Message-ID: <7h1qy152p5.fsf@baylibre.com>
Date:   Tue, 12 Apr 2022 15:58:30 -0700
From:   Kevin Hilman <khilman@...nel.org>
To:     Tim Chang <jia-wei.chang@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Roger Lu <roger.lu@...iatek.com>,
        Jia-Wei Chang <jia-wei.chang@...iatek.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        hsinyi@...gle.com
Subject: Re: [PATCH 2/2] soc: mediatek: svs: add support for mt8186

Tim Chang <jia-wei.chang@...iatek.com> writes:

> From: Jia-Wei Chang <jia-wei.chang@...iatek.com>
>
> MT8186 svs has a number of banks which used as optimization of opp
> voltage table for corresponding dvfs drivers.
> MT8186 svs big core uses 2-line high bank and low bank to optimize the
> voltage of opp table for higher and lower frequency respectively.
>
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>

Theres' no upstream DTS for MT8186, so it's impossible for others to
test this.  Similar to my comments on other patches, could you please
explain how this was tested, and on what platforms.  If you have an
integration branch someplace that includes DTS, that would be very
helpful for reviewers to see the platform DTS that's used.

Most of the changes here seem to be conditional on the MT8186 bank data,
but there also appears to be changes that are common, and will affect
other SoCs.  Has this been tested with MT8183 to be sure these changes
don't break it?

Other than that, the code looks OK, but it would really good to see the
platform DTS that's used to enable this on MT8183 and MT8186.

Thanks,

Kevin


> ---
>  drivers/soc/mediatek/mtk-svs.c | 349 ++++++++++++++++++++++++++++++++-
>  1 file changed, 342 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> index 83af7ac8cafb..a44176125871 100644
> --- a/drivers/soc/mediatek/mtk-svs.c
> +++ b/drivers/soc/mediatek/mtk-svs.c
> @@ -356,6 +356,7 @@ struct svs_platform_data {
>   * @dcbdet: svs efuse data
>   * @dcmdet: svs efuse data
>   * @turn_pt: 2-line turn point tells which opp_volt calculated by high/low bank
> + * @vbin_turn_pt: voltage bin turn point helps to know which svsb_volt should be overridden
>   * @type: bank type to represent it is 2-line (high/low) bank or 1-line bank
>   *
>   * Svs bank will generate suitalbe voltages by below general math equation
> @@ -419,6 +420,7 @@ struct svs_bank {
>  	u32 dcbdet;
>  	u32 dcmdet;
>  	u32 turn_pt;
> +	u32 vbin_turn_pt;
>  	u32 type;
>  };
>  
> @@ -694,11 +696,12 @@ static int svs_status_debug_show(struct seq_file *m, void *v)
>  
>  	ret = thermal_zone_get_temp(svsb->tzd, &tzone_temp);
>  	if (ret)
