linux-kernel - Re: [PATCH 3/3] ARM: tegra: Add thermal reset (thermtrip) support to PMC

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Message-ID: <53EB397A.7000501@nvidia.com>
Date:	Wed, 13 Aug 2014 18:10:02 +0800
From:	Wei Ni <wni@...dia.com>
To:	Mikko Perttunen <mperttunen@...dia.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: tegra: Add thermal reset (thermtrip) support
 to PMC

On 08/05/2014 04:13 PM, Mikko Perttunen wrote:
> This adds a device tree controlled option to enable PMC-based
> thermal reset in overheating situations. Thermtrip is supported on
> Tegra114 and Tegra124. The thermal reset only works when the thermal
> sensors are calibrated, so a soctherm driver is also required.
> 
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
>  drivers/soc/tegra/pmc.c | 348 ++++++++++++++++++++++++++++++------------------
>  1 file changed, 216 insertions(+), 132 deletions(-)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index a2c0ceb..2c617d7 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -83,11 +83,28 @@
> 
>  #define GPU_RG_CNTRL                   0x2d4
> 
> +#define PMC_SENSOR_CTRL                        0x1b0
> +#define PMC_SENSOR_CTRL_SCRATCH_WRITE  (1 << 2)
> +#define PMC_SENSOR_CTRL_ENABLE_RST     (1 << 1)
> +
> +#define PMC_SCRATCH54                  0x258
> +#define PMC_SCRATCH54_DATA_SHIFT       8
> +#define PMC_SCRATCH54_ADDR_SHIFT       0
> +
> +#define PMC_SCRATCH55                  0x25c
> +#define PMC_SCRATCH55_RESET_TEGRA      (1 << 31)
> +#define PMC_SCRATCH55_CNTRL_ID_SHIFT   27
> +#define PMC_SCRATCH55_PINMUX_SHIFT     24
> +#define PMC_SCRATCH55_16BITOP          (1 << 15)
> +#define PMC_SCRATCH55_CHECKSUM_SHIFT   16
> +#define PMC_SCRATCH55_I2CSLV1_SHIFT    0
> +
>  struct tegra_pmc_soc {
>         unsigned int num_powergates;
>         const char *const *powergates;
>         unsigned int num_cpu_powergates;
>         const u8 *cpu_powergates;
> +       bool has_thermal_reset;

According to the DRM, the scratch54/55 is used for TSENSE_RESET, so I
prefer to change the name to has_tsense_reset().

>  };
> 
>  /**
> @@ -606,6 +623,203 @@ void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode)
>  }

> +
> +void tegra_pmc_init_thermal_reset(struct device_node *np)

I prefer to change the name to tegra_pmc_init_tsense_reset().

> +{
> +       u32 pmu_i2c_addr, i2c_ctrl_id, reg_addr, reg_data, pinmux;
> +       bool pmu_16bit_ops;
> +       u32 val, checksum;
> +       const struct of_device_id *match = of_match_node(tegra_pmc_match, np);
> +       const struct tegra_pmc_soc *data = match->data;
> +

> --
> 1.8.1.5
> 
> --
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> 

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