[PATCH RFT v2 0/3] drivers/thermal/rcar_gen3_thermal: add Gen4 fuse support

[PATCH RFT v2 0/3] drivers/thermal/rcar_gen3_thermal: add Gen4 fuse support

[Wolfram Sang]

R-Car Gen4 has the fuse registers at different locations and with
different names, but with the same purpose. So, first refactor IP core
differences into a 'info' struct, then add the fuse_read callback to it.

Changes since RFT v1:
* Patches are rebased on top of thermal-next as of today.
* Added tags from Niklas (thanks!)

They have been tested on R-Car H3 ES2.0 and M3-N against regressions.
Actual testing of the new fuses on Gen4 still needs to be done because I
don't have access to such HW.

@Shimoda-san: maybe the BSP team or Test team can test these patches?
A branch for testing can be found here:
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/for-thermal

Looking forward to other review comments, too, of course.

Happy hacking,

   Wolfram

Wolfram Sang (3):
  drivers/thermal/rcar_gen3_thermal: introduce 'info' structure
  drivers/thermal/rcar_gen3_thermal: refactor reading fuses into
    seprarate function
  drivers/thermal/rcar_gen3_thermal: add reading fuses for Gen4

 drivers/thermal/rcar_gen3_thermal.c | 141 ++++++++++++++++++++--------
 1 file changed, 102 insertions(+), 39 deletions(-)

-- 
2.30.2

[PATCH RFT v2 1/3] drivers/thermal/rcar_gen3_thermal: introduce 'info' structure

[Wolfram Sang]

More items to describe the TSCs are needed soon, so encapsulate the
current 'ths_tj_1' item into a struct.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/thermal/rcar_gen3_thermal.c | 41 ++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index 42a4724d3920..e9b0aa0a2016 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -66,6 +66,10 @@ struct equation_coefs {
 	int b2;
 };
 
+struct rcar_thermal_info {
+	int ths_tj_1;
+};
+
 struct rcar_gen3_thermal_tsc {
 	void __iomem *base;
 	struct thermal_zone_device *zone;
@@ -79,6 +83,7 @@ struct rcar_gen3_thermal_priv {
 	struct thermal_zone_device_ops ops;
 	unsigned int num_tscs;
 	int ptat[3];
+	const struct rcar_thermal_info *info;
 };
 
 static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
@@ -318,52 +323,58 @@ static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_priv *priv,
 	usleep_range(1000, 2000);
 }
 
-static const int rcar_gen3_ths_tj_1 = 126;
-static const int rcar_gen3_ths_tj_1_m3_w = 116;
+static const struct rcar_thermal_info rcar_m3w_thermal_info = {
+	.ths_tj_1 = 116,
+};
+
+static const struct rcar_thermal_info rcar_gen3_thermal_info = {
+	.ths_tj_1 = 126,
+};
+
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
 	{
 		.compatible = "renesas,r8a774a1-thermal",
-		.data = &rcar_gen3_ths_tj_1_m3_w,
+		.data = &rcar_m3w_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a774b1-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a774e1-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a7795-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a7796-thermal",
-		.data = &rcar_gen3_ths_tj_1_m3_w,
+		.data = &rcar_m3w_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a77961-thermal",
-		.data = &rcar_gen3_ths_tj_1_m3_w,
+		.data = &rcar_m3w_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a77965-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a77980-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a779a0-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a779f0-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a779g0-thermal",
-		.data = &rcar_gen3_ths_tj_1,
+		.data = &rcar_gen3_thermal_info,
 	},
 	{},
 };
@@ -418,7 +429,6 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 {
 	struct rcar_gen3_thermal_priv *priv;
 	struct device *dev = &pdev->dev;
-	const int *ths_tj_1 = of_device_get_match_data(dev);
 	struct resource *res;
 	struct thermal_zone_device *zone;
 	unsigned int i;
@@ -430,6 +440,7 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 
 	priv->ops = rcar_gen3_tz_of_ops;
 
