[PATCH v8 17/19] drm/i915/dp: Disable DSC in source by disabling DSS CTL bits

[Manasi Navare <manasi.d.navare@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:
* Remove encoder, make crtc_state const (Ville)
v3 (From Manasi):
* Add Disable PG2 for VDSC on eDP
v2 (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

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>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  1 +
 drivers/gpu/drm/i915/intel_display.c |  2 ++
 drivers/gpu/drm/i915/intel_vdsc.c    | 32 ++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f347d0d7b9eb..c80c9a1af3d1 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3487,6 +3487,7 @@ extern bool intel_set_memory_cxsr(struct drm_i915_private *dev_priv,
 				  bool enable);
 extern void intel_dsc_enable(struct intel_encoder *encoder,
 			     const struct intel_crtc_state *crtc_state);
+extern void intel_dsc_disable(const struct intel_crtc_state *crtc_state);
 
 int i915_reg_read_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d3aa77f4d606..cbeea906c531 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5848,6 +5848,8 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
 	if (!transcoder_is_dsi(cpu_transcoder))
 		intel_ddi_disable_transcoder_func(old_crtc_state);
 
+	intel_dsc_disable(old_crtc_state);
+
 	if (INTEL_GEN(dev_priv) >= 9)
 		skylake_scaler_disable(intel_crtc);
 	else
diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index fae5193551d8..02102cd275fd 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -1041,3 +1041,35 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	return;
 }
+
+void intel_dsc_disable(const 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(crtc->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 (old_crtc_state->cpu_transcoder == TRANSCODER_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);
+
+}
-- 
2.18.0

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