On Wed, Sep 26, 2018 at 03:56:39PM +0300, Mika Kuoppala wrote:
Ville Syrjälä ville.syrjala@linux.intel.com writes:
On Tue, Sep 25, 2018 at 04:38:03PM +0300, Mika Kuoppala wrote:
Using fbc with VT-d flickers also on kbl and cfl.
Cc: Paulo Zanoni paulo.r.zanoni@intel.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: stable@vger.kernel.org # v4.9+ Signed-off-by: Mika Kuoppala mika.kuoppala@linux.intel.com
drivers/gpu/drm/i915/intel_fbc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c index 74d425c700ef..a149f08c1b79 100644 --- a/drivers/gpu/drm/i915/intel_fbc.c +++ b/drivers/gpu/drm/i915/intel_fbc.c @@ -1275,9 +1275,10 @@ static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv) static bool need_fbc_vtd_wa(struct drm_i915_private *dev_priv) {
- /* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
- /* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt,kbl,cfl */
The hsds seem to be saying that this was fixed in kbl/cnl. I guess the flicker could be due to a different vt-d vs. fbc issue.
I was trusting the wa database on this one.
I believe it would be worth to trust the wa_database, but this database can be tricky too...
Like on this case it is listed for KBL, but A0 only and not listed for CFL.
Is the chicken bit in CHICKEN_PIPESL in the correct position?
Yes it is zero.
Hmm. Bspec doesn't list chicken bit for glk. That would seem to suggest that we need this w/a for glk as well.
Agreed. The questio is that should we follow bspec and logic or leave it until we get a report if it is a problem?
cfl is close enough|similar in this respect that we mimic kbl with it?
yes, we can safely consider it is similar to latest steppings of KBL.
Thanks, -Mika
if (intel_vtd_active() &&
(IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))) {
(IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv) ||IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))) {-- 2.17.1
-- Ville Syrjälä Intel