+	priv->info = of_device_get_match_data(dev);
 	platform_set_drvdata(pdev, priv);
 
 	if (rcar_gen3_thermal_request_irqs(priv, pdev))
@@ -469,7 +480,7 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
 
 		rcar_gen3_thermal_init(priv, tsc);
-		rcar_gen3_thermal_calc_coefs(priv, tsc, *ths_tj_1);
+		rcar_gen3_thermal_calc_coefs(priv, tsc, priv->info->ths_tj_1);
 
 		zone = devm_thermal_of_zone_register(dev, i, tsc, &priv->ops);
 		if (IS_ERR(zone)) {
-- 
2.30.2

[PATCH RFT v2 2/3] drivers/thermal/rcar_gen3_thermal: refactor reading fuses into seprarate function

[Wolfram Sang]

Gen4 will be very different, so refactor Gen3 access into separate call
first.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/thermal/rcar_gen3_thermal.c | 60 +++++++++++++++++------------
 1 file changed, 36 insertions(+), 24 deletions(-)

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index e9b0aa0a2016..39b382ee08c8 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -66,8 +66,11 @@ struct equation_coefs {
 	int b2;
 };
 
+struct rcar_gen3_thermal_priv;
+
 struct rcar_thermal_info {
 	int ths_tj_1;
+	void (*read_fuses)(struct rcar_gen3_thermal_priv *priv);
 };
 
 struct rcar_gen3_thermal_tsc {
@@ -241,6 +244,34 @@ static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static void rcar_gen3_thermal_read_fuses_gen3(struct rcar_gen3_thermal_priv *priv)
+{
+	unsigned int i;
+
+	/*
+	 * Set the pseudo calibration points with fused values.
+	 * PTAT is shared between all TSCs but only fused for the first
+	 * TSC while THCODEs are fused for each TSC.
+	 */
+	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
+		GEN3_FUSE_MASK;
+	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
+		GEN3_FUSE_MASK;
+	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
+		GEN3_FUSE_MASK;
+
+	for (i = 0; i < priv->num_tscs; i++) {
+		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
+
+		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
+			GEN3_FUSE_MASK;
+		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
+			GEN3_FUSE_MASK;
+		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
+			GEN3_FUSE_MASK;
+	}
+}
+
 static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 {
 	unsigned int i;
@@ -248,7 +279,8 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 
 	/* If fuses are not set, fallback to pseudo values. */
 	thscp = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_THSCP);
-	if ((thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
+	if (!priv->info->read_fuses ||
+	    (thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
 		/* Default THCODE values in case FUSEs are not set. */
 		static const int thcodes[TSC_MAX_NUM][3] = {
 			{ 3397, 2800, 2221 },
@@ -273,29 +305,7 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 		return false;
 	}
 
-	/*
-	 * Set the pseudo calibration points with fused values.
-	 * PTAT is shared between all TSCs but only fused for the first
-	 * TSC while THCODEs are fused for each TSC.
-	 */
-	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
-		GEN3_FUSE_MASK;
-	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
-		GEN3_FUSE_MASK;
-	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
-		GEN3_FUSE_MASK;
-
-	for (i = 0; i < priv->num_tscs; i++) {
-		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
-
-		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
-			GEN3_FUSE_MASK;
-	}
-
+	priv->info->read_fuses(priv);
 	return true;
 }
 
@@ -325,10 +335,12 @@ static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_priv *priv,
 
 static const struct rcar_thermal_info rcar_m3w_thermal_info = {
 	.ths_tj_1 = 116,
+	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen3_thermal_info = {
 	.ths_tj_1 = 126,
+	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
 };
 
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
-- 
2.30.2

[PATCH RFT v2 3/3] drivers/thermal/rcar_gen3_thermal: add reading fuses for Gen4

[Wolfram Sang]

The registers are differently named and at different offsets, but their
functionality is the same as for Gen3.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/thermal/rcar_gen3_thermal.c | 44 +++++++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index 39b382ee08c8..e01e27903e44 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -35,6 +35,12 @@
 #define REG_GEN3_PTAT2		0x60
 #define REG_GEN3_PTAT3		0x64
 #define REG_GEN3_THSCP		0x68
+#define REG_GEN4_THSFMON00	0x180
+#define REG_GEN4_THSFMON01	0x184
+#define REG_GEN4_THSFMON02	0x188
+#define REG_GEN4_THSFMON15	0x1BC
+#define REG_GEN4_THSFMON16	0x1C0
+#define REG_GEN4_THSFMON17	0x1C4
 
