wl1271: Update interrupt handling by removing an extra SPI read

Remove separate interrupt register reading from the interrupt handling
routine. This will slightly improve interrupt performance.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index 22d44ba..8ac9bc1 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -76,20 +76,14 @@ static void wl1271_power_on(struct wl1271 *wl)
        wl->set_power(true);
 }
 
-static void wl1271_fw_status(struct wl1271 *wl, struct wl1271_fw_status *status)
+static void wl1271_fw_status(struct wl1271 *wl,
+                            struct wl1271_fw_status *status)
 {
        u32 total = 0;
        int i;
 
-       /*
-        * FIXME: Reading the FW status directly from the registers seems to
-        * be the right thing to do, but it doesn't work.  And in the
-        * reference driver, there is a workaround called
-        * USE_SDIO_24M_WORKAROUND, which reads the status from memory
-        * instead, so we do the same here.
-        */
-
-       wl1271_spi_mem_read(wl, STATUS_MEM_ADDRESS, status, sizeof(*status));
+       wl1271_spi_reg_read(wl, FW_STATUS_ADDR, status,
+                           sizeof(*status), false);
 
        wl1271_debug(DEBUG_IRQ, "intr: 0x%x (fw_rx_counter = %d, "
                     "drv_rx_counter = %d, tx_results_counter = %d)",
@@ -114,11 +108,10 @@ static void wl1271_fw_status(struct wl1271 *wl, struct wl1271_fw_status *status)
        wl->time_offset = jiffies_to_usecs(jiffies) - status->fw_localtime;
 }
 
-#define WL1271_IRQ_MAX_LOOPS 10
 static void wl1271_irq_work(struct work_struct *work)
 {
-       u32 intr, ctr = WL1271_IRQ_MAX_LOOPS;
        int ret;
+       u32 intr;
        struct wl1271 *wl =
                container_of(work, struct wl1271, irq_work);
 
@@ -135,7 +128,8 @@ static void wl1271_irq_work(struct work_struct *work)
 
        wl1271_reg_write32(wl, ACX_REG_INTERRUPT_MASK, WL1271_ACX_INTR_ALL);
 
-       intr = wl1271_reg_read32(wl, ACX_REG_INTERRUPT_CLEAR);
+       wl1271_fw_status(wl, wl->fw_status);
+       intr = wl->fw_status->intr;
        if (!intr) {
                wl1271_debug(DEBUG_IRQ, "Zero interrupt received.");
                goto out_sleep;
@@ -143,43 +137,35 @@ static void wl1271_irq_work(struct work_struct *work)
 
        intr &= WL1271_INTR_MASK;
 
-       do {
-               wl1271_fw_status(wl, wl->fw_status);
-
-
-               if (intr & (WL1271_ACX_INTR_EVENT_A |
-                           WL1271_ACX_INTR_EVENT_B)) {
-                       wl1271_debug(DEBUG_IRQ,
-                                    "WL1271_ACX_INTR_EVENT (0x%x)", intr);
-                       if (intr & WL1271_ACX_INTR_EVENT_A)
-                               wl1271_event_handle(wl, 0);
-                       else
-                               wl1271_event_handle(wl, 1);
-               }
+       if (intr & (WL1271_ACX_INTR_EVENT_A |
+                   WL1271_ACX_INTR_EVENT_B)) {
+               wl1271_debug(DEBUG_IRQ,
+                            "WL1271_ACX_INTR_EVENT (0x%x)", intr);
+               if (intr & WL1271_ACX_INTR_EVENT_A)
+                       wl1271_event_handle(wl, 0);
+               else
+                       wl1271_event_handle(wl, 1);
+       }
 
-               if (intr & WL1271_ACX_INTR_INIT_COMPLETE)
-                       wl1271_debug(DEBUG_IRQ,
-                                    "WL1271_ACX_INTR_INIT_COMPLETE");
+       if (intr & WL1271_ACX_INTR_INIT_COMPLETE)
+               wl1271_debug(DEBUG_IRQ,
+                            "WL1271_ACX_INTR_INIT_COMPLETE");
 
-               if (intr & WL1271_ACX_INTR_HW_AVAILABLE)
-                       wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_HW_AVAILABLE");
+       if (intr & WL1271_ACX_INTR_HW_AVAILABLE)
+               wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_HW_AVAILABLE");
 
-               if (intr & WL1271_ACX_INTR_DATA) {
-                       u8 tx_res_cnt = wl->fw_status->tx_results_counter -
-                               wl->tx_results_count;
+       if (intr & WL1271_ACX_INTR_DATA) {
+               u8 tx_res_cnt = wl->fw_status->tx_results_counter -
+                       wl->tx_results_count;
 
-                       wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_DATA");
+               wl1271_debug(DEBUG_IRQ, "WL1271_ACX_INTR_DATA");
 
-                       /* check for tx results */
-                       if (tx_res_cnt)
-                               wl1271_tx_complete(wl, tx_res_cnt);
+               /* check for tx results */
+               if (tx_res_cnt)
+                       wl1271_tx_complete(wl, tx_res_cnt);
 
-                       wl1271_rx(wl, wl->fw_status);
-               }
-
-               intr = wl1271_reg_read32(wl, ACX_REG_INTERRUPT_CLEAR);
-               intr &= WL1271_INTR_MASK;
-       } while (intr && --ctr);
+               wl1271_rx(wl, wl->fw_status);
+       }
 
 out_sleep:
        wl1271_reg_write32(wl, ACX_REG_INTERRUPT_MASK,

diff --git a/drivers/net/wireless/wl12xx/wl1271_reg.h b/drivers/net/wireless/wl12xx/wl1271_reg.h
index bd12615..6af87b5 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_reg.h
+++ b/drivers/net/wireless/wl12xx/wl1271_reg.h
@@ -34,7 +34,7 @@
 #define REGISTERS_WORK_SIZE 0x0000b000
 
 #define HW_ACCESS_ELP_CTRL_REG_ADDR         0x1FFFC
-#define STATUS_MEM_ADDRESS                  0x40400
+#define FW_STATUS_ADDR                      (0x14FC0 + 0xA000)
 
 /* ELP register commands */
 #define ELPCTRL_WAKE_UP             0x1