diff options
| author | Jérôme Pouiller | 2020-05-05 14:37:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2020-05-13 13:26:41 +0200 |
| commit | 57aa557f110d9fb6980cb58498cfd3a51feb5473 (patch) | |
| tree | 61613412ea2d0bc877ab3f489e19d488feef18d8 | |
| parent | a7efb62509d8144380964720d40767f0a54f3479 (diff) | |
staging: wfx: introduce a way to poll IRQ
It is possible to check if an IRQ is ending by polling the control
register. This function must used with care: if an IRQ fires while the
host reads control register, the IRQ can be lost. However, it could be
useful in some cases.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200505123757.39506-8-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/wfx/bh.c | 28 | ||||
| -rw-r--r-- | drivers/staging/wfx/bh.h | 1 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c index ba7fa0a7cd9a..d3e7eed89c38 100644 --- a/drivers/staging/wfx/bh.c +++ b/drivers/staging/wfx/bh.c @@ -307,6 +307,34 @@ void wfx_bh_request_tx(struct wfx_dev *wdev) queue_work(system_highpri_wq, &wdev->hif.bh); } +/* + * If IRQ is not available, this function allow to manually poll the control + * register and simulate an IRQ ahen an event happened. + * + * Note that the device has a bug: If an IRQ raise while host read control + * register, the IRQ is lost. So, use this function carefully (only duing + * device initialisation). + */ +void wfx_bh_poll_irq(struct wfx_dev *wdev) +{ + ktime_t now, start; + u32 reg; + + start = ktime_get(); + for (;;) { + control_reg_read(wdev, ®); + now = ktime_get(); + if (reg & 0xFFF) + break; + if (ktime_after(now, ktime_add_ms(start, 1000))) { + dev_err(wdev->dev, "time out while polling control register\n"); + return; + } + udelay(200); + } + wfx_bh_request_rx(wdev); +} + void wfx_bh_register(struct wfx_dev *wdev) { INIT_WORK(&wdev->hif.bh, bh_work); diff --git a/drivers/staging/wfx/bh.h b/drivers/staging/wfx/bh.h index 93ca98424e0b..4b73437869e1 100644 --- a/drivers/staging/wfx/bh.h +++ b/drivers/staging/wfx/bh.h @@ -28,5 +28,6 @@ void wfx_bh_register(struct wfx_dev *wdev); void wfx_bh_unregister(struct wfx_dev *wdev); void wfx_bh_request_rx(struct wfx_dev *wdev); void wfx_bh_request_tx(struct wfx_dev *wdev); +void wfx_bh_poll_irq(struct wfx_dev *wdev); #endif /* WFX_BH_H */ |