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Wysocki" , Zhang Rui , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH v2 5/6] thermal/drivers/mediatek/lvts_thermal: Don't leave threshold zeroed Date: Wed, 3 May 2023 20:48:51 -0400 Message-Id: <20230504004852.627049-6-nfraprado@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230504004852.627049-1-nfraprado@collabora.com> References: <20230504004852.627049-1-nfraprado@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230503_174911_397125_1466D96A X-CRM114-Status: GOOD ( 13.27 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org The thermal framework might leave the low threshold unset if there aren't any lower trip points. This leaves the register zeroed, which translates to a very high temperature for the low threshold. The interrupt for this threshold is then immediately triggered, and the state machine gets stuck, preventing any other temperature monitoring interrupts to ever trigger. (The same happens by not setting the Cold or Hot to Normal thresholds when using those) Set the unused threshold to a valid low value. This value was chosen so that for any valid golden temperature read from the efuse, when the value is converted to raw and back again to milliCelsius, the result doesn't underflow. Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver") Signed-off-by: Nícolas F. R. A. Prado --- Changes in v2: - Added this commit drivers/thermal/mediatek/lvts_thermal.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c index efd1e938e1c2..951a4cb75ef6 100644 --- a/drivers/thermal/mediatek/lvts_thermal.c +++ b/drivers/thermal/mediatek/lvts_thermal.c @@ -82,6 +82,8 @@ #define LVTS_HW_SHUTDOWN_MT8195 105000 #define LVTS_HW_SHUTDOWN_MT8192 105000 +#define LVTS_MINIUM_THRESHOLD 20000 + static int golden_temp = LVTS_GOLDEN_TEMP_DEFAULT; static int coeff_b = LVTS_COEFF_B; @@ -309,6 +311,11 @@ static int lvts_set_trips(struct thermal_zone_device *tz, int low, int high) pr_debug("%s: Setting low limit temperature interrupt: %d\n", thermal_zone_device_type(tz), low); writel(raw_low, LVTS_OFFSETL(base)); + } else { + pr_debug("%s: Setting low limit temperature to minimum\n", + thermal_zone_device_type(tz)); + raw_low = lvts_temp_to_raw(LVTS_MINIUM_THRESHOLD); + writel(raw_low, LVTS_OFFSETL(base)); } /*