[v2,09/11] drm/i915/dp: Fix MST disable sequences
diff mbox series

Message ID 20191211020858.423049-9-jose.souza@intel.com
State New
Headers show
Series
  • [v2,01/11] drm: Add __drm_atomic_helper_crtc_state_reset() & co.
Related show

Commit Message

José Roberto de Souza Dec. 11, 2019, 2:08 a.m. UTC
The disable sequence after wait for transcoder off was not correctly
implemented.
The MST disable sequence is basically the same for HSW, SKL, ICL and
TGL, with just minor changes for TGL.

So here calling a new MST function to do the MST sequences, most of
the steps just moved from the post disable hook.

With this last patch we finally fixed the hotplugs triggered by MST
sinks during the disable/enable sequence, those were causing source
to try to do a link training while it was not ready causing CPU pipe
FIFO underrrus on TGL.

v2: Only unsetting TGL_TRANS_DDI_PORT_MASK for TGL on the post
disable sequence

BSpec: 4231
BSpec: 4163
BSpec: 22243
BSpec: 49190
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c     | 33 ++++++---
 drivers/gpu/drm/i915/display/intel_display.c |  2 +
 drivers/gpu/drm/i915/display/intel_dp_mst.c  | 70 ++++++++++++++++----
 drivers/gpu/drm/i915/display/intel_dp_mst.h  |  1 +
 4 files changed, 84 insertions(+), 22 deletions(-)

Patch
diff mbox series

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index e29bde21066e..2fdaae37064b 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -34,6 +34,7 @@ 
 #include "intel_ddi.h"
 #include "intel_display_types.h"
 #include "intel_dp.h"
+#include "intel_dp_mst.h"
 #include "intel_dp_link_training.h"
 #include "intel_dpio_phy.h"
 #include "intel_dsi.h"
@@ -1953,17 +1954,19 @@  void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
-	i915_reg_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
-	u32 val = I915_READ(reg);
+	u32 val;
+
+	val = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
+	val &= ~TRANS_DDI_FUNC_ENABLE;
 
 	if (INTEL_GEN(dev_priv) >= 12) {
-		val &= ~(TRANS_DDI_FUNC_ENABLE | TGL_TRANS_DDI_PORT_MASK |
-			 TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+		if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST) ||
+		    intel_dp_mst_is_slave_trans(crtc_state))
+			val &= ~TGL_TRANS_DDI_PORT_MASK;
 	} else {
-		val &= ~(TRANS_DDI_FUNC_ENABLE | TRANS_DDI_PORT_MASK |
-			 TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+		val &= ~TRANS_DDI_PORT_MASK;
 	}
-	I915_WRITE(reg, val);
+	I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), val);
 
 	if (dev_priv->quirks & QUIRK_INCREASE_DDI_DISABLED_TIME &&
 	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
@@ -3812,8 +3815,20 @@  static void intel_ddi_post_disable_dp(struct intel_encoder *encoder,
 	 */
 	intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
 
-	if (INTEL_GEN(dev_priv) < 12 && !is_mst)
-		intel_ddi_disable_pipe_clock(old_crtc_state);
+	if (INTEL_GEN(dev_priv) >= 12) {
+		if (is_mst) {
+			enum transcoder cpu_transcoder;
+			u32 val;
+
+			cpu_transcoder = old_crtc_state->cpu_transcoder;
+			val = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
+			val &= ~TGL_TRANS_DDI_PORT_MASK;
+			I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), val);
+		}
+	} else {
+		if (!is_mst)
+			intel_ddi_disable_pipe_clock(old_crtc_state);
+	}
 
 	intel_disable_ddi_buf(encoder, old_crtc_state);
 
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 6a815c11c83c..4dc48e79d14b 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -6736,6 +6736,8 @@  static void haswell_crtc_disable(struct intel_atomic_state *state,
 	if (!transcoder_is_dsi(cpu_transcoder))
 		intel_disable_pipe(old_crtc_state);
 
