drm/i915/dsi: Do panel power on + reset deassert earlier on icl+

Looks like we're trying to talk to the DSI panel even before turning
it on, on icl+. Bspec doesn't actually specify when these should be
done, but certainly we need to turn the panel on at least before
talking to it. So let's move the power on + reset deassert steps to
be the first thing we do. This is also what Windows does.

v2: s/intel_dsi_msleep/msleep/

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230608203057.23759-2-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -1138,10 +1138,6 @@ static void gen11_dsi_powerup_panel(struct intel_encoder *encoder)
 				"error setting max return pkt size%d\n", tmp);
 	}
 
-	/* panel power on related mipi dsi vbt sequences */
-	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
-	msleep(intel_dsi->panel_on_delay);
-	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
 	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
 	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 
@@ -1154,6 +1150,12 @@ static void gen11_dsi_pre_pll_enable(struct intel_atomic_state *state,
 				     const struct intel_crtc_state *crtc_state,
 				     const struct drm_connector_state *conn_state)
 {
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+
+	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
+	msleep(intel_dsi->panel_on_delay);
+	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
+
 	/* step2: enable IO power */
 	gen11_dsi_enable_io_power(encoder);