In case of Legacy DP connector on TypeC port, the
flex IO DPMLE register is set to number of lanes configured
by the display driver which will be programmed into DDI_BUF_CTL
PORT_WIDTH_SELECTION.
This needs to be programmed before enabling the shared PLLs hence
add a pre_pll_enable hook for ICL and add this programming in that hook.
v2:
* Remove the check for combophy port (Jose)
* Simplify the port reversal check logic (Jose)
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: Jose Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 49 ++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 6b9742baa5f2..246424605768 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3311,6 +3311,53 @@ static void bxt_ddi_pre_pll_enable(struct intel_encoder *encoder,
bxt_ddi_phy_set_lane_optim_mask(encoder, mask);
}
+static void intel_ddi_set_fia_lane_count(struct intel_encoder *encoder,
+ const struct intel_crtc_state *pipe_config,
+ enum port port)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
+ enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
+ u32 val = I915_READ(PORT_TX_DFLEXDPMLE1);
+ bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
+
+ val &= ~DFLEXDPMLE1_DPMLETC_MASK(tc_port);
+ switch (pipe_config->lane_count) {
+ case 1:
+ val |= (lane_reversal) ? DFLEXDPMLE1_DPMLETC_ML3(tc_port) :
+ DFLEXDPMLE1_DPMLETC_ML0(tc_port);
+ break;
+ case 2:
+ val |= (lane_reversal) ? DFLEXDPMLE1_DPMLETC_ML3_2(tc_port) :
+ DFLEXDPMLE1_DPMLETC_ML1_0(tc_port);
+ break;
+ case 4:
+ val |= DFLEXDPMLE1_DPMLETC_ML3_0(tc_port);
+ break;
+ default:
+ MISSING_CASE(pipe_config->lane_count);
+ }
+ I915_WRITE(PORT_TX_DFLEXDPMLE1, val);
+}
+
+static void icl_ddi_pre_pll_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *pipe_config,
+ const struct drm_connector_state *conn_state)
+{
+ enum port port = encoder->port;
+ struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
+
+ /*
+ * Program the lane count for static/dynamic connections on Type-C ports.
+ * Skip this step for TBT.
+ */
+ if (dig_port->tc_type == TC_PORT_UNKNOWN ||
+ dig_port->tc_type == TC_PORT_TBT)
+ return;
+
+ intel_ddi_set_fia_lane_count(encoder, pipe_config, port);
+}
+
void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
@@ -3828,6 +3875,8 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
intel_encoder->enable = intel_enable_ddi;
if (IS_GEN9_LP(dev_priv))
intel_encoder->pre_pll_enable = bxt_ddi_pre_pll_enable;
+ if (IS_ICELAKE(dev_priv))
+ intel_encoder->pre_pll_enable = icl_ddi_pre_pll_enable;
intel_encoder->pre_enable = intel_ddi_pre_enable;
intel_encoder->disable = intel_disable_ddi;
intel_encoder->post_disable = intel_ddi_post_disable;
--
2.18.0
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