On Tue, Jan 16, 2018 at 01:24:14PM +0200, Imre Deak wrote:
> 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.
>
> v2:
> - Use -ERANGE instead of -EINVAL. (Chris)
>
> Signed-off-by: Imre Deak <imre.d...@intel.com>
For both patches
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> 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..7fe1592bf0df 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);
> + return -ERANGE;
> + }
> +
> intel_add_fb_offsets(&x, &y, plane_state, 0);
> offset = intel_compute_tile_offset(&x, &y, plane_state, 0);
> alignment = intel_surf_alignment(fb, 0);
> @@ -3067,7 +3086,8 @@ static int skl_check_ccs_aux_surface(struct
> intel_plane_state *plane_state)
> return 0;
> }
>
> -int skl_check_plane_surface(struct intel_plane_state *plane_state)
> +int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
> + struct intel_plane_state *plane_state)
> {
> const struct drm_framebuffer *fb = plane_state->base.fb;
> unsigned int rotation = plane_state->base.rotation;
> @@ -3107,7 +3127,7 @@ int skl_check_plane_surface(struct intel_plane_state
> *plane_state)
> plane_state->aux.y = 0;
> }
>
> - ret = skl_check_main_surface(plane_state);
> + ret = skl_check_main_surface(crtc_state, plane_state);
> if (ret)
> return ret;
>
> @@ -12766,7 +12786,7 @@ intel_check_primary_plane(struct intel_plane *plane,
> return 0;
>
> if (INTEL_GEN(dev_priv) >= 9) {
> - ret = skl_check_plane_surface(state);
> + ret = skl_check_plane_surface(crtc_state, state);
> if (ret)
> return ret;
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 5c8e260ca2bc..0f2356d84d0d 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1588,7 +1588,8 @@ u32 skl_plane_ctl(const struct intel_crtc_state
> *crtc_state,
> const struct intel_plane_state *plane_state);
> u32 skl_plane_stride(const struct drm_framebuffer *fb, int plane,
> unsigned int rotation);
> -int skl_check_plane_surface(struct intel_plane_state *plane_state);
> +int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
> + struct intel_plane_state *plane_state);
> int i9xx_check_plane_surface(struct intel_plane_state *plane_state);
>
> /* intel_csr.c */
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index dd485f59eb1d..b8b617ba0c0c 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -1027,7 +1027,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
> dst->y2 = crtc_y + crtc_h;
>
> if (INTEL_GEN(dev_priv) >= 9) {
> - ret = skl_check_plane_surface(state);
> + ret = skl_check_plane_surface(crtc_state, state);
> if (ret)
> return ret;
>
> --
> 2.13.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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