[Intel-gfx] [PATCH 2/2] drm/i915/icl: Fix PLL mapping sanitization for DP ports

[Imre Deak]

We shouldn't consider an encoder inactive if it doesn't have a CRTC
linked, but has virtual MST encoders with a crtc linked. Fix this.

Also we should not sanitize the mapping for MST encoders, as it's always
their primary encoder (which could be even in SST mode) whose active
state determines if we need the clock being enabled for the
corresponding physical port. Fix this too.

This fixes at least an existing breakage where we incorrectly disabled
the clock for an active DP encoder when sanitizing its MST virtual
encoders. Not sure if there are BIOSes that enable an output in MST
mode, but our HW readout is mostly missing for it anyway, so just warn
for that case.

Fixes: 70332ac539c5 ("drm/i915/icl+: Sanitize port to PLL mapping")
Cc: Antonio Argenziano <antonio.argenziano at intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Reported-by: Antonio Argenziano <antonio.argenziano at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index abc51693eec9..4913bbdac843 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2853,9 +2853,32 @@ 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);
+	u32 val;
 	enum port port = encoder->port;
-	bool clk_enabled = !(val & icl_dpclka_cfgcr0_clk_off(dev_priv, port));
+	bool clk_enabled;
+
+	/*
+	 * In case of DP MST, we sanitize the primary encoder only, not the
+	 * virtual ones.
+	 */
+	if (encoder->type == INTEL_OUTPUT_DP_MST)
+		return;
+
+	val = I915_READ(DPCLKA_CFGCR0_ICL);
+	clk_enabled = !(val & icl_dpclka_cfgcr0_clk_off(dev_priv, port));
+
+	if (!encoder->base.crtc && intel_encoder_is_dp(encoder)) {
+		u8 pipe_mask;
+		bool is_mst;
+
+		intel_ddi_get_encoder_pipes(encoder, &pipe_mask, &is_mst);
+		/*
+		 * In the unlikely case that BIOS enables DP in MST mode, just
+		 * warn since our MST HW readout is incomplete.
+		 */
+		if (WARN_ON(is_mst))
+			return;
+	}
 
 	if (clk_enabled == !!encoder->base.crtc)
 		return;
-- 
2.13.2