[v4,4/5] rockchip: Separate the reset cause from display cpuinfo
diff mbox series

Message ID 20200618153948.218506-5-jagan@amarulasolutions.com
State New
Headers show
Series
  • roc-rk3399-pc: Custom SPL init
Related show

Commit Message

Jagan Teki June 18, 2020, 3:39 p.m. UTC 
reset cause is a generic functionality based on the soc
cru registers in rockchip. This can be used for printing
the cause of reset in cpuinfo or some other place where
reset cause is needed. 

Other than cpuinfo, reset cause can also be using during
bootcount for checking the specific reset cause and glow
the led based on the reset cause.

So, let's separate the reset cause code from cpuinfo, and
add a check to build it for rk3399, rk3288 since these two
soc are supporting reset cause as of now.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Suniel Mahesh <sunil@amarulasolutions.com>
---
Changes for v4:
- none

 arch/arm/include/asm/arch-rockchip/cru.h |  2 ++
 arch/arm/mach-rockchip/Makefile          |  5 ++++-
 arch/arm/mach-rockchip/cpu-info.c        | 20 ++++++++++++--------
 3 files changed, 18 insertions(+), 9 deletions(-)

Comments

Kever Yang June 28, 2020, 2:46 a.m. UTC | #1 
HI Jagan,

On 2020/6/18 下午11:39, Jagan Teki wrote:
> reset cause is a generic functionality based on the soc
> cru registers in rockchip. This can be used for printing
> the cause of reset in cpuinfo or some other place where
> reset cause is needed.
>
> Other than cpuinfo, reset cause can also be using during
> bootcount for checking the specific reset cause and glow
> the led based on the reset cause.
>
> So, let's separate the reset cause code from cpuinfo, and
> add a check to build it for rk3399, rk3288 since these two
> soc are supporting reset cause as of now.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> Tested-by: Suniel Mahesh <sunil@amarulasolutions.com>
> ---
> Changes for v4:
> - none
>
>   arch/arm/include/asm/arch-rockchip/cru.h |  2 ++
>   arch/arm/mach-rockchip/Makefile          |  5 ++++-
>   arch/arm/mach-rockchip/cpu-info.c        | 20 ++++++++++++--------
>   3 files changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/arch/arm/include/asm/arch-rockchip/cru.h b/arch/arm/include/asm/arch-rockchip/cru.h
> index 5eb17f9d55..317eb61049 100644
> --- a/arch/arm/include/asm/arch-rockchip/cru.h
> +++ b/arch/arm/include/asm/arch-rockchip/cru.h
> @@ -31,4 +31,6 @@ enum {
>   
>   #define MHz		1000000
>   
> +char *get_reset_cause(void);

Since you add a environment, you should use that instead of export 
get_reset_cause().


> +
>   #endif /* _ROCKCHIP_CLOCK_H */
> diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
> index 5b38526fe0..ef4898e00c 100644
> --- a/arch/arm/mach-rockchip/Makefile
> +++ b/arch/arm/mach-rockchip/Makefile
> @@ -15,6 +15,10 @@ obj-tpl-$(CONFIG_ROCKCHIP_PX30) += px30-board-tpl.o
>   
>   obj-spl-$(CONFIG_ROCKCHIP_RK3036) += rk3036-board-spl.o
>   
> +ifeq ($(CONFIG_ROCKCHIP_RK3288)$(CONFIG_ROCKCHIP_RK3399), y)
> +obj-y += cpu-info.o
> +endif

This change is not need, if the soc does not support this feature, they 
should not enable

CONFIG_DISPLAY_CPUINFO.

