qcacmn: Add stats for register write failure

Sometimes the register write in windowed region
are not going through, thereby retaining the
previous value, which can be incorrect for a
certain mode of operation for the driver.

This kind of incorrect register values, due to
a register write not succeeding, can lead to
unwanted issues. Also the simple logging of
any such occcurence can be over-written in the
logs, thereby going unnoticed.

Add a HAL level statistics to maintain the
count of such failed register writes.

Change-Id: Ib5e98705c23f0c916cb85f518576663710eb30e0
CRs-Fixed: 2611839

hal/wifi3.0/hal_internal.h

@@ -474,6 +474,16 @@ struct hal_hw_txrx_ops {
 	uint8_t (*hal_rx_mpdu_start_tlv_tag_valid)(void *rx_tlv_hdr);
 };
 
+/**
+ * struct hal_soc_stats - Hal layer stats
+ * @reg_write_fail: number of failed register writes
+ *
+ * This structure holds all the statistics at HAL layer.
+ */
+struct hal_soc_stats {
+	uint32_t reg_write_fail;
+};
+
 /**
  * HAL context to be used to access SRNG APIs (currently used by data path
  * and transport (CE) modules)
@@ -523,6 +533,8 @@ struct hal_soc {
 
 	/* Indicate srngs initialization */
 	bool init_phase;
+	/* Hal level stats */
+	struct hal_soc_stats stats;
 };
 
 void hal_qca6750_attach(struct hal_soc *hal_soc);