drm/i915/bios: Fix the timing parameters

Fix htotal and vtotal parameters derived from DTD block of VBT. The
values miss the back porch.

Fixes: 33ef6d4f ("drm/i915/vbt: Handle generic DTD block")
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200124125829.16973-1-vandita.kulkarni@intel.com
(cherry picked from commit ad278f35)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -357,14 +357,16 @@ parse_generic_dtd(struct drm_i915_private *dev_priv,
 		panel_fixed_mode->hdisplay + dtd->hfront_porch;
 	panel_fixed_mode->hsync_end =
 		panel_fixed_mode->hsync_start + dtd->hsync;
-	panel_fixed_mode->htotal = panel_fixed_mode->hsync_end;
+	panel_fixed_mode->htotal =
+		panel_fixed_mode->hdisplay + dtd->hblank;
 
 	panel_fixed_mode->vdisplay = dtd->vactive;
 	panel_fixed_mode->vsync_start =
 		panel_fixed_mode->vdisplay + dtd->vfront_porch;
 	panel_fixed_mode->vsync_end =
 		panel_fixed_mode->vsync_start + dtd->vsync;
-	panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end;
+	panel_fixed_mode->vtotal =
+		panel_fixed_mode->vdisplay + dtd->vblank;
 
 	panel_fixed_mode->clock = dtd->pixel_clock;
 	panel_fixed_mode->width_mm = dtd->width_mm;