[PATCH] cpu: imx8: use intended cpu-thermal device when getting temp value

[Peng Fan]

> Subject: [PATCH] cpu: imx8: use intended cpu-thermal device when getting
> temp value
> 
> This fixes getting DT alert and critical pdata values in imx_scu_thermal driver.
> On i.MX8QXP using not initialized alert pdata value resulted in boot hang and
> endless loop outputting:
> CPU Temperature (47200C) has beyond alert (0C), close to critical (0C)
> waiting...
> 
> While at it, preset CPU type values once to avoid multiple calls of
> device_is_compatible() for same property.
> 
> Fixes: 3ee6ea443eb4 ("cpu: imx_cpu: Print the CPU temperature for iMX8QM
> A72")
> Signed-off-by: Anatolij Gustschin <agust at denx.de>
> ---
> This one supersedes the older patch here:
> 
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpatchw
> ork.ozlabs.org%2Fproject%2Fuboot%2Fpatch%2F20200516203420.24409-2-a
> gust%40denx.de&data=02%7C01%7Cpeng.fan%40nxp.com%7C3a05de6
> b676d4479832a08d7fc4ccc4d%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C
> 0%7C0%7C637255279084654887&sdata=W7kv5XqeSrcxcOHNgE0TgcR8
> POPyt3VR4EsWszlFXLI%3D&reserved=0
> 
>  drivers/cpu/imx8_cpu.c | 50 +++++++++++++++++++++---------------------
>  1 file changed, 25 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/cpu/imx8_cpu.c b/drivers/cpu/imx8_cpu.c index
> 896e1ac776..adc4919d9e 100644
> --- a/drivers/cpu/imx8_cpu.c
> +++ b/drivers/cpu/imx8_cpu.c
> @@ -18,6 +18,7 @@ struct cpu_imx_platdata {
>  	const char *name;
>  	const char *rev;
>  	const char *type;
> +	u32 cpu_rsrc;
>  	u32 cpurev;
>  	u32 freq_mhz;
>  	u32 mpidr;
> @@ -50,16 +51,23 @@ const char *get_imx8_rev(u32 rev)
>  	}
>  }
> 
> -const char *get_core_name(struct udevice *dev)
> +static void set_core_data(struct udevice *dev)
>  {
> -	if (device_is_compatible(dev, "arm,cortex-a35"))
> -		return "A35";
> -	else if (device_is_compatible(dev, "arm,cortex-a53"))
> -		return "A53";
> -	else if (device_is_compatible(dev, "arm,cortex-a72"))
> -		return "A72";
> -	else
> -		return "?";
> +	struct cpu_imx_platdata *plat = dev_get_platdata(dev);
> +
> +	if (device_is_compatible(dev, "arm,cortex-a35")) {
> +		plat->cpu_rsrc = SC_R_A35;
> +		plat->name = "A35";
> +	} else if (device_is_compatible(dev, "arm,cortex-a53")) {
> +		plat->cpu_rsrc = SC_R_A53;
> +		plat->name = "A53";
> +	} else if (device_is_compatible(dev, "arm,cortex-a72")) {
> +		plat->cpu_rsrc = SC_R_A72;
> +		plat->name = "A72";
> +	} else {
> +		plat->cpu_rsrc = SC_R_A53;
> +		plat->name = "?";
> +	}
>  }
> 
>  #if IS_ENABLED(CONFIG_IMX_SCU_THERMAL)
> @@ -67,12 +75,12 @@ static int cpu_imx_get_temp(struct cpu_imx_platdata
> *plat)  {
>  	struct udevice *thermal_dev;
>  	int cpu_tmp, ret;
> +	int idx = 1; /* use "cpu-thermal0" device */
> 
> -	if (!strcmp(plat->name, "A72"))
> -		ret = uclass_get_device(UCLASS_THERMAL, 1, &thermal_dev);
> -	else
> -		ret = uclass_get_device(UCLASS_THERMAL, 0, &thermal_dev);
> +	if (plat->cpu_rsrc == SC_R_A72)
> +		idx = 2; /* use "cpu-thermal1" device */
> 
> +	ret = uclass_get_device(UCLASS_THERMAL, idx, &thermal_dev);
>  	if (!ret) {
>  		ret = thermal_get_temp(thermal_dev, &cpu_tmp);
>  		if (ret)
> @@ -180,19 +188,11 @@ static const struct udevice_id cpu_imx8_ids[] = {
> 
>  static ulong imx8_get_cpu_rate(struct udevice *dev)  {
> +	struct cpu_imx_platdata *plat = dev_get_platdata(dev);
>  	ulong rate;
> -	int ret, type;
> -
> -	if (device_is_compatible(dev, "arm,cortex-a35"))
> -		type = SC_R_A35;
> -	else if (device_is_compatible(dev, "arm,cortex-a53"))
> -		type = SC_R_A53;
> -	else if (device_is_compatible(dev, "arm,cortex-a72"))
> -		type = SC_R_A72;
> -	else
> -		return 0;
> +	int ret;
> 
> -	ret = sc_pm_get_clock_rate(-1, type, SC_PM_CLK_CPU,
> +	ret = sc_pm_get_clock_rate(-1, plat->cpu_rsrc, SC_PM_CLK_CPU,
>  				   (sc_pm_clock_rate_t *)&rate);
>  	if (ret) {
>  		printf("Could not read CPU frequency: %d\n", ret); @@ -207,9
> +207,9 @@ static int imx8_cpu_probe(struct udevice *dev)
>  	struct cpu_imx_platdata *plat = dev_get_platdata(dev);
>  	u32 cpurev;
> 
> +	set_core_data(dev);
>  	cpurev = get_cpu_rev();
>  	plat->cpurev = cpurev;
> -	plat->name = get_core_name(dev);
>  	plat->rev = get_imx8_rev(cpurev & 0xFFF);
>  	plat->type = get_imx8_type((cpurev & 0xFF000) >> 12);
>  	plat->freq_mhz = imx8_get_cpu_rate(dev) / 1000000;
> --
> 2.17.1

Reviewed-by: Peng Fan <peng.fan at nxp.com>