When LSPCON is used, DIPs(Data Island Packets of DP or HDMI) will not be
used. Therefore it explicitly disables DIPs on encoder->pre_enable
callback.
It resolves below issue
- reproduce step of issue
1) Boot or Pause & Resume system
2) Do not enable SPD (Source Product Description) DIP
3) When driver tries to read a DIP Ctl register,
it is written that SDP DIP is enabled.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 7f29b08ea202..195e66744c1e 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3627,6 +3627,22 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
crtc_state, conn_state);
}
+static void intel_ddi_disable_dips(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ i915_reg_t reg = HSW_TVIDEO_DIP_CTL(crtc_state->cpu_transcoder);
+ u32 dip_enable = VIDEO_DIP_ENABLE_VSC_HSW | VIDEO_DIP_ENABLE_AVI_HSW |
+ VIDEO_DIP_ENABLE_GCP_HSW | VIDEO_DIP_ENABLE_VS_HSW |
+ VIDEO_DIP_ENABLE_GMP_HSW | VIDEO_DIP_ENABLE_SPD_HSW |
+ VIDEO_DIP_ENABLE_DRM_GLK;
+ u32 val = intel_de_read(dev_priv, reg);
+
+ val &= ~dip_enable;
+ intel_de_write(dev_priv, reg, val);
+ intel_de_posting_read(dev_priv, reg);
+}
+
static void intel_ddi_pre_enable(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
@@ -3666,6 +3682,13 @@ static void intel_ddi_pre_enable(struct intel_encoder *encoder,
struct intel_digital_port *dig_port =
enc_to_dig_port(encoder);
+ /*
+ * When LSPCON is used, DIPs (Data Island Packets of DP
+ * or HDMI) will not be used.
+ * Therefore we explicitly disable DIPs here.
+ */
+ intel_ddi_disable_dips(encoder, crtc_state);
+
dig_port->set_infoframes(encoder,
crtc_state->has_infoframe,
crtc_state, conn_state);
--
2.24.1
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