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Date:   Fri, 3 May 2019 09:38:54 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Gaël PORTAY <gael.portay@...labora.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Lin Huang <hl@...k-chips.com>,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        Derek Basehore <dbasehore@...omium.org>,
        Randy Li <ayaka@...lik.info>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     Mark Rutland <mark.rutland@....com>, kernel@...labora.com
Subject: Re: [PATCH v5 3/6] devfreq: rk3399_dmc: Pass ODT and auto power
 down parameters to TF-A.

Hi 

Also, this patch was applied to linux-pm.git for for v5.2-rc1.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=bleeding-edge&id=adfe3b76608ffe547af5a74415f15499b798f32a

On 19. 5. 3. 오전 2:58, Gaël PORTAY wrote:
> From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> 
> Trusted Firmware-A (TF-A) for rk3399 implements a SiP call to get the
> on-die termination (ODT) and auto power down parameters from kernel,
> this patch adds the functionality to do this. Also, if DDR clock
> frequency is lower than the on-die termination (ODT) disable frequency
> this driver should disable the DDR ODT.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>
> Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> ---
> 
> Changes in v5: None
> 
> Changes in v4:
> - [PATCH v3 3/5] Add Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>.
> 
> Changes in v3:
> - [PATCH v2 3/5] Add Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>.
> 		 Remove comments.
> 		 Move pmu dt parsing after dt-parsing of timings to fix
> 		  data->odt_dis_freq value.
> 
> Changes in v2: None
> 
> Changes in v1:
> - [RFC 3/10] Add an explanation for platform SIP calls.
> - [RFC 3/10] Change if statement for a switch.
> - [RFC 3/10] Rename ddr_flag to odt_enable to be more clear.
> 
>  drivers/devfreq/rk3399_dmc.c        | 71 ++++++++++++++++++++++++++++-
>  include/soc/rockchip/rockchip_sip.h |  1 +
>  2 files changed, 71 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
> index e795ad2b3f6b..daf19e121c99 100644
> --- a/drivers/devfreq/rk3399_dmc.c
> +++ b/drivers/devfreq/rk3399_dmc.c
> @@ -18,14 +18,17 @@
>  #include <linux/devfreq.h>
>  #include <linux/devfreq-event.h>
>  #include <linux/interrupt.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_opp.h>
> +#include <linux/regmap.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/rwsem.h>
>  #include <linux/suspend.h>
>  
> +#include <soc/rockchip/rk3399_grf.h>
>  #include <soc/rockchip/rockchip_sip.h>
>  
>  struct dram_timing {
> @@ -69,8 +72,11 @@ struct rk3399_dmcfreq {
>  	struct mutex lock;
>  	struct dram_timing timing;
>  	struct regulator *vdd_center;
> +	struct regmap *regmap_pmu;
>  	unsigned long rate, target_rate;
>  	unsigned long volt, target_volt;
> +	unsigned int odt_dis_freq;
> +	int odt_pd_arg0, odt_pd_arg1;
>  };
>  
>  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
> @@ -80,6 +86,8 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
>  	struct dev_pm_opp *opp;
>  	unsigned long old_clk_rate = dmcfreq->rate;
>  	unsigned long target_volt, target_rate;
> +	struct arm_smccc_res res;
> +	bool odt_enable = false;
>  	int err;
>  
>  	opp = devfreq_recommended_opp(dev, freq, flags);
> @@ -95,6 +103,19 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
>  
>  	mutex_lock(&dmcfreq->lock);
>  
> +	if (target_rate >= dmcfreq->odt_dis_freq)
> +		odt_enable = true;
> +
> +	/*
> +	 * This makes a SMC call to the TF-A to set the DDR PD (power-down)
> +	 * timings and to enable or disable the ODT (on-die termination)
> +	 * resistors.
> +	 */
> +	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
> +		      dmcfreq->odt_pd_arg1,
> +		      ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
> +		      odt_enable, 0, 0, 0, &res);
> +
>  	/*
>  	 * If frequency scaling from low to high, adjust voltage first.
>  	 * If frequency scaling from high to low, adjust frequency first.
> @@ -294,11 +315,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>  {
>  	struct arm_smccc_res res;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *np = pdev->dev.of_node, *node;
>  	struct rk3399_dmcfreq *data;
>  	int ret, index, size;
>  	uint32_t *timing;
>  	struct dev_pm_opp *opp;
> +	u32 ddr_type;
> +	u32 val;
>  
>  	data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
>  	if (!data)
> @@ -354,10 +377,56 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	node = of_parse_phandle(np, "rockchip,pmu", 0);
> +	if (node) {
> +		data->regmap_pmu = syscon_node_to_regmap(node);
> +		if (IS_ERR(data->regmap_pmu))
> +			return PTR_ERR(data->regmap_pmu);
> +	}
> +
> +	regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
> +	ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
> +		    RK3399_PMUGRF_DDRTYPE_MASK;
> +
> +	switch (ddr_type) {
> +	case RK3399_PMUGRF_DDRTYPE_DDR3:
> +		data->odt_dis_freq = data->timing.ddr3_odt_dis_freq;
> +		break;
> +	case RK3399_PMUGRF_DDRTYPE_LPDDR3:
> +		data->odt_dis_freq = data->timing.lpddr3_odt_dis_freq;
> +		break;
> +	case RK3399_PMUGRF_DDRTYPE_LPDDR4:
> +		data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
> +		break;
> +	default:
> +		return -EINVAL;
> +	};
> +
>  	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
>  		      ROCKCHIP_SIP_CONFIG_DRAM_INIT,
>  		      0, 0, 0, 0, &res);
>  
> +	/*
> +	 * In TF-A there is a platform SIP call to set the PD (power-down)
> +	 * timings and to enable or disable the ODT (on-die termination).
> +	 * This call needs three arguments as follows:
> +	 *
> +	 * arg0:
> +	 *     bit[0-7]   : sr_idle
> +	 *     bit[8-15]  : sr_mc_gate_idle
> +	 *     bit[16-31] : standby idle
> +	 * arg1:
> +	 *     bit[0-11]  : pd_idle
> +	 *     bit[16-27] : srpd_lite_idle
> +	 * arg2:
> +	 *     bit[0]     : odt enable
> +	 */
> +	data->odt_pd_arg0 = (data->timing.sr_idle & 0xff) |
> +			    ((data->timing.sr_mc_gate_idle & 0xff) << 8) |
> +			    ((data->timing.standby_idle & 0xffff) << 16);
> +	data->odt_pd_arg1 = (data->timing.pd_idle & 0xfff) |
> +			    ((data->timing.srpd_lite_idle & 0xfff) << 16);
> +
>  	/*
>  	 * We add a devfreq driver to our parent since it has a device tree node
>  	 * with operating points.
> diff --git a/include/soc/rockchip/rockchip_sip.h b/include/soc/rockchip/rockchip_sip.h
> index 7e28092c4d3d..ad9482c56797 100644
> --- a/include/soc/rockchip/rockchip_sip.h
> +++ b/include/soc/rockchip/rockchip_sip.h
> @@ -23,5 +23,6 @@
>  #define ROCKCHIP_SIP_CONFIG_DRAM_GET_RATE	0x05
>  #define ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ	0x06
>  #define ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM	0x07
> +#define ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD	0x08
>  
>  #endif
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics

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