Quoting Imre Deak (2018-01-12 14:54:36)
> As described in the WA on GLK and CNL planes on the right edge of the
> screen that have less than 4 pixels visible from the beginning of the
> plane to the edge of the screen can cause FIFO underflow and display
> corruption.
>
> On GLK/CNL I could trigger the problem only if the plane was at the same
> time also aligned to the top edge of the screen (after clipping) and
> there were exactly 2 pixels visible from the start of the plane to the
> right edge of the screen (so couldn't trigger it with 1 or 3 pixels
> visible). Nevertheless, to be sure, I also applied the WA for these cases.
>
> I also couldn't see any problem with the cursor plane and later Art
> confirmed that it's not affected, so the WA is applied only for the
> other plane types.
>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 28 ++++++++++++++++++++++++----
> drivers/gpu/drm/i915/intel_drv.h | 3 ++-
> drivers/gpu/drm/i915/intel_sprite.c | 2 +-
> 3 files changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 221e3a183d36..3d931b652795 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2917,14 +2917,19 @@ static bool skl_check_main_ccs_coordinates(struct intel_plane_state *plane_state
> return true;
> }
>
> -static int skl_check_main_surface(struct intel_plane_state *plane_state)
> +static int skl_check_main_surface(const struct intel_crtc_state *crtc_state,
> + struct intel_plane_state *plane_state)
> {
> + struct drm_i915_private *dev_priv =
> + to_i915(plane_state->base.plane->dev);
> const struct drm_framebuffer *fb = plane_state->base.fb;
> unsigned int rotation = plane_state->base.rotation;
> int x = plane_state->base.src.x1 >> 16;
> int y = plane_state->base.src.y1 >> 16;
> int w = drm_rect_width(&plane_state->base.src) >> 16;
> int h = drm_rect_height(&plane_state->base.src) >> 16;
> + int dst_x = plane_state->base.dst.x1;
> + int pipe_src_w = crtc_state->pipe_src_w;
> int max_width = skl_max_plane_width(fb, 0, rotation);
> int max_height = 4096;
> u32 alignment, offset, aux_offset = plane_state->aux.offset;
> @@ -2935,6 +2940,20 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
> return -EINVAL;
> }
>
> + /*
> + * Display WA #1175: cnl,glk
> + * Planes other than the cursor may cause FIFO underflow and display
> + * corruption if starting less than 4 pixels from the right edge of
> + * the screen.
> + */
> + if ((IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
> + dst_x > pipe_src_w - 4) {
> + DRM_DEBUG_KMS("requested plane X start position %d invalid (valid range %d-%d)\n",
> + dst_x,
> + 0, pipe_src_w - 4);
You are rejecting user input, so this should be DRM_DEBUG() (or whatever
the future user channel will be).
-Chris
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
