ath10k: reduce dma burst size on newer firmware to fix crashes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 46900

package/kernel/mac80211/patches/332-ath10k-fix-DMA-related-firmware-crashes-on-multiple-.patch

+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 13 Sep 2015 22:26:10 +0200
+Subject: [PATCH] ath10k: fix DMA related firmware crashes on multiple devices
+
+Some platforms really don't like DMA bursts of 256 bytes, and this
+causes the firmware to crash when sending beacons.
+Also, changing this based on the firmware version does not seem to make
+much sense, so use 128 bytes for all versions.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/wireless/ath/ath10k/hw.h
++++ b/drivers/net/wireless/ath/ath10k/hw.h
+@@ -340,7 +340,7 @@ enum ath10k_hw_rate_cck {
+ #define TARGET_10X_MAX_FRAG_ENTRIES		0
+ 
+ /* 10.2 parameters */
+-#define TARGET_10_2_DMA_BURST_SIZE		1
++#define TARGET_10_2_DMA_BURST_SIZE		0
+ 
+ /* Target specific defines for WMI-TLV firmware */
+ #define TARGET_TLV_NUM_VDEVS			4
+@@ -397,7 +397,7 @@ enum ath10k_hw_rate_cck {
+ 
+ #define TARGET_10_4_TX_DBG_LOG_SIZE		1024
+ #define TARGET_10_4_NUM_WDS_ENTRIES		32
+-#define TARGET_10_4_DMA_BURST_SIZE		1
++#define TARGET_10_4_DMA_BURST_SIZE		0
+ #define TARGET_10_4_MAC_AGGR_DELIM		0
+ #define TARGET_10_4_RX_SKIP_DEFRAG_TIMEOUT_DUP_DETECTION_CHECK 1
+ #define TARGET_10_4_VOW_CONFIG			0