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Date: Mon, 24 Apr 2017 12:01:08 +0200
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Thierry Reding <thierry.reding@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Kamil Debski <kamil@...as.org>
Cc: Tomasz Figa <tomasz.figa@...il.com>, linux-pwm@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, b.zolnierkie@...sung.com
Subject: [PATCH v2 2/3] pwm: pwm-samsung: fix suspend/resume support
Fix suspend/resume support:
- add disabled_mask to struct samsung_pwm_chip to track PWM
disabled state information in pwm_samsung_{disable,enable}()
- rename pwm_samsung_config() to __pwm_samsung_config() and
add extra force_period parameter to be used during resume
(to force tin_ns and tcnt recalculation)
- add pwm_samsung_config() wrapper for preserving old behavior
- properly restore PWM configuration in pwm_samsung_resume()
- remove no longer needed pwm_samsung_suspend()
- update Copyrights
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
drivers/pwm/pwm-samsung.c | 67 +++++++++++++++++++++++++----------------------
1 file changed, 35 insertions(+), 32 deletions(-)
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index 9ea7638..062f2cf 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -3,6 +3,7 @@
* Copyright (c) 2008 Simtec Electronics
* Ben Dooks <ben@...tec.co.uk>, <ben-linux@...ff.org>
* Copyright (c) 2013 Tomasz Figa <tomasz.figa@...il.com>
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
*
* PWM driver for Samsung SoCs
*
@@ -74,6 +75,7 @@ struct samsung_pwm_channel {
* @chip: generic PWM chip
* @variant: local copy of hardware variant data
* @inverter_mask: inverter status for all channels - one bit per channel
+ * @disabled_mask: disabled status for all channels - one bit per channel
* @base: base address of mapped PWM registers
* @base_clk: base clock used to drive the timers
* @tclk0: external clock 0 (can be ERR_PTR if not present)
@@ -83,6 +85,7 @@ struct samsung_pwm_chip {
struct pwm_chip chip;
struct samsung_pwm_variant variant;
u8 inverter_mask;
+ u8 disabled_mask;
void __iomem *base;
struct clk *base_clk;
@@ -257,6 +260,8 @@ static int pwm_samsung_enable(struct pwm_chip *chip, struct pwm_device *pwm)
tcon |= TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan);
writel(tcon, our_chip->base + REG_TCON);
+ our_chip->disabled_mask &= ~BIT(pwm->hwpwm);
+
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
return 0;
@@ -275,6 +280,8 @@ static void pwm_samsung_disable(struct pwm_chip *chip, struct pwm_device *pwm)
tcon &= ~TCON_AUTORELOAD(tcon_chan);
writel(tcon, our_chip->base + REG_TCON);
+ our_chip->disabled_mask |= BIT(pwm->hwpwm);
+
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -297,8 +304,8 @@ static void pwm_samsung_manual_update(struct samsung_pwm_chip *chip,
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
-static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
- int duty_ns, int period_ns)
+static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns, bool force_period)
{
struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
struct samsung_pwm_channel *chan = pwm_get_chip_data(pwm);
@@ -319,7 +326,7 @@ static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
++tcnt;
/* Check to see if we are changing the clock rate of the PWM. */
- if (chan->period_ns != period_ns) {
+ if (chan->period_ns != period_ns || force_period) {
unsigned long tin_rate;
u32 period;
@@ -378,6 +385,12 @@ static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
+static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ return __pwm_samsung_config(chip, pwm, duty_ns, period_ns, false);
+}
+
static void pwm_samsung_set_invert(struct samsung_pwm_chip *chip,
unsigned int channel, bool invert)
{
@@ -589,51 +602,41 @@ static int pwm_samsung_remove(struct platform_device *pdev)
}
#ifdef CONFIG_PM_SLEEP
-static int pwm_samsung_suspend(struct device *dev)
+static int pwm_samsung_resume(struct device *dev)
{
- struct samsung_pwm_chip *chip = dev_get_drvdata(dev);
+ struct samsung_pwm_chip *our_chip = dev_get_drvdata(dev);
+ struct pwm_chip *chip = &our_chip->chip;
unsigned int i;
- /*
- * No one preserves these values during suspend so reset them.
- * Otherwise driver leaves PWM unconfigured if same values are
- * passed to pwm_config() next time.
- */
- for (i = 0; i < SAMSUNG_PWM_NUM; ++i) {
- struct pwm_device *pwm = &chip->chip.pwms[i];
+ for (i = 0; i < SAMSUNG_PWM_NUM; i++) {
+ struct pwm_device *pwm = &chip->pwms[i];
struct samsung_pwm_channel *chan = pwm_get_chip_data(pwm);
if (!chan)
continue;
- chan->period_ns = 0;
- chan->duty_ns = 0;
- }
-
- return 0;
-}
+ if (our_chip->variant.output_mask & BIT(i))
+ pwm_samsung_set_invert(our_chip, i,
+ our_chip->inverter_mask & BIT(i));
-static int pwm_samsung_resume(struct device *dev)
-{
- struct samsung_pwm_chip *chip = dev_get_drvdata(dev);
- unsigned int chan;
+ if (chan->period_ns) {
+ __pwm_samsung_config(chip, pwm, chan->duty_ns,
+ chan->period_ns, true);
+ /* needed to make PWM disable work on Odroid-XU3 */
+ pwm_samsung_manual_update(our_chip, pwm);
+ }
- /*
- * Inverter setting must be preserved across suspend/resume
- * as nobody really seems to configure it more than once.
- */
- for (chan = 0; chan < SAMSUNG_PWM_NUM; ++chan) {
- if (chip->variant.output_mask & BIT(chan))
- pwm_samsung_set_invert(chip, chan,
- chip->inverter_mask & BIT(chan));
+ if (our_chip->disabled_mask & BIT(i))
+ pwm_samsung_disable(chip, pwm);
+ else
+ pwm_samsung_enable(chip, pwm);
}
return 0;
}
#endif
-static SIMPLE_DEV_PM_OPS(pwm_samsung_pm_ops, pwm_samsung_suspend,
- pwm_samsung_resume);
+static SIMPLE_DEV_PM_OPS(pwm_samsung_pm_ops, NULL, pwm_samsung_resume);
static struct platform_driver pwm_samsung_driver = {
.driver = {
--
1.9.1
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