diff mbox series

[V2,08/15] cpufreq: mediatek: Move voltage limits to platform data

Message ID 20220408045908.21671-9-rex-bc.chen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series cpufreq: mediatek: Cleanup and support MT8183 and MT8186 | expand

Commit Message

Rex-BC Chen (陳柏辰) April 8, 2022, 4:59 a.m. UTC 
From: Jia-Wei Chang <jia-wei.chang@mediatek.com>

Voltages and shifts are defined as macros originally.
There are different requirements of these values for each MediaTek SoCs.
Therefore, we add the platform data and move these values into it.

Signed-off-by: Jia-Wei Chang <jia-wei.chang@mediatek.com>
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
---
 drivers/cpufreq/mediatek-cpufreq.c | 90 ++++++++++++++++++++----------
 1 file changed, 61 insertions(+), 29 deletions(-)

Comments

AngeloGioacchino Del Regno April 8, 2022, 1:36 p.m. UTC | #1 
Il 08/04/22 06:59, Rex-BC Chen ha scritto:
> From: Jia-Wei Chang <jia-wei.chang@mediatek.com>
> 
> Voltages and shifts are defined as macros originally.
> There are different requirements of these values for each MediaTek SoCs.
> Therefore, we add the platform data and move these values into it.
> 
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@mediatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> ---
>   drivers/cpufreq/mediatek-cpufreq.c | 90 ++++++++++++++++++++----------
>   1 file changed, 61 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> index 1369da62780a..0be5609ee82e 100644
> --- a/drivers/cpufreq/mediatek-cpufreq.c
> +++ b/drivers/cpufreq/mediatek-cpufreq.c

..snip..

> @@ -625,20 +649,27 @@ static struct platform_driver mtk_cpufreq_platdrv = {
>   	.probe		= mtk_cpufreq_probe,
>   };
>   
> +static const struct mtk_cpufreq_platform_data mtk_platform_data = {

I would prefer if you name this after the oldest SoC that is supported in this
driver, or after the IP version.

Example: if the oldest one is mt7622, then this should be mt7622_platform_data;
          if newer SoCs have got a different cpu frequency control IP, then we
          should have here something like
          mtk_v1_platform_data, mtk_v1_3_platform_data.

Please note that I didn't check release dates, so my reference to mt7622 is
purely casual.

Regards,
Angelo
Rex-BC Chen (陳柏辰) April 11, 2022, 11:18 a.m. UTC | #2 
On Fri, 2022-04-08 at 15:36 +0200, AngeloGioacchino Del Regno wrote:
> Il 08/04/22 06:59, Rex-BC Chen ha scritto:
> > From: Jia-Wei Chang <jia-wei.chang@mediatek.com>
> > 
> > Voltages and shifts are defined as macros originally.
> > There are different requirements of these values for each MediaTek
> > SoCs.
> > Therefore, we add the platform data and move these values into it.
> > 
> > Signed-off-by: Jia-Wei Chang <jia-wei.chang@mediatek.com>
> > Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> > ---
> >   drivers/cpufreq/mediatek-cpufreq.c | 90 ++++++++++++++++++++-----
> > -----
> >   1 file changed, 61 insertions(+), 29 deletions(-)
> > 
> > diff --git a/drivers/cpufreq/mediatek-cpufreq.c
> > b/drivers/cpufreq/mediatek-cpufreq.c
> > index 1369da62780a..0be5609ee82e 100644
> > --- a/drivers/cpufreq/mediatek-cpufreq.c
> > +++ b/drivers/cpufreq/mediatek-cpufreq.c
> 
> ..snip..
> 
> > @@ -625,20 +649,27 @@ static struct platform_driver
> > mtk_cpufreq_platdrv = {
> >   	.probe		= mtk_cpufreq_probe,
> >   };
> >   
> > +static const struct mtk_cpufreq_platform_data mtk_platform_data =
> > {
> 
> I would prefer if you name this after the oldest SoC that is
> supported in this
> driver, or after the IP version.
> 
> Example: if the oldest one is mt7622, then this should be
> mt7622_platform_data;
>           if newer SoCs have got a different cpu frequency control
> IP, then we
>           should have here something like
>           mtk_v1_platform_data, mtk_v1_3_platform_data.
> 
> Please note that I didn't check release dates, so my reference to
> mt7622 is
> purely casual.
> 
> Regards,
> Angelo

Hello Angelo,

Thanks for your review.
I will rename it as mt2701_platform_data.

