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Subject[PATCH 1/2] drm/omap: panel-tpo-td028ttec1: add backlight support
Date
This panel has a backlight, so fetch it from devicetree using the
as documented in panel-common.txt. It is implemented the same way as in
panel-dpi.c
This ensures the backlight is also disabled when the display is
turned off like when doing xset dpms force off.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
.../gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
index 7ddc8c574a61..f326ba9dcf62 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
@@ -35,6 +35,8 @@ struct panel_drv_data {

struct videomode vm;

+ struct backlight_device *backlight;
+
struct spi_device *spi_dev;
};

@@ -268,6 +270,8 @@ static int td028ttec1_panel_enable(struct omap_dss_device *dssdev)

r |= jbt_ret_write_0(ddata, JBT_REG_DISPLAY_ON);

+ backlight_enable(ddata->backlight);
+
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

transfer_err:
@@ -283,6 +287,8 @@ static void td028ttec1_panel_disable(struct omap_dss_device *dssdev)
if (!omapdss_device_is_enabled(dssdev))
return;

+ backlight_disable(ddata->backlight);
+
dev_dbg(dssdev->dev, "td028ttec1_panel_disable()\n");

jbt_ret_write_0(ddata, JBT_REG_DISPLAY_OFF);
@@ -321,6 +327,15 @@ static int td028ttec1_panel_probe(struct spi_device *spi)

dev_dbg(&spi->dev, "%s\n", __func__);

+ ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
+ if (ddata == NULL)
+ return -ENOMEM;
+
+ ddata->backlight = devm_of_find_backlight(&spi->dev);
+
+ if (IS_ERR(ddata->backlight))
+ return PTR_ERR(ddata->backlight);
+
spi->bits_per_word = 9;
spi->mode = SPI_MODE_3;

@@ -330,9 +345,6 @@ static int td028ttec1_panel_probe(struct spi_device *spi)
return r;
}

- ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
- if (ddata == NULL)
- return -ENOMEM;

dev_set_drvdata(&spi->dev, ddata);

--
2.11.0
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