From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Dump the full DSB command buffers and head/tail pointers if the
the DSB hasn't completed its job in time.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dsb.c | 33 +++++++++++++++++++++---
1 file changed, 30 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 9e25b1345927..f454329b6901 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -92,6 +92,22 @@ static bool assert_dsb_has_room(struct intel_dsb *dsb)
crtc->base.base.id, crtc->base.name, dsb->id);
}
+static void intel_dsb_dump(struct intel_dsb *dsb)
+{
+ struct intel_crtc *crtc = dsb->crtc;
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ const u32 *buf = dsb->cmd_buf;
+ int i;
+
+ drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] DSB %d commands {\n",
+ crtc->base.base.id, crtc->base.name, dsb->id);
+ for (i = 0; i < ALIGN(dsb->free_pos, 64 / 4); i += 4)
+ drm_dbg_kms(&i915->drm,
+ " 0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x\n",
+ i * 4, buf[i], buf[i+1], buf[i+2], buf[i+3]);
+ drm_dbg_kms(&i915->drm, "}\n");
+}
+
static bool is_dsb_busy(struct drm_i915_private *i915, enum pipe pipe,
enum dsb_id id)
{
@@ -260,10 +276,21 @@ void intel_dsb_wait(struct intel_dsb *dsb)
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
enum pipe pipe = crtc->pipe;
- if (wait_for(!is_dsb_busy(dev_priv, pipe, dsb->id), 1))
+ if (wait_for(!is_dsb_busy(dev_priv, pipe, dsb->id), 1)) {
+ u32 offset = i915_ggtt_offset(dsb->vma);
+
+ intel_de_write(dev_priv, DSB_CTRL(pipe, dsb->id),
+ DSB_ENABLE | DSB_HALT);
+
drm_err(&dev_priv->drm,
- "[CRTC:%d:%s] DSB %d timed out waiting for idle\n",
- crtc->base.base.id, crtc->base.name, dsb->id);
+ "[CRTC:%d:%s] DSB %d timed out waiting for idle (current head=0x%x, head=0x%x, tail=0x%x)\n",
+ crtc->base.base.id, crtc->base.name, dsb->id,
+ intel_de_read(dev_priv, DSB_CURRENT_HEAD(pipe, dsb->id)) - offset,
+ intel_de_read(dev_priv, DSB_HEAD(pipe, dsb->id)) - offset,
+ intel_de_read(dev_priv, DSB_TAIL(pipe, dsb->id)) - offset);
+
+ intel_dsb_dump(dsb);
+ }
/* Attempt to reset it */
dsb->free_pos = 0;
--
2.38.2
