Quoting Maarten Lankhorst (2019-02-15 16:02:40)
> Op 15-02-2019 om 13:30 schreef Chris Wilson:
> > If we skipped all the connectors that were not part of a tile, we would
> > leave conn_seq=0 and conn_configured=0, convincing ourselves that we
> > had stagnated in our configuration attempts. Avoid this situation by
> > starting conn_seq=ALL_CONNECTORS, and repeating until we find no more
> > connectors to configure.
> >
> > Fixes: 754a76591b12 ("drm/i915/fbdev: Stop repeating tile configuration on stagnation")
> > Reported-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_fbdev.c | 12 +++++++-----
> > 1 file changed, 7 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
> > index 376ffe842e26..e8f694b57b8a 100644
> > --- a/drivers/gpu/drm/i915/intel_fbdev.c
> > +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> > @@ -338,8 +338,8 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> > bool *enabled, int width, int height)
> > {
> > struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
> > - unsigned long conn_configured, conn_seq, mask;
> > unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
> > + unsigned long conn_configured, conn_seq;
> > int i, j;
> > bool *save_enabled;
> > bool fallback = true, ret = true;
> > @@ -357,10 +357,9 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> > drm_modeset_backoff(&ctx);
> >
> > memcpy(save_enabled, enabled, count);
> > - mask = GENMASK(count - 1, 0);
> > + conn_seq = GENMASK(count - 1, 0);
> > conn_configured = 0;
> > retry:
> > - conn_seq = conn_configured;
> > for (i = 0; i < count; i++) {
> > struct drm_fb_helper_connector *fb_conn;
> > struct drm_connector *connector;
> > @@ -373,7 +372,8 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> > if (conn_configured & BIT(i))
> > continue;
> >
> > - if (conn_seq == 0 && !connector->has_tile)
> > + /* First pass, only consider tiled connectors */
> > + if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
> > continue;
> >
> > if (connector->status == connector_status_connected)
> > @@ -477,8 +477,10 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> > conn_configured |= BIT(i);
> > }
> >
> > - if ((conn_configured & mask) != mask && conn_configured != conn_seq)
> > + if (conn_configured != conn_seq) { /* repeat until no more are found */
> > + conn_seq = conn_configured;
> > goto retry;
> > + }
> >
> > /*
> > * If the BIOS didn't enable everything it could, fall back to have the
>
> Also Cc: <stable@xxxxxxxxxxxxxxx> # v3.19+ , because it fixes a previous stable fix?
I put the fixes there, the rest I leave to maintainers and AUTOSEL :-p
-Chris
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