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Subject[PATCH v3 09/15] PM / devfreq: rk3399_dmc: Support new disable-freq properties
Date
Implement the newly-defined properties to allow disabling certain
power-saving-at-idle features at higher frequencies.

This is a rewritten version of work by Lin Huang <hl@rock-chips.com>.

Signed-off-by: Brian Norris <briannorris@chromium.org>
---

(no changes since v1)

drivers/devfreq/rk3399_dmc.c | 51 +++++++++++++++++++++++++++++++++---
1 file changed, 47 insertions(+), 4 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index c4efbc15cbb1..fc740c1f6747 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -55,6 +55,12 @@ struct rk3399_dmcfreq {
unsigned int ddr3_odt_dis_freq;
unsigned int lpddr3_odt_dis_freq;
unsigned int lpddr4_odt_dis_freq;
+
+ unsigned int pd_idle_dis_freq;
+ unsigned int sr_idle_dis_freq;
+ unsigned int sr_mc_gate_idle_dis_freq;
+ unsigned int srpd_lite_idle_dis_freq;
+ unsigned int standby_idle_dis_freq;
};

static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
@@ -81,8 +87,25 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
mutex_lock(&dmcfreq->lock);

if (dmcfreq->regmap_pmu) {
+ unsigned int odt_pd_arg0 = dmcfreq->odt_pd_arg0;
+ unsigned int odt_pd_arg1 = dmcfreq->odt_pd_arg1;
unsigned int odt_pd_arg2 = 0;

+ if (target_rate >= dmcfreq->sr_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;
+
+ if (target_rate >= dmcfreq->sr_mc_gate_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE;
+
+ if (target_rate >= dmcfreq->standby_idle_dis_freq)
+ odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_STANDBY_IDLE;
+
+ if (target_rate >= dmcfreq->pd_idle_dis_freq)
+ odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_PD_IDLE;
+
+ if (target_rate >= dmcfreq->srpd_lite_idle_dis_freq)
+ odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE;
+
if (target_rate >= dmcfreq->odt_dis_freq)
odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;

@@ -91,10 +114,9 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
* (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_pd_arg2, 0, 0, 0, &res);
+ arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, odt_pd_arg0, odt_pd_arg1,
+ ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, odt_pd_arg2,
+ 0, 0, 0, &res);
}

/*
@@ -230,6 +252,16 @@ static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
{
int ret = 0;

+ /*
+ * These are all optional, and serve as minimum bounds. Give them large
+ * (i.e., never "disabled") values if the DT doesn't specify one.
+ */
+ data->pd_idle_dis_freq =
+ data->sr_idle_dis_freq =
+ data->sr_mc_gate_idle_dis_freq =
+ data->srpd_lite_idle_dis_freq =
+ data->standby_idle_dis_freq = UINT_MAX;
+
ret |= of_property_read_u32(np, "rockchip,pd_idle",
&data->pd_idle);
ret |= of_property_read_u32(np, "rockchip,sr_idle",
@@ -247,6 +279,17 @@ static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
&data->lpddr4_odt_dis_freq);

+ ret |= of_property_read_u32(np, "rockchip,pd-idle-dis-freq-hz",
+ &data->pd_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,sr-idle-dis-freq-hz",
+ &data->sr_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-dis-freq-hz",
+ &data->sr_mc_gate_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-dis-freq-hz",
+ &data->srpd_lite_idle_dis_freq);
+ ret |= of_property_read_u32(np, "rockchip,standby-idle-dis-freq-hz",
+ &data->standby_idle_dis_freq);
+
return ret;
}

--
2.35.1.616.g0bdcbb4464-goog
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