diff options
| author | Lukasz Majewski <l.majewski@majess.pl> | 2017-01-29 22:54:10 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2017-01-30 09:12:48 +0100 |
| commit | 73b1ff1f3e5ccc22b31fa44c98460ef05393181c (patch) | |
| tree | 2e48d869a804b72317316bb4b22b503f1b4a9f2f /drivers/pwm | |
| parent | pwm: imx: Move PWMv2 software reset code to a separate function (diff) | |
| download | linux-73b1ff1f3e5ccc22b31fa44c98460ef05393181c.tar.xz linux-73b1ff1f3e5ccc22b31fa44c98460ef05393181c.zip | |
pwm: imx: Move PWMv2 wait for fifo slot code to a separate function
The code, which waits for fifo slot, has been extracted from
imx_pwm_config_v2 function and moved to new one - imx_pwm_wait_fifo_slot().
This change reduces the overall size of imx_pwm_config_v2() and prepares
it for atomic PWM operation.
Suggested-by: Stefan Agner <stefan@agner.ch>
Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 43 |
1 files changed, 25 insertions, 18 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index c944f15f574c..d557279446ed 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -137,18 +137,36 @@ static void imx_pwm_sw_reset(struct pwm_chip *chip) dev_warn(dev, "software reset timeout\n"); } +static void imx_pwm_wait_fifo_slot(struct pwm_chip *chip, + struct pwm_device *pwm) +{ + struct imx_chip *imx = to_imx_chip(chip); + struct device *dev = chip->dev; + unsigned int period_ms; + int fifoav; + u32 sr; + + sr = readl(imx->mmio_base + MX3_PWMSR); + fifoav = sr & MX3_PWMSR_FIFOAV_MASK; + if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) { + period_ms = DIV_ROUND_UP(pwm_get_period(pwm), + NSEC_PER_MSEC); + msleep(period_ms); + + sr = readl(imx->mmio_base + MX3_PWMSR); + if (fifoav == (sr & MX3_PWMSR_FIFOAV_MASK)) + dev_warn(dev, "there is no free FIFO slot\n"); + } +} static int imx_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct imx_chip *imx = to_imx_chip(chip); - struct device *dev = chip->dev; unsigned long long c; unsigned long period_cycles, duty_cycles, prescale; - unsigned int period_ms; bool enable = pwm_is_enabled(pwm); - int fifoav; - u32 cr, sr; + u32 cr; /* * i.MX PWMv2 has a 4-word sample FIFO. @@ -157,21 +175,10 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, * wait for a full PWM cycle to get a relinquished FIFO slot * when the controller is enabled and the FIFO is fully loaded. */ - if (enable) { - sr = readl(imx->mmio_base + MX3_PWMSR); - fifoav = sr & MX3_PWMSR_FIFOAV_MASK; - if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) { - period_ms = DIV_ROUND_UP(pwm_get_period(pwm), - NSEC_PER_MSEC); - msleep(period_ms); - - sr = readl(imx->mmio_base + MX3_PWMSR); - if (fifoav == (sr & MX3_PWMSR_FIFOAV_MASK)) - dev_warn(dev, "there is no free FIFO slot\n"); - } - } else { + if (enable) + imx_pwm_wait_fifo_slot(chip, pwm); + else imx_pwm_sw_reset(chip); - } c = clk_get_rate(imx->clk_per); c = c * period_ns; |