linux-kernel - Re: [PATCH V7 03/12] thermal: tegra: get rid of PDIV/HOTSPOT hack

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Date:	Tue, 15 Mar 2016 12:56:25 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Wei Ni <wni@...dia.com>
Cc:	rui.zhang@...el.com, thierry.reding@...il.com,
	MLongnecker@...dia.com, swarren@...dotorg.org,
	mikko.perttunen@...si.fi, linux-tegra@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 03/12] thermal: tegra: get rid of PDIV/HOTSPOT hack

On Tue, Mar 15, 2016 at 02:21:53PM +0800, Wei Ni wrote:
> 
> 
> On 2016年03月15日 04:05, Eduardo Valentin wrote:
> > * PGP Signed by an unknown key
> > 
> > On Fri, Mar 11, 2016 at 11:09:14AM +0800, Wei Ni wrote:
> >> Get rid of T124-specific PDIV/HOTSPOT hack.
> >> tegra-soctherm.c contained a hack to set the SENSOR_PDIV and
> >> SENSOR_HOTSPOT_OFFSET registers - it just did two writes of
> >> T124-specific opaque values.  Convert these into a form that can be
> >> substituted on a per-chip basis, and into structure fields that have
> >> at least some independent meaning.
> >>
> >> Signed-off-by: Wei Ni <wni@...dia.com>
> >> ---
> >>  drivers/thermal/tegra/tegra-soctherm.c | 18 ++++++++++++++----
> >>  1 file changed, 14 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/thermal/tegra/tegra-soctherm.c b/drivers/thermal/tegra/tegra-soctherm.c
> >> index b3ec0faa2bee..b4b791ebfbb6 100644
> >> --- a/drivers/thermal/tegra/tegra-soctherm.c
> >> +++ b/drivers/thermal/tegra/tegra-soctherm.c
> >> @@ -48,14 +48,12 @@
> >>  #define SENSOR_CONFIG2_THERMB_SHIFT		0
> >>  
> >>  #define SENSOR_PDIV				0x1c0
> >> -#define SENSOR_PDIV_T124			0x8888
> >>  #define SENSOR_PDIV_CPU_MASK			(0xf << 12)
> >>  #define SENSOR_PDIV_GPU_MASK			(0xf << 8)
> >>  #define SENSOR_PDIV_MEM_MASK			(0xf << 4)
> >>  #define SENSOR_PDIV_PLLX_MASK			(0xf << 0)
> >>  
> >>  #define SENSOR_HOTSPOT_OFF			0x1c4
> >> -#define SENSOR_HOTSPOT_OFF_T124			0x00060600
> >>  #define SENSOR_HOTSPOT_CPU_MASK			(0xff << 16)
> >>  #define SENSOR_HOTSPOT_GPU_MASK			(0xff << 8)
> >>  #define SENSOR_HOTSPOT_MEM_MASK			(0xff << 0)
> >> @@ -436,6 +434,7 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
> >>  	struct resource *res;
> >>  	unsigned int i;
> >>  	int err;
> >> +	u32 pdiv, hotspot;
> >>  
> >>  	const struct tegra_tsensor *tsensors = t124_tsensors;
> >>  	const struct tegra_tsensor_group **ttgs = tegra124_tsensor_groups;
> >> @@ -493,8 +492,19 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
> >>  			goto disable_clocks;
> >>  	}
> >>  
> >> -	writel(SENSOR_PDIV_T124, tegra->regs + SENSOR_PDIV);
> >> -	writel(SENSOR_HOTSPOT_OFF_T124, tegra->regs + SENSOR_HOTSPOT_OFF);
> >> +	/* Program pdiv and hotspot offsets per THERM */
> >> +	pdiv = readl(tegra->regs + SENSOR_PDIV);
> >> +	hotspot = readl(tegra->regs + SENSOR_HOTSPOT_OFF);
> >> +	for (i = 0; i < TEGRA124_SOCTHERM_SENSOR_NUM; ++i) {
> >> +		pdiv = REG_SET_MASK(pdiv, ttgs[i]->pdiv_mask,
> >> +				    ttgs[i]->pdiv);
> >> +		if (ttgs[i]->id != TEGRA124_SOCTHERM_SENSOR_PLLX)
> >> +			hotspot =  REG_SET_MASK(hotspot,
> >> +						ttgs[i]->pllx_hotspot_mask,
> >> +						ttgs[i]->pllx_hotspot_diff);
> >> +	}
> >> +	writel(pdiv, tegra->regs + SENSOR_PDIV);
> >> +	writel(hotspot, tegra->regs + SENSOR_HOTSPOT_OFF);
> > 
> > Is the above logic the same for all supported chips? e.g. do we always
> > skip pllx for hotspot configuration?
> 
> Yes, this logic support Tegra124, Tegra210, and Tegra132 which I will send out
> in next series.


Ok. Could you please add a comment then explaining why pllx is not
needed for the hotspot configuration?

> 
> > 
> > 
> >>  
> >>  	/* Initialize thermctl sensors */
> >>  
> >> -- 
> >> 1.9.1
> >>
> > 
> > * Unknown Key
> > * 0x7DA4E256
> > 

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