It is usually possible to configure the polarity, cycle and duty all at once,
so that the polarity and cycle and duty should be binding together. Move it
into rockchip_pwm_config(), as well as prepared for the next atomic update
commit.
Signed-off-by: David Wu <david.wu@xxxxxxxxxxxxxx>
---
drivers/pwm/pwm-rockchip.c | 46 ++++++++++++++++++++++++----------------------
1 file changed, 24 insertions(+), 22 deletions(-)
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index 12e7b4a8..83703e1 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -27,6 +27,7 @@
#define PWM_DUTY_NEGATIVE (0 << 3)
#define PWM_INACTIVE_NEGATIVE (0 << 4)
#define PWM_INACTIVE_POSITIVE (1 << 4)
+#define PWM_POLARITY_MASK (PWM_DUTY_POSITIVE | PWM_INACTIVE_POSITIVE)
#define PWM_OUTPUT_LEFT (0 << 5)
#define PWM_LP_DISABLE (0 << 8)
@@ -122,12 +123,13 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip,
clk_disable(pc->pclk);
}
-static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
- int duty_ns, int period_ns)
+static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state, bool polarity)
{
struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
unsigned long period, duty;
u64 clk_rate, div;
+ u32 ctrl;
clk_rate = clk_get_rate(pc->clk);
@@ -136,21 +138,32 @@ static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* bits, every possible input period can be obtained using the
* default prescaler value for all practical clock rate values.
*/
- div = clk_rate * period_ns;
+ div = clk_rate * state->period;
period = DIV_ROUND_CLOSEST_ULL(div,
pc->data->prescaler * NSEC_PER_SEC);
- div = clk_rate * duty_ns;
+ div = clk_rate * state->duty_cycle;
duty = DIV_ROUND_CLOSEST_ULL(div, pc->data->prescaler * NSEC_PER_SEC);
writel(period, pc->base + pc->data->regs.period);
writel(duty, pc->base + pc->data->regs.duty);
+
+ ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl);
+ if (polarity) {
+ ctrl &= ~PWM_POLARITY_MASK;
+ if (state->polarity == PWM_POLARITY_INVERSED)
+ ctrl |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSITIVE;
+ else
+ ctrl |= PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE;
+ }
+ writel(ctrl, pc->base + pc->data->regs.ctrl);
+
+ return 0;
}
static int rockchip_pwm_enable(struct pwm_chip *chip,
struct pwm_device *pwm,
bool enable,
- enum pwm_polarity polarity,
u32 enable_conf)
{
struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
@@ -163,15 +176,6 @@ static int rockchip_pwm_enable(struct pwm_chip *chip,
return ret;
}
- if (pc->data->supports_polarity) {
- if (polarity == PWM_POLARITY_INVERSED)
- enable_conf |= PWM_DUTY_NEGATIVE |
- PWM_INACTIVE_POSITIVE;
- else
- enable_conf |= PWM_DUTY_POSITIVE |
- PWM_INACTIVE_NEGATIVE;
- }
-
val = readl_relaxed(pc->base + pc->data->regs.ctrl);
if (enable)
@@ -199,17 +203,16 @@ static int rockchip_pwm_apply_v1(struct pwm_chip *chip, struct pwm_device *pwm,
enabled = curstate.enabled;
if (state->polarity != curstate.polarity && enabled) {
- ret = rockchip_pwm_enable(chip, pwm, false, state->polarity,
- enable_conf);
+ ret = rockchip_pwm_enable(chip, pwm, false, enable_conf);
if (ret)
return ret;
enabled = false;
}
- rockchip_pwm_config(chip, pwm, state->duty_cycle, state->period);
+ rockchip_pwm_config(chip, pwm, state, false);
if (state->enabled != enabled)
ret = rockchip_pwm_enable(chip, pwm, state->enabled,
- state->polarity, enable_conf);
+ enable_conf);
return ret;
}
@@ -227,17 +230,16 @@ static int rockchip_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
enabled = curstate.enabled;
if (state->polarity != curstate.polarity && enabled) {
- ret = rockchip_pwm_enable(chip, pwm, false, state->polarity,
- enable_conf);
+ ret = rockchip_pwm_enable(chip, pwm, false, enable_conf);
if (ret)
return ret;
enabled = false;
}
- rockchip_pwm_config(chip, pwm, state->duty_cycle, state->period);
+ rockchip_pwm_config(chip, pwm, state, true);
if (state->enabled != enabled)
ret = rockchip_pwm_enable(chip, pwm, state->enabled,
- state->polarity, enable_conf);
+ enable_conf);
return ret;
}
--
1.9.1
--
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