staging: wilc1000: High latency on handling FW interrupts

With pm_runtime enabled, the host shutsdown its SD clock which causes
high latency on handling interrupts on SAMA5D4 and new kernels.
The impact of that was high ping latency when pinging from other STAs
to WILC.

Closes #13

Signed-off-by: Adham Abozaeid <[email protected]>

Author: Adham Abozaeid

wilc/linux_wlan.c

@@ -731,7 +731,7 @@ static int linux_wlan_start_firmware(struct net_device *dev)
 	PRINT_INFO(vif->ndev, INIT_DBG, "Waiting for FW to get ready ...\n");
 
 	if (!wait_for_completion_timeout(&wilc->sync_event,
-					 msecs_to_jiffies(1500))) {
+					 msecs_to_jiffies(500))) {
 		PRINT_INFO(vif->ndev, INIT_DBG, "Firmware start timed out\n");
 		return -ETIME;
 	}

wilc/wilc_sdio.c

@@ -8,6 +8,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
 #include <linux/module.h>
+#include <linux/pm_runtime.h>
 
 #include "wilc_wfi_netdevice.h"
 #include "wilc_wlan.h"
@@ -734,6 +735,10 @@ static int sdio_init(struct wilc *wilc, bool resume)
 
 	dev_info(&func->dev, "SDIO speed: %d\n",
 		func->card->host->ios.clock);
+
+	/* Patch for sdio interrupt latency issue */
+	pm_runtime_get_sync(mmc_dev(func->card->host));
+
 	init_waitqueue_head(&sdio_intr_waitqueue);
 	sdio_priv->irq_gpio = (wilc->io_type == HIF_SDIO_GPIO_IRQ);