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video: ssd1307fb: Convert to atomic PWM API

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Use the atomic API wherever appropriate and get rid of pwm_apply_args()
call (the reference period and polarity are now explicitly set when
calling pwm_apply_state()).

We also make use of the pwm_set_relative_duty_cycle() helper to ease
relative to absolute duty_cycle conversion.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200324170532.44384-4-andriy.shevchenko@linux.intel.com
This commit is contained in:
Andy Shevchenko 2020-03-24 19:05:31 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 72915994e0
commit 479382360d
1 changed files with 5 additions and 12 deletions
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17
drivers/video/fbdev/ssd1307fb.c
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@ -79,7 +79,6 @@ struct ssd1307fb_par {
u32 prechargep1;
u32 prechargep2;
struct pwm_device *pwm;
u32 pwm_period;
struct gpio_desc *reset;
struct regulator *vbat_reg;
u32 vcomh;
@ -297,9 +296,9 @@ static void ssd1307fb_deferred_io(struct fb_info *info,
static int ssd1307fb_init(struct ssd1307fb_par *par)
{
struct pwm_state pwmstate;
int ret;
u32 precharge, dclk, com_invdir, compins;
struct pwm_args pargs;
if (par->device_info->need_pwm) {
par->pwm = pwm_get(&par->client->dev, NULL);
@ -308,21 +307,15 @@ static int ssd1307fb_init(struct ssd1307fb_par *par)
return PTR_ERR(par->pwm);
}
/*
* FIXME: pwm_apply_args() should be removed when switching to
* the atomic PWM API.
*/
pwm_apply_args(par->pwm);
pwm_init_state(par->pwm, &pwmstate);
pwm_set_relative_duty_cycle(&pwmstate, 50, 100);
pwm_apply_state(par->pwm, &pwmstate);
pwm_get_args(par->pwm, &pargs);
par->pwm_period = pargs.period;
/* Enable the PWM */
pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period);
pwm_enable(par->pwm);
dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n",
par->pwm->pwm, par->pwm_period);
par->pwm->pwm, pwm_get_period(par->pwm));
}
/* Set initial contrast */