Thanks,
- Kever

> +
>   ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
>   
>   # Always include boot_mode.o, as we bypass it (i.e. turn it off)
> @@ -22,7 +26,6 @@ ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
>   # we can have the preprocessor correctly recognise both 0x0 and 0
>   # meaning "turn it off".
>   obj-y += boot_mode.o
> -obj-$(CONFIG_DISPLAY_CPUINFO) += cpu-info.o
>   obj-$(CONFIG_ROCKCHIP_COMMON_BOARD) += board.o
>   obj-$(CONFIG_MISC_INIT_R) += misc.o
>   endif
> diff --git a/arch/arm/mach-rockchip/cpu-info.c b/arch/arm/mach-rockchip/cpu-info.c
> index 21ca9dedce..76a840e2c3 100644
> --- a/arch/arm/mach-rockchip/cpu-info.c
> +++ b/arch/arm/mach-rockchip/cpu-info.c
> @@ -13,7 +13,7 @@
>   #include <asm/arch-rockchip/hardware.h>
>   #include <linux/err.h>
>   
> -static char *get_reset_cause(void)
> +char *get_reset_cause(void)
>   {
>   	struct rockchip_cru *cru = rockchip_get_cru();
>   	char *cause = NULL;
> @@ -41,12 +41,6 @@ static char *get_reset_cause(void)
>   		cause = "unknown reset";
>   	}
>   
> -	/**
> -	 * reset_reason env is used by rk3288, due to special use case
> -	 * to figure it the boot behavior. so keep this as it is.
> -	 */
> -	env_set("reset_reason", cause);
> -
>   	/*
>   	 * Clear glb_rst_st, so we can determine the last reset cause
>   	 * for following resets.
> @@ -56,12 +50,22 @@ static char *get_reset_cause(void)
>   	return cause;
>   }
>   
> +#ifdef CONFIG_DISPLAY_CPUINFO
>   int print_cpuinfo(void)
>   {
> +	char *cause = get_reset_cause();
> +
>   	printf("SoC: Rockchip %s\n", CONFIG_SYS_SOC);
> -	printf("Reset cause: %s\n", get_reset_cause());
> +	printf("Reset cause: %s\n", cause);
> +
> +	/**
> +	 * reset_reason env is used by rk3288, due to special use case
> +	 * to figure it the boot behavior. so keep this as it is.
> +	 */
> +	env_set("reset_reason", cause);
>   
>   	/* TODO print operating temparature and clock */
>   
>   	return 0;
>   }
> +#endif
Jagan Teki July 13, 2020, 7:57 p.m. UTC | #2 
Hi Kever,

On Sun, Jun 28, 2020 at 8:17 AM Kever Yang <kever.yang@rock-chips.com> wrote:
>
> HI Jagan,
>
> On 2020/6/18 下午11:39, Jagan Teki wrote:
> > reset cause is a generic functionality based on the soc
> > cru registers in rockchip. This can be used for printing
> > the cause of reset in cpuinfo or some other place where
> > reset cause is needed.
> >
> > Other than cpuinfo, reset cause can also be using during
> > bootcount for checking the specific reset cause and glow
> > the led based on the reset cause.
> >
> > So, let's separate the reset cause code from cpuinfo, and
> > add a check to build it for rk3399, rk3288 since these two
> > soc are supporting reset cause as of now.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > Tested-by: Suniel Mahesh <sunil@amarulasolutions.com>
> > ---
> > Changes for v4:
> > - none
> >
> >   arch/arm/include/asm/arch-rockchip/cru.h |  2 ++
> >   arch/arm/mach-rockchip/Makefile          |  5 ++++-
> >   arch/arm/mach-rockchip/cpu-info.c        | 20 ++++++++++++--------
> >   3 files changed, 18 insertions(+), 9 deletions(-)
> >
> > diff --git a/arch/arm/include/asm/arch-rockchip/cru.h b/arch/arm/include/asm/arch-rockchip/cru.h
> > index 5eb17f9d55..317eb61049 100644
> > --- a/arch/arm/include/asm/arch-rockchip/cru.h
> > +++ b/arch/arm/include/asm/arch-rockchip/cru.h
> > @@ -31,4 +31,6 @@ enum {
> >
> >   #define MHz         1000000
> >
> > +char *get_reset_cause(void);
>
> Since you add a environment, you should use that instead of export
> get_reset_cause().

