[PATCH 3/8] ath11k: set WMI pipe credit to 1 for QCA6390

[Kalle Valo]

From: Carl Huang <cjhuang at codeaurora.org>

For QCA6390, set wmi credit to 1 to avoid back-to-back write to
shadow register when shadow register is enabled.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <cjhuang at codeaurora.org>
Signed-off-by: Kalle Valo <kvalo at codeaurora.org>
---
 drivers/net/wireless/ath/ath11k/htc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/ath/ath11k/htc.c b/drivers/net/wireless/ath/ath11k/htc.c
index 4de2350dfbf3..6b57dc273e0b 100644
--- a/drivers/net/wireless/ath/ath11k/htc.c
+++ b/drivers/net/wireless/ath/ath11k/htc.c
@@ -515,6 +515,12 @@ int ath11k_htc_wait_target(struct ath11k_htc *htc)
 		return -ECOMM;
 	}
 
+	/* For QCA6390, wmi endpoint uses 1 credit to avoid
+	 * back-to-back write.
+	 */
+	if (ab->hw_params.supports_shadow_regs)
+		htc->total_transmit_credits = 1;
+
 	ath11k_htc_setup_target_buffer_assignments(htc);
 
 	return 0;
-- 
2.7.4