tag.

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.

 drivers/phy/ti/phy-j721e-wiz.c | 38 +++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
index ddce5ef7711c..b5c1b82e99a6 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 +1235,30 @@ 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)
+					if (wiz->master_lane_num[i] == 0)
+						regmap_field_write(wiz->typec_ln10_swap, 1);
+			}
+		}
 	}
 
 	if (id == 0) {
@@ -1386,8 +1402,10 @@ 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;
-- 
2.36.1