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Signed-off-by: Rex-BC Chen Signed-off-by: Jitao Shi Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/pwm/pwm-mtk-disp.c | 114 +++++++++++++++++++------------------ 1 file changed, 58 insertions(+), 56 deletions(-) diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index 21416a8b6b47..502228adf718 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -20,6 +20,7 @@ #define PWM_CLKDIV_SHIFT 16 #define PWM_CLKDIV_MAX 0x3ff #define PWM_CLKDIV_MASK (PWM_CLKDIV_MAX << PWM_CLKDIV_SHIFT) +#define PWM_POLARITY BIT(2) #define PWM_PERIOD_BIT_WIDTH 12 #define PWM_PERIOD_MASK ((1 << PWM_PERIOD_BIT_WIDTH) - 1) @@ -47,6 +48,7 @@ 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) @@ -66,11 +68,11 @@ static void mtk_disp_pwm_update_bits(struct mtk_disp_pwm *mdp, u32 offset, writel(value, address); } -static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, - int duty_ns, int period_ns) +static int mtk_disp_pwm_enable(struct pwm_chip *chip, + const struct pwm_state *state) { struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); - u32 clk_div, period, high_width, value; + u32 clk_div, period, high_width, value, polarity; u64 div, rate; int err; @@ -84,33 +86,47 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * period = (PWM_CLK_RATE * period_ns) / (10^9 * (clk_div + 1)) - 1 * high_width = (PWM_CLK_RATE * duty_ns) / (10^9 * (clk_div + 1)) */ + 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; + } + } rate = clk_get_rate(mdp->clk_main); - clk_div = div_u64(rate * period_ns, NSEC_PER_SEC) >> + clk_div = div_u64(rate * state->period, 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); + 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); + period = div64_u64(rate * state->period, div); if (period > 0) period--; - high_width = div64_u64(rate * duty_ns, div); + high_width = div64_u64(rate * state->duty_cycle, 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; - } + polarity = 0; + if (state->polarity == PWM_POLARITY_INVERSED) + polarity = PWM_POLARITY; mtk_disp_pwm_update_bits(mdp, mdp->data->con0, PWM_CLKDIV_MASK, clk_div << PWM_CLKDIV_SHIFT); + mtk_disp_pwm_update_bits(mdp, mdp->data->con0, + PWM_POLARITY, polarity); mtk_disp_pwm_update_bits(mdp, mdp->data->con1, PWM_PERIOD_MASK | PWM_HIGH_WIDTH_MASK, value); @@ -122,50 +138,49 @@ static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, mtk_disp_pwm_update_bits(mdp, mdp->data->commit, mdp->data->commit_mask, 0x0); + } else { + mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug, + mdp->data->bls_debug_mask, + mdp->data->bls_debug_mask); + mtk_disp_pwm_update_bits(mdp, mdp->data->con0, + mdp->data->con0_sel, + mdp->data->con0_sel); } - clk_disable(mdp->clk_mm); - clk_disable(mdp->clk_main); - + mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, + mdp->data->enable_mask); + mdp->enabled = true; return 0; } -static int mtk_disp_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +static int mtk_disp_pwm_disable(struct pwm_chip *chip, + const struct pwm_state *state) { 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, + 0x0); + if (mdp->enabled) { + clk_disable_unprepare(mdp->clk_mm); + clk_disable_unprepare(mdp->clk_main); } - mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, - mdp->data->enable_mask); + mdp->enabled = false; return 0; } -static void mtk_disp_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) { - struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); + if (!state->enabled) + return mtk_disp_pwm_disable(chip, state); - mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, - 0x0); - - clk_disable(mdp->clk_mm); - clk_disable(mdp->clk_main); + return mtk_disp_pwm_enable(chip, state); } static const struct pwm_ops mtk_disp_pwm_ops = { - .config = mtk_disp_pwm_config, - .enable = mtk_disp_pwm_enable, - .disable = mtk_disp_pwm_disable, + .apply = mtk_disp_pwm_apply, .owner = THIS_MODULE, }; @@ -205,19 +220,6 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, mdp); - /* - * For MT2701, disable double buffer before writing register - * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH. - */ - if (!mdp->data->has_commit) { - mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug, - mdp->data->bls_debug_mask, - mdp->data->bls_debug_mask); - mtk_disp_pwm_update_bits(mdp, mdp->data->con0, - mdp->data->con0_sel, - mdp->data->con0_sel); - } - return 0; }