Specification states that DDI_CLK_SEL needs to be mapped to MG clock
even if MG do not exist on EHL, this will ungate those DDIs.
BSpec: 20845
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c6f38c7b397d..fb58845020dc 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2921,6 +2921,12 @@ static void intel_ddi_clk_select(struct intel_encoder *encoder,
if (!intel_phy_is_combo(dev_priv, phy))
I915_WRITE(DDI_CLK_SEL(port),
icl_pll_to_ddi_clk_sel(encoder, crtc_state));
+ else if (IS_ELKHARTLAKE(dev_priv) && port >= PORT_C)
+ /*
+ * MG does not exist but the programming is required
+ * to ungate DDIC and DDID
+ */
+ I915_WRITE(DDI_CLK_SEL(port), DDI_CLK_SEL_MG);
} else if (IS_CANNONLAKE(dev_priv)) {
/* Configure DPCLKA_CFGCR0 to map the DPLL to the DDI. */
val = I915_READ(DPCLKA_CFGCR0);
@@ -2961,7 +2967,8 @@ static void intel_ddi_clk_disable(struct intel_encoder *encoder)
enum phy phy = intel_port_to_phy(dev_priv, port);
if (INTEL_GEN(dev_priv) >= 11) {
- if (!intel_phy_is_combo(dev_priv, phy))
+ if (!intel_phy_is_combo(dev_priv, phy) ||
+ (IS_ELKHARTLAKE(dev_priv) && port >= PORT_C))
I915_WRITE(DDI_CLK_SEL(port), DDI_CLK_SEL_NONE);
} else if (IS_CANNONLAKE(dev_priv)) {
I915_WRITE(DPCLKA_CFGCR0, I915_READ(DPCLKA_CFGCR0) |
--
2.22.0
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