drivers: wifi: Add a workaround for read failures

In some scenarios like reading WDOG status, it was observed that
multiple retries are needed for the (Q)SPI read to be successful, so,
add a retry support.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

drivers/wifi/nrf700x/osal/hw_if/hal/src/hal_interrupt.c

@@ -134,15 +134,35 @@ static bool hal_rpu_irq_wdog_chk(struct nrf_wifi_hal_dev_ctx *hal_dev_ctx)
  enum nrf_wifi_status status = NRF_WIFI_STATUS_FAIL;
  unsigned int val = 0;
  bool ret = false;
+ unsigned int i, max_read_retries = 10;
 
- status = hal_rpu_reg_read(hal_dev_ctx,
- &val,
- RPU_REG_MIPS_MCU_UCCP_INT_STATUS);
+ for (i = 0; i < max_read_retries; i++) {
+ status = hal_rpu_reg_read(hal_dev_ctx,
+ &val,
+ RPU_REG_MIPS_MCU_UCCP_INT_STATUS);
 
- if (status != NRF_WIFI_STATUS_SUCCESS) {
+ if (status != NRF_WIFI_STATUS_SUCCESS) {
+ nrf_wifi_osal_log_err(hal_dev_ctx->hpriv->opriv,
+ "%s: Reading from interrupt status register failed\n",
+ __func__);
+ goto out;
+ }
+
+ if (val != 0xAAAAAAAA) {
+ break;
+ } else {
+ nrf_wifi_osal_log_err(hal_dev_ctx->hpriv->opriv,
+ "%s: Reading from interrupt status register failed 0x%x \n",
+ __func__,
+ val);
+ }
+ }
+
+ if (i == max_read_retries) {
  nrf_wifi_osal_log_err(hal_dev_ctx->hpriv->opriv,
- "%s: Reading from interrupt status register failed\n",
- __func__);
+ "%s: Reading from interrupt status register failed 0x%x \n",
+ __func__,
+ val);
  goto out;
  }