On Wed, Jul 21, 2021 at 09:40:03PM +0100, Christoph Hellwig wrote:
> On Wed, Jul 21, 2021 at 04:43:44PM +0100, Christoph Hellwig wrote:
> > > > I'm trying to test some changes for the gvt code, but even with a baseline
> > > > 5.14-rc2 host and guest the 915 driver does not seem overly happy:
> > >
> > > Is this a regression over -rc1 or over 5.13?
> > > Bisect possible?
> >
> > This was introduced somewhere between 5.12 and 5.13, still bisecting.
> > Note that it only happens for "headless" setups. Once a display is
> > added on the qemu command line it goes away.
>
> The culprit is:
>
> commit f4eb6d4906669b4285c4f49c87814d4ce63c35bb
> Author: Jani Nikula <jani.nikula@xxxxxxxxx>
> Date: Wed Mar 17 18:36:45 2021 +0200
>
> drm/i915/bios: limit default outputs to ports A through F
>
could you please try this small patch?
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 5b6922e28ef2..8bbeb5978bf7 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2166,7 +2166,8 @@ static void
init_vbt_missing_defaults(struct drm_i915_private *i915)
{
enum port port;
- int ports = PORT_A | PORT_B | PORT_C | PORT_D | PORT_E | PORT_F;
+ int ports = BIT(PORT_A) | BIT(PORT_B) | BIT(PORT_C) | \
+ BIT(PORT_D) | BIT(PORT_E) | BIT(PORT_F);
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