[PATCH ath-next v4 2/3] wifi: ath12k: Add support to clear qdesc array in REO cache

[Nithyanantham Paramasivam]

From: Balamurugan S <quic_bselvara at quicinc.com>

Currently, the existing code lacks functionality to clear the qdesc
array in the REO cache. As a result, any updates in the LUT are not
reflected in the REO cache. To address this issue, add functionality
to clear the qdesc array in the REO cache during a peer TID update.
To do this, set the CLEAR_DESC_ARRAY field of
WCSS_UMAC_REO_R0_QDESC_ADDR_READ and then reset it.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Balamurugan S <quic_bselvara at quicinc.com>
Signed-off-by: Nithyanantham Paramasivam <quic_nithp at quicinc.com>
---
 drivers/net/wireless/ath/ath12k/dp_rx.c  |  1 +
 drivers/net/wireless/ath/ath12k/hal.h    |  1 +
 drivers/net/wireless/ath/ath12k/hal_rx.c | 19 ++++++++++++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c
index 81e036f1d70f..48d907a400b3 100644
--- a/drivers/net/wireless/ath/ath12k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath12k/dp_rx.c
@@ -762,6 +762,7 @@ static void ath12k_peer_rx_tid_qref_setup(struct ath12k_base *ab, u16 peer_id, u
 	qref->info1 = u32_encode_bits(upper_32_bits(paddr),
 				      BUFFER_ADDR_INFO1_ADDR) |
 		      u32_encode_bits(tid, DP_REO_QREF_NUM);
+	ath12k_hal_reo_shared_qaddr_cache_clear(ab);
 }
 
 static void ath12k_peer_rx_tid_qref_reset(struct ath12k_base *ab, u16 peer_id, u16 tid)
diff --git a/drivers/net/wireless/ath/ath12k/hal.h b/drivers/net/wireless/ath/ath12k/hal.h
index 76bb095c62e6..339812d38338 100644
--- a/drivers/net/wireless/ath/ath12k/hal.h
+++ b/drivers/net/wireless/ath/ath12k/hal.h
@@ -1172,4 +1172,5 @@ int ath12k_hal_srng_update_shadow_config(struct ath12k_base *ab,
 void ath12k_hal_srng_shadow_config(struct ath12k_base *ab);
 void ath12k_hal_srng_shadow_update_hp_tp(struct ath12k_base *ab,
 					 struct hal_srng *srng);
+void ath12k_hal_reo_shared_qaddr_cache_clear(struct ath12k_base *ab);
 #endif
diff --git a/drivers/net/wireless/ath/ath12k/hal_rx.c b/drivers/net/wireless/ath/ath12k/hal_rx.c
index ac17d6223fa7..98eeccc68fcd 100644
--- a/drivers/net/wireless/ath/ath12k/hal_rx.c
+++ b/drivers/net/wireless/ath/ath12k/hal_rx.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BSD-3-Clause-Clear
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include "debug.h"
@@ -851,3 +851,20 @@ void ath12k_hal_reo_hw_setup(struct ath12k_base *ab, u32 ring_hash_map)
 	ath12k_hif_write32(ab, reo_base + HAL_REO1_DEST_RING_CTRL_IX_3,
 			   ring_hash_map);
 }
+
+void ath12k_hal_reo_shared_qaddr_cache_clear(struct ath12k_base *ab)
+{
+	u32 val;
+
+	lockdep_assert_held(&ab->base_lock);
+	val = ath12k_hif_read32(ab, HAL_SEQ_WCSS_UMAC_REO_REG +
+				HAL_REO1_QDESC_ADDR(ab));
+
+	val |= u32_encode_bits(1, HAL_REO_QDESC_ADDR_READ_CLEAR_QDESC_ARRAY);
+	ath12k_hif_write32(ab, HAL_SEQ_WCSS_UMAC_REO_REG +
+			   HAL_REO1_QDESC_ADDR(ab), val);
+
+	val &= ~HAL_REO_QDESC_ADDR_READ_CLEAR_QDESC_ARRAY;
+	ath12k_hif_write32(ab, HAL_SEQ_WCSS_UMAC_REO_REG +
+			   HAL_REO1_QDESC_ADDR(ab), val);
+}
-- 
2.17.1