drm/i915/dsi: Use devm_gpiod_get() for all GPIOs

soc_gpio_set_value() already uses devm_gpiod_get(), lets be consistent
and use devm_gpiod_get() for all GPIOs.

This allows removing the intel_dsi_vbt_gpio_cleanup() function,
which only function was to put the GPIO-descriptors.

Signed-off-by: Hans de Goede <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Acked-by: Jani Nikula <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/display/intel_dsi_vbt.c

···
 		gpiod_add_lookup_table(gpiod_lookup_table);
 
 	if (want_panel_gpio) {
-		intel_dsi->gpio_panel = gpiod_get(dev->dev, "panel", flags);
+		intel_dsi->gpio_panel = devm_gpiod_get(dev->dev, "panel", flags);
 		if (IS_ERR(intel_dsi->gpio_panel)) {
 			drm_err(&dev_priv->drm,
 				"Failed to own gpio for panel control\n");
···
 
 	if (want_backlight_gpio) {
 		intel_dsi->gpio_backlight =
-			gpiod_get(dev->dev, "backlight", flags);
+			devm_gpiod_get(dev->dev, "backlight", flags);
 		if (IS_ERR(intel_dsi->gpio_backlight)) {
 			drm_err(&dev_priv->drm,
 				"Failed to own gpio for backlight control\n");
···
 
 	if (gpiod_lookup_table)
 		gpiod_remove_lookup_table(gpiod_lookup_table);
-}
-
-void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi)
-{
-	if (intel_dsi->gpio_panel) {
-		gpiod_put(intel_dsi->gpio_panel);
-		intel_dsi->gpio_panel = NULL;
-	}
-
-	if (intel_dsi->gpio_backlight) {
-		gpiod_put(intel_dsi->gpio_backlight);
-		intel_dsi->gpio_backlight = NULL;
-	}
 }

drivers/gpu/drm/i915/display/intel_dsi_vbt.h

···
 
 bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id);
 void intel_dsi_vbt_gpio_init(struct intel_dsi *intel_dsi, bool panel_is_on);
-void intel_dsi_vbt_gpio_cleanup(struct intel_dsi *intel_dsi);
 void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi,
 				 enum mipi_seq seq_id);
 void intel_dsi_log_params(struct intel_dsi *intel_dsi);

drivers/gpu/drm/i915/display/vlv_dsi.c

···
 	}
 }
 
-static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
-{
-	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
-
-	intel_dsi_vbt_gpio_cleanup(intel_dsi);
-	intel_encoder_destroy(encoder);
-}
-
 static const struct drm_encoder_funcs intel_dsi_funcs = {
-	.destroy = intel_dsi_encoder_destroy,
+	.destroy = intel_encoder_destroy,
 };
 
 static enum drm_mode_status vlv_dsi_mode_valid(struct drm_connector *connector,