drm/panel: khadas-ts050: Stop tracking prepared/enabled

As talked about in commit d2aacaf0 ("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: Jacobe Zang <jacobe.zang@wesion.com>
Cc: Nicolas Belin <nbelin@baylibre.com>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240604172305.v3.3.Ibed1026f20cab08c90fa376e68c2f23a343e826b@changeidSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240604172305.v3.3.Ibed1026f20cab08c90fa376e68c2f23a343e826b@changeid

drivers/gpu/drm/panel/panel-khadas-ts050.c

@@ -26,9 +26,6 @@ struct khadas_ts050_panel {
 	struct gpio_desc *reset_gpio;
 	struct gpio_desc *enable_gpio;
 	struct khadas_ts050_panel_data *panel_data;
-
-	bool prepared;
-	bool enabled;
 };
 
 struct khadas_ts050_panel_cmd {
@@ -642,9 +639,6 @@ static int khadas_ts050_panel_prepare(struct drm_panel *panel)
 	unsigned int i;
 	int err;
 
-	if (khadas_ts050->prepared)
-		return 0;
-
 	gpiod_set_value_cansleep(khadas_ts050->enable_gpio, 0);
 
 	err = regulator_enable(khadas_ts050->supply);
@@ -708,8 +702,6 @@ static int khadas_ts050_panel_prepare(struct drm_panel *panel)
 
 	usleep_range(10000, 11000);
 
-	khadas_ts050->prepared = true;
-
 	return 0;
 
 poweroff:
@@ -726,11 +718,6 @@ static int khadas_ts050_panel_unprepare(struct drm_panel *panel)
 	struct khadas_ts050_panel *khadas_ts050 = to_khadas_ts050_panel(panel);
 	int err;
 
-	if (!khadas_ts050->prepared)
-		return 0;
-
-	khadas_ts050->prepared = false;
-
 	err = mipi_dsi_dcs_enter_sleep_mode(khadas_ts050->link);
 	if (err < 0)
 		dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);
@@ -747,31 +734,17 @@ static int khadas_ts050_panel_unprepare(struct drm_panel *panel)
 	return 0;
 }
 
-static int khadas_ts050_panel_enable(struct drm_panel *panel)
-{
-	struct khadas_ts050_panel *khadas_ts050 = to_khadas_ts050_panel(panel);
-
-	khadas_ts050->enabled = true;
-
-	return 0;
-}
-
 static int khadas_ts050_panel_disable(struct drm_panel *panel)
 {
 	struct khadas_ts050_panel *khadas_ts050 = to_khadas_ts050_panel(panel);
 	int err;
 
-	if (!khadas_ts050->enabled)
-		return 0;
-
 	err = mipi_dsi_dcs_set_display_off(khadas_ts050->link);
 	if (err < 0)
 		dev_err(panel->dev, "failed to set display off: %d\n", err);
 
 	usleep_range(10000, 11000);
 
-	khadas_ts050->enabled = false;
-
 	return 0;
 }
 
@@ -815,7 +788,6 @@ static int khadas_ts050_panel_get_modes(struct drm_panel *panel,
 static const struct drm_panel_funcs khadas_ts050_panel_funcs = {
 	.prepare = khadas_ts050_panel_prepare,
 	.unprepare = khadas_ts050_panel_unprepare,
-	.enable = khadas_ts050_panel_enable,
 	.disable = khadas_ts050_panel_disable,
 	.get_modes = khadas_ts050_panel_get_modes,
 };