drm/gma500: Read EDID from the correct i2c adapter

Someone made the mistake to try reading EDID from the backlight i2c
adapter. This has been wrong for a very long time but since we read out
the modes correctly on init and don't hotplug lvds it has been working
anyway. Correct this by using connector->ddc instead of
encoder->i2c_bus. Both PSB and CDV are affected but this bug.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220601092311.22648-9-patrik.r.jakobsson@gmail.com

drivers/gpu/drm/gma500/cdv_intel_lvds.c

@@ -298,11 +298,10 @@ static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
-	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 	int ret;
 
-	ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->base);
+	ret = psb_intel_ddc_get_modes(connector, connector->ddc);
 
 	if (ret)
 		return ret;

drivers/gpu/drm/gma500/psb_intel_lvds.c

@@ -491,12 +491,10 @@ static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 	struct drm_device *dev = connector->dev;
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
-	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
-	struct psb_intel_lvds_priv *lvds_priv = gma_encoder->dev_priv;
 	int ret = 0;
 
 	if (!IS_MRST(dev))
-		ret = psb_intel_ddc_get_modes(connector, &lvds_priv->i2c_bus->base);
+		ret = psb_intel_ddc_get_modes(connector, connector->ddc);
 
 	if (ret)
 		return ret;