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Message-id: <13170930.3cdcLOtxou@amdc1032>
Date: Mon, 25 Aug 2014 13:19:04 +0200
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Chanwoo Choi <cw00.choi@...sung.com>
Cc: linux-arm-kernel@...ts.infradead.org, eduardo.valentin@...com,
amit.daniel@...sung.com, rui.zhang@...el.com, mark.rutland@....com,
devicetree@...r.kernel.org, kgene.kim@...sung.com,
pawel.moll@....com, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Eduardo Valentin <edubezval@...il.com>,
linux-samsung-soc@...r.kernel.org, kyungmin.park@...sung.com,
robh+dt@...nel.org, galak@...eaurora.org, ch.naveen@...sung.com
Subject: Re: [PATCHv4 2/4] thermal: exynos: Add support for many TRIMINFO_CTRL
registers
On Monday, August 25, 2014 07:37:25 PM Chanwoo Choi wrote:
> Hi Bartlomiej,
>
> On 08/25/2014 07:15 PM, Bartlomiej Zolnierkiewicz wrote:
> >
> > Hi,
> >
> > On Monday, August 25, 2014 04:30:23 PM Chanwoo Choi wrote:
> >> This patch support many TRIMINFO_CTRL registers if specific Exynos SoC
> >> has one more TRIMINFO_CTRL registers. Also this patch uses proper 'RELOAD'
> >> shift/mask bit operation to set RELOAD feature instead of static value.
> >>
> >> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> >> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> >> Cc: Zhang Rui <rui.zhang@...el.com>
> >> Cc: Eduardo Valentin <edubezval@...il.com>
> >> Cc: Amit Daniel Kachhap <amit.daniel@...sung.com>
> >> Reviewed-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> >> ---
> >> drivers/thermal/samsung/exynos_thermal_common.h | 1 +
> >> drivers/thermal/samsung/exynos_tmu.c | 23 ++++++++++++++++++++---
> >> drivers/thermal/samsung/exynos_tmu.h | 9 +++++++--
> >> drivers/thermal/samsung/exynos_tmu_data.c | 5 ++++-
> >> drivers/thermal/samsung/exynos_tmu_data.h | 3 +++
> >> 5 files changed, 35 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/thermal/samsung/exynos_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
> >> index 3eb2ed9..b211976 100644
> >> --- a/drivers/thermal/samsung/exynos_thermal_common.h
> >> +++ b/drivers/thermal/samsung/exynos_thermal_common.h
> >> @@ -28,6 +28,7 @@
> >> #define MAX_TRIP_COUNT 8
> >> #define MAX_COOLING_DEVICE 4
> >> #define MAX_THRESHOLD_LEVS 5
> >> +#define MAX_TRIMINFO_CTRL_REG 2
> >>
> >> #define ACTIVE_INTERVAL 500
> >> #define IDLE_INTERVAL 10000
> >> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> >> index acbff14..7234f38 100644
> >> --- a/drivers/thermal/samsung/exynos_tmu.c
> >> +++ b/drivers/thermal/samsung/exynos_tmu.c
> >> @@ -147,7 +147,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> >> struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> >> struct exynos_tmu_platform_data *pdata = data->pdata;
> >> const struct exynos_tmu_registers *reg = pdata->registers;
> >> - unsigned int status, trim_info = 0, con;
> >> + unsigned int status, trim_info = 0, con, ctrl;
> >> unsigned int rising_threshold = 0, falling_threshold = 0;
> >> int ret = 0, threshold_code, i, trigger_levs = 0;
> >>
> >> @@ -164,8 +164,25 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> >> }
> >> }
> >>
> >> - if (TMU_SUPPORTS(pdata, TRIM_RELOAD))
> >> - __raw_writel(1, data->base + reg->triminfo_ctrl);
> >> + if (TMU_SUPPORTS(pdata, TRIM_RELOAD)) {
> >> + if (reg->triminfo_ctrl_count > MAX_TRIMINFO_CTRL_REG) {
> >
> > Please remove this check and MAX_TRIMINFO_CTRL_REG define.
> >
> > We do not want such runtime checks for development time errors.
>
> OK, I'll remove it.
>
> >
> >> + ret = -EINVAL;
> >> + goto out;
> >> + }
> >> +
> >> + for (i = 0; i < reg->triminfo_ctrl_count; i++) {
> >> + if (pdata->triminfo_reload[i]) {
> >> + ctrl = readl(data->base +
> >> + reg->triminfo_ctrl[i]);
> >> + ctrl &= ~(reg->triminfo_reload_mask <<
> >> + reg->triminfo_reload_shift);
> >> + ctrl |= pdata->triminfo_reload[i] <<
> >> + reg->triminfo_reload_shift;
> >
> > triminfo_reload_shift and triminfo_reload_mask variables have always
> > the same values when this code is run so there is no need for them.
>
> I don't understand. Do you mean that timinfo_reload_{shift/mask} variable is un-needed?
Yes.
> If you possible, I need more detailed comment.
