drm/i915: Do not call hsw_set_frame_start_delay for dsi

This should fix the boot oops for dsi

v2:
* Fix indent (Manasi)
v3:
* Remove redundant condition (Matt Roper)

Fixes: 4e3cdb45 ("drm/i915/dp: Master/Slave enable/disable sequence for bigjoiner")
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201119232615.23231-1-manasi.d.navare@intel.com

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

@@ -7211,12 +7211,10 @@ static void hsw_crtc_enable(struct intel_atomic_state *state,
 	if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
 		bdw_set_pipemisc(new_crtc_state);
 
-	if (!new_crtc_state->bigjoiner_slave || !transcoder_is_dsi(cpu_transcoder)) {
-		if (!transcoder_is_dsi(cpu_transcoder))
+	if (!new_crtc_state->bigjoiner_slave && !transcoder_is_dsi(cpu_transcoder)) {
 		intel_set_transcoder_timings(new_crtc_state);
 
-		if (cpu_transcoder != TRANSCODER_EDP &&
-		    !transcoder_is_dsi(cpu_transcoder))
+		if (cpu_transcoder != TRANSCODER_EDP)
 			intel_de_write(dev_priv, PIPE_MULT(cpu_transcoder),
 				       new_crtc_state->pixel_multiplier - 1);