[PATCH v2 3/3] Bluetooth: btintel_pcie: Reduce driver buffer posting to prevent race condition

[Kiran K <kiran.k@intel.com>]

From: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>

Modify the driver to post 3 fewer buffers than the maximum rx buffers
(64) allowed for the firmware. This change mitigates a hardware issue
causing a race condition in the firmware, improving stability and data
handling.

Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
---
changes from v1->v2:
- Add errata details

 drivers/bluetooth/btintel_pcie.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c
index 03f13de4a723..780697880d59 100644
--- a/drivers/bluetooth/btintel_pcie.c
+++ b/drivers/bluetooth/btintel_pcie.c
@@ -398,7 +398,12 @@ static int btintel_pcie_start_rx(struct btintel_pcie_data *data)
 	int i, ret;
 	struct rxq *rxq = &data->rxq;
 
-	for (i = 0; i < rxq->count; i++) {
+	/* WREQ-198603 - Post (BTINTEL_PCIE_RX_DESCS_COUNT - 3) buffers to
+	 * overcome the hardware issues leading to race condition at the
+	 * firmware.
+	 */
+
+	for (i = 0; i < rxq->count - 3; i++) {
 		ret = btintel_pcie_submit_rx(data);
 		if (ret)
 			return ret;
-- 
2.43.0