ath11k: mhi: print a warning if firmware crashed

There was no way to detect if the firmware crashed so add a warning. At the
moment the firmware is not restarted or anything like that, so when this
happens ath11k modules need to be reloaded.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1607609124-17250-2-git-send-email-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/mhi.c

@@ -190,6 +190,15 @@ static void ath11k_mhi_op_runtime_put(struct mhi_controller *mhi_cntrl)
 static void ath11k_mhi_op_status_cb(struct mhi_controller *mhi_cntrl,
 				    enum mhi_callback cb)
 {
+	struct ath11k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
+
+	switch (cb) {
+	case MHI_CB_SYS_ERROR:
+		ath11k_warn(ab, "firmware crashed: MHI_CB_SYS_ERROR\n");
+		break;
+	default:
+		break;
+	}
 }
 
 static int ath11k_mhi_op_read_reg(struct mhi_controller *mhi_cntrl,