wl12xx: Handle platforms without level trigger interrupts

Some platforms are incapable of triggering on level interrupts. Add a
platform quirks member in the platform data structure, as well as an
edge interrupt quirk which can be set on such platforms.

When the interrupt is requested with IRQF_TRIGGER_RISING, IRQF_ONESHOT
cannot be used, as we might miss interrupts that occur after the FW
status is cleared and before the threaded interrupt handler exits.

Moreover, when IRQF_ONESHOT is not set, iterating more than once in the
threaded interrupt handler introduces a few race conditions between this
handler and the hardirq handler. Currently this is worked around by
limiting the loop to one iteration only. This workaround has an impact
on performance. To remove to this restriction, the race conditions will
need to be addressed.

Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/net/wireless/wl12xx/spi.c b/drivers/net/wireless/wl12xx/spi.c
index 7b82b5f0e490..51662bb68019 100644
--- a/drivers/net/wireless/wl12xx/spi.c
+++ b/drivers/net/wireless/wl12xx/spi.c
@@ -364,6 +364,7 @@ static int __devinit wl1271_probe(struct spi_device *spi)
         struct wl12xx_platform_data *pdata;
         struct ieee80211_hw *hw;
         struct wl1271 *wl;
+        unsigned long irqflags;
         int ret;
 
         pdata = spi->dev.platform_data;
@@ -402,6 +403,12 @@ static int __devinit wl1271_probe(struct spi_device *spi)
 
         wl->ref_clock = pdata->board_ref_clock;
         wl->tcxo_clock = pdata->board_tcxo_clock;
+        wl->platform_quirks = pdata->platform_quirks;
+
+        if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
+                irqflags = IRQF_TRIGGER_RISING;
+        else
+                irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
 
         wl->irq = spi->irq;
         if (wl->irq < 0) {
@@ -411,7 +418,7 @@ static int __devinit wl1271_probe(struct spi_device *spi)
         }
 
         ret = request_threaded_irq(wl->irq, wl1271_hardirq, wl1271_irq,
-                                   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+                                   irqflags,
                                    DRIVER_NAME, wl);
         if (ret < 0) {
                 wl1271_error("request_irq() failed: %d", ret);