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, 4 insertions, 0 deletions

diff --git a/include/linux/wl12xx.h b/include/linux/wl12xx.h
index c1a743e..4b69739 100644
--- a/include/linux/wl12xx.h
+++ b/include/linux/wl12xx.h
@@ -53,8 +53,12 @@ struct wl12xx_platform_data {
 	bool use_eeprom;
 	int board_ref_clock;
 	int board_tcxo_clock;
+	unsigned long platform_quirks;
 };
 
+/* Platform does not support level trigger interrupts */
+#define WL12XX_PLATFORM_QUIRK_EDGE_IRQ	BIT(0)
+
 #ifdef CONFIG_WL12XX_PLATFORM_DATA
 
 int wl12xx_set_platform_data(const struct wl12xx_platform_data *data);