Re: [igt-dev] [PATCH i-g-t] tests/kms_fbcon_fbt: Do a full connector probe.

[Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>]

On Tue, 2019-02-05 at 10:45 -0800, Souza, Jose wrote:
> On Mon, 2019-02-04 at 12:55 -0800, Dhinakaran Pandiyan wrote:
> > kms_fbtcon_fbt appears to fail when it is the first test that is
> > executed
> > after module load.
> > 'Test requirement not met in function set_mode_for_one_screen, file
> > ../tests/kms_fbcon_fbt.c:153:
> > Test requirement: i < drm->res->count_connectors'
> > The problem seems to be that the 1920x1080 bios fb is re-used and
> > that
> > prunes the 4k mode before test execution. Later, when the test does
> > not
> > do a full-probe, the eDP connector does not have any valid modes.
> 
> drmModeGetConnectorCurrent() will get only one mode, the active one.
I don't see any reference to an active mode in getconnector ioctl
implementation.

> 
> > 
> > <7>[   12.444411] [drm:drm_mode_debug_printmodeline] Modeline
> > 191:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222
> > 0x48
> > 0xa
> > <7>[   12.444418] [drm:drm_mode_prune_invalid] Not using 3840x2160
> > mode:
> > 
> > 
> > Fix this by calling drmModeGetConnector() instead
> > drmModeGetConnectorCurrent()
> > 
> > Note that that test is still expected to fail as PSR status checks
> > are
> > broken.
> 
> Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Thanks for the review.

> 
> > 
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109518

Daniel,

We are seeing a rare failure, which I think is because .count_modes ==
0 when this test is run as the first test after module loading. Here's
what I think is happening- 
drm_fb_helper.c: drm_setup_crtcs(fb_helper, fb_helper->fb->width,
fb_helper->fb->height) results in pruning the only eDP mode(3840x2160)
because the fb limits are lower. Further, when the test calls
drmModeGetConnectorCurrent(), there is no call to ->fill_modes() to
update available modes. 

git blame shows that you switched the libdrm call from
drmModeGetConnector() to drmModeGetConnectorCurrent() in kms_fbcon_fbt.
Can you confirm if the below fix is right? I just want to be sure I am
not overlooking a kernel bug.


-DK


> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > ---
> >  tests/kms_fbcon_fbt.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tests/kms_fbcon_fbt.c b/tests/kms_fbcon_fbt.c
> > index 9d0d5a36..40465a1c 100644
> > --- a/tests/kms_fbcon_fbt.c
> > +++ b/tests/kms_fbcon_fbt.c
> > @@ -67,7 +67,7 @@ static void setup_drm(struct drm_info *drm)
> >  	igt_assert(drm->res->count_connectors <= MAX_CONNECTORS);
> >  
> >  	for (i = 0; i < drm->res->count_connectors; i++)
> > -		drm->connectors[i] = drmModeGetConnectorCurrent(drm-
> > > fd,
> > 
> > +		drm->connectors[i] = drmModeGetConnector(drm->fd,
> >  						drm->res-
> > > connectors[i]);
> > 
> >  
> >  	kmstest_set_vt_graphics_mode();

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