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drm/panel: nt36523: Add DCS backlight support

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This chip supports controlling the backlight via DCS commands, on at
least some panels. Add support for doing so.

Note this may only concern the NT36523*W* variant. Nobody knows, really,
there's no docs.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Jianhua Lu <lujianhua000@gmail.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230412-topic-lenovopanel-v3-2-bcf9ba4de46f@linaro.org
This commit is contained in:
Konrad Dybcio
2023-04-17 16:39:04 +02:00
committed by Neil Armstrong
parent b4b26ab24f
commit aecb583cb9
1 changed files with 65 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/gpu/drm/panel/panel-novatek-nt36523.c
View File

@@ -5,6 +5,7 @@
* Copyright (c) 2022, 2023 Jianhua Lu <lujianhua000@gmail.com>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
@@ -53,6 +54,7 @@ struct panel_desc {
int (*init_sequence)(struct panel_info *pinfo);
bool is_dual_dsi;
bool has_dcs_backlight;
};
static inline struct panel_info *to_panel_info(struct drm_panel *panel)
@@ -679,6 +681,59 @@ static const struct drm_panel_funcs nt36523_panel_funcs = {
.get_modes = nt36523_get_modes,
};
static int nt36523_bl_update_status(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness = backlight_get_brightness(bl);
int ret;
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
if (ret < 0)
return ret;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return 0;
}
static int nt36523_bl_get_brightness(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness;
int ret;
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
if (ret < 0)
return ret;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return brightness;
}
static const struct backlight_ops nt36523_bl_ops = {
.update_status = nt36523_bl_update_status,
.get_brightness = nt36523_bl_get_brightness,
};
static struct backlight_device *nt36523_create_backlight(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
const struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = 512,
.max_brightness = 4095,
.scale = BACKLIGHT_SCALE_NON_LINEAR,
};
return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
&nt36523_bl_ops, &props);
}
static int nt36523_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
@@ -730,9 +785,16 @@ static int nt36523_probe(struct mipi_dsi_device *dsi)
mipi_dsi_set_drvdata(dsi, pinfo);
drm_panel_init(&pinfo->panel, dev, &nt36523_panel_funcs, DRM_MODE_CONNECTOR_DSI);
ret = drm_panel_of_backlight(&pinfo->panel);
if (ret)
return dev_err_probe(dev, ret, "failed to get backlight\n");
if (pinfo->desc->has_dcs_backlight) {
pinfo->panel.backlight = nt36523_create_backlight(dsi);
if (IS_ERR(pinfo->panel.backlight))
return dev_err_probe(dev, PTR_ERR(pinfo->panel.backlight),
"Failed to create backlight\n");
} else {
ret = drm_panel_of_backlight(&pinfo->panel);
if (ret)
return dev_err_probe(dev, ret, "Failed to get backlight\n");
}
drm_panel_add(&pinfo->panel);