Messages in this thread Patch in this message | | | From | Jitao Shi <> | Subject | [PATCH v5 3/3] pwm: mtk_disp: implement atomic API .get_state() | Date | Wed, 16 Jun 2021 16:52:24 +0800 |
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Switch the driver to support the .get_state() method.
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com> --- drivers/pwm/pwm-mtk-disp.c | 39 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)
diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index a4766e931b68..d60a6b379683 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -159,8 +159,47 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } +static void mtk_disp_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); + u32 clk_div, con0, con1; + u64 rate, period, high_width; + 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: %pe\n", ERR_PTR(err)); + return; + } + err = clk_prepare_enable(mdp->clk_mm); + if (err < 0) { + dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err)); + clk_disable_unprepare(mdp->clk_main); + return; + } + } + rate = clk_get_rate(mdp->clk_main); + con0 = readl(mdp->base + mdp->data->con0); + con1 = readl(mdp->base + mdp->data->con1); + state->enabled = !!(con0 & BIT(0)); + clk_div = FIELD_GET(PWM_CLKDIV_MASK, con0); + period = con1 & PWM_PERIOD_MASK; + state->period = DIV64_U64_ROUND_UP(period * (clk_div + 1) * NSEC_PER_SEC, rate); + high_width = FIELD_GET(PWM_HIGH_WIDTH_MASK, con1); + state->duty_cycle = DIV64_U64_ROUND_UP(high_width * (clk_div + 1) * NSEC_PER_SEC, + rate); + if (!mdp->enabled) { + clk_disable_unprepare(mdp->clk_mm); + clk_disable_unprepare(mdp->clk_main); + } +} + static const struct pwm_ops mtk_disp_pwm_ops = { .apply = mtk_disp_pwm_apply, + .get_state = mtk_disp_pwm_get_state, .owner = THIS_MODULE, }; -- 2.25.1 | |