[PATCH 0/3] Correct R-Car Gen2 critical CPU temperature

[PATCH 0/3] Correct R-Car Gen2 critical CPU temperature

[Chris Paterson]

The current R-Car Gen2 device trees define the CPU critical
temperature as 115°C.

The R-Car hardware manuals state that Tc = –40°C to +105°C. The
thermal sensor has an accuracy of ±5°C and there can be a temperature
difference of 1 or 2 degrees between Tjmax and the thermal sensor due
to the location of the latter.

This means that 95°C is a safer value to use.

This value should also apply to r8a7792 but thermal sensor support has
not been added yet.

Chris Paterson (3):
  ARM: dts: r8a7790: Correct critical CPU temperature
  ARM: dts: r8a7791: Correct critical CPU temperature
  ARM: dts: r8a7793: Correct critical CPU temperature

 arch/arm/boot/dts/r8a7790.dtsi | 2 +-
 arch/arm/boot/dts/r8a7791.dtsi | 2 +-
 arch/arm/boot/dts/r8a7793.dtsi | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

-- 
1.9.1

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[PATCH 1/3] ARM: dts: r8a7790: Correct critical CPU temperature

[Chris Paterson]

The R-Car H2 hardware manual states that Tc = –40°C to +105°C. The
thermal sensor has an accuracy of ±5°C and there can be a temperature
difference of 1 or 2 degrees between Tjmax and the thermal sensor due
to the location of the latter.

This means that 95°C is a safer value to use.

Fixes: a8b805f3606f7af7 ("ARM: dts: r8a7790: enable to use thermal-zone")
Signed-off-by: Chris Paterson <chris.paterson2-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
---
 arch/arm/boot/dts/r8a7790.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
index 450bfc0e9796a557..ed9a68538a554001 100644
--- a/arch/arm/boot/dts/r8a7790.dtsi
+++ b/arch/arm/boot/dts/r8a7790.dtsi
@@ -168,7 +168,7 @@
 
 			trips {
 				cpu-crit {
-					temperature	= <115000>;
+					temperature	= <95000>;
 					hysteresis	= <0>;
 					type		= "critical";
 				};
-- 
1.9.1

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Re: [PATCH 1/3] ARM: dts: r8a7790: Correct critical CPU temperature

[Geert Uytterhoeven]

On Thu, Dec 14, 2017 at 10:08 AM, Chris Paterson
<chris.paterson2@renesas.com> wrote:
> The R-Car H2 hardware manual states that Tc = –40°C to +105°C. The
> thermal sensor has an accuracy of ±5°C and there can be a temperature
> difference of 1 or 2 degrees between Tjmax and the thermal sensor due
> to the location of the latter.
>
> This means that 95°C is a safer value to use.
>
> Fixes: a8b805f3606f7af7 ("ARM: dts: r8a7790: enable to use thermal-zone")
> Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH 2/3] ARM: dts: r8a7791: Correct critical CPU temperature

[Chris Paterson]

The R-Car M2W hardware manual states that Tc = –40°C to +105°C. The
thermal sensor has an accuracy of ±5°C and there can be a temperature
difference of 1 or 2 degrees between Tjmax and the thermal sensor due
to the location of the latter.

This means that 95°C is a safer value to use.

Fixes: cac68a56e34b9810 ("ARM: dts: r8a7791: enable to use thermal-zone")
Signed-off-by: Chris Paterson <chris.paterson2-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
---
 arch/arm/boot/dts/r8a7791.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi
index dfc1c406179fbf3a..008a260f86a565c6 100644
--- a/arch/arm/boot/dts/r8a7791.dtsi
+++ b/arch/arm/boot/dts/r8a7791.dtsi
@@ -92,7 +92,7 @@
 
 			trips {
 				cpu-crit {
-					temperature	= <115000>;
+					temperature	= <95000>;
 					hysteresis	= <0>;
 					type		= "critical";
 				};
-- 
1.9.1

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Re: [PATCH 2/3] ARM: dts: r8a7791: Correct critical CPU temperature

[Geert Uytterhoeven]

On Thu, Dec 14, 2017 at 10:08 AM, Chris Paterson
<chris.paterson2@renesas.com> wrote:
> The R-Car M2W hardware manual states that Tc = –40°C to +105°C. The

M2-W

> thermal sensor has an accuracy of ±5°C and there can be a temperature
> difference of 1 or 2 degrees between Tjmax and the thermal sensor due
> to the location of the latter.
>
> This means that 95°C is a safer value to use.
>
> Fixes: cac68a56e34b9810 ("ARM: dts: r8a7791: enable to use thermal-zone")
> Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH 3/3] ARM: dts: r8a7793: Correct critical CPU temperature

[Chris Paterson]

The R-Car M2N hardware manual states that Tc = –40°C to +105°C. The
thermal sensor has an accuracy of ±5°C and there can be a temperature
difference of 1 or 2 degrees between Tjmax and the thermal sensor due
to the location of the latter.

This means that 95°C is a safer value to use.

Fixes: 57f9156bc620ac56 ("ARM: dts: r8a7793: enable to use thermal-zone")
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
---
 arch/arm/boot/dts/r8a7793.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index 61dd291d907da2f5..039b225175262e4b 100644
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -89,7 +89,7 @@
 
 			trips {
 				cpu-crit {
-					temperature	= <115000>;
+					temperature	= <95000>;
 					hysteresis	= <0>;
 					type		= "critical";
 				};
-- 
1.9.1

Re: [PATCH 3/3] ARM: dts: r8a7793: Correct critical CPU temperature

[Geert Uytterhoeven]

On Thu, Dec 14, 2017 at 10:08 AM, Chris Paterson
<chris.paterson2@renesas.com> wrote:
> The R-Car M2N hardware manual states that Tc = –40°C to +105°C. The

M2-N

> thermal sensor has an accuracy of ±5°C and there can be a temperature
> difference of 1 or 2 degrees between Tjmax and the thermal sensor due
> to the location of the latter.
>
> This means that 95°C is a safer value to use.
>
> Fixes: 57f9156bc620ac56 ("ARM: dts: r8a7793: enable to use thermal-zone")
> Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds