Re: [PATCH 04/10] thermal: exynos: remove dead code for TYPE_TWO_POINT_TRIMMING calibration

Amit Kachhap
2014-05-19T05:40:58Z

On 5/5/14, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> wrote:
> Only TYPE_ONE_POINT_TRIMMING calibration is used so remove
> the dead code for TYPE_TWO_POINT_TRIMMING calibration.
I prefer to retain this feature as it is provided by the TMU
controller. This will avoid unnecessary churning of code when some new
soc wants to use it. 2 point trimming should ideally give best
compensated thermal values.
>
> There should be no functional changes caused by this patch.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> ---
> drivers/thermal/samsung/exynos_tmu.c | 55
> ++++++-------------------------
> drivers/thermal/samsung/exynos_tmu.h | 20 +----------
> drivers/thermal/samsung/exynos_tmu_data.c | 17 +---------
> drivers/thermal/samsung/exynos_tmu_data.h | 2 --
> 4 files changed, 12 insertions(+), 82 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c
> b/drivers/thermal/samsung/exynos_tmu.c
> index 9f2a5ee..903566f 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -47,8 +47,7 @@
> * @irq_work: pointer to the irq work structure.
> * @lock: lock to implement synchronization.
> * @clk: pointer to the clock structure.
> - * @temp_error1: fused value of the first point trim.
> - * @temp_error2: fused value of the second point trim.
> + * @temp_error: fused value of the first point trim.
> * @regulator: pointer to the TMU regulator structure.
> * @reg_conf: pointer to structure to register with core thermal.
> */
> @@ -62,14 +61,13 @@ struct exynos_tmu_data {
> struct work_struct irq_work;
> struct mutex lock;
> struct clk *clk;
> - u8 temp_error1, temp_error2;
> + u8 temp_error;
> struct regulator *regulator;
> struct thermal_sensor_conf *reg_conf;
> };
>
> /*
> * TMU treats temperature as a mapped temperature code.
> - * The temperature is converted differently depending on the calibration
> type.
> */
> static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
> {
> @@ -83,20 +81,7 @@ static int temp_to_code(struct exynos_tmu_data *data, u8
> temp)
> goto out;
> }
>
> - switch (pdata->cal_type) {
> - case TYPE_TWO_POINT_TRIMMING:
> - temp_code = (temp - pdata->first_point_trim) *
> - (data->temp_error2 - data->temp_error1) /
> - (pdata->second_point_trim - pdata->first_point_trim) +
> - data->temp_error1;
> - break;
> - case TYPE_ONE_POINT_TRIMMING:
> - temp_code = temp + data->temp_error1 - pdata->first_point_trim;
> - break;
> - default:
> - temp_code = temp + pdata->default_temp_offset;
> - break;
> - }
> + temp_code = temp + data->temp_error - pdata->first_point_trim;
> out:
> return temp_code;
> }
> @@ -117,20 +102,7 @@ static int code_to_temp(struct exynos_tmu_data *data,
> u8 temp_code)
> goto out;
> }
>
> - switch (pdata->cal_type) {
> - case TYPE_TWO_POINT_TRIMMING:
> - temp = (temp_code - data->temp_error1) *
> - (pdata->second_point_trim - pdata->first_point_trim) /
> - (data->temp_error2 - data->temp_error1) +
> - pdata->first_point_trim;
> - break;
> - case TYPE_ONE_POINT_TRIMMING:
> - temp = temp_code - data->temp_error1 + pdata->first_point_trim;
> - break;
> - default:
> - temp = temp_code - pdata->default_temp_offset;
> - break;
> - }
> + temp = temp_code - data->temp_error + pdata->first_point_trim;
> out:
> return temp;
> }
> @@ -179,19 +151,12 @@ static int exynos_tmu_initialize(struct
> platform_device *pdev)
> } else {
> trim_info = readl(data->base + reg->triminfo_data);
> }
> - data->temp_error1 = trim_info & EXYNOS_TMU_TEMP_MASK;
> - data->temp_error2 = ((trim_info >> reg->triminfo_85_shift) &
> - EXYNOS_TMU_TEMP_MASK);
> -
> - if (!data->temp_error1 ||
> - (pdata->min_efuse_value > data->temp_error1) ||
> - (data->temp_error1 > pdata->max_efuse_value))
> - data->temp_error1 = pdata->efuse_value & EXYNOS_TMU_TEMP_MASK;
> -
> - if (!data->temp_error2)
> - data->temp_error2 =
> - (pdata->efuse_value >> reg->triminfo_85_shift) &
> - EXYNOS_TMU_TEMP_MASK;
> + data->temp_error = trim_info & EXYNOS_TMU_TEMP_MASK;
> +
> + if (!data->temp_error ||
> + pdata->min_efuse_value > data->temp_error ||
> + data->temp_error > pdata->max_efuse_value)
> + data->temp_error = pdata->efuse_value & EXYNOS_TMU_TEMP_MASK;
>
> if (pdata->max_trigger_level > MAX_THRESHOLD_LEVS) {
> dev_err(&pdev->dev, "Invalid max trigger level\n");
> diff --git a/drivers/thermal/samsung/exynos_tmu.h
> b/drivers/thermal/samsung/exynos_tmu.h
> index e417af8..186e39e 100644
> --- a/drivers/thermal/samsung/exynos_tmu.h
> +++ b/drivers/thermal/samsung/exynos_tmu.h
> @@ -26,14 +26,6 @@
>
> #include "exynos_thermal_common.h"
>
> -enum calibration_type {
> - TYPE_ONE_POINT_TRIMMING,
> - TYPE_ONE_POINT_TRIMMING_25,
> - TYPE_ONE_POINT_TRIMMING_85,
> - TYPE_TWO_POINT_TRIMMING,
> - TYPE_NONE,
> -};
> -
> enum soc_type {
> SOC_ARCH_EXYNOS4210 = 1,
> SOC_ARCH_EXYNOS4412,
> @@ -74,8 +66,6 @@ enum soc_type {
> * bitfields. The register validity, offsets and bitfield values may vary
> * slightly across different exynos SOC's.
> * @triminfo_data: register containing 2 pont trimming data
> - * @triminfo_25_shift: shift bit of the 25 C trim value in triminfo_data
> reg.
> - * @triminfo_85_shift: shift bit of the 85 C trim value in triminfo_data
> reg.
> * @triminfo_ctrl: trim info controller register.
> * @tmu_ctrl: TMU main controller register.
> * @test_mux_addr_shift: shift bits of test mux address.
> @@ -116,8 +106,6 @@ enum soc_type {
> */
> struct exynos_tmu_registers {
> u32 triminfo_data;
> - u32 triminfo_25_shift;
> - u32 triminfo_85_shift;
>
> u32 triminfo_ctrl;
>
> @@ -207,10 +195,7 @@ struct exynos_tmu_registers {
> * @min_efuse_value: minimum valid trimming data
> * @max_efuse_value: maximum valid trimming data
> * @first_point_trim: temp value of the first point trimming
> - * @second_point_trim: temp value of the second point trimming
> - * @default_temp_offset: default temperature offset in case of no trimming
> * @test_mux; information if SoC supports test MUX
> - * @cal_type: calibration type for temperature
> * @freq_clip_table: Table representing frequency reduction percentage.
> * @freq_tab_count: Count of the above table as frequency reduction may
> * applicable to only some of the trigger levels.
> @@ -232,15 +217,12 @@ struct exynos_tmu_platform_data {
> u8 reference_voltage;
> u8 noise_cancel_mode;
>
> - u32 efuse_value;
> + u8 efuse_value;
> u32 min_efuse_value;
> u32 max_efuse_value;
> u8 first_point_trim;
> - u8 second_point_trim;
> - u8 default_temp_offset;
> u8 test_mux;
>
> - enum calibration_type cal_type;
> enum soc_type type;
> struct freq_clip_table freq_tab[4];
> unsigned int freq_tab_count;
> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c
> b/drivers/thermal/samsung/exynos_tmu_data.c
> index 4b992d9..c32d186 100644
> --- a/drivers/thermal/samsung/exynos_tmu_data.c
> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
> @@ -27,8 +27,6 @@
> #if defined(CONFIG_CPU_EXYNOS4210)
> static const struct exynos_tmu_registers exynos4210_tmu_registers = {
> .triminfo_data = EXYNOS_TMU_REG_TRIMINFO,
> - .triminfo_25_shift = EXYNOS_TRIMINFO_25_SHIFT,
> - .triminfo_85_shift = EXYNOS_TRIMINFO_85_SHIFT,
> .tmu_ctrl = EXYNOS_TMU_REG_CONTROL,
> .buf_vref_sel_shift = EXYNOS_TMU_REF_VOLTAGE_SHIFT,
> .buf_vref_sel_mask = EXYNOS_TMU_REF_VOLTAGE_MASK,
> @@ -66,12 +64,9 @@ struct exynos_tmu_init_data const
> exynos4210_default_tmu_data = {
> .max_trigger_level = 4,
> .gain = 15,
> .reference_voltage = 7,
> - .cal_type = TYPE_ONE_POINT_TRIMMING,
> .min_efuse_value = 40,
> .max_efuse_value = 100,
> .first_point_trim = 25,
> - .second_point_trim = 85,
> - .default_temp_offset = 50,
> .freq_tab[0] = {
> .freq_clip_max = 800 * 1000,
> .temp_level = 85,
> @@ -93,8 +88,6 @@ struct exynos_tmu_init_data const
> exynos4210_default_tmu_data = {
> #if defined(CONFIG_SOC_EXYNOS4412) || defined(CONFIG_SOC_EXYNOS5250)
> static const struct exynos_tmu_registers exynos4412_tmu_registers = {
> .triminfo_data = EXYNOS_TMU_REG_TRIMINFO,
> - .triminfo_25_shift = EXYNOS_TRIMINFO_25_SHIFT,
> - .triminfo_85_shift = EXYNOS_TRIMINFO_85_SHIFT,
> .triminfo_ctrl = EXYNOS_TMU_TRIMINFO_CON,
> .tmu_ctrl = EXYNOS_TMU_REG_CONTROL,
> .test_mux_addr_shift = EXYNOS4412_MUX_ADDR_SHIFT,
> @@ -145,13 +138,10 @@ static const struct exynos_tmu_registers
> exynos4412_tmu_registers = {
> .gain = 8, \
> .reference_voltage = 16, \
> .noise_cancel_mode = 4, \
> - .cal_type = TYPE_ONE_POINT_TRIMMING, \
> .efuse_value = 55, \
> .min_efuse_value = 40, \
> .max_efuse_value = 100, \
> .first_point_trim = 25, \
> - .second_point_trim = 85, \
> - .default_temp_offset = 50, \
> .freq_tab[0] = { \
> .freq_clip_max = 1400 * 1000, \
> .temp_level = 70, \
> @@ -195,8 +185,6 @@ struct exynos_tmu_init_data const
> exynos5250_default_tmu_data = {
> #if defined(CONFIG_SOC_EXYNOS5440)
> static const struct exynos_tmu_registers exynos5440_tmu_registers = {
> .triminfo_data = EXYNOS5440_TMU_S0_7_TRIM,
> - .triminfo_25_shift = EXYNOS_TRIMINFO_25_SHIFT,
> - .triminfo_85_shift = EXYNOS_TRIMINFO_85_SHIFT,
> .tmu_ctrl = EXYNOS5440_TMU_S0_7_CTRL,
> .buf_vref_sel_shift = EXYNOS_TMU_REF_VOLTAGE_SHIFT,
> .buf_vref_sel_mask = EXYNOS_TMU_REF_VOLTAGE_MASK,
> @@ -240,13 +228,10 @@ static const struct exynos_tmu_registers
> exynos5440_tmu_registers = {
> .gain = 5, \
> .reference_voltage = 16, \
> .noise_cancel_mode = 4, \
> - .cal_type = TYPE_ONE_POINT_TRIMMING, \
> - .efuse_value = 0x5b2d, \
> + .efuse_value = 45, \
> .min_efuse_value = 16, \
> .max_efuse_value = 76, \
> .first_point_trim = 25, \
> - .second_point_trim = 70, \
> - .default_temp_offset = 25, \
> .type = SOC_ARCH_EXYNOS5440, \
> .registers = &exynos5440_tmu_registers, \
> .features = (TMU_SUPPORT_EMULATION | TMU_SUPPORT_FALLING_TRIP | \
> diff --git a/drivers/thermal/samsung/exynos_tmu_data.h
> b/drivers/thermal/samsung/exynos_tmu_data.h
> index 1fed00d..734d1f9 100644
> --- a/drivers/thermal/samsung/exynos_tmu_data.h
> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
> @@ -51,8 +51,6 @@
> #define EXYNOS_THD_TEMP_FALL 0x54
> #define EXYNOS_EMUL_CON 0x80
>
> -#define EXYNOS_TRIMINFO_25_SHIFT 0
> -#define EXYNOS_TRIMINFO_85_SHIFT 8
> #define EXYNOS_TMU_RISE_INT_MASK 0x111
> #define EXYNOS_TMU_RISE_INT_SHIFT 0
> #define EXYNOS_TMU_FALL_INT_MASK 0x111
> --
> 1.8.2.3
>
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