On 25/05/2019 20:11, Martin Blumenstingl wrote:
> The PWM core already caches the "current struct pwm_state" as the
> "current state of the hardware registers" inside struct pwm_device.
>
> Drop the struct pwm_state from struct meson_pwm_channel in favour of the
> struct pwm_state in struct pwm_device. While here also drop any checks
> based on the pwm_state because the PWM core already takes care of this.
>
> No functional changes intended.
>
> Signed-off-by: Martin Blumenstingl <martin.blumensti...@googlemail.com>
> ---
> drivers/pwm/pwm-meson.c | 25 +------------------------
> 1 file changed, 1 insertion(+), 24 deletions(-)
>
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index 010212166d5d..900d362ec3c9 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -68,8 +68,6 @@ struct meson_pwm_channel {
> unsigned int lo;
> u8 pre_div;
>
> - struct pwm_state state;
> -
> struct clk *clk_parent;
> struct clk_mux mux;
> struct clk *clk;
> @@ -127,8 +125,6 @@ static int meson_pwm_request(struct pwm_chip *chip,
> struct pwm_device *pwm)
> return err;
> }
>
> - chip->ops->get_state(chip, pwm, &channel->state);
> -
> return pwm_set_chip_data(pwm, channel);
> }
>
> @@ -153,10 +149,6 @@ static int meson_pwm_calc(struct meson_pwm *meson,
> struct pwm_device *pwm,
> if (state->polarity == PWM_POLARITY_INVERSED)
> duty = period - duty;
>
> - if (period == channel->state.period &&
> - duty == channel->state.duty_cycle)
> - return 0;
> -
> fin_freq = clk_get_rate(channel->clk);
> if (fin_freq == 0) {
> dev_err(meson->chip.dev, "invalid source clock frequency\n");
> @@ -253,7 +245,6 @@ static void meson_pwm_disable(struct meson_pwm *meson,
> struct pwm_device *pwm)
> static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> struct pwm_state *state)
> {
> - struct meson_pwm_channel *channel = pwm_get_chip_data(pwm);
> struct meson_pwm *meson = to_meson_pwm(chip);
> int err = 0;
>
> @@ -262,26 +253,12 @@ static int meson_pwm_apply(struct pwm_chip *chip,
> struct pwm_device *pwm,
>
> if (!state->enabled) {
> meson_pwm_disable(meson, pwm);
> - channel->state.enabled = false;
> -
> - return 0;
> - }
> -
> - if (state->period != channel->state.period ||
> - state->duty_cycle != channel->state.duty_cycle ||
> - state->polarity != channel->state.polarity) {
> + } else {
> err = meson_pwm_calc(meson, pwm, state);
> if (err < 0)
> return err;
>
> - channel->state.polarity = state->polarity;
> - channel->state.period = state->period;
> - channel->state.duty_cycle = state->duty_cycle;
> - }
> -
> - if (state->enabled && !channel->state.enabled) {
> meson_pwm_enable(meson, pwm);
> - channel->state.enabled = true;
> }
>
> return 0;
>
Reviewed-by: Neil Armstrong <narmstr...@baylibre.com>
