[PATCH 23/23] drm/i915/dp: Disable DSC in source by disabling DSS CTL bits

[Manasi Navare <manasi.d.navare@intel.com>]

From: Gaurav K Singh <gaurav.k.singh@intel.com>

1. Disable Left/right VDSC branch in DSS Ctrl reg
    depending on the number of VDSC engines being used
2. Disable joiner in DSS Ctrl reg

v4: (From  Manasi)
* Rebase on top of revised patches
v3 (From Manasi):
* Use old_crtc_state to find dsc params
* Add a condition to disable only if
dsc state compression is enabled
* Use correct DSS CTL regs
v2 (From Manasi):
* Fix tons of compilation errors like undefined
variables, incorrect use of macros and all dirty laundry

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 6d5d410..c13f32b 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -1046,3 +1046,35 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	return;
 }
+
+void intel_dsc_disable(struct intel_encoder *encoder,
+		       struct intel_crtc_state *old_crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	enum pipe pipe = crtc->pipe;
+	i915_reg_t dss_ctl1_reg, dss_ctl2_reg;
+	u32 dss_ctl1_val = 0, dss_ctl2_val = 0;
+
+	if (!old_crtc_state->dsc_params.compression_enable)
+		return;
+
+	if (encoder->type == INTEL_OUTPUT_EDP) {
+		dss_ctl1_reg = DSS_CTL1;
+		dss_ctl2_reg = DSS_CTL2;
+	} else {
+		dss_ctl1_reg = ICL_PIPE_DSS_CTL1(pipe);
+		dss_ctl2_reg = ICL_PIPE_DSS_CTL2(pipe);
+	}
+	dss_ctl1_val = I915_READ(dss_ctl1_reg);
+	if (dss_ctl1_val & JOINER_ENABLE)
+		dss_ctl1_val &= ~JOINER_ENABLE;
+	I915_WRITE(dss_ctl1_reg, dss_ctl1_val);
+
+	dss_ctl2_val = I915_READ(dss_ctl2_reg);
+	if (dss_ctl2_val & LEFT_BRANCH_VDSC_ENABLE ||
+	    dss_ctl2_val & RIGHT_BRANCH_VDSC_ENABLE)
+		dss_ctl2_val &= ~(LEFT_BRANCH_VDSC_ENABLE |
+				  RIGHT_BRANCH_VDSC_ENABLE);
+	I915_WRITE(dss_ctl2_reg, dss_ctl2_val);
+}
-- 
2.7.4

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