> -		seq_printf(m, "%s: temperature ignore, turn_pt = %u\n",
> -			   svsb->name, svsb->turn_pt);
> +		seq_printf(m, "%s: temperature ignore, vbin_turn_pt = %u, turn_pt = %u\n",
> +			   svsb->name, svsb->vbin_turn_pt, svsb->turn_pt);
>  	else
> -		seq_printf(m, "%s: temperature = %d, turn_pt = %u\n",
> -			   svsb->name, tzone_temp, svsb->turn_pt);
> +		seq_printf(m, "%s: temperature = %d, vbin_turn_pt = %u, turn_pt = %u\n",
> +			   svsb->name, tzone_temp, svsb->vbin_turn_pt,
> +			   svsb->turn_pt);
>  
>  	for (i = 0; i < svsb->opp_count; i++) {
>  		opp = dev_pm_opp_find_freq_exact(svsb->opp_dev,
> @@ -891,9 +894,11 @@ static void svs_get_bank_volts_v3(struct svs_platform *svsp)
>  		opp_stop = svsb->opp_count;
>  	}
>  
> -	for (i = opp_start; i < opp_stop; i++)
> +	for (i = opp_start; i < opp_stop; i++) {
>  		if (svsb->volt_flags & SVSB_REMOVE_DVTFIXED_VOLT)
>  			svsb->volt[i] -= svsb->dvt_fixed;
> +		svsb->volt[i] += svsb->volt_od;
> +	}
>  }
>  
>  static void svs_set_bank_freq_pct_v3(struct svs_platform *svsp)
> @@ -984,6 +989,10 @@ static void svs_get_bank_volts_v2(struct svs_platform *svsp)
>  	struct svs_bank *svsb = svsp->pbank;
>  	u32 temp, i;
>  
> +	if (svsb->phase == SVSB_PHASE_MON &&
> +	    svsb->volt_flags & SVSB_MON_VOLT_IGNORE)
> +		return;
> +
>  	temp = svs_readl_relaxed(svsp, VOP74);
>  	svsb->volt[14] = (temp >> 24) & GENMASK(7, 0);
>  	svsb->volt[12] = (temp >> 16) & GENMASK(7, 0);
> @@ -1009,8 +1018,34 @@ static void svs_get_bank_volts_v2(struct svs_platform *svsp)
>  				     svsb->volt[14],
>  				     svsb->freq_pct[15]);
>  
> -	for (i = 0; i < svsb->opp_count; i++)
> +	for (i = 0; i < svsb->opp_count; i++) {
> +		if (svsb->volt_flags & SVSB_REMOVE_DVTFIXED_VOLT)
> +			svsb->volt[i] -= svsb->dvt_fixed;
>  		svsb->volt[i] += svsb->volt_od;
> +	}
> +
> +	/* For voltage bin support */
> +	if (svsb->opp_dfreq[0] > svsb->freq_base) {
> +		svsb->volt[0] = svs_opp_volt_to_bank_volt(svsb->opp_dvolt[0],
> +							  svsb->volt_step,
> +							  svsb->volt_base);
> +
> +		/* Find voltage bin turn point */
> +		for (i = 0; i < svsb->opp_count; i++) {
> +			if (svsb->opp_dfreq[i] <= svsb->freq_base) {
> +				svsb->vbin_turn_pt = i;
> +				break;
> +			}
> +		}
> +
> +		/* Override svs bank voltages */
> +		for (i = 1; i < svsb->vbin_turn_pt; i++)
> +			svsb->volt[i] =	interpolate(svsb->freq_pct[0],
> +						    svsb->freq_pct[svsb->vbin_turn_pt],
> +						    svsb->volt[0],
> +						    svsb->volt[svsb->vbin_turn_pt],
> +						    svsb->freq_pct[i]);
> +	}
>  }
>  
>  static void svs_set_bank_freq_pct_v2(struct svs_platform *svsp)
