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From:   Miaoqing Pan <miaoqing@codeaurora.org>
To:     ath10k@lists.infradead.org
Cc:     linux-wireless@vger.kernel.org,
        Miaoqing Pan <miaoqing@codeaurora.org>
Subject: [PATCH] ath10k: fix PCIE device wake up failed
Date:   Thu, 30 May 2019 09:49:20 +0800
Message-Id: <1559180960-13565-1-git-send-email-miaoqing@codeaurora.org>
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

Observed PCIE device wake up failed after ~120 iterations of
soft-reboot test. The error message is
"ath10k_pci 0000:01:00.0: failed to wake up device : -110"

The call trace as below:
ath10k_pci_probe -> ath10k_pci_force_wake -> ath10k_pci_wake_wait ->
ath10k_pci_is_awake

Once trigger the device to wake up, we will continuously check the RTC
state until it returns RTC_STATE_V_ON or timeout.

But for QCA99x0 chips, we use wrong value for RTC_STATE_V_ON.
Occasionally, we get 0x7 on the fist read, we thought as a failure
case, but actually is the right value, also verified with the spec.
So fix the issue by changing RTC_STATE_V_ON from 0x5 to 0x7, passed
~2000 iterations.

Tested HW: QCA9984

Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/hw.c b/drivers/net/wireless/ath/ath10k/hw.c
index ad082b7..b242085 100644
--- a/drivers/net/wireless/ath/ath10k/hw.c
+++ b/drivers/net/wireless/ath/ath10k/hw.c
@@ -158,7 +158,7 @@
 };
 
 const struct ath10k_hw_values qca99x0_values = {
-	.rtc_state_val_on		= 5,
+	.rtc_state_val_on		= 7,
 	.ce_count			= 12,
 	.msi_assign_ce_max		= 12,
 	.num_target_ce_config_wlan	= 10,
-- 
1.9.1