drm/panel: jdi-lt070me05000: Stop tracking prepared/enabled

As talked about in commit d2aacaf07395 ("drm/panel: Check for already
prepared/enabled in drm_panel"), we want to remove needless code from
panel drivers that was storing and double-checking the
prepared/enabled state. Even if someone was relying on the
double-check before, that double-check is now in the core and not
needed in individual drivers.

NOTE: as part of this, transition the panel's direct calls to its
disable function in shutdown/remove to call through DRM panel.

Cc: Vinay Simha BN <[e-mail]>
Cc: Sumit Semwal <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Acked-by: Maxime Ripard <[e-mail]>
Signed-off-by: Douglas Anderson <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/20240604172305.v3.11.I2e991044def6644c18ad8d7d686f4f3006f278de@changeid
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/20240604172305.v3.11.I2e991044def6644c18ad8d7d686f4f3006f278de@changeid

drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

···
 	struct gpio_desc *dcdc_en_gpio;
 	struct backlight_device *backlight;
 
-	bool prepared;
-	bool enabled;
-
 	const struct drm_display_mode *mode;
 };
 
···
 {
 	struct jdi_panel *jdi = to_jdi_panel(panel);
 
-	if (!jdi->enabled)
-		return 0;
-
 	backlight_disable(jdi->backlight);
-
-	jdi->enabled = false;
 
 	return 0;
 }
···
 	struct jdi_panel *jdi = to_jdi_panel(panel);
 	struct device *dev = &jdi->dsi->dev;
 	int ret;
-
-	if (!jdi->prepared)
-		return 0;
 
 	jdi_panel_off(jdi);
 
···
 
 	gpiod_set_value(jdi->dcdc_en_gpio, 0);
 
-	jdi->prepared = false;
-
 	return 0;
 }
 
···
 	struct jdi_panel *jdi = to_jdi_panel(panel);
 	struct device *dev = &jdi->dsi->dev;
 	int ret;
-
-	if (jdi->prepared)
-		return 0;
 
 	ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
 	if (ret < 0) {
···
 		goto poweroff;
 	}
 
-	jdi->prepared = true;
-
 	return 0;
 
 poweroff:
···
 {
 	struct jdi_panel *jdi = to_jdi_panel(panel);
 
-	if (jdi->enabled)
-		return 0;
-
 	backlight_enable(jdi->backlight);
-
-	jdi->enabled = true;
 
 	return 0;
 }
···
 	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
 	int ret;
 
-	ret = jdi_panel_disable(&jdi->base);
+	ret = drm_panel_disable(&jdi->base);
 	if (ret < 0)
 		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
 
···
 {
 	struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
 
-	jdi_panel_disable(&jdi->base);
+	drm_panel_disable(&jdi->base);
 }
 
 static struct mipi_dsi_driver jdi_panel_driver = {