linux-kernel - [PATCH v2 4/6] thermal/drivers/mediatek/lvts

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Message-Id: <20230504004852.627049-5-nfraprado@collabora.com>
Date:   Wed,  3 May 2023 20:48:50 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     kernel@...labora.com, Alexandre Mergnat <amergnat@...libre.com>,
        Balsam CHIHI <bchihi@...libre.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Alexandre Bailon <abailon@...libre.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, Amit Kucheria <amitk@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: [PATCH v2 4/6] thermal/drivers/mediatek/lvts_thermal: Disable undesired interrupts

Out of the many interrupts supported by the hardware, the only ones of
interest to the driver currently are:
* The temperature went over the high offset threshold, for any of the
  sensors
* The temperature went below the low offset threshold, for any of the
  sensors
* The temperature went over the stage3 threshold

These are the only thresholds configured by the driver through the
OFFSETH, OFFSETL, and PROTTC registers, respectively.

The current interrupt mask in LVTS_MONINT_CONF, enables many more
interrupts, including data ready on sensors for both filtered and
immediate mode. These are not only not handled by the driver, but they
are also triggered too often, causing unneeded overhead. Disable these
unnecessary interrupts.

The meaning of each bit can be seen in the comment describing
LVTS_MONINTST in the IRQ handler.

Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

---

Changes in v2:
- Reworded commit and changed flag to use offset interrupts instead

 drivers/thermal/mediatek/lvts_thermal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index 8449ba6ca90e..efd1e938e1c2 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -63,7 +63,7 @@
 #define LVTS_HW_FILTER				0x2
 #define LVTS_TSSEL_CONF				0x13121110
 #define LVTS_CALSCALE_CONF			0x300
-#define LVTS_MONINT_CONF			0x9FBF7BDE
+#define LVTS_MONINT_CONF			0x8300318C
 
 #define LVTS_INT_SENSOR0			0x0009001F
 #define LVTS_INT_SENSOR1			0x001203E0
-- 
2.40.1