diff options
| author |   Sing-Han Chen <singhanc@nvidia.com> | 2022-01-12 17:41:43 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-26 13:41:19 +0100 |
| commit | 825911492eb15bf8bb7fb94bc0c0421fe7a6327d (patch) | |
| tree | f679db6fdd37ae95dd597ec209f2c56bfa45d68b | |
| parent | USB: core: Fix hang in usb_kill_urb by adding memory barriers (diff) | |
| download | linux-dev-825911492eb15bf8bb7fb94bc0c0421fe7a6327d.tar.xz linux-dev-825911492eb15bf8bb7fb94bc0c0421fe7a6327d.zip | |
ucsi_ccg: Check DEV_INT bit only when starting CCG4
CCGx clears Bit 0:Device Interrupt in the INTR_REG
if CCGx is reset successfully. However, there might
be a chance that other bits in INTR_REG are not
cleared due to internal data queued in PPM. This case
misleads the driver that CCGx reset failed.
The commit checks bit 0 in INTR_REG and ignores other
bits. The ucsi driver would reset PPM later.
Fixes: 247c554a14aa ("usb: typec: ucsi: add support for Cypress CCGx")
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
Signed-off-by: Wayne Chang <waynec@nvidia.com>
Link: https://lore.kernel.org/r/20220112094143.628610-1-waynec@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/typec/ucsi/ucsi_ccg.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c index bff96d64dddf..6db7c8ddd51c 100644 --- a/drivers/usb/typec/ucsi/ucsi_ccg.c +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c @@ -325,7 +325,7 @@ static int ucsi_ccg_init(struct ucsi_ccg *uc) if (status < 0) return status; - if (!data) + if (!(data & DEV_INT)) return 0; status = ccg_write(uc, CCGX_RAB_INTR_REG, &data, sizeof(data)); |