[PATCH 8/8] drm/i915/icl+: Sanitize port to PLL mapping

[Imre Deak <imre.deak@intel.com>]

BIOS can leave the PLL to port mapping enabled, even if the
corresponding encoder is disabled. Disable the port mapping in this
case.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c     | 23 +++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_display.c |  4 ++++
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 3 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index bf58816ed59c..8b7289af7558 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2822,6 +2822,29 @@ void icl_unmap_plls_to_ports(struct drm_crtc *crtc,
 	}
 }
 
+void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	u32 val = I915_READ(DPCLKA_CFGCR0_ICL);
+	enum port port = encoder->port;
+	bool clk_enabled = !(val & icl_dpclka_cfgcr0_clk_off(dev_priv, port));
+
+	if (clk_enabled == !!encoder->base.crtc)
+		return;
+
+	/*
+	 * Punt on the case now where clock is disabled, but the encoder is
+	 * enabled, something else is really broken then.
+	 */
+	if (WARN_ON(!clk_enabled))
+		return;
+
+	DRM_NOTE("Port %c is disabled but it has a mapped PLL, unmap it\n",
+		 port_name(port));
+	val |= icl_dpclka_cfgcr0_clk_off(dev_priv, port);
+	I915_WRITE(DPCLKA_CFGCR0_ICL, val);
+}
+
 static void intel_ddi_clk_select(struct intel_encoder *encoder,
 				 const struct intel_crtc_state *crtc_state)
 {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 12ba2b923e6b..2534263ebb41 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15368,6 +15368,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
 
 static void intel_sanitize_encoder(struct intel_encoder *encoder)
 {
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_connector *connector;
 
 	/* We need to check both for a crtc link (meaning that the
@@ -15409,6 +15410,9 @@ static void intel_sanitize_encoder(struct intel_encoder *encoder)
 
 	/* notify opregion of the sanitized encoder state */
 	intel_opregion_notify_encoder(encoder, connector && has_active_crtc);
+
+	if (INTEL_GEN(dev_priv) >= 11)
+		icl_sanitize_encoder_pll_mapping(encoder);
 }
 
 void i915_redisable_vga_power_on(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a3d7b93ecddd..224edb1a95d5 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1519,6 +1519,7 @@ void icl_map_plls_to_ports(struct drm_crtc *crtc,
 void icl_unmap_plls_to_ports(struct drm_crtc *crtc,
 			     struct intel_crtc_state *crtc_state,
 			     struct drm_atomic_state *old_state);
+void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder);
 
 unsigned int intel_fb_align_height(const struct drm_framebuffer *fb,
 				   int color_plane, unsigned int height);
-- 
2.13.2

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