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wl12xx: Handle platforms without level trigger interrupts

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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>
This commit is contained in:
Ido Yariv 2011-03-31 10:07:01 +02:00 committed by Luciano Coelho
parent d2f4d47d84
commit 341b7cde6c
5 changed files with 32 additions and 2 deletions
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9
drivers/net/wireless/wl12xx/main.c
View File

@ -30,6 +30,7 @@
#include <linux/vmalloc.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/wl12xx.h>
#include "wl12xx.h"
#include "wl12xx_80211.h"
@ -719,6 +720,13 @@ irqreturn_t wl1271_irq(int irq, void *cookie)
set_bit(WL1271_FLAG_TX_PENDING, &wl->flags);
cancel_work_sync(&wl->tx_work);
/*
* In case edge triggered interrupt must be used, we cannot iterate
* more than once without introducing race conditions with the hardirq.
*/
if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
loopcount = 1;
mutex_lock(&wl->mutex);
wl1271_debug(DEBUG_IRQ, "IRQ work");
@ -3648,6 +3656,7 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
wl->ap_ps_map = 0;
wl->ap_fw_ps_map = 0;
wl->quirks = 0;
wl->platform_quirks = 0;
memset(wl->tx_frames_map, 0, sizeof(wl->tx_frames_map));
for (i = 0; i < ACX_TX_DESCRIPTORS; i++)

9
drivers/net/wireless/wl12xx/sdio.c
View File

@ -220,6 +220,7 @@ static int __devinit wl1271_probe(struct sdio_func *func,
struct ieee80211_hw *hw;
const struct wl12xx_platform_data *wlan_data;
struct wl1271 *wl;
unsigned long irqflags;
int ret;
/* We are only able to handle the wlan function */
@ -251,9 +252,15 @@ static int __devinit wl1271_probe(struct sdio_func *func,
wl->irq = wlan_data->irq;
wl->ref_clock = wlan_data->board_ref_clock;
wl->tcxo_clock = wlan_data->board_tcxo_clock;
wl->platform_quirks = wlan_data->platform_quirks;
if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
irqflags = IRQF_TRIGGER_RISING;
else
irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
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);

9
drivers/net/wireless/wl12xx/spi.c
View File

@ -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);

3
drivers/net/wireless/wl12xx/wl12xx.h
View File

@ -579,6 +579,9 @@ struct wl1271 {
/* Quirks of specific hardware revisions */
unsigned int quirks;
/* Platform limitations */
unsigned int platform_quirks;
};
struct wl1271_station {

4
include/linux/wl12xx.h
View File

@ -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);