linux-kernel - [PATCH] rtw88: Add delay on polling h2c command status bit

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Message-Id: <20200406093623.3980-1-kai.heng.feng@canonical.com>
Date:   Mon,  6 Apr 2020 17:36:22 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     yhchuang@...ltek.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org (open list:REALTEK WIRELESS DRIVER
        (rtw88)), netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] rtw88: Add delay on polling h2c command status bit

On some systems we can constanly see rtw88 complains:
[39584.721375] rtw_pci 0000:03:00.0: failed to send h2c command

Increase interval of each check to wait the status bit really changes.

While at it, add some helpers so we can use standarized
readx_poll_timeout() macro.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/net/wireless/realtek/rtw88/fw.c  | 12 ++++++------
 drivers/net/wireless/realtek/rtw88/hci.h |  4 ++++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/fw.c b/drivers/net/wireless/realtek/rtw88/fw.c
index 05c430b3489c..bc9982e77524 100644
--- a/drivers/net/wireless/realtek/rtw88/fw.c
+++ b/drivers/net/wireless/realtek/rtw88/fw.c
@@ -2,6 +2,8 @@
 /* Copyright(c) 2018-2019  Realtek Corporation
  */
 
+#include <linux/iopoll.h>
+
 #include "main.h"
 #include "coex.h"
 #include "fw.h"
@@ -193,8 +195,8 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 	u8 box;
 	u8 box_state;
 	u32 box_reg, box_ex_reg;
-	u32 h2c_wait;
 	int idx;
+	int ret;
 
 	rtw_dbg(rtwdev, RTW_DBG_FW,
 		"send H2C content %02x%02x%02x%02x %02x%02x%02x%02x\n",
@@ -226,12 +228,10 @@ static void rtw_fw_send_h2c_command(struct rtw_dev *rtwdev,
 		goto out;
 	}
 
-	h2c_wait = 20;
-	do {
-		box_state = rtw_read8(rtwdev, REG_HMETFR);
-	} while ((box_state >> box) & 0x1 && --h2c_wait > 0);
+	ret = readx_poll_timeout(rr8, REG_HMETFR, box_state,
+				 !((box_state >> box) & 0x1), 100, 3000);
 
-	if (!h2c_wait) {
+	if (ret) {
 		rtw_err(rtwdev, "failed to send h2c command\n");
 		goto out;
 	}
diff --git a/drivers/net/wireless/realtek/rtw88/hci.h b/drivers/net/wireless/realtek/rtw88/hci.h
index 2cba327e6218..24062c7079c6 100644
--- a/drivers/net/wireless/realtek/rtw88/hci.h
+++ b/drivers/net/wireless/realtek/rtw88/hci.h
@@ -253,6 +253,10 @@ rtw_write8_mask(struct rtw_dev *rtwdev, u32 addr, u32 mask, u8 data)
 	rtw_write8(rtwdev, addr, set);
 }
 
+#define rr8(addr)      rtw_read8(rtwdev, addr)
+#define rr16(addr)     rtw_read16(rtwdev, addr)
+#define rr32(addr)     rtw_read32(rtwdev, addr)
+
 static inline enum rtw_hci_type rtw_hci_type(struct rtw_dev *rtwdev)
 {
 	return rtwdev->hci.type;
-- 
2.17.1