[igt-dev] [PATCH i-g-t] tests/kms_plane_alpha_blend: Skip crc assertion in coverage-vs-premult-vs-none for 6bpc panels

[Shankar, Uma]

> -----Original Message-----
> From: Modem, Bhanuprakash <bhanuprakash.modem at intel.com>
> Sent: Thursday, July 8, 2021 5:51 PM
> To: Srinivas, Vidya <vidya.srinivas at intel.com>; igt-dev at lists.freedesktop.org;
> Shankar, Uma <uma.shankar at intel.com>
> Subject: RE: [igt-dev] [PATCH i-g-t] tests/kms_plane_alpha_blend: Skip crc assertion
> in coverage-vs-premult-vs-none for 6bpc panels
> 
> > From: Srinivas, Vidya <vidya.srinivas at intel.com>
> > Sent: Thursday, July 8, 2021 5:03 PM
> > To: Modem, Bhanuprakash <bhanuprakash.modem at intel.com>; igt-
> > dev at lists.freedesktop.org
> > Subject: RE: [igt-dev] [PATCH i-g-t] tests/kms_plane_alpha_blend: Skip
> > crc assertion in coverage-vs-premult-vs-none for 6bpc panels
> >
> > Hello Bhanu,
> >
> > No we skip it for all 6bpc. We can skip the test, but as discussed
> > with Uma, I just skip crc check, not the test.
> > Kindly suggest further.
> 
> If we remove/skip the crc check, I think there is no point in doing further commits
> unless we have kernel checkers.
> 
> Uma?

I think it's a compromise here,  skip on 6bpc would be ideal here or we need to have some
passing criterion in order to declare this as pass.

We can do the bpc check after the first commit and skip there itself if we detect 6bpc.This should
be better given the constraints. Also Vidya its good to add MIPI_DSI along with eDP as well since
we have some 6bpc MIPI DSI panels as well. 

