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From: Yoshihiro Kaneko <ykaneko0929@gmail.com>
To: linux-pm@vger.kernel.org
Cc: Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Simon Horman <horms@verge.net.au>,
	Magnus Damm <magnus.damm@gmail.com>,
	linux-renesas-soc@vger.kernel.org
Subject: [PATCH/RFT v3 2/3] thermal: rcar_gen3_thermal: Update calculation formula of IRQTEMP
Date: Tue, 14 May 2019 05:03:54 +0900	[thread overview]
Message-ID: <1557777835-19454-3-git-send-email-ykaneko0929@gmail.com> (raw)
In-Reply-To: <1557777835-19454-1-git-send-email-ykaneko0929@gmail.com>

Update the formula to calculate CTEMP:
Currently, the CTEMP is average of val1 (is calculated by
formula 1) and val2 (is calculated by formula 2). But,
as description in HWM (chapter 10A.3.1.1 Setting of Normal Mode)

If (STEMP < Tj_T) CTEMP value should be val1.
If (STEMP > Tj_T) CTEMP value should be val2.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
---
 drivers/thermal/rcar_gen3_thermal.c | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index 265ff6d..a2873e7 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -77,6 +77,7 @@ struct rcar_gen3_thermal_tsc {
 	struct equation_coefs coef;
 	int low;
 	int high;
+	int tj_t;
 };
 
 struct rcar_gen3_thermal_priv {
@@ -126,28 +127,26 @@ static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
 /* no idea where these constants come from */
 #define TJ_3 -41
 
-static void rcar_gen3_thermal_calc_coefs(struct equation_coefs *coef,
+static void rcar_gen3_thermal_calc_coefs(struct rcar_gen3_thermal_tsc *tsc,
 					 int *ptat, int *thcode,
 					 int ths_tj_1)
 {
-	int tj_2;
-
 	/* TODO: Find documentation and document constant calculation formula */
 
 	/*
 	 * Division is not scaled in BSP and if scaled it might overflow
 	 * the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
 	 */
-	tj_2 = (FIXPT_INT((ptat[1] - ptat[2]) * 157)
-		/ (ptat[0] - ptat[2])) + FIXPT_INT(TJ_3);
+	tsc->tj_t = (FIXPT_INT((ptat[1] - ptat[2]) * 157)
+		     / (ptat[0] - ptat[2])) + FIXPT_INT(TJ_3);
 
-	coef->a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
-			     tj_2 - FIXPT_INT(TJ_3));
-	coef->b1 = FIXPT_INT(thcode[2]) - coef->a1 * TJ_3;
+	tsc->coef.a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
+				 tsc->tj_t - FIXPT_INT(TJ_3));
+	tsc->coef.b1 = FIXPT_INT(thcode[2]) - tsc->coef.a1 * TJ_3;
 
-	coef->a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
-			     tj_2 - FIXPT_INT(ths_tj_1));
-	coef->b2 = FIXPT_INT(thcode[0]) - coef->a2 * ths_tj_1;
+	tsc->coef.a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
+				 tsc->tj_t - FIXPT_INT(ths_tj_1));
+	tsc->coef.b2 = FIXPT_INT(thcode[0]) - tsc->coef.a2 * ths_tj_1;
 }
 
 static int rcar_gen3_thermal_round(int temp)
@@ -186,13 +185,15 @@ static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
 static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
 					      int mcelsius)
 {
-	int celsius, val1, val2;
+	int celsius, val;
 
 	celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
-	val1 = celsius * tsc->coef.a1 + tsc->coef.b1;
-	val2 = celsius * tsc->coef.a2 + tsc->coef.b2;
+	if (celsius <= INT_FIXPT(tsc->tj_t))
+		val = celsius * tsc->coef.a1 + tsc->coef.b1;
+	else
+		val = celsius * tsc->coef.a2 + tsc->coef.b2;
 
-	return INT_FIXPT((val1 + val2) / 2);
+	return INT_FIXPT(val);
 }
 
 static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
@@ -440,7 +441,7 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 		priv->tscs[i] = tsc;
 
 		priv->thermal_init(tsc);
-		rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i],
+		rcar_gen3_thermal_calc_coefs(tsc, ptat, thcode[i],
 					     *rcar_gen3_ths_tj_1);
 
 		zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
-- 
1.9.1


  parent reply	other threads:[~2019-05-13 20:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-13 20:03 [PATCH/RFT v3 0/3] thermal: rcar_gen3_thermal: Update calculation formula due to HW evaluation Yoshihiro Kaneko
2019-05-13 20:03 ` [PATCH/RFT v3 1/3] thermal: rcar_gen3_thermal: Update value of Tj_1 Yoshihiro Kaneko
2019-05-13 20:03 ` Yoshihiro Kaneko [this message]
2019-05-13 20:03 ` [PATCH/RFT v3 3/3] thermal: rcar_gen3_thermal: Update temperature conversion method Yoshihiro Kaneko
2019-05-17 12:09 ` [PATCH/RFT v3 0/3] thermal: rcar_gen3_thermal: Update calculation formula due to HW evaluation Simon Horman

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