drm/i915: MIPI PPS delays added

Added as generic parameters which will be initialized in the panel
driver and are specific to panels.

Backlight delays have also kept as placeholders and will be used used
once we have MIPI backlight enabling support

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 09b9318..0d4dd54 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -185,6 +185,8 @@
 	/* put device in ready state */
 	intel_dsi_device_ready(encoder);
 
+	msleep(intel_dsi->panel_on_delay);
+
 	if (intel_dsi->dev.dev_ops->panel_reset)
 		intel_dsi->dev.dev_ops->panel_reset(&intel_dsi->dev);
 
@@ -301,6 +303,9 @@
 
 	if (intel_dsi->dev.dev_ops->disable_panel_power)
 		intel_dsi->dev.dev_ops->disable_panel_power(&intel_dsi->dev);
+
+	msleep(intel_dsi->panel_off_delay);
+	msleep(intel_dsi->panel_pwr_cycle_delay);
 }
 
 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,