On Thu, May 16, 2019 at 03:55:25PM +0300, Jani Nikula wrote: > On Thu, 16 May 2019, Maarten Lankhorst <maarten.lankho...@linux.intel.com> > wrote: > > Op 16-05-2019 om 07:58 schreef Harish Chegondi: > >> display_pipe_crc_irq_handler() skips the first CRC for all GPUs and the > >> second CRC for GEN8+ GPUs. The second CRC is invalid even for BYT which > >> is a GEN7 GPU. So, skip the second CRC even for GEN7 GPUs. > >> > >> Cc: Jani Nikula <jani.nik...@intel.com> > >> Cc: Tomi Sarvela <tomi.p.sarv...@intel.com> > >> Cc: Petri Latvala <petri.latv...@intel.com> > >> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> > >> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com> > >> Signed-off-by: Harish Chegondi <harish.chego...@intel.com> > >> References: https://bugs.freedesktop.org/show_bug.cgi?id=103191 > >> --- > >> drivers/gpu/drm/i915/i915_irq.c | 4 ++-- > >> 1 file changed, 2 insertions(+), 2 deletions(-) > >> > >> diff --git a/drivers/gpu/drm/i915/i915_irq.c > >> b/drivers/gpu/drm/i915/i915_irq.c > >> index 233211fde0ea..3809e9f7fae2 100644 > >> --- a/drivers/gpu/drm/i915/i915_irq.c > >> +++ b/drivers/gpu/drm/i915/i915_irq.c > >> @@ -1775,11 +1775,11 @@ static void display_pipe_crc_irq_handler(struct > >> drm_i915_private *dev_priv, > >> * bonkers. So let's just wait for the next vblank and read > >> * out the buggy result. > >> * > >> - * On GEN8+ sometimes the second CRC is bonkers as well, so > >> + * On GEN7+ sometimes the second CRC is bonkers as well, so > >> * don't trust that one either. > >> */ > >> if (pipe_crc->skipped <= 0 || > >> - (INTEL_GEN(dev_priv) >= 8 && pipe_crc->skipped == 1)) { > >> + (INTEL_GEN(dev_priv) >= 7 && pipe_crc->skipped == 1)) { > >> pipe_crc->skipped++; > >> spin_unlock(&pipe_crc->lock); > >> return; > > > > I would be interested in the results, haswell is different from > > VLV. Has it ever been observed on that platform? > > Good point. I looked at [1] which I presumed was on VLV, but it says > nothing about HSW.
This whole thing is just a pile of duct tape anyway. The reason(s) for these funky crcs has never been properly analysed. -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
