wil6210: fix race in reset

It is important to halt USER CPU first, then MAC CPU
Otherwise, race happens in the firmware

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c
index 3704d2a..d734283 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/main.c
+++ b/drivers/net/wireless/ath/wil6210/main.c
@@ -327,6 +327,8 @@ static void wil_target_reset(struct wil6210_priv *wil)
        /* register clear = read, AND with inverted, write */
 #define C(a, v) W(a, R(a) & ~v)
 
+       wmb(); /* If host reorder writes here -> race in NIC */
+       W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
        wil->hw_version = R(RGF_USER_FW_REV_ID);
        rev_id = wil->hw_version & 0xff;
 
@@ -343,8 +345,9 @@ static void wil_target_reset(struct wil6210_priv *wil)
                wmb(); /* order is important here */
        }
 
-       W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
        W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
+       wmb(); /* If host reorder writes here -> race in NIC */
+       W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
        wmb(); /* order is important here */
 
        W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);