On Tue, 13 Oct 2026 at 22:38:09 +0530, Balaji Selvanathan wrote:
The TypeC port-select mux was always programmed with SW_PORTSELECT_MUX
set and SW_PORTSELECT_VAL left clear, regardless of which way the
USB-C cable was inserted. On a board where the cable goes in reversed,
the SuperSpeed/DP lanes end up routed to the wrong side of the
connector, so USB3/DP never comes up correctly.
Cable orientation is reported by a GPIO on the qcom,pmic-glink node
("orientation-gpios"), and is now sampled each time the PHY is
enabled to check for the orientation.
Taken from Linux commit 815891eee668 ("phy: qcom-qmp-combo: Introduce
orientation variable").
Tested on QCS6490 RB3 Gen2 board.
Signed-off-by: Balaji Selvanathan <[email protected]>
---
Changes in v2:
- Instead of reading the orientation at probe, read it only during the PHY init
- Updated the commit message to better explain why this change is required
- Link to v1:
https://lore.kernel.org/u-boot/20260724-kodiak_ss_orientation-v1-1-d9d8fd271...@oss.qualcomm.com/
---
drivers/phy/qcom/phy-qcom-qmp-combo.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
Reviewed-by: Sumit Garg <[email protected]>
-Sumit
diff --git a/drivers/phy/qcom/phy-qcom-qmp-combo.c
b/drivers/phy/qcom/phy-qcom-qmp-combo.c
index 0d63e482ee4..65141489d51 100644
--- a/drivers/phy/qcom/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qcom/phy-qcom-qmp-combo.c
@@ -7,10 +7,12 @@
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/devres.h>
+#include <dm/ofnode.h>
#include <generic-phy.h>
#include <reset.h>
#include <power/regulator.h>
#include <asm/io.h>
+#include <asm-generic/gpio.h>
#include <linux/bitops.h>
#include <linux/compat.h>
#include <linux/delay.h>
@@ -39,6 +41,7 @@
#define DP_MODE BIT(1) /* enables DP mode */
/* QPHY_V3_DP_COM_TYPEC_CTRL register bits */
+#define SW_PORTSELECT_VAL BIT(0)
#define SW_PORTSELECT_MUX BIT(1)
/* PHY slot identifiers for device tree phandle arguments */
@@ -283,6 +286,27 @@ static int qmp_combo_com_exit(struct qmp_combo *qmp)
return 0;
}
+static bool qmp_combo_read_orientation(void)
+{
+ ofnode node;
+ struct gpio_desc desc;
+ int ret, val;
+
+ node = ofnode_by_compatible(ofnode_null(), "qcom,pmic-glink");
+ if (!ofnode_valid(node))
+ return false;
+
+ ret = gpio_request_by_name_nodev(node, "orientation-gpios", 0,
+ &desc, GPIOD_IS_IN);
+ if (ret)
+ return false;
+
+ val = dm_gpio_get_value(&desc);
+ dm_gpio_free(desc.dev, &desc);
+
+ return val > 0;
+}
+
static int qmp_combo_com_init(struct qmp_combo *qmp)
{
void __iomem *com = qmp->com;
@@ -333,6 +357,8 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
val = SW_PORTSELECT_MUX;
+ if (qmp_combo_read_orientation())
+ val |= SW_PORTSELECT_VAL;
writel(val, com + QPHY_V3_DP_COM_TYPEC_CTRL);
writel(USB3_MODE | DP_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
---
base-commit: fed92546960a92177d67c0b8d7b22385f50fed29
change-id: 20261013-ss-orientation-d85a156e806a
Best regards,
--
Balaji Selvanathan <[email protected]>
