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

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Message-id: <1615083.zyGXhBfPcS@amdc1032>
Date:	Fri, 11 Oct 2013 17:57:45 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	linux-pm@...r.kernel.org, naveenkrishna.ch@...il.com,
	rui.zhang@...el.com, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, amit.daniel@...sung.com,
	kgene.kim@...sung.com, devicetree@...r.kernel.org,
	Lukasz Majewski <l.majewski@...sung.com>
Subject: Re: [PATCH 1/3 v4] thermal: samsung: correct the fall interrupt en,
 status bit fields


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@...sung.com>
> > 
> > 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
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).

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

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

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@...sung.com>
> >> ---
> >> 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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