From 57aa557f110d9fb6980cb58498cfd3a51feb5473 Mon Sep 17 00:00:00 2001 From: =?utf8?q?J=C3=A9r=C3=B4me=20Pouiller?= Date: Tue, 5 May 2020 14:37:49 +0200 Subject: [PATCH] staging: wfx: introduce a way to poll IRQ MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://lore.kernel.org/r/20200505123757.39506-8-Jerome.Pouiller@silabs.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/wfx/bh.c | 28 ++++++++++++++++++++++++++++ drivers/staging/wfx/bh.h | 1 + 2 files changed, 29 insertions(+) diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c index ba7fa0a..d3e7eed 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 93ca984..4b73437 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 */ -- 2.7.4