[Intel-gfx] [PATCH v3 3/3] drm/i915/dp: Disable Port sync mode correctly on teardown

[Manasi Navare]

While clearing the Ports ync mode enable and master select bits
we need to clear the register completely instead of using disable masks

v2:
* Just write 0 to the reg (Ville)
* Rebase

Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Fixes: 51528afe7c5e ("drm/i915/display/icl: Disable transcoder port sync as part of crtc_disable() sequence")
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c9ba7d7f3787..c484f6df5d87 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3861,7 +3861,6 @@ static void icl_disable_transcoder_port_sync(const struct intel_crtc_state *old_
 	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	i915_reg_t reg;
-	u32 trans_ddi_func_ctl2_val;
 
 	if (old_crtc_state->master_transcoder == INVALID_TRANSCODER)
 		return;
@@ -3870,9 +3869,7 @@ static void icl_disable_transcoder_port_sync(const struct intel_crtc_state *old_
 		      transcoder_name(old_crtc_state->cpu_transcoder));
 
 	reg = TRANS_DDI_FUNC_CTL2(old_crtc_state->cpu_transcoder);
-	trans_ddi_func_ctl2_val = ~(PORT_SYNC_MODE_ENABLE |
-				    PORT_SYNC_MODE_MASTER_SELECT_MASK);
-	I915_WRITE(reg, trans_ddi_func_ctl2_val);
+	I915_WRITE(reg, 0);
 }
 
 static void intel_ddi_post_disable(struct intel_encoder *encoder,
-- 
2.19.1