Currently triminfo_reload_shift is always "0" and triminfo_reload_mask
is "1" so there is no need to add an abstraction for different SoCs
(it should be added only when there is a real need for it).
Please just rewrite this code as:
if (pdata->triminfo_reload[i]) {
ctrl = readl(data->base +
reg->triminfo_ctrl[i]);
ctrl |= pdata->triminfo_reload[i];
__raw_writel(ctrl, data->base +
reg->triminfo_ctrl[i]);
}
Then you can remove unused triminfo_reload_shift and
EXYNOS_TRIMINFO_RELOAD_SHIFT.
Please also include my patch (https://lkml.org/lkml/2014/8/20/481) in
your patch series (or at least mark it in the cover letter that my
patch should be merged before your patch #2/4).
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
> > They should be added only when needed instead of doing it now.
> >
> >> + __raw_writel(ctrl, data->base +
> >> + reg->triminfo_ctrl[i]);
> >> + }
> >> + }
> >> + }
> >>
> >> if (pdata->cal_mode == HW_MODE)
> >> goto skip_calib_data;
> >> diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
> >> index 1b4a644..d7674ad 100644
> >> --- a/drivers/thermal/samsung/exynos_tmu.h
> >> +++ b/drivers/thermal/samsung/exynos_tmu.h
> >> @@ -85,8 +85,11 @@ enum soc_type {
> >> * @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.
> >> + * @triminfo_ctrl_count: the number of trim info controller register.
> >> * @triminfo_reload_shift: shift of triminfo reload enable bit in triminfo_ctrl
> >> reg.
> >> + * @triminfo_reload_mask: mask of triminfo reload enable bit in triminfo_ctrl
> >> + reg.
> >> * @tmu_ctrl: TMU main controller register.
> >> * @test_mux_addr_shift: shift bits of test mux address.
> >> * @buf_vref_sel_shift: shift bits of reference voltage in tmu_ctrl register.
> >> @@ -151,9 +154,10 @@ struct exynos_tmu_registers {
> >> u32 triminfo_25_shift;
> >> u32 triminfo_85_shift;
> >>
> >> - u32 triminfo_ctrl;
> >> - u32 triminfo_ctrl1;
> >> + u32 triminfo_ctrl[MAX_TRIMINFO_CTRL_REG];
> >> + u32 triminfo_ctrl_count;
> >> u32 triminfo_reload_shift;
> >> + u32 triminfo_reload_mask;
> >>
> >> u32 tmu_ctrl;
> >> u32 test_mux_addr_shift;
> >> @@ -295,6 +299,7 @@ struct exynos_tmu_platform_data {
> >> u8 second_point_trim;
> >> u8 default_temp_offset;
> >> u8 test_mux;
> >> + u8 triminfo_reload[MAX_TRIMINFO_CTRL_REG];
> >>
> >> enum calibration_type cal_type;
> >> enum calibration_mode cal_mode;
> >> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
> >> index aa8e0de..754c638 100644
> >> --- a/drivers/thermal/samsung/exynos_tmu_data.c
> >> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
> >> @@ -184,8 +184,10 @@ 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,
> >> + .triminfo_ctrl[0] = EXYNOS_TMU_TRIMINFO_CON,
> >> + .triminfo_ctrl_count = 1,
> >> .triminfo_reload_shift = EXYNOS_TRIMINFO_RELOAD_SHIFT,
> >> + .triminfo_reload_mask = EXYNOS_TRIMINFO_RELOAD_MASK,
> >> .tmu_ctrl = EXYNOS_TMU_REG_CONTROL,
> >> .test_mux_addr_shift = EXYNOS4412_MUX_ADDR_SHIFT,
> >> .buf_vref_sel_shift = EXYNOS_TMU_REF_VOLTAGE_SHIFT,
> >> @@ -252,6 +254,7 @@ static const struct exynos_tmu_registers exynos4412_tmu_registers = {
> >> .temp_level = 95, \
> >> }, \
> >> .freq_tab_count = 2, \
> >> + .triminfo_reload[0] = EXYNOS_TRIMINFO_RELOAD_ENABLE, \
> >> .registers = &exynos4412_tmu_registers, \
> >> .features = (TMU_SUPPORT_EMULATION | TMU_SUPPORT_TRIM_RELOAD | \
> >> TMU_SUPPORT_FALLING_TRIP | TMU_SUPPORT_READY_STATUS | \
> >> diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
> >> index 401bab7..87454f63 100644
> >> --- a/drivers/thermal/samsung/exynos_tmu_data.h
> >> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
> >> @@ -64,6 +64,9 @@
> >> #define EXYNOS_EMUL_CON 0x80
> >>
> >> #define EXYNOS_TRIMINFO_RELOAD_SHIFT 0
> >> +#define EXYNOS_TRIMINFO_RELOAD_MASK 0x1
> >> +#define EXYNOS_TRIMINFO_RELOAD_ENABLE 1
> >> +#define EXYNOS_TRIMINFO_RELOAD_DISABLE 0
> >
> > This define is never used please remove it.
>
> OK, I'll remove it. Thanks.
>
> Beset Regards,
> Chanwoo CHoi
--
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