> @@ -1564,7 +1599,12 @@ static int svs_bank_resource_setup(struct svs_platform *svsp)
>  			svsb->name = "SVSB_CPU_LITTLE";
>  			break;
>  		case SVSB_CPU_BIG:
> -			svsb->name = "SVSB_CPU_BIG";
> +			if (svsb->type == SVSB_HIGH)
> +				svsb->name = "SVSB_CPU_BIG_HIGH";
> +			else if (svsb->type == SVSB_LOW)
> +				svsb->name = "SVSB_CPU_BIG_LOW";
> +			else
> +				svsb->name = "SVSB_CPU_BIG";
>  			break;
>  		case SVSB_CCI:
>  			svsb->name = "SVSB_CCI";
> @@ -1726,6 +1766,102 @@ static bool svs_mt8192_efuse_parsing(struct svs_platform *svsp)
>  	return true;
>  }
>  
> +static bool svs_mt8186_efuse_parsing(struct svs_platform *svsp)
> +{
> +	struct svs_bank *svsb;
> +	struct nvmem_cell *cell;
> +	u32 idx, i, golden_temp;
> +
> +	for (i = 0; i < svsp->efuse_max; i++)
> +		if (svsp->efuse[i])
> +			dev_info(svsp->dev, "M_HW_RES%d: 0x%08x\n",
> +				 i, svsp->efuse[i]);
> +
> +	if (!svsp->efuse[0]) {
> +		dev_notice(svsp->dev, "svs_efuse[0] = 0x0?\n");
> +		return false;
> +	}
> +
> +	/* Svs efuse parsing */
> +	for (idx = 0; idx < svsp->bank_max; idx++) {
> +		svsb = &svsp->banks[idx];
> +
> +		switch (svsb->sw_id) {
> +		case SVSB_CPU_BIG:
> +			if (svsb->type == SVSB_HIGH) {
> +				svsb->mdes = (svsp->efuse[2] >> 24) & GENMASK(7, 0);
> +				svsb->bdes = (svsp->efuse[2] >> 16) & GENMASK(7, 0);
> +				svsb->mtdes = svsp->efuse[2] & GENMASK(7, 0);
> +				svsb->dcmdet = (svsp->efuse[13] >> 8) & GENMASK(7, 0);
> +				svsb->dcbdet = svsp->efuse[13] & GENMASK(7, 0);
> +			} else if (svsb->type == SVSB_LOW) {
> +				svsb->mdes = (svsp->efuse[3] >> 24) & GENMASK(7, 0);
> +				svsb->bdes = (svsp->efuse[3] >> 16) & GENMASK(7, 0);
> +				svsb->mtdes = svsp->efuse[3] & GENMASK(7, 0);
> +				svsb->dcmdet = (svsp->efuse[14] >> 24) & GENMASK(7, 0);
> +				svsb->dcbdet = (svsp->efuse[14] >> 16) & GENMASK(7, 0);
> +			}
> +			break;
> +		case SVSB_CPU_LITTLE:
> +			svsb->mdes = (svsp->efuse[4] >> 24) & GENMASK(7, 0);
> +			svsb->bdes = (svsp->efuse[4] >> 16) & GENMASK(7, 0);
> +			svsb->mtdes = svsp->efuse[4] & GENMASK(7, 0);
> +			svsb->dcmdet = (svsp->efuse[14] >> 8) & GENMASK(7, 0);
> +			svsb->dcbdet = svsp->efuse[14] & GENMASK(7, 0);
> +			break;
> +		case SVSB_CCI:
> +			svsb->mdes = (svsp->efuse[5] >> 24) & GENMASK(7, 0);
> +			svsb->bdes = (svsp->efuse[5] >> 16) & GENMASK(7, 0);
> +			svsb->mtdes = svsp->efuse[5] & GENMASK(7, 0);
> +			svsb->dcmdet = (svsp->efuse[15] >> 24) & GENMASK(7, 0);
> +			svsb->dcbdet = (svsp->efuse[15] >> 16) & GENMASK(7, 0);
> +			break;
> +		case SVSB_GPU:
> +			svsb->mdes = (svsp->efuse[6] >> 24) & GENMASK(7, 0);
> +			svsb->bdes = (svsp->efuse[6] >> 16) & GENMASK(7, 0);
