drm/panel: innolux-p079zca: 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.

Cc: Chris Zhong <[e-mail]>
Cc: Lin Huang <[e-mail]>
Cc: Brian Norris <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Acked-by: Maxime Ripard <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Douglas Anderson <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503143327.RFT.v2.8.I99c73621fe3fba067a5e7ee6a1f6293c23371e1e@changeid

drivers/gpu/drm/panel/panel-innolux-p079zca.c

···
 
 	struct regulator_bulk_data *supplies;
 	struct gpio_desc *enable_gpio;
-
-	bool prepared;
-	bool enabled;
 };
 
 static inline struct innolux_panel *to_innolux_panel(struct drm_panel *panel)
···
 	return container_of(panel, struct innolux_panel, base);
 }
 
-static int innolux_panel_disable(struct drm_panel *panel)
-{
-	struct innolux_panel *innolux = to_innolux_panel(panel);
-
-	if (!innolux->enabled)
-		return 0;
-
-	innolux->enabled = false;
-
-	return 0;
-}
-
 static int innolux_panel_unprepare(struct drm_panel *panel)
 {
 	struct innolux_panel *innolux = to_innolux_panel(panel);
 	int err;
-
-	if (!innolux->prepared)
-		return 0;
 
 	err = mipi_dsi_dcs_set_display_off(innolux->link);
 	if (err < 0)
···
 	if (err < 0)
 		return err;
 
-	innolux->prepared = false;
-
 	return 0;
 }
 
···
 {
 	struct innolux_panel *innolux = to_innolux_panel(panel);
 	int err;
-
-	if (innolux->prepared)
-		return 0;
 
 	gpiod_set_value_cansleep(innolux->enable_gpio, 0);
 
···
 	/* T7: 5ms */
 	usleep_range(5000, 6000);
 
-	innolux->prepared = true;
-
 	return 0;
 
 poweroff:
···
 	regulator_bulk_disable(innolux->desc->num_supplies, innolux->supplies);
 
 	return err;
-}
-
-static int innolux_panel_enable(struct drm_panel *panel)
-{
-	struct innolux_panel *innolux = to_innolux_panel(panel);
-
-	if (innolux->enabled)
-		return 0;
-
-	innolux->enabled = true;
-
-	return 0;
 }
 
 static const char * const innolux_p079zca_supply_names[] = {
···
 }
 
 static const struct drm_panel_funcs innolux_panel_funcs = {
-	.disable = innolux_panel_disable,
 	.unprepare = innolux_panel_unprepare,
 	.prepare = innolux_panel_prepare,
-	.enable = innolux_panel_enable,
 	.get_modes = innolux_panel_get_modes,
 };