linux-kernel - [PATCH v4 08/15] PM / devfreq: rk3399_dmc: Use bitfield macro definitions for ODT

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Message-Id: <20220308110825.v4.8.I0f36da588afd01d0dc9ce5866240efa34bd91e21@changeid>
Date:   Tue,  8 Mar 2022 11:08:54 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Derek Basehore <dbasehore@...omium.org>,
        devicetree@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Lin Huang <hl@...k-chips.com>,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH v4 08/15] PM / devfreq: rk3399_dmc: Use bitfield macro definitions for ODT_PD

We're going to add new usages, and it's cleaner to work with macros
instead of comments and magic numbers.

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

(no changes since v1)

 drivers/devfreq/rk3399_dmc.c | 43 ++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 19 deletions(-)

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 8f447217303f..c4efbc15cbb1 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/arm-smccc.h>
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/devfreq.h>
@@ -23,6 +24,15 @@
 #include <soc/rockchip/rk3399_grf.h>
 #include <soc/rockchip/rockchip_sip.h>
 
+#define RK3399_SET_ODT_PD_0_SR_IDLE			GENMASK(7, 0)
+#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE		GENMASK(15, 8)
+#define RK3399_SET_ODT_PD_0_STANDBY_IDLE		GENMASK(31, 16)
+
+#define RK3399_SET_ODT_PD_1_PD_IDLE			GENMASK(11, 0)
+#define RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE		GENMASK(27, 16)
+
+#define RK3399_SET_ODT_PD_2_ODT_ENABLE			BIT(0)
+
 struct rk3399_dmcfreq {
 	struct device *dev;
 	struct devfreq *devfreq;
@@ -55,7 +65,6 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 	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);
@@ -72,8 +81,10 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 	mutex_lock(&dmcfreq->lock);
 
 	if (dmcfreq->regmap_pmu) {
+		unsigned int odt_pd_arg2 = 0;
+
 		if (target_rate >= dmcfreq->odt_dis_freq)
-			odt_enable = true;
+			odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;
 
 		/*
 		 * This makes a SMC call to the TF-A to set the DDR PD
@@ -83,7 +94,7 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 		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);
+			      odt_pd_arg2, 0, 0, 0, &res);
 	}
 
 	/*
@@ -316,23 +327,17 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 	/*
 	 * 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->sr_idle & 0xff) |
-			    ((data->sr_mc_gate_idle & 0xff) << 8) |
-			    ((data->standby_idle & 0xffff) << 16);
-	data->odt_pd_arg1 = (data->pd_idle & 0xfff) |
-			    ((data->srpd_lite_idle & 0xfff) << 16);
+	data->odt_pd_arg0 =
+		FIELD_PREP(RK3399_SET_ODT_PD_0_SR_IDLE, data->sr_idle) |
+		FIELD_PREP(RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE,
+			   data->sr_mc_gate_idle) |
+		FIELD_PREP(RK3399_SET_ODT_PD_0_STANDBY_IDLE,
+			   data->standby_idle);
+	data->odt_pd_arg1 =
+		FIELD_PREP(RK3399_SET_ODT_PD_1_PD_IDLE, data->pd_idle) |
+		FIELD_PREP(RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE,
+			   data->srpd_lite_idle);
 
 	/*
 	 * We add a devfreq driver to our parent since it has a device tree node
-- 
2.35.1.616.g0bdcbb4464-goog