wifi: ath11k: Don't exit on wakeup failure

Currently, ath11k_pcic_read() returns an error if wakeup()
fails, this makes firmware crash debug quite hard because we can
get nothing.

Change to go ahead on wakeup failure, in that case we still may
get something valid to check. There should be no mislead due
to incorrect content because we are aware of the failure with the
log printed.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220928015140.5431-1-quic_bqiang@quicinc.com

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

@@ -218,9 +218,16 @@ int ath11k_pcic_read(struct ath11k_base *ab, void *buf, u32 start, u32 end)
 	if (wakeup_required && ab->pci.ops->wakeup) {
 		ret = ab->pci.ops->wakeup(ab);
 		if (ret) {
-			ath11k_warn(ab, "failed to wakeup for read from 0x%x: %d\n",
-				    start, ret);
-			return ret;
+			ath11k_warn(ab,
+				    "wakeup failed, data may be invalid: %d",
+				    ret);
+			/* Even though wakeup() failed, continue processing rather
+			 * than returning because some parts of the data may still
+			 * be valid and useful in some cases, e.g. could give us
+			 * some clues on firmware crash.
+			 * Mislead due to invalid data could be avoided because we
+			 * are aware of the wakeup failure.
+			 */
 		}
 	}