Re: [PATCH 1/3 v4] thermal: samsung: correct the fall interrupt en,status bit fields

[Bartlomiej Zolnierkiewicz]

On Monday, October 14, 2013 10:18:03 AM Eduardo Valentin wrote:
> On 11-10-2013 11:57, Bartlomiej Zolnierkiewicz wrote:
> > 
> > Hi,
> > 
> > On Friday, October 11, 2013 11:10:38 AM Eduardo Valentin wrote:
> >> Hi Naveen,
> >>
> >> On 09-10-2013 10:03, Bartlomiej Zolnierkiewicz wrote:
> >>>
> >>> Hi,
> >>>
> >>> All patches (#1-#3) look good to me, FWIW you can add:
> >>>
> >>> 	Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> >>>
> >>> Please note that (at least) patch #3 conflicts with Lukasz's EXYNOS4412
> >>> fixup patchset:
> >>>
> >>> 	https://lkml.org/lkml/2013/10/9/35
> >>>
> >>> It is up to Eduardo to resolve this but it probably would be better to
> >>> merge EXYNOS4412 fixes first and then add EXYNOS5420 support. This would
> >>> require you to port patch #3 over Lukasz's patchset though.
> >>
> >> My question is if this fix applies also to EXYNOS4412, as it  is not
> >> mentioned in the patch description and the change affects all supported
> > 
> > This patch doesn't affect EXYNOS4210 as exynos4210_tmu_registers struct
> 
> I was, at least for now, worried about 4412, as I mentioned above.
> 
> > uses the default zero value for inten_fall_mask, inten_fall_shift and
> > intclr_fall_shift.
> > 
> >> chip version deliberately. Has this change been validated on all
> >> supported chip versions?
> >>
> >> Amit, I saw you ack, but still, it is not clear how this change behaves
> >> across supported hardware.
> > 
> > For EXYNOS4412 and EXYNOS5250 this patch doesn't cause any functionality
> > changes because while the patch changes inten_fall_shift usage to
> > intclr_fall_shift one in exynos_tmu_initialize() it defines
> > EXYNOS_TMU_CLEAR_FALL_INT_SHIFT to 12 (old EXYNOS_TMU_FALL_INT_SHIFT
> > value).
> > 
> 
> OK. Then the patch is about a symbol rename, right?

Yes and while doing so it also changes the define and the value used on
EXYNOS5440. I checked this change against the documentation today (please
see below).

> > This patch only changes driver behavior for EXYNOS5440 on which the
> > used shift value changes from 4 to 12.
> 
> I see.

tmu_intstat and tmu_intclear refer to the same register on EXYNOS5440
(EXYNOS5440_TMU_S0_7_IRQ defined to 0x230) and the documentation that
I have says that the value 4 (which matches EXYNOS5440_TMU_FALL_INT_SHIFT
before the patch) should be used for the shift value. However the patch
doesn't define EXYNOS5440_TMU_CLEAR_FALL_INT_SHIFT and instead makes
the code use generic EXYNOS_TMU_CLEAR_FALL_INT_SHIFT (defined to value
12) also on EXYNOS5440. This doesn't seem correct.

Naveen, this issue needs to be either fixed or explained properly (if
the documentation is wrong) in the patch description. Please also put some
information about hardware that you've tested your patch on in the patch
description.

> > 
> > PS I've only noticed it now but after this patch inten_fall_shift becomes
> > unused and can be removed.
> > 
> 
> 
> Then we should remove it.

