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Message-ID: <b7daf957-1dd3-3045-4752-fc6a01b9821b@samsung.com>
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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