[PATCH 5/9] drm/msm/dpu: check for the plane pitch overflow

[Dmitry Baryshkov]

Check that the plane pitch doesn't overflow the maximum pitch size
allowed by the hardware.

Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h | 2 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c   | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h
index b7dc52312c39..86b1defa5d21 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h
@@ -12,6 +12,8 @@
 
 struct dpu_hw_sspp;
 
+#define DPU_SSPP_MAX_PITCH_SIZE                0xffff
+
 /**
  * Flags
  */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index a9de1fbd0df3..9e57c51f5343 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -790,7 +790,7 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 {
        struct drm_plane_state *new_plane_state = 
drm_atomic_get_new_plane_state(state,
                                                                                
 plane);
-       int ret = 0, min_scale;
+       int i, ret = 0, min_scale;
        struct dpu_plane *pdpu = to_dpu_plane(plane);
        struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
        u64 max_mdp_clk_rate = kms->perf.max_core_clk_rate;
@@ -864,6 +864,10 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
                return ret;
        }
 
+       for (i = 0; i < pstate->layout.num_planes; i++)
+               if (pstate->layout.plane_pitch[i] > DPU_SSPP_MAX_PITCH_SIZE)
+                       return -E2BIG;
+
        fmt = to_dpu_format(msm_framebuffer_format(new_plane_state->fb));
 
        max_linewidth = pdpu->catalog->caps->max_linewidth;

-- 
2.39.2