 /* IRQ{STR,MSK,EN} bits */
 #define IRQ_TEMP1		BIT(0)
@@ -55,6 +61,7 @@
 
 #define MCELSIUS(temp)	((temp) * 1000)
 #define GEN3_FUSE_MASK	0xFFF
+#define GEN4_FUSE_MASK	0xFFF
 
 #define TSC_MAX_NUM	5
 
@@ -272,6 +279,34 @@ static void rcar_gen3_thermal_read_fuses_gen3(struct rcar_gen3_thermal_priv *pri
 	}
 }
 
+static void rcar_gen3_thermal_read_fuses_gen4(struct rcar_gen3_thermal_priv *priv)
+{
+	unsigned int i;
+
+	/*
+	 * Set the pseudo calibration points with fused values.
+	 * PTAT is shared between all TSCs but only fused for the first
+	 * TSC while THCODEs are fused for each TSC.
+	 */
+	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON01) &
+		GEN4_FUSE_MASK;
+	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON02) &
+		GEN4_FUSE_MASK;
+	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON00) &
+		GEN4_FUSE_MASK;
+
+	for (i = 0; i < priv->num_tscs; i++) {
+		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
+
+		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON16) &
+			GEN4_FUSE_MASK;
+		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON17) &
+			GEN4_FUSE_MASK;
+		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON15) &
+			GEN4_FUSE_MASK;
+	}
+}
+
 static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 {
 	unsigned int i;
@@ -343,6 +378,11 @@ static const struct rcar_thermal_info rcar_gen3_thermal_info = {
 	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
 };
 
+static const struct rcar_thermal_info rcar_gen4_thermal_info = {
+	.ths_tj_1 = 126,
+	.read_fuses = rcar_gen3_thermal_read_fuses_gen4,
+};
+
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
 	{
 		.compatible = "renesas,r8a774a1-thermal",
@@ -382,11 +422,11 @@ static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
 	},
 	{
 		.compatible = "renesas,r8a779f0-thermal",
-		.data = &rcar_gen3_thermal_info,
+		.data = &rcar_gen4_thermal_info,
 	},
 	{
 		.compatible = "renesas,r8a779g0-thermal",
-		.data = &rcar_gen3_thermal_info,
+		.data = &rcar_gen4_thermal_info,
 	},
 	{},
 };
-- 
2.30.2

RE: [PATCH RFT v2 3/3] drivers/thermal/rcar_gen3_thermal: add reading fuses for Gen4

[Yoshihiro Shimoda]

Hello Wolfram-san,

> From: Wolfram Sang, Sent: Thursday, April 20, 2023 6:21 PM
> 
> The registers are differently named and at different offsets, but their
> functionality is the same as for Gen3.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Thank you for the patch!

> ---
>  drivers/thermal/rcar_gen3_thermal.c | 44 +++++++++++++++++++++++++++--
>  1 file changed, 42 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
> index 39b382ee08c8..e01e27903e44 100644
> --- a/drivers/thermal/rcar_gen3_thermal.c
> +++ b/drivers/thermal/rcar_gen3_thermal.c
> @@ -35,6 +35,12 @@
>  #define REG_GEN3_PTAT2		0x60
>  #define REG_GEN3_PTAT3		0x64
>  #define REG_GEN3_THSCP		0x68
> +#define REG_GEN4_THSFMON00	0x180
> +#define REG_GEN4_THSFMON01	0x184
> +#define REG_GEN4_THSFMON02	0x188
> +#define REG_GEN4_THSFMON15	0x1BC
> +#define REG_GEN4_THSFMON16	0x1C0
> +#define REG_GEN4_THSFMON17	0x1C4
> 
>  /* IRQ{STR,MSK,EN} bits */
>  #define IRQ_TEMP1		BIT(0)
> @@ -55,6 +61,7 @@
> 
>  #define MCELSIUS(temp)	((temp) * 1000)
>  #define GEN3_FUSE_MASK	0xFFF
> +#define GEN4_FUSE_MASK	0xFFF
> 
>  #define TSC_MAX_NUM	5
> 
> @@ -272,6 +279,34 @@ static void rcar_gen3_thermal_read_fuses_gen3(struct rcar_gen3_thermal_priv *pri
>  	}
>  }
> 
> +static void rcar_gen3_thermal_read_fuses_gen4(struct rcar_gen3_thermal_priv *priv)
> +{
> +	unsigned int i;
> +
> +	/*
> +	 * Set the pseudo calibration points with fused values.
> +	 * PTAT is shared between all TSCs but only fused for the first
> +	 * TSC while THCODEs are fused for each TSC.
> +	 */
> +	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON01) &
> +		GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON01/REG_GEN4_THSFMON16/