Yes we can read reset_reason env in SPL but there is a fundamental
issue with this, say the previous reset cause is RST so the env set to
RST. For next power-on reset the reset_reason still shows RST since it
was updated previously but the actual cause of the reset is POR.

Jagan.

Patch
diff mbox series 

diff --git a/arch/arm/include/asm/arch-rockchip/cru.h b/arch/arm/include/asm/arch-rockchip/cru.h
index 5eb17f9d55..317eb61049 100644
--- a/arch/arm/include/asm/arch-rockchip/cru.h
+++ b/arch/arm/include/asm/arch-rockchip/cru.h
@@ -31,4 +31,6 @@  enum {
 
 #define MHz		1000000
 
+char *get_reset_cause(void);
+
 #endif /* _ROCKCHIP_CLOCK_H */
diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
index 5b38526fe0..ef4898e00c 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/arch/arm/mach-rockchip/Makefile
@@ -15,6 +15,10 @@  obj-tpl-$(CONFIG_ROCKCHIP_PX30) += px30-board-tpl.o
 
 obj-spl-$(CONFIG_ROCKCHIP_RK3036) += rk3036-board-spl.o
 
+ifeq ($(CONFIG_ROCKCHIP_RK3288)$(CONFIG_ROCKCHIP_RK3399), y)
+obj-y += cpu-info.o
+endif
+
 ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 
 # Always include boot_mode.o, as we bypass it (i.e. turn it off)
@@ -22,7 +26,6 @@  ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 # we can have the preprocessor correctly recognise both 0x0 and 0
 # meaning "turn it off".
 obj-y += boot_mode.o
-obj-$(CONFIG_DISPLAY_CPUINFO) += cpu-info.o
 obj-$(CONFIG_ROCKCHIP_COMMON_BOARD) += board.o
 obj-$(CONFIG_MISC_INIT_R) += misc.o
 endif
diff --git a/arch/arm/mach-rockchip/cpu-info.c b/arch/arm/mach-rockchip/cpu-info.c
index 21ca9dedce..76a840e2c3 100644
--- a/arch/arm/mach-rockchip/cpu-info.c
+++ b/arch/arm/mach-rockchip/cpu-info.c
@@ -13,7 +13,7 @@ 
 #include <asm/arch-rockchip/hardware.h>
 #include <linux/err.h>
 
-static char *get_reset_cause(void)
+char *get_reset_cause(void)
 {
 	struct rockchip_cru *cru = rockchip_get_cru();
 	char *cause = NULL;
@@ -41,12 +41,6 @@  static char *get_reset_cause(void)
 		cause = "unknown reset";
 	}
 
-	/**
-	 * reset_reason env is used by rk3288, due to special use case
-	 * to figure it the boot behavior. so keep this as it is.
-	 */
-	env_set("reset_reason", cause);
-
 	/*
 	 * Clear glb_rst_st, so we can determine the last reset cause
 	 * for following resets.
@@ -56,12 +50,22 @@  static char *get_reset_cause(void)
 	return cause;
 }
 
+#ifdef CONFIG_DISPLAY_CPUINFO
 int print_cpuinfo(void)
 {
+	char *cause = get_reset_cause();
+
 	printf("SoC: Rockchip %s\n", CONFIG_SYS_SOC);
-	printf("Reset cause: %s\n", get_reset_cause());
+	printf("Reset cause: %s\n", cause);
+
+	/**
+	 * reset_reason env is used by rk3288, due to special use case
+	 * to figure it the boot behavior. so keep this as it is.
+	 */
+	env_set("reset_reason", cause);
 
 	/* TODO print operating temparature and clock */
 
 	return 0;
 }
+#endif