I completely agree.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> > Best regards,
> > --
> > Bartlomiej Zolnierkiewicz
> > Samsung R&D Institute Poland
> > Samsung Electronics
> > 
> >>>
> >>> Best regards,
> >>> --
> >>> Bartlomiej Zolnierkiewicz
> >>> Samsung R&D Institute Poland
> >>> Samsung Electronics
> >>>
> >>> On Wednesday, October 09, 2013 05:38:27 PM Naveen Krishna Chatradhi wrote:
> >>>> The FALL interrupt related en, status bits are available at an offset of
> >>>> 16 on INTEN, INTSTAT registers and at an offset of
> >>>> 12 on INTCLEAR register.
> >>>>
> >>>> This patch corrects the same for exyns5250 and exynos5440
> >>>>
> >>>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
> >>>> ---
> >>>> Changes since v1:
> >>>> Changes since v2:
> >>>> Changes since v3:
> >>>>   None
> >>>>
> >>>>  drivers/thermal/samsung/exynos_tmu.c      |    2 +-
> >>>>  drivers/thermal/samsung/exynos_tmu.h      |    2 ++
> >>>>  drivers/thermal/samsung/exynos_tmu_data.c |    2 ++
> >>>>  drivers/thermal/samsung/exynos_tmu_data.h |    3 ++-
> >>>>  4 files changed, 7 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> >>>> index b43afda..af69209 100644
> >>>> --- a/drivers/thermal/samsung/exynos_tmu.c
> >>>> +++ b/drivers/thermal/samsung/exynos_tmu.c
> >>>> @@ -265,7 +265,7 @@ skip_calib_data:
> >>>>  				data->base + reg->threshold_th1);
> >>>>  
> >>>>  		writel((reg->inten_rise_mask << reg->inten_rise_shift) |
> >>>> -			(reg->inten_fall_mask << reg->inten_fall_shift),
> >>>> +			(reg->inten_fall_mask << reg->intclr_fall_shift),
> >>>>  				data->base + reg->tmu_intclear);
> >>>>  
> >>>>  		/* if last threshold limit is also present */
> >>>> diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
> >>>> index b364c9e..7c6c34a 100644
> >>>> --- a/drivers/thermal/samsung/exynos_tmu.h
> >>>> +++ b/drivers/thermal/samsung/exynos_tmu.h
> >>>> @@ -134,6 +134,7 @@ enum soc_type {
> >>>>   * @inten_fall3_shift: shift bits of falling 3 interrupt bits.
> >>>>   * @tmu_intstat: Register containing the interrupt status values.
> >>>>   * @tmu_intclear: Register for clearing the raised interrupt status.
> >>>> + * @intclr_fall_shift: shift bits for interrupt clear fall 0
> >>>>   * @emul_con: TMU emulation controller register.
> >>>>   * @emul_temp_shift: shift bits of emulation temperature.
> >>>>   * @emul_time_shift: shift bits of emulation time.
> >>>> @@ -204,6 +205,7 @@ struct exynos_tmu_registers {
> >>>>  	u32	tmu_intstat;
> >>>>  
> >>>>  	u32	tmu_intclear;
> >>>> +	u32	intclr_fall_shift;
> >>>>  
> >>>>  	u32	emul_con;
> >>>>  	u32	emul_temp_shift;
> >>>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
> >>>> index 9002499..23fea23 100644
> >>>> --- a/drivers/thermal/samsung/exynos_tmu_data.c
> >>>> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
> >>>> @@ -122,6 +122,7 @@ static const struct exynos_tmu_registers exynos5250_tmu_registers = {
> >>>>  	.inten_fall0_shift = EXYNOS_TMU_INTEN_FALL0_SHIFT,
> >>>>  	.tmu_intstat = EXYNOS_TMU_REG_INTSTAT,
> >>>>  	.tmu_intclear = EXYNOS_TMU_REG_INTCLEAR,
> >>>> +	.intclr_fall_shift = EXYNOS_TMU_CLEAR_FALL_INT_SHIFT,
> >>>>  	.emul_con = EXYNOS_EMUL_CON,
> >>>>  	.emul_temp_shift = EXYNOS_EMUL_DATA_SHIFT,
> >>>>  	.emul_time_shift = EXYNOS_EMUL_TIME_SHIFT,
> >>>> @@ -210,6 +211,7 @@ static const struct exynos_tmu_registers exynos5440_tmu_registers = {
> >>>>  	.inten_fall0_shift = EXYNOS5440_TMU_INTEN_FALL0_SHIFT,
> >>>>  	.tmu_intstat = EXYNOS5440_TMU_S0_7_IRQ,
> >>>>  	.tmu_intclear = EXYNOS5440_TMU_S0_7_IRQ,
> >>>> +	.intclr_fall_shift = EXYNOS_TMU_CLEAR_FALL_INT_SHIFT,
> >>>>  	.tmu_irqstatus = EXYNOS5440_TMU_IRQ_STATUS,
> >>>>  	.emul_con = EXYNOS5440_TMU_S0_7_DEBUG,
> >>>>  	.emul_temp_shift = EXYNOS_EMUL_DATA_SHIFT,
> >>>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
> >>>> index dc7feb5..8788a87 100644
> >>>> --- a/drivers/thermal/samsung/exynos_tmu_data.h
> >>>> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
> >>>> @@ -69,9 +69,10 @@
> >>>>  #define EXYNOS_TMU_RISE_INT_MASK	0x111
> >>>>  #define EXYNOS_TMU_RISE_INT_SHIFT	0
> >>>>  #define EXYNOS_TMU_FALL_INT_MASK	0x111
> >>>> -#define EXYNOS_TMU_FALL_INT_SHIFT	12
> >>>> +#define EXYNOS_TMU_FALL_INT_SHIFT	16
> >>>>  #define EXYNOS_TMU_CLEAR_RISE_INT	0x111
> >>>>  #define EXYNOS_TMU_CLEAR_FALL_INT	(0x111 << 12)
> >>>> +#define EXYNOS_TMU_CLEAR_FALL_INT_SHIFT	12
> >>>>  #define EXYNOS_TMU_TRIP_MODE_SHIFT	13
> >>>>  #define EXYNOS_TMU_TRIP_MODE_MASK	0x7
> >>>>  #define EXYNOS_TMU_THERM_TRIP_EN_SHIFT	12

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