If CONFIG_DEBUG_SHIRQ was enabled, r8a77951-salvator-xs could boot
correctly. If we appended "earlycon keep_bootcon" to the kernel
command like, we could get kernel log like below.
SError Interrupt on CPU0, code 0xbf000002 -- SError
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc3-salvator-x-00505-g6c843129e6faaf01 #785
Hardware name: Renesas Salvator-X 2nd version board based on r8a77951 (DT)
pstate: 60400085 (nZCv daIf +PAN -UAO BTYPE=--)
pc : rcar_gen3_phy_usb2_irq+0x14/0x54
lr : free_irq+0xf4/0x27c
This means free_irq() calls the interrupt handler while PM runtime
is not getting if DEBUG_SHIRQ is enabled and rcar_gen3_phy_usb2_probe()
failed. To fix the issue, add a condition into the interrupt
handler to avoid register access if any phys are not initialized.
Note that rcar_gen3_is_any_rphy_initialized() was introduced on v5.2.
So, if we backports this patch to v5.1 or less, we need to make
other way.
Reported-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Reported-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Fixes: 9f391c574efc ("phy: rcar-gen3-usb2: add runtime ID/VBUS pin detection")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/phy/renesas/phy-rcar-gen3-usb2.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index bfb22f8..91c732d 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -507,9 +507,13 @@ static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
{
struct rcar_gen3_chan *ch = _ch;
void __iomem *usb2_base = ch->base;
- u32 status = readl(usb2_base + USB2_OBINTSTA);
+ u32 status;
irqreturn_t ret = IRQ_NONE;
+ if (!rcar_gen3_is_any_rphy_initialized(ch))
+ return ret;
+
+ status = readl(usb2_base + USB2_OBINTSTA);
if (status & USB2_OBINT_BITS) {
dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
--
2.7.4