> +			svsb->mtdes = svsp->efuse[6] & GENMASK(7, 0);
> +			svsb->dcmdet = (svsp->efuse[15] >> 8) & GENMASK(7, 0);
> +			svsb->dcbdet = svsp->efuse[15] & GENMASK(7, 0);
> +			break;
> +		default:
> +			dev_err(svsb->dev, "unknown sw_id: %u\n", svsb->sw_id);
> +			return false;
> +		}
> +
> +		svsb->vmax += svsb->dvt_fixed;
> +	}
> +
> +	/* Thermal efuse parsing */
> +	cell = nvmem_cell_get(svsp->dev, "t-calibration-data");
> +	if (IS_ERR_OR_NULL(cell)) {
> +		dev_err(svsp->dev, "no thermal cell, no mon mode\n");
> +		return false;
> +	}
> +
> +	svsp->tefuse = nvmem_cell_read(cell, &svsp->tefuse_max);
> +	if (IS_ERR(svsp->tefuse)) {
> +		dev_err(svsp->dev, "cannot read thermal efuse: %ld\n",
> +			PTR_ERR(svsp->tefuse));
> +		nvmem_cell_put(cell);
> +		return false;
> +	}
> +
> +	svsp->tefuse_max /= sizeof(u32);
> +	nvmem_cell_put(cell);
> +
> +	golden_temp = (svsp->tefuse[0] >> 24) & GENMASK(7, 0);
> +	if (!golden_temp)
> +		golden_temp = 50;
> +
> +	for (idx = 0; idx < svsp->bank_max; idx++) {
> +		svsb = &svsp->banks[idx];
> +		svsb->mts = 409;
> +		svsb->bts = (((500 * golden_temp + 204650) / 1000) - 25) * 4;
> +	}
> +
> +	return true;
> +}
> +
>  static bool svs_mt8183_efuse_parsing(struct svs_platform *svsp)
>  {
>  	struct svs_bank *svsb;
> @@ -2041,6 +2177,49 @@ static int svs_mt8192_platform_probe(struct svs_platform *svsp)
>  	return 0;
>  }
>  
> +static int svs_mt8186_platform_probe(struct svs_platform *svsp)
> +{
> +	struct device *dev;
> +	struct svs_bank *svsb;
> +	u32 idx;
> +
> +	svsp->rst = devm_reset_control_get_optional(svsp->dev, "svs_rst");
> +	if (IS_ERR(svsp->rst)) {
> +		dev_err_probe(svsp->dev, PTR_ERR(svsp->rst),
> +			      "cannot get svs reset control\n");
> +		return PTR_ERR(svsp->rst);
> +	}
> +
> +	dev = svs_add_device_link(svsp, "lvts");
> +	if (IS_ERR(dev))
> +		return PTR_ERR(dev);
> +
> +	for (idx = 0; idx < svsp->bank_max; idx++) {
> +		svsb = &svsp->banks[idx];
> +
> +		switch (svsb->sw_id) {
> +		case SVSB_CPU_LITTLE:
> +		case SVSB_CPU_BIG:
> +			svsb->opp_dev = get_cpu_device(svsb->cpu_id);
> +			break;
> +		case SVSB_CCI:
> +			svsb->opp_dev = svs_add_device_link(svsp, "cci");
> +			break;
> +		case SVSB_GPU:
> +			svsb->opp_dev = svs_add_device_link(svsp, "mali");
> +			break;
> +		default:
> +			dev_err(svsb->dev, "unknown sw_id: %u\n", svsb->sw_id);
> +			return -EINVAL;
> +		}
> +
> +		if (IS_ERR(svsb->opp_dev))
> +			return PTR_ERR(svsb->opp_dev);
> +	}
> +
> +	return 0;
> +}
> +
>  static int svs_mt8183_platform_probe(struct svs_platform *svsp)
>  {
>  	struct device *dev;
