linux-kernel - [PATCH AUTOSEL 6.13 03/35] wifi: rtw89: add crystal_cap check to avoid setting as overflow value

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Message-Id: <20250126150029.953021-3-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:59:57 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Chih-Kang Chang <gary.chang@...ltek.com>,
	Ping-Ke Shih <pkshih@...ltek.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.13 03/35] wifi: rtw89: add crystal_cap check to avoid setting as overflow value

From: Chih-Kang Chang <gary.chang@...ltek.com>

[ Upstream commit 7b98caea39676561f22db58752551161bb36462b ]

In the original flow, the crystal_cap might be calculated as a negative
value and set as an overflow value. Therefore, we added a check to limit
the calculated crystal_cap value. Additionally, we shrank the crystal_cap
adjustment according to specific CFO.

Signed-off-by: Chih-Kang Chang <gary.chang@...ltek.com>
Signed-off-by: Ping-Ke Shih <pkshih@...ltek.com>
Link: https://patch.msgid.link/20241128055433.11851-7-pkshih@realtek.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/realtek/rtw89/phy.c | 11 ++++++-----
 drivers/net/wireless/realtek/rtw89/phy.h |  2 +-
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/phy.c b/drivers/net/wireless/realtek/rtw89/phy.c
index f24aca663cf00..b9171f6ccae07 100644
--- a/drivers/net/wireless/realtek/rtw89/phy.c
+++ b/drivers/net/wireless/realtek/rtw89/phy.c
@@ -4058,7 +4058,6 @@ static void rtw89_phy_cfo_set_crystal_cap(struct rtw89_dev *rtwdev,
 
 	if (!force && cfo->crystal_cap == crystal_cap)
 		return;
-	crystal_cap = clamp_t(u8, crystal_cap, 0, 127);
 	if (chip->chip_id == RTL8852A || chip->chip_id == RTL8851B) {
 		rtw89_phy_cfo_set_xcap_reg(rtwdev, true, crystal_cap);
 		rtw89_phy_cfo_set_xcap_reg(rtwdev, false, crystal_cap);
@@ -4181,7 +4180,7 @@ static void rtw89_phy_cfo_crystal_cap_adjust(struct rtw89_dev *rtwdev,
 					     s32 curr_cfo)
 {
 	struct rtw89_cfo_tracking_info *cfo = &rtwdev->cfo_tracking;
-	s8 crystal_cap = cfo->crystal_cap;
+	int crystal_cap = cfo->crystal_cap;
 	s32 cfo_abs = abs(curr_cfo);
 	int sign;
 
@@ -4202,15 +4201,17 @@ static void rtw89_phy_cfo_crystal_cap_adjust(struct rtw89_dev *rtwdev,
 	}
 	sign = curr_cfo > 0 ? 1 : -1;
 	if (cfo_abs > CFO_TRK_STOP_TH_4)
-		crystal_cap += 7 * sign;
+		crystal_cap += 3 * sign;
 	else if (cfo_abs > CFO_TRK_STOP_TH_3)
-		crystal_cap += 5 * sign;
-	else if (cfo_abs > CFO_TRK_STOP_TH_2)
 		crystal_cap += 3 * sign;
+	else if (cfo_abs > CFO_TRK_STOP_TH_2)
+		crystal_cap += 1 * sign;
 	else if (cfo_abs > CFO_TRK_STOP_TH_1)
 		crystal_cap += 1 * sign;
 	else
 		return;
+
+	crystal_cap = clamp(crystal_cap, 0, 127);
 	rtw89_phy_cfo_set_crystal_cap(rtwdev, (u8)crystal_cap, false);
 	rtw89_debug(rtwdev, RTW89_DBG_CFO,
 		    "X_cap{Curr,Default}={0x%x,0x%x}\n",
diff --git a/drivers/net/wireless/realtek/rtw89/phy.h b/drivers/net/wireless/realtek/rtw89/phy.h
index c683f4d7d29b0..bc6912b3a2fba 100644
--- a/drivers/net/wireless/realtek/rtw89/phy.h
+++ b/drivers/net/wireless/realtek/rtw89/phy.h
@@ -57,7 +57,7 @@
 #define CFO_TRK_STOP_TH_4 (30 << 2)
 #define CFO_TRK_STOP_TH_3 (20 << 2)
 #define CFO_TRK_STOP_TH_2 (10 << 2)
-#define CFO_TRK_STOP_TH_1 (00 << 2)
+#define CFO_TRK_STOP_TH_1 (03 << 2)
 #define CFO_TRK_STOP_TH (2 << 2)
 #define CFO_SW_COMP_FINE_TUNE (2 << 2)
 #define CFO_PERIOD_CNT 15
-- 
2.39.5