linux-kernel - [PATCH v3 5/9] thermal/drivers/mediatek/lvts: Add lvts_temp_to

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Message-Id: <20250804133035.309990-6-laura.nao@collabora.com>
Date: Mon,  4 Aug 2025 15:30:31 +0200
From: Laura Nao <laura.nao@...labora.com>
To: srini@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	rafael@...nel.org,
	daniel.lezcano@...aro.org,
	rui.zhang@...el.com,
	lukasz.luba@....com,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com
Cc: nfraprado@...labora.com,
	arnd@...db.de,
	colin.i.king@...il.com,
	u.kleine-koenig@...libre.com,
	andrew-ct.chen@...iatek.com,
	lala.lin@...iatek.com,
	bchihi@...libre.com,
	frank-w@...lic-files.de,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	kernel@...labora.com,
	Laura Nao <laura.nao@...labora.com>,
	Chen-Yu Tsai <wenst@...omium.org>,
	Fei Shao <fshao@...omium.org>
Subject: [PATCH v3 5/9] thermal/drivers/mediatek/lvts: Add lvts_temp_to_raw variant

MT8196/MT6991 require a different version of lvts_temp_to_raw(),
specifically the multiplicative inverse of the existing implementation.
Introduce a variant of the function with inverted calculation logic to
match this requirement.

This ensures accurate raw value generation for temperature
thresholds, avoiding spurious thermal interrupts or unintended hardware
resets on MT8196/MT6991.

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Fei Shao <fshao@...omium.org>
Signed-off-by: Laura Nao <laura.nao@...labora.com>
---
 drivers/thermal/mediatek/lvts_thermal.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index 47124d33ca2e..e29664f1316a 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -300,6 +300,18 @@ static u32 lvts_temp_to_raw(int temperature, int temp_factor)
 	return div_s64(raw_temp, -temp_factor);
 }
 
+static u32 lvts_temp_to_raw_v2(int temperature, int temp_factor)
+{
+	u32 raw_temp;
+
+	if (temp_factor == 0)
+		return temperature;
+
+	raw_temp = temperature - golden_temp_offset;
+
+	return div_s64((s64)temp_factor << 14, raw_temp);
+}
+
 static int lvts_get_temp(struct thermal_zone_device *tz, int *temp)
 {
 	struct lvts_sensor *lvts_sensor = thermal_zone_device_priv(tz);
-- 
2.39.5