> @@ -2135,6 +2314,149 @@ static struct svs_bank svs_mt8192_banks[] = {
>  	},
>  };
>  
> +static struct svs_bank svs_mt8186_banks[] = {
> +	{
> +		.sw_id			= SVSB_CPU_BIG,
> +		.type			= SVSB_LOW,
> +		.set_freq_pct		= svs_set_bank_freq_pct_v3,
> +		.get_volts		= svs_get_bank_volts_v3,
> +		.cpu_id			= 6,
> +		.volt_flags		= SVSB_REMOVE_DVTFIXED_VOLT,
> +		.mode_support		= SVSB_MODE_INIT02,
> +		.opp_count		= MAX_OPP_ENTRIES,
> +		.freq_base		= 1670000000,
> +		.turn_freq_base		= 1670000000,
> +		.volt_step		= 6250,
> +		.volt_base		= 400000,
> +		.volt_od		= 4,
> +		.vmax			= 0x59,
> +		.vmin			= 0x20,
> +		.age_config		= 0x1,
> +		.dc_config		= 0x1,
> +		.dvt_fixed		= 0x3,
> +		.vco			= 0x10,
> +		.chk_shift		= 0x87,
> +		.core_sel		= 0x0fff0100,
> +		.int_st			= BIT(0),
> +		.ctl0			= 0x00540003,
> +	},
> +	{
> +		.sw_id			= SVSB_CPU_BIG,
> +		.type			= SVSB_HIGH,
> +		.set_freq_pct		= svs_set_bank_freq_pct_v3,
> +		.get_volts		= svs_get_bank_volts_v3,
> +		.cpu_id			= 6,
> +		.tzone_name		= "cpu_big0",
> +		.volt_flags		= SVSB_REMOVE_DVTFIXED_VOLT |
> +					  SVSB_MON_VOLT_IGNORE,
> +		.mode_support		= SVSB_MODE_INIT02 | SVSB_MODE_MON,
> +		.opp_count		= MAX_OPP_ENTRIES,
> +		.freq_base		= 2050000000,
> +		.turn_freq_base		= 1670000000,
> +		.volt_step		= 6250,
> +		.volt_base		= 400000,
> +		.volt_od		= 4,
> +		.vmax			= 0x73,
> +		.vmin			= 0x20,
> +		.age_config		= 0x1,
> +		.dc_config		= 0x1,
> +		.dvt_fixed		= 0x6,
> +		.vco			= 0x10,
> +		.chk_shift		= 0x87,
> +		.core_sel		= 0x0fff0101,
> +		.int_st			= BIT(1),
> +		.ctl0			= 0x00540003,
> +		.tzone_htemp		= 85000,
> +		.tzone_htemp_voffset	= 8,
> +		.tzone_ltemp		= 25000,
> +		.tzone_ltemp_voffset	= 8,
> +	},
> +	{
> +		.sw_id			= SVSB_CPU_LITTLE,
> +		.set_freq_pct		= svs_set_bank_freq_pct_v2,
> +		.get_volts		= svs_get_bank_volts_v2,
> +		.cpu_id			= 0,
> +		.tzone_name		= "cpu_zone0",
> +		.volt_flags		= SVSB_REMOVE_DVTFIXED_VOLT |
> +					  SVSB_MON_VOLT_IGNORE,
> +		.mode_support		= SVSB_MODE_INIT02 | SVSB_MODE_MON,
> +		.opp_count		= MAX_OPP_ENTRIES,
> +		.freq_base		= 2000000000,
> +		.volt_step		= 6250,
> +		.volt_base		= 400000,
> +		.volt_od		= 3,
> +		.vmax			= 0x65,
> +		.vmin			= 0x20,
> +		.age_config		= 0x1,
> +		.dc_config		= 0x1,
> +		.dvt_fixed		= 0x6,
> +		.vco			= 0x10,
> +		.chk_shift		= 0x87,
> +		.core_sel		= 0x0fff0102,
> +		.int_st			= BIT(2),
> +		.ctl0			= 0x3210000f,
> +		.tzone_htemp		= 85000,
> +		.tzone_htemp_voffset	= 8,
> +		.tzone_ltemp		= 25000,
> +		.tzone_ltemp_voffset	= 8,
> +	},
> +	{
> +		.sw_id			= SVSB_CCI,
> +		.set_freq_pct		= svs_set_bank_freq_pct_v2,
