diff options
| -rw-r--r-- | drivers/pwm/pwm-lpss-pci.c | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-lpss-platform.c | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-lpss.c | 19 | ||||
| -rw-r--r-- | drivers/pwm/pwm-lpss.h | 1 |
4 files changed, 16 insertions, 6 deletions
diff --git a/drivers/pwm/pwm-lpss-pci.c b/drivers/pwm/pwm-lpss-pci.c index 073dfb2337e0..c1527cb645be 100644 --- a/drivers/pwm/pwm-lpss-pci.c +++ b/drivers/pwm/pwm-lpss-pci.c @@ -36,6 +36,7 @@ static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { .clk_rate = 19200000, .npwm = 4, .base_unit_bits = 22, + .bypass = true, }; /* Tangier */ diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c index b22b6fdadb9a..5d6ed1507d29 100644 --- a/drivers/pwm/pwm-lpss-platform.c +++ b/drivers/pwm/pwm-lpss-platform.c @@ -37,6 +37,7 @@ static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { .clk_rate = 19200000, .npwm = 4, .base_unit_bits = 22, + .bypass = true, }; static int pwm_lpss_probe_platform(struct platform_device *pdev) diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c index 689d2c1cbead..8db0d40ccacd 100644 --- a/drivers/pwm/pwm-lpss.c +++ b/drivers/pwm/pwm-lpss.c @@ -57,7 +57,7 @@ static inline void pwm_lpss_write(const struct pwm_device *pwm, u32 value) writel(value, lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM); } -static int pwm_lpss_update(struct pwm_device *pwm) +static int pwm_lpss_wait_for_update(struct pwm_device *pwm) { struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip); const void __iomem *addr = lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM; @@ -65,8 +65,6 @@ static int pwm_lpss_update(struct pwm_device *pwm) u32 val; int err; - pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE); - /* * PWM Configuration register has SW_UPDATE bit that is set when a new * configuration is written to the register. The bit is automatically @@ -122,6 +120,12 @@ static void pwm_lpss_prepare(struct pwm_lpss_chip *lpwm, struct pwm_device *pwm, pwm_lpss_write(pwm, ctrl); } +static inline void pwm_lpss_cond_enable(struct pwm_device *pwm, bool cond) +{ + if (cond) + pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE); +} + static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { @@ -137,18 +141,21 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } pwm_lpss_prepare(lpwm, pwm, state->duty_cycle, state->period); - ret = pwm_lpss_update(pwm); + pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE); + pwm_lpss_cond_enable(pwm, lpwm->info->bypass == false); + ret = pwm_lpss_wait_for_update(pwm); if (ret) { pm_runtime_put(chip->dev); return ret; } - pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE); + pwm_lpss_cond_enable(pwm, lpwm->info->bypass == true); } else { ret = pwm_lpss_is_updating(pwm); if (ret) return ret; pwm_lpss_prepare(lpwm, pwm, state->duty_cycle, state->period); - return pwm_lpss_update(pwm); + pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE); + return pwm_lpss_wait_for_update(pwm); } } else if (pwm_is_enabled(pwm)) { pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE); diff --git a/drivers/pwm/pwm-lpss.h b/drivers/pwm/pwm-lpss.h index c94cd7c2695d..98306bb02cfe 100644 --- a/drivers/pwm/pwm-lpss.h +++ b/drivers/pwm/pwm-lpss.h @@ -22,6 +22,7 @@ struct pwm_lpss_boardinfo { unsigned long clk_rate; unsigned int npwm; unsigned long base_unit_bits; + bool bypass; }; struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r, |