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OMAP: DSS2: Taal: Add panel hardware reset

Browse source 
Issue a proper reset pulse on the reset line instead of just doing power
on/off.

Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Jani Nikula 2010-04-09 12:25:59 +03:00 committed by Tomi Valkeinen
parent 1cbc8703e1
commit 006db7b430
1 changed files with 40 additions and 4 deletions
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44
drivers/video/omap2/displays/panel-taal.c
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@ -490,6 +490,22 @@ static struct attribute_group taal_attr_group = {
.attrs = taal_attrs,
};
static void taal_hw_reset(struct omap_dss_device *dssdev)
{
if (dssdev->reset_gpio == -1)
return;
gpio_set_value(dssdev->reset_gpio, 1);
udelay(10);
/* reset the panel */
gpio_set_value(dssdev->reset_gpio, 0);
/* assert reset for at least 10us */
udelay(10);
gpio_set_value(dssdev->reset_gpio, 1);
/* wait 5ms after releasing reset */
msleep(5);
}
static int taal_probe(struct omap_dss_device *dssdev)
{
struct backlight_properties props;
@ -527,6 +543,8 @@ static int taal_probe(struct omap_dss_device *dssdev)
dev_set_drvdata(&dssdev->dev, td);
taal_hw_reset(dssdev);
/* if no platform set_backlight() defined, presume DSI backlight
* control */
memset(&props, 0, sizeof(struct backlight_properties));
@ -628,6 +646,9 @@ static void taal_remove(struct omap_dss_device *dssdev)
cancel_delayed_work_sync(&td->esd_work);
destroy_workqueue(td->esd_wq);
/* reset, to be sure that the panel is in a valid state */
taal_hw_reset(dssdev);
kfree(td);
}
@ -654,6 +675,8 @@ static int taal_power_on(struct omap_dss_device *dssdev)
goto err0;
}
taal_hw_reset(dssdev);
omapdss_dsi_vc_enable_hs(TCH, false);
r = taal_sleep_out(td);
@ -704,6 +727,10 @@ static int taal_power_on(struct omap_dss_device *dssdev)
return 0;
err:
dev_err(&dssdev->dev, "error while enabling panel, issuing HW reset\n");
taal_hw_reset(dssdev);
omapdss_dsi_display_disable(dssdev);
err0:
dsi_bus_unlock();
@ -716,16 +743,24 @@ err0:
static void taal_power_off(struct omap_dss_device *dssdev)
{
struct taal_data *td = dev_get_drvdata(&dssdev->dev);
int r;
dsi_bus_lock();
cancel_delayed_work(&td->esd_work);
taal_dcs_write_0(DCS_DISPLAY_OFF);
taal_sleep_in(td);
r = taal_dcs_write_0(DCS_DISPLAY_OFF);
if (!r) {
r = taal_sleep_in(td);
/* wait a bit so that the message goes through */
msleep(10);
}
/* wait a bit so that the message goes through */
msleep(10);
if (r) {
dev_err(&dssdev->dev,
"error disabling panel, issuing HW reset\n");
taal_hw_reset(dssdev);
}
omapdss_dsi_display_disable(dssdev);
@ -1186,6 +1221,7 @@ err:
dev_err(&dssdev->dev, "performing LCD reset\n");
taal_power_off(dssdev);
taal_hw_reset(dssdev);
taal_power_on(dssdev);
dsi_bus_unlock();