> >
> > Regards
> > Vidya
> >
> > -----Original Message-----
> > From: Modem, Bhanuprakash <bhanuprakash.modem at intel.com>
> > Sent: Thursday, July 8, 2021 4:15 PM
> > To: Srinivas, Vidya <vidya.srinivas at intel.com>;
> > igt-dev at lists.freedesktop.org
> > Subject: RE: [igt-dev] [PATCH i-g-t] tests/kms_plane_alpha_blend: Skip
> > crc assertion in coverage-vs-premult-vs-none for 6bpc panels
> >
> > > From: igt-dev <igt-dev-bounces at lists.freedesktop.org> On Behalf Of
> > > Vidya Srinivas
> > > Sent: Thursday, July 8, 2021 3:01 PM
> > > To: igt-dev at lists.freedesktop.org
> > > Subject: [igt-dev] [PATCH i-g-t] tests/kms_plane_alpha_blend: Skip
> > > crc assertion in coverage-vs-premult-vs-none for 6bpc panels
> > >
> > > Intel Gen11 platforms using 6bpc panels have dithering ON and show
> > > CRC mismatch in coverage-vs-premult-vs-none Doing a crc based test
> > > with dithering is not a great idea as pixels will change due to the
> > > 8bit to 6bits truncation with dithering.
> > >
> > > This patch skips the CRC assertion for 6bpc panels. Currently, there
> > > is no better way of fetching the bpc info other than EDID or
> > > display_info. Currently using i915_display_info for the same. Hence
> > > restricting the check to i915 devices only.
> > >
> > > Credits-to: Uma Shankar <uma.shankar at intel.com>
> > > Credits-to: Juha-pekka Heikkila <juha-pekka.heikkila at intel.com>
> > > Credits-to: Modem Bhanuprakash <Bhanuprakash.Modem at intel.com>
> > > Reviewed-by: Uma Shankar <uma.shankar at intel.com>
> > > Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>
> > > ---
> > >  tests/kms_plane_alpha_blend.c | 43
> > > +++++++++++++++++++++++++++++++++--
> > >  1 file changed, 41 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/tests/kms_plane_alpha_blend.c
> > > b/tests/kms_plane_alpha_blend.c index a37cb27c7d62..e450e64cb105
> > > 100644
> > > --- a/tests/kms_plane_alpha_blend.c
> > > +++ b/tests/kms_plane_alpha_blend.c
> > > @@ -442,10 +442,42 @@ static void coverage_7efc(data_t *data, enum
> > > pipe pipe, igt_plane_t *plane)
> > >  	igt_pipe_crc_stop(data->pipe_crc);
> > >  }
> > >
> > > +static bool is_6bpc(igt_display_t *display, enum pipe pipe) {
> > > +	char buf[4096];
> > > +	char *str;
> > > +	bool ret;
> > > +	int debugfs_fd;
> > > +	drmModeConnector *c;
> > > +	igt_output_t *output = igt_get_single_output_for_pipe(display,
> > > +pipe);
> > > +
> > > +	if (!is_i915_device(display->drm_fd))
> > > +		return false;
> > > +
> > > +	c = output->config.connector;
> > > +	if (c->connector_type != DRM_MODE_CONNECTOR_eDP)
> > > +		return false;
> > > +
> > > +	debugfs_fd = igt_debugfs_dir(display->drm_fd);
> > > +	if (debugfs_fd < 0)
> > > +		return false;
> > > +
> > > +	igt_debugfs_simple_read(debugfs_fd, "i915_display_info", buf,
> > > sizeof(buf));
> > > +
> > > +	str = strstr(buf, "bpp=");
> > > +	if (str && (strncmp(str, "bpp=18", 6) == 0))
> > > +		ret = true;
> > > +	else
> > > +		ret = false;
> > > +
> > > +	close(debugfs_fd);
> > > +	return ret;
> > > +}
> > > +
> > >  static void coverage_premult_constant(data_t *data, enum pipe pipe,
> > > igt_plane_t *plane)  {
> > >  	igt_display_t *display = &data->display;
> > >  	igt_crc_t ref_crc = {}, crc = {};
> > > +	bool is6bpc = false;
> > >
> > >  	/* Set a background color on the primary fb for testing */
> > >  	if (plane->type != DRM_PLANE_TYPE_PRIMARY) @@ -461,14 +493,21 @@
> > > static void coverage_premult_constant(data_t *data, enum pipe pipe,
> > > igt_plane_t
> > >  	igt_plane_set_fb(plane, &data->argb_fb_7e);
> > >  	igt_display_commit2(display, COMMIT_ATOMIC);
> > >  	igt_pipe_crc_get_current(display->drm_fd, data->pipe_crc, &crc);
> > > -	igt_assert_crc_equal(&ref_crc, &crc);
> > > +
> > > +	/* 6bpc panels have dithering ON and CRC might fail, hence skip
> > > +crc
> > > check */
> > > +	is6bpc = is_6bpc(display, pipe);
> > > +	if (is6bpc == false)
> > > +		igt_assert_crc_equal(&ref_crc, &crc);
> >
> > We can SKIP here, right? Also no need to run on remaining planes.
> > Otherwise IGT will report this test result as PASS instead of reporting as SKIP.
> >
> > igt_require_f(!is_6bpc(display, pipe), "Skip test on 6 bpc panels\n");
> >
> >
> > Also, are we going to skip this test on only gen 11? Then we need a
> > check to perform such.
> >
> > if (is_i915_device(fd) && intel_gen(intel_get_drm_devid(fd)) == 11)
> > 	igt_require_f(!is_6bpc(display, pipe), "Skip test on 6 bpc
> > panels\n");
> >
> > >
> > >  	igt_plane_set_prop_enum(plane, IGT_PLANE_PIXEL_BLEND_MODE,
> "None");
> > >  	igt_plane_set_prop_value(plane, IGT_PLANE_ALPHA, 0x7e7e);
> > >  	igt_plane_set_fb(plane, &data->argb_fb_cov_7e);
> > >  	igt_display_commit2(display, COMMIT_ATOMIC);
> > >  	igt_pipe_crc_get_current(display->drm_fd, data->pipe_crc, &crc);
> > > -	igt_assert_crc_equal(&ref_crc, &crc);
> > > +
> > > +	/* 6bpc panels have dithering ON and CRC might fail, hence skip
> > > +crc
> > > check */
> > > +	if (is6bpc == false)
> > > +		igt_assert_crc_equal(&ref_crc, &crc);
> > >
> > >  	igt_pipe_crc_stop(data->pipe_crc);
> > >  }
> > > --
> > > 2.32.0
> > >
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