> +		.get_volts		= svs_get_bank_volts_v2,
> +		.tzone_name		= "cpu_zone0",
> +		.volt_flags		= SVSB_REMOVE_DVTFIXED_VOLT |
> +					  SVSB_MON_VOLT_IGNORE,
> +		.mode_support		= SVSB_MODE_INIT02 | SVSB_MODE_MON,
> +		.opp_count		= MAX_OPP_ENTRIES,
> +		.freq_base		= 1400000000,
> +		.volt_step		= 6250,
> +		.volt_base		= 400000,
> +		.volt_od		= 3,
> +		.vmax			= 0x65,
> +		.vmin			= 0x20,
> +		.age_config		= 0x1,
> +		.dc_config		= 0x1,
> +		.dvt_fixed		= 0x6,
> +		.vco			= 0x10,
> +		.chk_shift		= 0x87,
> +		.core_sel		= 0x0fff0103,
> +		.int_st			= BIT(3),
> +		.ctl0			= 0x3210000f,
> +		.tzone_htemp		= 85000,
> +		.tzone_htemp_voffset	= 8,
> +		.tzone_ltemp		= 25000,
> +		.tzone_ltemp_voffset	= 8,
> +	},
> +	{
> +		.sw_id			= SVSB_GPU,
> +		.set_freq_pct		= svs_set_bank_freq_pct_v2,
> +		.get_volts		= svs_get_bank_volts_v2,
> +		.tzone_name		= "mfg",
> +		.volt_flags		= SVSB_REMOVE_DVTFIXED_VOLT |
> +					  SVSB_MON_VOLT_IGNORE,
> +		.mode_support		= SVSB_MODE_INIT02 | SVSB_MODE_MON,
> +		.opp_count		= MAX_OPP_ENTRIES,
> +		.freq_base		= 850000000,
> +		.volt_step		= 6250,
> +		.volt_base		= 400000,
> +		.vmax			= 0x58,
> +		.vmin			= 0x20,
> +		.age_config		= 0x555555,
> +		.dc_config		= 0x1,
> +		.dvt_fixed		= 0x4,
> +		.vco			= 0x10,
> +		.chk_shift		= 0x87,
> +		.core_sel		= 0x0fff0104,
> +		.int_st			= BIT(4),
> +		.ctl0			= 0x00100003,
> +		.tzone_htemp		= 85000,
> +		.tzone_htemp_voffset	= 8,
> +		.tzone_ltemp		= 25000,
> +		.tzone_ltemp_voffset	= 7,
> +	},
> +};
> +
>  static struct svs_bank svs_mt8183_banks[] = {
>  	{
>  		.sw_id			= SVSB_CPU_LITTLE,
> @@ -2249,6 +2571,16 @@ static const struct svs_platform_data svs_mt8192_platform_data = {
>  	.bank_max = ARRAY_SIZE(svs_mt8192_banks),
>  };
>  
> +static const struct svs_platform_data svs_mt8186_platform_data = {
> +	.name = "mt8186-svs",
> +	.banks = svs_mt8186_banks,
> +	.efuse_parsing = svs_mt8186_efuse_parsing,
> +	.probe = svs_mt8186_platform_probe,
> +	.irqflags = IRQF_TRIGGER_HIGH,
> +	.regs = svs_regs_v2,
> +	.bank_max = ARRAY_SIZE(svs_mt8186_banks),
> +};
> +
>  static const struct svs_platform_data svs_mt8183_platform_data = {
>  	.name = "mt8183-svs",
>  	.banks = svs_mt8183_banks,
> @@ -2263,6 +2595,9 @@ static const struct of_device_id svs_of_match[] = {
>  	{
>  		.compatible = "mediatek,mt8192-svs",
>  		.data = &svs_mt8192_platform_data,
> +	}, {
> +		.compatible = "mediatek,mt8186-svs",
> +		.data = &svs_mt8186_platform_data,
>  	}, {
>  		.compatible = "mediatek,mt8183-svs",
>  		.data = &svs_mt8183_platform_data,
> -- 
> 2.18.0

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