drm/i915: Changes related to the sequence port no for

From now on for both DSI Ports A & C, the seq_port value has been
set to 0. seq_port value is parsed from Sequence block#53 of VBT.
So, for packets that needs to be read/write for DSI single link on
Port A and Port C will now be based on the DVO port from VBT block 2,
instead of seq_port.
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dsi_panel_vbt.c

@@ -110,7 +110,15 @@ static u8 *mipi_exec_send_packet(struct intel_dsi *intel_dsi, u8 *data)
 	vc = (byte >> MIPI_VIRTUAL_CHANNEL_SHIFT) & 0x3;
 	seq_port = (byte >> MIPI_PORT_SHIFT) & 0x3;
 
-	port = intel_dsi_seq_port_to_port(seq_port);
+	/* For DSI single link on Port A & C, the seq_port value which is
+	 * parsed from Sequence Block#53 of VBT has been set to 0
+	 * Now, read/write of packets for the DSI single link on Port A and
+	 * Port C will based on the DVO port from VBT block 2.
+	 */
+	if (intel_dsi->ports == (1 << PORT_C))
+		port = PORT_C;
+	else
+		port = intel_dsi_seq_port_to_port(seq_port);
 	/* LP or HS mode */
 	intel_dsi->hs = mode;