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drm/panel: simple: handle small delay durations more precisely

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Since msleep is based on jiffies the panel could take longer
than expected. So use msleep for values greater than 20 msec
otherwise usleep_range.

Change-Id: Ib03c6e381b44a31dd57aeaaa3a88a459578de313
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2018-08-08 09:12:34 +08:00
parent 405fb07849
commit 91a8fbc44b
1 changed files with 15 additions and 7 deletions
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22
drivers/gpu/drm/panel/panel-simple.c
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@@ -124,6 +124,14 @@ static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
return container_of(panel, struct panel_simple, base);
}
static void panel_simple_sleep(unsigned int msec)
{
if (msec > 20)
msleep(msec);
else
usleep_range(msec * 1000, (msec + 1) * 1000);
}
static int panel_simple_parse_cmd_seq(struct device *dev,
const u8 *data, int length,
struct panel_cmd_seq *seq)
@@ -211,7 +219,7 @@ static int panel_simple_xfer_cmd_seq(struct panel_simple *panel,
}
if (header->delay)
msleep(header->delay);
panel_simple_sleep(header->delay);
}
return 0;
@@ -351,7 +359,7 @@ static int panel_simple_disable(struct drm_panel *panel)
}
if (p->desc->delay.disable)
msleep(p->desc->delay.disable);
panel_simple_sleep(p->desc->delay.disable);
p->enabled = false;
@@ -375,7 +383,7 @@ static int panel_simple_unprepare(struct drm_panel *panel)
panel_simple_regulator_disable(p);
if (p->desc->delay.unprepare)
msleep(p->desc->delay.unprepare);
panel_simple_sleep(p->desc->delay.unprepare);
p->prepared = false;
@@ -399,17 +407,17 @@ static int panel_simple_prepare(struct drm_panel *panel)
gpiod_direction_output(p->enable_gpio, 1);
if (p->desc->delay.prepare)
msleep(p->desc->delay.prepare);
panel_simple_sleep(p->desc->delay.prepare);
gpiod_direction_output(p->reset_gpio, 1);
if (p->desc->delay.reset)
msleep(p->desc->delay.reset);
panel_simple_sleep(p->desc->delay.reset);
gpiod_direction_output(p->reset_gpio, 0);
if (p->desc->delay.init)
msleep(p->desc->delay.init);
panel_simple_sleep(p->desc->delay.init);
if (p->desc->init_seq)
panel_simple_xfer_cmd_seq(p, p->desc->init_seq);
@@ -427,7 +435,7 @@ static int panel_simple_enable(struct drm_panel *panel)
return 0;
if (p->desc->delay.enable)
msleep(p->desc->delay.enable);
panel_simple_sleep(p->desc->delay.enable);
if (p->backlight) {
p->backlight->props.state &= ~BL_CORE_FBBLANK;