drm/i915/dsi: Configure DSI after enabling DSI pll

We need to enable DSI PLL before configuring the DSI registers.

This has worked before on BYT/CHV, but BXT is more fussy.
Signed-off-by: NRamalingam C <ramalingam.c@intel.com>
Reviewed-by: NMika Kahola <mika.kahola@intel.com>
Tested-by: Mika Kahola <mika.kahola@intel.com> # BXT
Tested-by: Jani Nikula <jani.nikula@intel.com> # BYT
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1454503846-12103-1-git-send-email-ramalingam.c@intel.com

drivers/gpu/drm/i915/intel_dsi.c

@@ -478,8 +478,8 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder)
 
 	DRM_DEBUG_KMS("\n");
 
-	intel_dsi_prepare(encoder);
 	intel_enable_dsi_pll(encoder);
+	intel_dsi_prepare(encoder);
 
 	/* Panel Enable over CRC PMIC */
 	if (intel_dsi->gpio_panel)