[Bug 101517] [BAT][BYT,BSW] WARN_ON(dev_priv->uncore.funcs.mmio_readl(dev_priv, (((const i915_reg_t){ .reg = (0x180000 + 0x650C) })), true) & (1 << 27))

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101517

--- Comment #3 from krisman at collabora.co.uk ---
(In reply to Martin Peres from comment #0)
> Starting from CI_DRM_2743, executing the tests
> igt at kms_pipe_crc_basic@suspend-read-crc-pipe-[ac] on our baytrails and
> braswells may lead to the following WARNING:
> 
> [  579.071526] [drm:chv_set_cdclk [i915]] *ERROR* timed out waiting for
> CDclk change
> [  579.071942] WARN_ON(dev_priv->uncore.funcs.mmio_readl(dev_priv, (((const

In the code, this WARN_ON carries the following comment:

  /*
   * FIXME is this guaranteed to clear
   * immediately or should we poll for it?
  */
  WARN_ON(I915_READ(GCI_CONTROL) & PFI_CREDIT_RESEND);

Maybe we should consider polling? :-)

Anyway, that WARN_ON can be a side effect of the *ERROR* right before it.  I'm
Looking into that.  Also, I don't see much change in the commit log between
CI_DRM_2742 and CI_DRM_2743 that would explain it, but I will take a deeper
look.

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