On Thu, 2018-12-20 at 17:52 +0200, Imre Deak wrote: > VBT may include incorrect information about the presence of port F. > Work > around this on SKUs where we know the port is not present. If we cannot trust the data in VBT, can we not test for the absence of port-F by enabling the powerwell and checking for a timeout? Or at least mark up a non-existent port after the first timeout so that we don't keep probing it. This patch is an improvement over checking the VBT for all ports, so Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx> > > v2: > - Fix IS_ICL_WITH_PORT_F, so it's useable from any context. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108915 > Cc: Mika Kahola <mika.kahola@xxxxxxxxx> > Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_drv.h | 2 ++ > drivers/gpu/drm/i915/intel_display.c | 4 +++- > 2 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.h > b/drivers/gpu/drm/i915/i915_drv.h > index 815db160b966..e45cda9d9555 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -2317,6 +2317,8 @@ intel_info(const struct drm_i915_private > *dev_priv) > (dev_priv)->info.gt == 3) > #define IS_CNL_WITH_PORT_F(dev_priv) (IS_CANNONLAKE(dev_priv) && \ > (INTEL_DEVID(dev_priv) & > 0x0004) == 0x0004) > +#define IS_ICL_WITH_PORT_F(dev_priv) (IS_ICELAKE(dev_priv) && \ > + INTEL_DEVID(dev_priv) != > 0x8A51) > > #define IS_ALPHA_SUPPORT(intel_info) ((intel_info)- > >is_alpha_support) > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index 2b81da068010..bd7fdaf7e093 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -14276,8 +14276,10 @@ static void intel_setup_outputs(struct > drm_i915_private *dev_priv) > /* > * On some ICL SKUs port F is not present. No strap > bits for > * this, so rely on VBT. > + * Work around broken VBTs on SKUs known to have no > port F. > */ > - if (intel_bios_is_port_present(dev_priv, PORT_F)) > + if (IS_ICL_WITH_PORT_F(dev_priv) && > + intel_bios_is_port_present(dev_priv, PORT_F)) > intel_ddi_init(dev_priv, PORT_F); > > icl_dsi_init(dev_priv); _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
