diff options
| -rw-r--r-- | drivers/gpu/drm/panel/panel-himax-hx83102.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-himax-hx83102.c b/drivers/gpu/drm/panel/panel-himax-hx83102.c index 34e0e956db48..8b2a68ee851e 100644 --- a/drivers/gpu/drm/panel/panel-himax-hx83102.c +++ b/drivers/gpu/drm/panel/panel-himax-hx83102.c @@ -7,6 +7,7 @@ * Based on drivers/gpu/drm/panel/panel-himax-hx8394.c */ +#include <linux/backlight.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/module.h> @@ -76,6 +77,8 @@ struct hx83102_panel_desc { unsigned int height_mm; } size; + bool has_backlight; + int (*init)(struct hx83102 *ctx); }; @@ -913,6 +916,7 @@ static const struct hx83102_panel_desc holitech_htf065h045_desc = { .width_mm = 68, .height_mm = 151, }, + .has_backlight = true, .init = holitech_htf065h045_init, }; @@ -1049,6 +1053,59 @@ static const struct drm_panel_funcs hx83102_drm_funcs = { .get_orientation = hx83102_get_orientation, }; +static int hx83102_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 hx83102_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 hx83102_bl_ops = { + .update_status = hx83102_bl_update_status, + .get_brightness = hx83102_bl_get_brightness, +}; + +static struct backlight_device * +hx83102_create_dcs_backlight(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + const struct backlight_properties props = { + .type = BACKLIGHT_RAW, + .brightness = 4095, + .max_brightness = 4095, + }; + + return devm_backlight_device_register(dev, dev_name(dev), dev, dsi, + &hx83102_bl_ops, &props); +} + static int hx83102_panel_add(struct hx83102 *ctx) { struct device *dev = &ctx->dsi->dev; @@ -1080,6 +1137,14 @@ static int hx83102_panel_add(struct hx83102 *ctx) if (err) return err; + /* Use DSI-based backlight as fallback if available */ + if (ctx->desc->has_backlight && !ctx->base.backlight) { + ctx->base.backlight = hx83102_create_dcs_backlight(ctx->dsi); + if (IS_ERR(ctx->base.backlight)) + return dev_err_probe(dev, PTR_ERR(ctx->base.backlight), + "Failed to create backlight\n"); + } + ctx->base.funcs = &hx83102_drm_funcs; ctx->base.dev = &ctx->dsi->dev; |