From: Anusha Srivatsa <anusha.sriva...@intel.com>
If FEC is supported, the corresponding
DP_TP_CTL register bits have to be configured.
The driver has to program the FEC_ENABLE in DP_TP_CTL[30] register
and wait till FEC_STATUS in DP_TP_CTL[28] is 1.
Also add the warn message to make sure that the control
register is already active while enabling FEC.
v2:
- Change commit message. Configure fec state after
link training (Manasi, Gaurav)
- Remove redundent checks (Manasi)
- Remove the registers that get added automagically (Anusha)
v3: s/intel_dp_set_fec_state()/intel_dp_enable_fec_state() (Gaurav)
v4: rebased.
v5:
- Move the code to the proper spot, according to spec.(Ville)
- Use fec state as a check too.
v6: Pass intel_encoder, instead of intel_dp. (Ville)
v7: Remove unwanted comments (Manasi)
Cc: dri-devel@lists.freedesktop.org
Cc: Gaurav K Singh <gaurav.k.si...@intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Manasi Navare <manasi.d.nav...@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.sriva...@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 2 ++
drivers/gpu/drm/i915/intel_ddi.c | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 21e82c03cf80..5713754ace99 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9198,6 +9198,7 @@ enum skl_power_gate {
#define _DP_TP_CTL_B 0x64140
#define DP_TP_CTL(port) _MMIO_PORT(port, _DP_TP_CTL_A, _DP_TP_CTL_B)
#define DP_TP_CTL_ENABLE (1 << 31)
+#define DP_TP_CTL_FEC_ENABLE (1 << 30)
#define DP_TP_CTL_MODE_SST (0 << 27)
#define DP_TP_CTL_MODE_MST (1 << 27)
#define DP_TP_CTL_FORCE_ACT (1 << 25)
@@ -9216,6 +9217,7 @@ enum skl_power_gate {
#define _DP_TP_STATUS_A 0x64044
#define _DP_TP_STATUS_B 0x64144
#define DP_TP_STATUS(port) _MMIO_PORT(port, _DP_TP_STATUS_A, _DP_TP_STATUS_B)
+#define DP_TP_STATUS_FEC_ENABLE_LIVE (1 << 28)
#define DP_TP_STATUS_IDLE_DONE (1 << 25)
#define DP_TP_STATUS_ACT_SENT (1 << 24)
#define DP_TP_STATUS_MODE_STATUS_MST (1 << 23)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 2d15520f13c5..fb9f8c22cefb 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3112,6 +3112,27 @@ static void intel_dp_sink_set_fec_ready(struct intel_dp
*intel_dp,
DRM_DEBUG_KMS("Failed to get FEC enabled in sink\n");
}
+static void intel_ddi_enable_fec(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ enum port port = encoder->port;
+ u32 val;
+
+ if (!crtc_state->fec_enable)
+ return;
+
+ val = I915_READ(DP_TP_CTL(port));
+ val |= DP_TP_CTL_FEC_ENABLE;
+ I915_WRITE(DP_TP_CTL(port), val);
+
+ if (intel_wait_for_register(dev_priv, DP_TP_STATUS(port),
+ DP_TP_STATUS_FEC_ENABLE_LIVE,
+ DP_TP_STATUS_FEC_ENABLE_LIVE,
+ 1))
+ DRM_ERROR("Timed out waiting for FEC Enable Status\n");
+}
+
static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state
*conn_state)
@@ -3157,6 +3178,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder
*encoder,
if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
intel_dp_stop_link_train(intel_dp);
+ intel_ddi_enable_fec(encoder, crtc_state);
+
icl_enable_phy_clock_gating(dig_port);
if (!is_mst)
--
2.19.1
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