BRs,
Rex
diff mbox series

Patch

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 1369da62780a..0be5609ee82e 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -10,15 +10,21 @@ 
 #include <linux/cpumask.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_opp.h>
 #include <linux/regulator/consumer.h>
 
-#define MIN_VOLT_SHIFT		(100000)
-#define MAX_VOLT_SHIFT		(200000)
-#define MAX_VOLT_LIMIT		(1150000)
 #define VOLT_TOL		(10000)
 
+struct mtk_cpufreq_platform_data {
+	int min_volt_shift;
+	int max_volt_shift;
+	int proc_max_volt;
+	int sram_min_volt;
+	int sram_max_volt;
+};
+
 /*
  * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS
  * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in
@@ -46,8 +52,11 @@  struct mtk_cpu_dvfs_info {
 	struct notifier_block opp_nb;
 	int opp_cpu;
 	unsigned long opp_freq;
+	const struct mtk_cpufreq_platform_data *soc_data;
 };
 
+static struct platform_device *cpufreq_pdev;
+
 static LIST_HEAD(dvfs_info_list);
 
 static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
@@ -65,6 +74,7 @@  static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
 static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 					int new_vproc)
 {
+	const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
 	struct regulator *proc_reg = info->proc_reg;
 	struct regulator *sram_reg = info->sram_reg;
 	int old_vproc, old_vsram, new_vsram, vsram, vproc, ret;
@@ -75,7 +85,8 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 		return old_vproc;
 	}
 	/* Vsram should not exceed the maximum allowed voltage of SoC. */
-	new_vsram = min(new_vproc + MIN_VOLT_SHIFT, MAX_VOLT_LIMIT);
+	new_vsram = min(new_vproc + soc_data->min_volt_shift,
+			soc_data->sram_max_volt);
 
 	if (old_vproc < new_vproc) {
 		/*
@@ -98,10 +109,11 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 				return old_vproc;
 			}
 
-			vsram = min(new_vsram, old_vproc + MAX_VOLT_SHIFT);
+			vsram = min(new_vsram,
+				    old_vproc + soc_data->min_volt_shift);
 
-			if (vsram + VOLT_TOL >= MAX_VOLT_LIMIT) {
-				vsram = MAX_VOLT_LIMIT;
+			if (vsram + VOLT_TOL >= soc_data->sram_max_volt) {
+				vsram = soc_data->sram_max_volt;
 
 				/*
 				 * If the target Vsram hits the maximum voltage,
@@ -119,7 +131,7 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 				ret = regulator_set_voltage(sram_reg, vsram,
 							    vsram + VOLT_TOL);
 
-				vproc = vsram - MIN_VOLT_SHIFT;
+				vproc = vsram - soc_data->min_volt_shift;
 			}
 			if (ret)
 				return ret;
@@ -153,7 +165,8 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 				return old_vsram;
 			}
 
-			vproc = max(new_vproc, old_vsram - MAX_VOLT_SHIFT);
+			vproc = max(new_vproc,
+				    old_vsram - soc_data->max_volt_shift);
 			ret = regulator_set_voltage(proc_reg, vproc,
 						    vproc + VOLT_TOL);
 			if (ret)
@@ -162,10 +175,11 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 			if (vproc == new_vproc)
 				vsram = new_vsram;
 			else
-				vsram = max(new_vsram, vproc + MIN_VOLT_SHIFT);
+				vsram = max(new_vsram,
+					    vproc + soc_data->min_volt_shift);
 
-			if (vsram + VOLT_TOL >= MAX_VOLT_LIMIT) {
-				vsram = MAX_VOLT_LIMIT;
+			if (vsram + VOLT_TOL >= soc_data->sram_max_volt) {
+				vsram = soc_data->sram_max_volt;
 
