@@ -4366,6 +4366,47 @@ static void icl_set_pipe_chicken(struct intel_crtc *crtc)
I915_WRITE(PIPE_CHICKEN(pipe), tmp);
}
+static void icl_enable_trans_port_sync(struct intel_atomic_state *old_intel_state,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ u32 trans_ddi_func_ctl2_val;
+ u8 master_select;
+
+ /*
+ * Configure the master select and enable Transcoder Port Sync for
+ * Slave CRTCs transcoder.
+ */
+ if (crtc_state->master_transcoder == INVALID_TRANSCODER)
+ return;
+
+ switch (crtc_state->master_transcoder) {
+ case TRANSCODER_A:
+ master_select = 1;
+ break;
+ case TRANSCODER_B:
+ master_select = 2;
+ break;
+ case TRANSCODER_C:
+ master_select = 3;
+ break;
+ case TRANSCODER_EDP:
+ default:
+ master_select = 0;
+ break;
+ }
+ /* Set the master select bits for Tranascoder Port Sync */
+ trans_ddi_func_ctl2_val = (PORT_SYNC_MODE_MASTER_SELECT(master_select) &
+ PORT_SYNC_MODE_MASTER_SELECT_MASK) <<
+ PORT_SYNC_MODE_MASTER_SELECT_SHIFT;
+ /* Enable Transcoder Port Sync */
+ trans_ddi_func_ctl2_val |= PORT_SYNC_MODE_ENABLE;
+
+ I915_WRITE(TRANS_DDI_FUNC_CTL2(crtc_state->cpu_transcoder),
+ trans_ddi_func_ctl2_val);
+}
+
static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_state,
const struct intel_crtc_state *new_crtc_state)
{
@@ -6344,6 +6385,9 @@ static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
if (!transcoder_is_dsi(cpu_transcoder))
intel_set_pipe_timings(pipe_config);
+ if (INTEL_GEN(dev_priv) >= 11)
+ icl_enable_trans_port_sync(old_intel_state, pipe_config);
+
intel_set_pipe_src_size(pipe_config);
if (cpu_transcoder != TRANSCODER_EDP &&
In case of tiled displays where different tiles are displayed across different ports, we need to synchronize the transcoders involved. This patch implements the transcoder port sync feature for synchronizing one master transcoder with one or more slave transcoders. This is only enbaled in slave transcoder and the master transcoder is unaware that it is operating in this mode. This has been tested with tiled display connected to ICL. v3: * Check of DP_MST moved to atomic_check (Maarten) v2: * Do not use RMW, just write to the register in commit (Jani N) Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> --- drivers/gpu/drm/i915/display/intel_display.c | 44 ++++++++++++++++++++ 1 file changed, 44 insertions(+)