From: Niklas Söderlund Date: Wed, 29 Mar 2017 18:43:50 +0000 (+0200) Subject: thermal: rcar_gen3_thermal: add delay in .thermal_init on r8a7796 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=78aefd2d5911c4e0b5dc0b0578b3b8c7673be1d2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git thermal: rcar_gen3_thermal: add delay in .thermal_init on r8a7796 The .thermal_init needs to be delayed a short amount of time to allow for the TEMP register to contain something useful. If it's not delayed these warnings are common during boot: thermal thermal_zone0: failed to read out thermal zone (-5) thermal thermal_zone1: failed to read out thermal zone (-5) thermal thermal_zone2: failed to read out thermal zone (-5) The warnings are triggered by the first call to .get_temp() while the TEMP register contains 0 and rcar_gen3_thermal_get_temp() returns -EIO since a TEMP value of 0 will result in a temperature reading which is out of specifications. This should have been done in the initial commit which adds the driver as the same issue was found and corrected for r8a7795. Fixes: 564e73d283af9d4c ("thermal: rcar_gen3_thermal: Add R-Car Gen3 thermal driver") Signed-off-by: Niklas Söderlund Reviewed-by: Geert Uytterhoeven Reviewed-by: Wolfram Sang Signed-off-by: Eduardo Valentin --- diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c index d33c845244b1..ec477d47d0ba 100644 --- a/drivers/thermal/rcar_gen3_thermal.c +++ b/drivers/thermal/rcar_gen3_thermal.c @@ -222,6 +222,8 @@ static void r8a7796_thermal_init(struct rcar_gen3_thermal_tsc *tsc) reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR); reg_val |= THCTR_THSST; rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val); + + usleep_range(1000, 2000); } static const struct rcar_gen3_thermal_data r8a7795_data = {