 				/*
 				 * If the target Vsram hits the maximum voltage,
@@ -196,13 +210,14 @@  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
 
 static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)
 {
+	const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
 	int ret;
 
 	if (info->need_voltage_tracking)
 		ret = mtk_cpufreq_voltage_tracking(info, vproc);
 	else
 		ret = regulator_set_voltage(info->proc_reg, vproc,
-					    MAX_VOLT_LIMIT);
+					    soc_data->proc_max_volt);
 	if (!ret)
 		info->old_vproc = vproc;
 
@@ -576,9 +591,17 @@  static struct cpufreq_driver mtk_cpufreq_driver = {
 
 static int mtk_cpufreq_probe(struct platform_device *pdev)
 {
+	const struct of_device_id *match;
 	struct mtk_cpu_dvfs_info *info, *tmp;
 	int cpu, ret;
 
+	match = dev_get_platdata(&pdev->dev);
+	if (!match || !match->data) {
+		dev_err(&pdev->dev,
+			"failed to get mtk cpufreq platform data\n");
+		return -ENODEV;
+	}
+
 	for_each_possible_cpu(cpu) {
 		info = mtk_cpu_dvfs_info_lookup(cpu);
 		if (info)
@@ -590,6 +613,7 @@  static int mtk_cpufreq_probe(struct platform_device *pdev)
 			goto release_dvfs_info_list;
 		}
 
+		info->soc_data = match->data;
 		ret = mtk_cpu_dvfs_info_init(info, cpu);
 		if (ret) {
 			dev_err(&pdev->dev,
@@ -625,20 +649,27 @@  static struct platform_driver mtk_cpufreq_platdrv = {
 	.probe		= mtk_cpufreq_probe,
 };
 
+static const struct mtk_cpufreq_platform_data mtk_platform_data = {
+	.min_volt_shift = 100000,
+	.max_volt_shift = 200000,
+	.proc_max_volt = 1150000,
+	.sram_min_volt = 0,
+	.sram_max_volt = 1150000,
+};
+
 /* List of machines supported by this driver */
 static const struct of_device_id mtk_cpufreq_machines[] __initconst = {
-	{ .compatible = "mediatek,mt2701", },
-	{ .compatible = "mediatek,mt2712", },
-	{ .compatible = "mediatek,mt7622", },
-	{ .compatible = "mediatek,mt7623", },
-	{ .compatible = "mediatek,mt8167", },
-	{ .compatible = "mediatek,mt817x", },
-	{ .compatible = "mediatek,mt8173", },
-	{ .compatible = "mediatek,mt8176", },
-	{ .compatible = "mediatek,mt8183", },
-	{ .compatible = "mediatek,mt8365", },
-	{ .compatible = "mediatek,mt8516", },
-
+	{ .compatible = "mediatek,mt2701", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt2712", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt7622", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt7623", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8167", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt817x", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8173", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8176", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8183", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8365", .data = &mtk_platform_data },
+	{ .compatible = "mediatek,mt8516", .data = &mtk_platform_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
@@ -647,7 +678,6 @@  static int __init mtk_cpufreq_driver_init(void)
 {
 	struct device_node *np;
 	const struct of_device_id *match;
-	struct platform_device *pdev;
 	int err;
 
 	np = of_find_node_by_path("/");
@@ -671,11 +701,12 @@  static int __init mtk_cpufreq_driver_init(void)
 	 * and the device registration codes are put here to handle defer
 	 * probing.
 	 */
-	pdev = platform_device_register_simple("mtk-cpufreq", -1, NULL, 0);
-	if (IS_ERR(pdev)) {
+	cpufreq_pdev = platform_device_register_data(NULL, "mtk-cpufreq", -1,
+						     match, sizeof(*match));
+	if (IS_ERR(cpufreq_pdev)) {
 		pr_err("failed to register mtk-cpufreq platform device\n");
 		platform_driver_unregister(&mtk_cpufreq_platdrv);
-		return PTR_ERR(pdev);
+		return PTR_ERR(cpufreq_pdev);
 	}
 
 	return 0;
@@ -684,6 +715,7 @@  module_init(mtk_cpufreq_driver_init)
 
 static void __exit mtk_cpufreq_driver_exit(void)
 {
+	platform_device_unregister(cpufreq_pdev);
 	platform_driver_unregister(&mtk_cpufreq_platdrv);
 }
 module_exit(mtk_cpufreq_driver_exit)