[igt-dev] [PATCH i-g-t] tests/kms_panel_fitting: Fix plane scaling avoidance on gen7/gen8

[Ville Syrjälä]

On Fri, Aug 30, 2019 at 03:30:23PM -0700, Matt Roper wrote:
> Most gen7 and gen8 platforms can't do plane scaling, so we need to
> ensure the test doesn't try to do plane scaling on those platforms.  The
> legacy non-atomic subtest bakes these platform characteristics into the
> test itself since legacy modesetting interfaces don't provide a way to
> probe platform capabilities like atomic does.
> 
> Maarten previously tried to address this with commit 24c5e0778
> ("tests/kms_panel_fitting: Do not use scaling on gen7 and gen8, v2."),
> but he augmented an existing test for gen9+pipeC which comes too late
> since we've already turned on the plane at that point.  We can fix this
> by moving the test up higher; not only before we enable panel fitting,
> but also before we turn on the sprite.
> 
> Note that this still isn't a great subtest since it's very
> Intel-specific, despite being part of a generic KMS test that's intended
> for all vendors.  A future enhancement might be to try to probe the
> platform capabilities with a TEST_ONLY atomic operation before using the
> legacy interfaces to actually program them.
> 
> While touching the code, I also added some slight restructuring, added
> additional comments, and broke up >80 char lines to add clarity to
> what's going on.
> 
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  tests/kms_panel_fitting.c | 24 +++++++++++++++++++-----
>  1 file changed, 19 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/kms_panel_fitting.c b/tests/kms_panel_fitting.c
> index 491e429f..a942294b 100644
> --- a/tests/kms_panel_fitting.c
> +++ b/tests/kms_panel_fitting.c
> @@ -131,11 +131,10 @@ static void test_panel_fitting(data_t *d)
>  		igt_fb_set_position(&d->fb2, d->plane2, 100, 100);
>  		igt_fb_set_size(&d->fb2, d->plane2, d->fb2.width-200, d->fb2.height-200);
>  		igt_plane_set_position(d->plane2, 100, 100);
> -		igt_plane_set_size(d->plane2, mode->hdisplay-200, mode->vdisplay-200);
> -		igt_display_commit2(display, COMMIT_UNIVERSAL);
>  
>  		/*
> -		 * most of gen7 and all of gen8 doesn't support scaling at all.
> +		 * Most of gen7 and all of gen8 doesn't support plane scaling
> +		 * at all.
>  		 *
>  		 * gen9 pipe C has only 1 scaler shared with the crtc, which
>  		 * means pipe scaling can't work simultaneously with panel
> @@ -144,9 +143,24 @@ static void test_panel_fitting(data_t *d)
>  		 * Since this is the legacy path, userspace has to know about
>  		 * the HW limitations, whereas atomic can ask.
>  		 */
> -		if (IS_GEN8(devid) || (IS_GEN7(devid) && !IS_IVYBRIDGE(devid)) ||
> +		if (IS_GEN8(devid) ||
> +		    (IS_GEN7(devid) && !IS_IVYBRIDGE(devid)) ||
>  		    (IS_GEN9(devid) && pipe == PIPE_C))
> -			igt_plane_set_size(d->plane2, d->fb2.width-200, d->fb2.height-200);
> +			/* same as visible area of fb => no scaling */
> +			igt_plane_set_size(d->plane2,
> +					   d->fb2.width-200,
> +					   d->fb2.height-200);
> +		else
> +			/*
> +			 * different than visible area of fb => plane scaling
> +			 * active
> +			 */
> +			igt_plane_set_size(d->plane2,
> +					   mode->hdisplay-200,
> +					   mode->vdisplay-200);
> +
> +		/* Plane scaling active (if possible), pfit off */
> +		igt_display_commit2(display, COMMIT_UNIVERSAL);
>  
>  		/* enable panel fitting along with sprite scaling */
>  		mode->hdisplay = 1024;
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel