This is a note to let you know that I've just added the patch titled thermal/drivers/rcar_gen3_thermal: Fix coefficient calculations to the 5.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: thermal-drivers-rcar_gen3_thermal-fix-coefficient-ca.patch and it can be found in the queue-5.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 20e61ba708080a03c137b0603c8aa7072d865e6c Author: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> Date: Sat Jun 5 10:52:11 2021 +0200 thermal/drivers/rcar_gen3_thermal: Fix coefficient calculations [ Upstream commit 8946187ab57ffd02088e50256c73dd31f49db06d ] The fixed value of 157 used in the calculations are only correct for M3-W, on other Gen3 SoC it should be 167. The constant can be derived correctly from the static TJ_3 constant and the SoC specific TJ_1 value. Update the calculation be correct on all Gen3 SoCs. Fixes: 4eb39f79ef44 ("thermal: rcar_gen3_thermal: Update value of Tj_1") Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210605085211.564909-1-niklas.soderlund+renesas@xxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c index e1e412348076..1a60adb1d30a 100644 --- a/drivers/thermal/rcar_gen3_thermal.c +++ b/drivers/thermal/rcar_gen3_thermal.c @@ -143,7 +143,7 @@ static void rcar_gen3_thermal_calc_coefs(struct rcar_gen3_thermal_tsc *tsc, * Division is not scaled in BSP and if scaled it might overflow * the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled */ - tsc->tj_t = (FIXPT_INT((ptat[1] - ptat[2]) * 157) + tsc->tj_t = (FIXPT_INT((ptat[1] - ptat[2]) * (ths_tj_1 - TJ_3)) / (ptat[0] - ptat[2])) + FIXPT_INT(TJ_3); tsc->coef.a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),