From: Michal Kazior <michal.kazior@tieto.com>
Date: Wed, 16 Oct 2013 13:46:24 +0000 (+0300)
Subject: ath10k: fix FW crashes on heavy TX on 10.1.389 AP FW
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=60f85bea25d5e9915da8b0c87275143b317cec3b;p=linux-beck.git

ath10k: fix FW crashes on heavy TX on 10.1.389 AP FW

10.1.389 firmware has some differences in
calculation of number of outstanding HTT TX
completions. This led to FW crashes of 10.1.389
while main firmware branch was unnaffected.

The patch makes sure ath10k doesn't queue up more
MSDUs than it should.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
---

diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index e46951b8fb92..d243f287fae7 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -1050,6 +1050,17 @@ struct ath10k_ce_pipe *ath10k_ce_init(struct ath10k *ar,
 	u32 ctrl_addr = ath10k_ce_base_address(ce_id);
 	int ret;
 
+	/*
+	 * Make sure there's enough CE ringbuffer entries for HTT TX to avoid
+	 * additional TX locking checks.
+	 *
+	 * For the lack of a better place do the check here.
+	 */
+	BUILD_BUG_ON(TARGET_NUM_MSDU_DESC >
+		     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
+	BUILD_BUG_ON(TARGET_10X_NUM_MSDU_DESC >
+		     (CE_HTT_H2T_MSG_SRC_NENTRIES - 1));
+
 	ret = ath10k_pci_wake(ar);
 	if (ret)
 		return NULL;
diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
index d9335e9d0d04..f1d36d2d2723 100644
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -85,16 +85,13 @@ void ath10k_htt_tx_free_msdu_id(struct ath10k_htt *htt, u16 msdu_id)
 
 int ath10k_htt_tx_attach(struct ath10k_htt *htt)
 {
-	u8 pipe;
-
 	spin_lock_init(&htt->tx_lock);
 	init_waitqueue_head(&htt->empty_tx_wq);
 
-	/* At the beginning free queue number should hint us the maximum
-	 * queue length */
-	pipe = htt->ar->htc.endpoint[htt->eid].ul_pipe_id;
-	htt->max_num_pending_tx = ath10k_hif_get_free_queue_number(htt->ar,
-								   pipe);
+	if (test_bit(ATH10K_FW_FEATURE_WMI_10X, htt->ar->fw_features))
+		htt->max_num_pending_tx = TARGET_10X_NUM_MSDU_DESC;
+	else
+		htt->max_num_pending_tx = TARGET_NUM_MSDU_DESC;
 
 	ath10k_dbg(ATH10K_DBG_BOOT, "htt tx max num pending tx %d\n",
 		   htt->max_num_pending_tx);