+	intel_dp_mst_post_trans_disabled(old_crtc_state);
+
 	if (INTEL_GEN(dev_priv) >= 11)
 		icl_disable_transcoder_port_sync(old_crtc_state);
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 12f5e799d91f..6d32d4feb351 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -330,6 +330,57 @@  static void intel_mst_disable_dp(struct intel_encoder *encoder,
 					  old_crtc_state, old_conn_state);
 }
 
+static void
+dp_mst_post_trans_disabled(struct intel_encoder *encoder,
+			   const struct intel_crtc_state *old_crtc_state,
+			   const struct drm_connector_state *old_conn_state)
+{
+	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+	struct intel_digital_port *intel_dig_port = intel_mst->primary;
+	struct intel_dp *intel_dp = &intel_dig_port->dp;
+	struct intel_connector *connector =
+		to_intel_connector(old_conn_state->connector);
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	u32 val;
+
+	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
+
+	val = I915_READ(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder));
+	val &= ~TRANS_DDI_DP_VC_PAYLOAD_ALLOC;
+	I915_WRITE(TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder), val);
+
+	if (intel_de_wait_for_set(dev_priv, intel_dp->regs.dp_tp_status,
+				  DP_TP_STATUS_ACT_SENT, 1))
+		DRM_ERROR("Timed out waiting for ACT sent when disabling\n");
+
+	drm_dp_check_act_status(&intel_dp->mst_mgr);
+
+	drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
+}
+
+void
+intel_dp_mst_post_trans_disabled(const struct intel_crtc_state *old_crtc_state)
+{
+	struct drm_atomic_state *state = old_crtc_state->uapi.state;
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector *conn;
+	int i;
+
+	if (!intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DP_MST))
+		return;
+
+	for_each_old_connector_in_state(state, conn, old_conn_state, i) {
+		struct intel_encoder *encoder;
+
+		if (old_conn_state->crtc != old_crtc_state->uapi.crtc)
+			continue;
+
+		encoder = to_intel_encoder(old_conn_state->best_encoder);
+		dp_mst_post_trans_disabled(encoder, old_crtc_state,
+					   old_conn_state);
+	}
+}
+
 static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 				      const struct intel_crtc_state *old_crtc_state,
 				      const struct drm_connector_state *old_conn_state)
@@ -348,6 +399,12 @@  static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 	WARN_ON(INTEL_GEN(dev_priv) >= 12 && last_mst_stream &&
 		!intel_dp_mst_is_master_trans(old_crtc_state));
 
+	/*
+	 * Power down mst path before disabling the port, otherwise we end
+	 * up getting interrupts from the sink upon detecting link loss.
+	 */
+	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
+				     false);
 	/*
 	 * From TGL spec: "If multi-stream slave transcoder: Configure
 	 * Transcoder Clock Select to direct no clock to the transcoder"
@@ -358,19 +415,6 @@  static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
 	if (INTEL_GEN(dev_priv) < 12 || !last_mst_stream)
 		intel_ddi_disable_pipe_clock(old_crtc_state);
 
-	/* this can fail */
-	drm_dp_check_act_status(&intel_dp->mst_mgr);
-	/* and this can also fail */
-	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
-
-	drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
-
-	/*
-	 * Power down mst path before disabling the port, otherwise we end
-	 * up getting interrupts from the sink upon detecting link loss.
-	 */
-	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
-				     false);
 
 	intel_mst->connector = NULL;
 	if (last_mst_stream)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h b/drivers/gpu/drm/i915/display/intel_dp_mst.h
index e40767f78343..87f32fab90fc 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h
@@ -16,5 +16,6 @@  void intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port);
 int intel_dp_mst_encoder_active_links(struct intel_digital_port *intel_dig_port);
 bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state);
 bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state);
+void intel_dp_mst_post_trans_disabled(const struct intel_crtc_state *old_crtc_state);
 
 #endif /* __INTEL_DP_MST_H__ */