The patch does not re-execute the hardware initialization/activation
procedure for the panel if it is already operational.
This feature is crucial when supporting the simple framebuffer, as the
controller has already been initialized by the bootloader.
Co-developed-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/panel/panel-synaptics-r63353.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panel/panel-synaptics-r63353.c b/drivers/gpu/drm/panel/panel-synaptics-r63353.c
index 169c629746c7..93e3ed545b34 100644
--- a/drivers/gpu/drm/panel/panel-synaptics-r63353.c
+++ b/drivers/gpu/drm/panel/panel-synaptics-r63353.c
@@ -258,6 +258,8 @@ static int r63353_panel_probe(struct mipi_dsi_device *dsi)
int ret = 0;
struct device *dev = &dsi->dev;
struct r63353_panel *panel;
+ bool initialized;
+ enum gpiod_flags rflags;
panel = devm_kzalloc(&dsi->dev, sizeof(*panel), GFP_KERNEL);
if (!panel)
@@ -282,7 +284,9 @@ static int r63353_panel_probe(struct mipi_dsi_device *dsi)
if (IS_ERR(panel->avdd))
return PTR_ERR(panel->avdd);
- panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ initialized = of_property_read_bool(dev->of_node, "syna,boot-on");
+ rflags = initialized ? GPIOD_ASIS : GPIOD_OUT_LOW;
+ panel->reset_gpio = devm_gpiod_get(dev, "reset", rflags);
if (IS_ERR(panel->reset_gpio)) {
dev_err(dev, "failed to get RESET GPIO\n");
return PTR_ERR(panel->reset_gpio);
@@ -297,6 +301,10 @@ static int r63353_panel_probe(struct mipi_dsi_device *dsi)
return ret;
drm_panel_add(&panel->base);
+ if (initialized) {
+ r63353_panel_power_on(panel);
+ panel->base.prepared = true;
+ }
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
--
2.43.0
