This is a note to let you know that I've just added the patch titled
usb: typec: fusb302: Fix masking of comparator and bc_lvl interrupts
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 362468830dd5bea8bf6ad5203b2ea61f8a4e8288 Mon Sep 17 00:00:00 2001
From: Ondrej Jirman megous@megous.com Date: Mon, 8 Nov 2021 11:28:32 +0100 Subject: usb: typec: fusb302: Fix masking of comparator and bc_lvl interrupts
The code that enables either BC_LVL or COMP_CHNG interrupt in tcpm_set_cc wrongly assumes that the interrupt is unmasked by writing 1 to the apropriate bit in the mask register. In fact, interrupts are enabled when the mask is 0, so the tcpm_set_cc enables interrupt for COMP_CHNG when it expects BC_LVL interrupt to be enabled.
This causes inability of the driver to recognize cable unplug events in host mode (unplug is recognized only via a COMP_CHNG interrupt).
In device mode this bug was masked by simultaneous triggering of the VBUS change interrupt, because of loss of VBUS when the port peer is providing power.
Fixes: 48242e30532b ("usb: typec: fusb302: Revert "Resolve fixed power role contract setup"") Cc: stable stable@vger.kernel.org Cc: Hans de Goede hdegoede@redhat.com Reviewed-by: Hans de Goede hdegoede@redhat.com Acked-by: Heikki Krogerus heikki.krogerus@linux.intel.com Signed-off-by: Ondrej Jirman megous@megous.com Link: https://lore.kernel.org/r/20211108102833.2793803-1-megous@megous.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/tcpm/fusb302.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c index 7a2a17866a82..72f9001b0792 100644 --- a/drivers/usb/typec/tcpm/fusb302.c +++ b/drivers/usb/typec/tcpm/fusb302.c @@ -669,25 +669,27 @@ static int tcpm_set_cc(struct tcpc_dev *dev, enum typec_cc_status cc) ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK, FUSB_REG_MASK_BC_LVL | FUSB_REG_MASK_COMP_CHNG, - FUSB_REG_MASK_COMP_CHNG); + FUSB_REG_MASK_BC_LVL); if (ret < 0) { fusb302_log(chip, "cannot set SRC interrupt, ret=%d", ret); goto done; } chip->intr_comp_chng = true; + chip->intr_bc_lvl = false; break; case TYPEC_CC_RD: ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK, FUSB_REG_MASK_BC_LVL | FUSB_REG_MASK_COMP_CHNG, - FUSB_REG_MASK_BC_LVL); + FUSB_REG_MASK_COMP_CHNG); if (ret < 0) { fusb302_log(chip, "cannot set SRC interrupt, ret=%d", ret); goto done; } chip->intr_bc_lvl = true; + chip->intr_comp_chng = false; break; default: break;