[PATCH 5.15 474/570] phy: renesas: rcar-gen3-usb2: Fix role detection on unbind/bind

Greg Kroah-Hartman
2026-04-13T16:39:37Z

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

commit 54c4c58713aaff76c2422ff5750e557ab3b100d7 upstream.

It has been observed on the Renesas RZ/G3S SoC that unbinding and binding
the PHY driver leads to role autodetection failures. This issue occurs when
PHY 3 is the first initialized PHY. PHY 3 does not have an interrupt
associated with the USB2_INT_ENABLE register (as
rcar_gen3_int_enable[3] = 0). As a result, rcar_gen3_init_otg() is called
to initialize OTG without enabling PHY interrupts.

To resolve this, add rcar_gen3_is_any_otg_rphy_initialized() and call it in
role_store(), role_show(), and rcar_gen3_init_otg(). At the same time,
rcar_gen3_init_otg() is only called when initialization for a PHY with
interrupt bits is in progress. As a result, the
struct rcar_gen3_phy::otg_initialized is no longer needed.

[claudiu.beznea: declare the i iterrator from
rcar_gen3_is_any_otg_rphy_initialized() outside of for loop]

Fixes: 549b6b55b005 ("phy: renesas: rcar-gen3-usb2: enable/disable independent irqs")
Cc: stable@vger.kernel.org
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/r/20250507125032.565017-2-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/phy/renesas/phy-rcar-gen3-usb2.c | 32 +++++++++++-------------
1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 670514d44fe3f..8c03b683ba1c9 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -103,7 +103,6 @@ struct rcar_gen3_phy {
struct rcar_gen3_chan *ch;
u32 int_enable_bits;
bool initialized;
- bool otg_initialized;
bool powered;
};

@@ -311,16 +310,16 @@ static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
return false;
}

-static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
+static bool rcar_gen3_is_any_otg_rphy_initialized(struct rcar_gen3_chan *ch)
{
- int i;
+ enum rcar_gen3_phy_index i;

- for (i = 0; i < NUM_OF_PHYS; i++) {
- if (ch->rphys[i].otg_initialized)
- return false;
+ for (i = PHY_INDEX_BOTH_HC; i <= PHY_INDEX_EHCI; i++) {
+ if (ch->rphys[i].initialized)
+ return true;
}

- return true;
+ return false;
}

static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
@@ -342,7 +341,7 @@ static ssize_t role_store(struct device *dev, struct device_attribute *attr,
bool is_b_device;
enum phy_mode cur_mode, new_mode;

- if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
+ if (!ch->is_otg_channel || !rcar_gen3_is_any_otg_rphy_initialized(ch))
return -EIO;

if (sysfs_streq(buf, "host"))
@@ -380,7 +379,7 @@ static ssize_t role_show(struct device *dev, struct device_attribute *attr,
{
struct rcar_gen3_chan *ch = dev_get_drvdata(dev);

- if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
+ if (!ch->is_otg_channel || !rcar_gen3_is_any_otg_rphy_initialized(ch))
return -EIO;

return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
@@ -393,6 +392,9 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
void __iomem *usb2_base = ch->base;
u32 val;

+ if (!ch->is_otg_channel || rcar_gen3_is_any_otg_rphy_initialized(ch))
+ return;
+
/* Should not use functions of read-modify-write a register */
val = readl(usb2_base + USB2_LINECTRL1);
val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
@@ -459,12 +461,9 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)
writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
}

- /* Initialize otg part */
- if (channel->is_otg_channel) {
- if (rcar_gen3_needs_init_otg(channel))
- rcar_gen3_init_otg(channel);
- rphy->otg_initialized = true;
- }
+ /* Initialize otg part (only if we initialize a PHY with IRQs). */
+ if (rphy->int_enable_bits)
+ rcar_gen3_init_otg(channel);

rphy->initialized = true;

@@ -480,9 +479,6 @@ static int rcar_gen3_phy_usb2_exit(struct phy *p)

rphy->initialized = false;

- if (channel->is_otg_channel)
- rphy->otg_initialized = false;
-
val = readl(usb2_base + USB2_INT_ENABLE);
val &= ~rphy->int_enable_bits;
if (!rcar_gen3_is_any_rphy_initialized(channel))
--
2.53.0