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pwm: imx: Move PWMv2 software reset code to a separate function 

The software reset code has been extracted from imx_pwm_config_v2 function
and moved to new one - imx_pwm_sw_reset().

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>
This commit is contained in:
Lukasz Majewski 2017-01-29 22:54:09 +01:00 committed by Thierry Reding
parent b3c088fe02
commit 970247a486
1 changed files with 21 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/pwm/pwm-imx.c
View File

@ -119,6 +119,25 @@ static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
clk_disable_unprepare(imx->clk_per);
}
static void imx_pwm_sw_reset(struct pwm_chip *chip)
{
struct imx_chip *imx = to_imx_chip(chip);
struct device *dev = chip->dev;
int wait_count = 0;
u32 cr;
writel(MX3_PWMCR_SWR, imx->mmio_base + MX3_PWMCR);
do {
usleep_range(200, 1000);
cr = readl(imx->mmio_base + MX3_PWMCR);
} while ((cr & MX3_PWMCR_SWR) &&
(wait_count++ < MX3_PWM_SWR_LOOP));
if (cr & MX3_PWMCR_SWR)
dev_warn(dev, "software reset timeout\n");
}
static int imx_pwm_config_v2(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
@ -128,7 +147,7 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
unsigned long period_cycles, duty_cycles, prescale;
unsigned int period_ms;
bool enable = pwm_is_enabled(pwm);
int wait_count = 0, fifoav;
int fifoav;
u32 cr, sr;
/*
@ -151,15 +170,7 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
dev_warn(dev, "there is no free FIFO slot\n");
}
} else {
writel(MX3_PWMCR_SWR, imx->mmio_base + MX3_PWMCR);
do {
usleep_range(200, 1000);
cr = readl(imx->mmio_base + MX3_PWMCR);
} while ((cr & MX3_PWMCR_SWR) &&
(wait_count++ < MX3_PWM_SWR_LOOP));
if (cr & MX3_PWMCR_SWR)
dev_warn(dev, "software reset timeout\n");
imx_pwm_sw_reset(chip);
}
c = clk_get_rate(imx->clk_per);