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Message-ID: <20210603100531.161901-2-jitao.shi@mediatek.com>
Date: Thu, 3 Jun 2021 18:05:29 +0800
From: Jitao Shi <jitao.shi@...iatek.com>
To: Thierry Reding <thierry.reding@...il.com>,
Matthias Brugger <matthias.bgg@...il.com>
CC: <linux-pwm@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
<yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
<cawa.cheng@...iatek.com>, <bibby.hsieh@...iatek.com>,
<ck.hu@...iatek.com>, <stonea168@....com>,
<huijuan.xie@...iatek.com>, Jitao Shi <jitao.shi@...iatek.com>
Subject: [PATCH v4 1/3] pwm: mtk-disp: adjust the clocks to avoid them mismatch
The clk_main and clk_mm clocks are still on when system enter
suspend. That will casue the power consumption.
The clocks call the clk_prepare() in probe(), but the clk_unprepare()
is called in remove(), it isn't called when system suspend.
Remove the clcok opterations from probe() and remove.
Add the clk_prepare_enable() in config().
Add the clk_disable_unprepare() in disable().
Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
---
drivers/pwm/pwm-mtk-disp.c | 81 ++++++++++++++++----------------------
1 file changed, 33 insertions(+), 48 deletions(-)
diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index 9b3ba401a3db..b5771e2c54b8 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -47,6 +47,7 @@ struct mtk_disp_pwm {
struct clk *clk_main;
struct clk *clk_mm;
void __iomem *base;
+ bool enabled;
};
static inline struct mtk_disp_pwm *to_mtk_disp_pwm(struct pwm_chip *chip)
@@ -74,6 +75,22 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
u64 div, rate;
int err;
+ if (!mdp->enabled) {
+ err = clk_prepare_enable(mdp->clk_main);
+ if (err < 0) {
+ dev_err(chip->dev, "Can't enable mdp->clk_main: %d\n",
+ err);
+ return err;
+ }
+ err = clk_prepare_enable(mdp->clk_mm);
+ if (err < 0) {
+ dev_err(chip->dev, "Can't enable mdp->clk_mm: %d\n",
+ err);
+ clk_disable_unprepare(mdp->clk_main);
+ return err;
+ }
+ }
+
/*
* Find period, high_width and clk_div to suit duty_ns and period_ns.
* Calculate proper div value to keep period value in the bound.
@@ -87,9 +104,15 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
rate = clk_get_rate(mdp->clk_main);
clk_div = div_u64(rate * period_ns, NSEC_PER_SEC) >>
PWM_PERIOD_BIT_WIDTH;
- if (clk_div > PWM_CLKDIV_MAX)
+ if (clk_div > PWM_CLKDIV_MAX) {
+ dev_err(chip->dev, "clock rate is too high: rate = %d Hz\n",
+ rate);
+ if (!mdp->enabled) {
+ clk_disable_unprepare(mdp->clk_mm);
+ clk_disable_unprepare(mdp->clk_main);
+ }
return -EINVAL;
-
+ }
div = NSEC_PER_SEC * (clk_div + 1);
period = div64_u64(rate * period_ns, div);
if (period > 0)
@@ -98,16 +121,6 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
high_width = div64_u64(rate * duty_ns, div);
value = period | (high_width << PWM_HIGH_WIDTH_SHIFT);
- err = clk_enable(mdp->clk_main);
- if (err < 0)
- return err;
-
- err = clk_enable(mdp->clk_mm);
- if (err < 0) {
- clk_disable(mdp->clk_main);
- return err;
- }
-
mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
PWM_CLKDIV_MASK,
clk_div << PWM_CLKDIV_SHIFT);
@@ -124,9 +137,6 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
0x0);
}
- clk_disable(mdp->clk_mm);
- clk_disable(mdp->clk_main);
-
return 0;
}
@@ -135,18 +145,9 @@ static int mtk_disp_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
int err;
- err = clk_enable(mdp->clk_main);
- if (err < 0)
- return err;
-
- err = clk_enable(mdp->clk_mm);
- if (err < 0) {
- clk_disable(mdp->clk_main);
- return err;
- }
-
mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,
mdp->data->enable_mask);
+ mdp->enabled = true;
return 0;
}
@@ -158,8 +159,11 @@ static void mtk_disp_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,
0x0);
- clk_disable(mdp->clk_mm);
- clk_disable(mdp->clk_main);
+ if (mdp->enabled) {
+ clk_disable_unprepare(mdp->clk_mm);
+ clk_disable_unprepare(mdp->clk_main);
+ }
+ mdp->enabled = false;
}
static const struct pwm_ops mtk_disp_pwm_ops = {
@@ -192,14 +196,6 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
if (IS_ERR(mdp->clk_mm))
return PTR_ERR(mdp->clk_mm);
- ret = clk_prepare(mdp->clk_main);
- if (ret < 0)
- return ret;
-
- ret = clk_prepare(mdp->clk_mm);
- if (ret < 0)
- goto disable_clk_main;
-
mdp->chip.dev = &pdev->dev;
mdp->chip.ops = &mtk_disp_pwm_ops;
mdp->chip.npwm = 1;
@@ -207,7 +203,7 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
ret = pwmchip_add(&mdp->chip);
if (ret < 0) {
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
- goto disable_clk_mm;
+ return ret;
}
platform_set_drvdata(pdev, mdp);
@@ -226,24 +222,13 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
}
return 0;
-
-disable_clk_mm:
- clk_unprepare(mdp->clk_mm);
-disable_clk_main:
- clk_unprepare(mdp->clk_main);
- return ret;
}
static int mtk_disp_pwm_remove(struct platform_device *pdev)
{
struct mtk_disp_pwm *mdp = platform_get_drvdata(pdev);
- int ret;
-
- ret = pwmchip_remove(&mdp->chip);
- clk_unprepare(mdp->clk_mm);
- clk_unprepare(mdp->clk_main);
- return ret;
+ return pwmchip_remove(&mdp->chip);
}
static const struct mtk_pwm_data mt2701_pwm_data = {
--
2.25.1
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