According to the table in 13.3.3.4 of R-Car {S4,V4H} Hardware manuals:

PTAT1	PTAT_PF_U_SR1 bits (of THSFMON16 register)
PTAT2	PTAT_PF_R_SR1 bits (of THSFMON17 register)
PTAT3	PTAT_PF_L_SR1 bits (of THSFMON15 register)
THCODE1	THCODE_U_SR1 bits (of THSFMON01 register)
THCODE2	THCODE_R_SR1 bits (of THSFMON02 register)
THCODE3	THCODE_L_SR1 bits (of THSFMON00 register)

Otherwise, calculated the temperature value was incorrect.

> +	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON02) &
> +		GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON02/THSFMON17/

> +	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON00) &
> +		GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON00/THSFMON15/

> +
> +	for (i = 0; i < priv->num_tscs; i++) {
> +		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
> +
> +		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON16) &
> +			GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON16/THSFMON01/

> +		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON17) &
> +			GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON17/THSFMON02/

> +		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN4_THSFMON15) &
> +			GEN4_FUSE_MASK;

s/REG_GEN4_THSFMON15/THSFMON00/

Best regards,
Yoshihiro Shimoda

> +	}
> +}
> +
>  static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
>  {
>  	unsigned int i;
> @@ -343,6 +378,11 @@ static const struct rcar_thermal_info rcar_gen3_thermal_info = {
>  	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
>  };
> 
> +static const struct rcar_thermal_info rcar_gen4_thermal_info = {
> +	.ths_tj_1 = 126,
> +	.read_fuses = rcar_gen3_thermal_read_fuses_gen4,
> +};
> +
>  static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
>  	{
>  		.compatible = "renesas,r8a774a1-thermal",
> @@ -382,11 +422,11 @@ static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
>  	},
>  	{
>  		.compatible = "renesas,r8a779f0-thermal",
> -		.data = &rcar_gen3_thermal_info,
> +		.data = &rcar_gen4_thermal_info,
>  	},
>  	{
>  		.compatible = "renesas,r8a779g0-thermal",
> -		.data = &rcar_gen3_thermal_info,
> +		.data = &rcar_gen4_thermal_info,
>  	},
>  	{},
>  };
> --
> 2.30.2

Re: [PATCH RFT v2 3/3] drivers/thermal/rcar_gen3_thermal: add reading fuses for Gen4

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 645 bytes --]


> > +	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN4_THSFMON01) &
> > +		GEN4_FUSE_MASK;
> 
> s/REG_GEN4_THSFMON01/REG_GEN4_THSFMON16/
> 
> According to the table in 13.3.3.4 of R-Car {S4,V4H} Hardware manuals:
> 
> PTAT1	PTAT_PF_U_SR1 bits (of THSFMON16 register)
> PTAT2	PTAT_PF_R_SR1 bits (of THSFMON17 register)
> PTAT3	PTAT_PF_L_SR1 bits (of THSFMON15 register)
> THCODE1	THCODE_U_SR1 bits (of THSFMON01 register)
> THCODE2	THCODE_R_SR1 bits (of THSFMON02 register)
> THCODE3	THCODE_L_SR1 bits (of THSFMON00 register)

Oops, you are right, I mixed the two blocks :/ I'll send a fixed version
right away!


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