Re: [PATCH 3/4] devfreq: exynos4: Add ppmu's clock control and code clean about regulator control

Chanwoo Choi
2014-03-13T04:20:13Z

Hi Bartlomiej,

On 03/13/2014 11:15 AM, Chanwoo Choi wrote:
> Hi Batlomiej,
>
> On 03/13/2014 12:17 AM, Bartlomiej Zolnierkiewicz wrote:
>>
>> Hi,
>>
>> On Wednesday, March 12, 2014 08:48:01 PM Chanwoo Choi wrote:
>>> There are not the clock controller of ppmudmc0/1. This patch control the clock
>>> of ppmudmc0/1 which is used for monitoring memory bus utilization.
>>>
>>> Also, this patch code clean about regulator control and free resource
>>> when calling exit/remove function.
>>>
>>> For example,
>>> busfreq@106A0000 {
>>> compatible = "samsung,exynos4x12-busfreq";
>>>
>>> /* Clock for PPMUDMC0/1 */
>>> clocks = <&clock CLK_PPMUDMC0>, <&clock CLK_PPMUDMC1>;
>>> clock-names = "ppmudmc0", "ppmudmc1";
>>>
>>> /* Regulator for MIF/INT block */
>>> vdd_mif-supply = <&buck1_reg>;
>>> vdd_int-supply = <&buck3_reg>;
>>> };
>>
>> This should be in Documentation/devicetree/bindings/ documentation.
>
> OK, I will add documentation about it.
>
>>
>>> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
>>> ---
>>> drivers/devfreq/exynos/exynos4_bus.c | 107 ++++++++++++++++++++++++++++++-----
>>> 1 file changed, 93 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c
>>> index 16fb3cb..0c5b99e 100644
>>> --- a/drivers/devfreq/exynos/exynos4_bus.c
>>> +++ b/drivers/devfreq/exynos/exynos4_bus.c
>>> @@ -62,6 +62,11 @@ enum exynos_ppmu_idx {
>>> PPMU_END,
>>> };
>>>
>>> +static const char *exynos_ppmu_clk_name[] = {
>>> + [PPMU_DMC0] = "ppmudmc0",
>>> + [PPMU_DMC1] = "ppmudmc1",
>>> +};
>>> +
>>> #define EX4210_LV_MAX LV_2
>>> #define EX4x12_LV_MAX LV_4
>>> #define EX4210_LV_NUM (LV_2 + 1)
>>> @@ -86,6 +91,7 @@ struct busfreq_data {
>>> struct regulator *vdd_mif; /* Exynos4412/4212 only */
>>> struct busfreq_opp_info curr_oppinfo;
>>> struct exynos_ppmu ppmu[PPMU_END];
>>> + struct clk *clk_ppmu[PPMU_END];
>>>
>>> struct notifier_block pm_notifier;
>>> struct mutex lock;
>>> @@ -722,8 +728,26 @@ static int exynos4_bus_get_dev_status(struct device *dev,
>>> static void exynos4_bus_exit(struct device *dev)
>>> {
>>> struct busfreq_data *data = dev_get_drvdata(dev);
>>> + int i;
>>>
>>> - devfreq_unregister_opp_notifier(dev, data->devfreq);
>>> + /*
>>> + * Un-map memory man and disable regulator/clocks
>>> + * to prevent power leakage.
>>> + */
>>> + regulator_disable(data->vdd_int);
>>> + if (data->type == TYPE_BUSF_EXYNOS4x12)
>>> + regulator_disable(data->vdd_mif);
>>> +
>>> + for (i = 0; i < PPMU_END; i++) {
>>> + if (data->clk_ppmu[i])
>>> + clk_disable_unprepare(data->clk_ppmu[i]);
>>> + }
>>> +
>>> + for (i = 0; i < PPMU_END; i++) {
>>> + if (data->ppmu[i].hw_base)
>>> + iounmap(data->ppmu[i].hw_base);
>>> +
>>> + }
>>> }
>>>
>>> static struct devfreq_dev_profile exynos4_devfreq_profile = {
>>> @@ -987,6 +1011,7 @@ static int exynos4_busfreq_parse_dt(struct busfreq_data *data)
>>> {
>>> struct device *dev = data->dev;
>>> struct device_node *np = dev->of_node;
>>> + const char **clk_name = exynos_ppmu_clk_name;
>>> int i, ret;
>>>
>>> if (!np) {
>>> @@ -1005,8 +1030,67 @@ static int exynos4_busfreq_parse_dt(struct busfreq_data *data)
>>> }
>>> }
>>>
>>> + /*
>>> + * Get PPMU's clocks to control them. But, if PPMU's clocks
>>> + * is default 'pass' state, this driver don't need control
>>> + * PPMU's clock.
>>> + */
>>> + for (i = 0; i < PPMU_END; i++) {
>>> + data->clk_ppmu[i] = devm_clk_get(dev, clk_name[i]);
>>> + if (IS_ERR_OR_NULL(data->clk_ppmu[i])) {
>>> + dev_warn(dev, "Cannot get %s clock\n", clk_name[i]);
>>> + data->clk_ppmu[i] = NULL;
>>> + }
>>> +
>>> + ret = clk_prepare_enable(data->clk_ppmu[i]);
>>> + if (ret < 0) {
>>> + dev_warn(dev, "Cannot enable %s clock\n", clk_name[i]);
>>> + data->clk_ppmu[i] = NULL;
>>> + goto err_clocks;
>>> + }
>>> + }
>>> +
>>> +
>>> + /* Get regulators to control voltage of int/mif block */
>>> + data->vdd_int = devm_regulator_get(dev, "vdd_int");
>>> + if (IS_ERR(data->vdd_int)) {
>>> + dev_err(dev, "Failed to get the regulator of vdd_int\n");
>>> + ret = PTR_ERR(data->vdd_int);
>>> + goto err_clocks;
>>> + }
>>> + ret = regulator_enable(data->vdd_int);
>>> + if (ret < 0) {
>>> + dev_err(dev, "Failed to enable regulator of vdd_int\n");
>>> + goto err_clocks;
>>> + }
>>> +
>>> + switch (data->type) {
>>> + case TYPE_BUSF_EXYNOS4x12:
>>> + data->vdd_mif = devm_regulator_get(dev, "vdd_mif");
>>> + if (IS_ERR(data->vdd_mif)) {
>>> + dev_err(dev, "Failed to get the regulator vdd_mif\n");
>>> + ret = PTR_ERR(data->vdd_mif);
>>> + goto err_clocks;
>>
>> This won't disable vdd_int regulator.
>
> I don't understand. This patch contro/enable always vdd_int regualor as following:
> >> + data->vdd_int = devm_regulator_get(dev, "vdd_int");
> >> + ret = regulator_enable(data->vdd_int);
> You can check this code on this patch. upper
>
>>
>>> + }
>>> + ret = regulator_enable(data->vdd_mif);
>>> + if (ret < 0) {
>>> + dev_err(dev, "Failed to enable regulator of vdd_mif\n");
>>> + goto err_clocks;
>>
>> ditto
>
>>
>>> + }
>>> + break;
>>> + case TYPE_BUSF_EXYNOS4210:
>>> + default:
>>> + dev_err(data->dev, "Unknown device type\n");
>>> + return -EINVAL;
>>
>> This looks very wrong for Exynos4210.
>
> What is wrong for Exynos4210?
> Always, exynos4210/exynos4x12 control vdd_int regulator uppper this patch.

It is my mistake. I'll modify it.

Best Regards,
Chanwoo Choi