Add support for panels that use the DPI interface.
ILI9341 has onboard RAM so the assumption made here is that all such
panels support pixel upload over DBI.
The presence/absense of the Device Tree 'port' node decides which
interface is used for pixel transfer.
Signed-off-by: Noralf Trønnes <nor...@tronnes.org>
---
drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 56 ++++++++++++++++----
1 file changed, 45 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
index f6082fa2a389..7cbfd739c7fd 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -11,6 +11,7 @@
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/of_graph.h>
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
@@ -53,11 +54,13 @@
struct ili9341_config {
const struct drm_panel_funcs *funcs;
const struct drm_display_mode *mode;
+ bool no_dpi;
};
struct ili9341 {
struct mipi_dbi_dev dbidev; /* This must be the first entry */
struct drm_panel panel;
+ bool use_dpi;
struct regulator *regulator;
struct backlight_device *backlight;
const struct ili9341_config *conf;
@@ -174,6 +177,7 @@ static const struct drm_display_mode yx240qv29_mode = {
static const struct ili9341_config yx240qv29_data = {
.funcs = &yx240qv29_funcs,
.mode = &yx240qv29_mode,
+ .no_dpi = true,
};
static int mi0283qt_prepare(struct drm_panel *panel)
@@ -291,6 +295,7 @@ static const struct drm_display_mode mi0283qt_mode = {
static const struct ili9341_config mi0283qt_data = {
.funcs = &mi0283qt_drm_funcs,
.mode = &mi0283qt_mode,
+ .no_dpi = true,
};
/* Legacy, DRM driver name is ABI */
@@ -303,6 +308,7 @@ static int ili9341_probe(struct spi_device *spi)
const struct spi_device_id *spi_id;
struct device *dev = &spi->dev;
struct drm_driver *driver;
+ struct device_node *port;
struct mipi_dbi *dbi;
struct gpio_desc *dc;
struct ili9341 *ili;
@@ -357,21 +363,44 @@ static int ili9341_probe(struct spi_device *spi)
ili->panel.dev = dev;
ili->panel.funcs = ili->conf->funcs;
- if (ili->conf == &mi0283qt_data)
- driver = &mi0283qt_drm_driver;
- else
- driver = &ili9341_drm_driver;
- return drm_mipi_dbi_panel_register(&ili->panel, &ili->dbidev, driver,
- ili->conf->mode, rotation);
+ port = of_get_child_by_name(dev->of_node, "port");
+ if (port) {
+ of_node_put(port);
+ ili->use_dpi = true;
+ }
+
+ if (ili->conf->no_dpi)
+ ili->use_dpi = false;
+
+ if (ili->use_dpi) {
+ ret = drm_panel_add(&ili->panel);
+ } else {
+ if (ili->conf == &mi0283qt_data)
+ driver = &mi0283qt_drm_driver;
+ else
+ driver = &ili9341_drm_driver;
+
+ ret = drm_mipi_dbi_panel_register(&ili->panel, &ili->dbidev,
driver,
+ ili->conf->mode, rotation);
+ }
+
+ return ret;
}
static int ili9341_remove(struct spi_device *spi)
{
struct ili9341 *ili = spi_get_drvdata(spi);
- drm_dev_unplug(&ili->dbidev.drm);
- drm_atomic_helper_shutdown(&ili->dbidev.drm);
+ if (ili->use_dpi) {
+ drm_panel_remove(&ili->panel);
+ drm_panel_disable(&ili->panel);
+ drm_panel_unprepare(&ili->panel);
+ kfree(ili);
+ } else {
+ drm_dev_unplug(&ili->dbidev.drm);
+ drm_atomic_helper_shutdown(&ili->dbidev.drm);
+ }
return 0;
}
@@ -380,21 +409,26 @@ static void ili9341_shutdown(struct spi_device *spi)
{
struct ili9341 *ili = spi_get_drvdata(spi);
- drm_atomic_helper_shutdown(&ili->dbidev.drm);
+ if (!ili->use_dpi)
+ drm_atomic_helper_shutdown(&ili->dbidev.drm);
}
static int __maybe_unused ili9341_pm_suspend(struct device *dev)
{
struct ili9341 *ili = dev_get_drvdata(dev);
- return drm_mode_config_helper_suspend(&ili->dbidev.drm);
+ if (!ili->use_dpi)
+ return drm_mode_config_helper_suspend(&ili->dbidev.drm);
+
+ return 0;
}
static int __maybe_unused ili9341_pm_resume(struct device *dev)
{
struct ili9341 *ili = dev_get_drvdata(dev);
- drm_mode_config_helper_resume(&ili->dbidev.drm);
+ if (!ili->use_dpi)
+ drm_mode_config_helper_resume(&ili->dbidev.drm);
return 0;
}
--
2.20.1
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