From: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
This patch program default values of MBus credit during pipe enable.
Changes Since V1:
- Add WARN_ON (Paulo)
- Remove TODO comment
- Program 0 during pipe disable
- Rebase
Changes since V2:
- We don't need to do anything when disabling the pipe
Changes since V3 (from Paulo):
- Remove WARN() that we'll never be able to trigger (Ville).
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Reviewed-by: James Ausmus <james.ausmus@xxxxxxxxx>
Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ad8d9c6c40e4..5a75bc1eafbc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5418,6 +5418,20 @@ static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
I915_WRITE(CLKGATE_DIS_PSL(pipe), val);
}
+static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
+{
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ enum pipe pipe = crtc->pipe;
+ uint32_t val;
+
+ val = MBUS_DBOX_BW_CREDIT(1) | MBUS_DBOX_A_CREDIT(2);
+
+ /* Program B credit equally to all pipes */
+ val |= MBUS_DBOX_B_CREDIT(24 / INTEL_INFO(dev_priv)->num_pipes);
+
+ I915_WRITE(PIPE_MBUS_DBOX_CTL(pipe), val);
+}
+
static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
struct drm_atomic_state *old_state)
{
@@ -5495,6 +5509,9 @@ static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
if (dev_priv->display.initial_watermarks != NULL)
dev_priv->display.initial_watermarks(old_intel_state, pipe_config);
+ if (INTEL_GEN(dev_priv) >= 11)
+ icl_pipe_mbus_enable(intel_crtc);
+
/* XXX: Do the pipe assertions at the right place for BXT DSI. */
if (!transcoder_is_dsi(cpu_transcoder))
intel_enable_pipe(pipe_config);
--
2.14.3
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