drm/exynos: fix x, y coordinates for right bottom pixel

The x, y coordinates of right bottom pixel cannot be negative numbers.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 90ca4b2..ae0153b 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -471,6 +471,8 @@ static void fimd_win_commit(struct device *dev, int zpos)
        struct fimd_win_data *win_data;
        int win = zpos;
        unsigned long val, alpha, size;
+       unsigned int last_x;
+       unsigned int last_y;
 
        DRM_DEBUG_KMS("%s\n", __FILE__);
 
@@ -524,16 +526,18 @@ static void fimd_win_commit(struct device *dev, int zpos)
                VIDOSDxA_TOPLEFT_Y(win_data->offset_y);
        writel(val, ctx->regs + VIDOSD_A(win));
 
-       val = VIDOSDxB_BOTRIGHT_X(win_data->offset_x +
-                                       win_data->ovl_width - 1) |
-               VIDOSDxB_BOTRIGHT_Y(win_data->offset_y +
-                                       win_data->ovl_height - 1);
+       last_x = win_data->offset_x + win_data->ovl_width;
+       if (last_x)
+               last_x--;
+       last_y = win_data->offset_y + win_data->ovl_height;
+       if (last_y)
+               last_y--;
+
+       val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y);
        writel(val, ctx->regs + VIDOSD_B(win));
 
        DRM_DEBUG_KMS("osd pos: tx = %d, ty = %d, bx = %d, by = %d\n",
-                       win_data->offset_x, win_data->offset_y,
-                       win_data->offset_x + win_data->ovl_width - 1,
-                       win_data->offset_y + win_data->ovl_height - 1);
+                       win_data->offset_x, win_data->offset_y, last_x, last_y);
 
        /* hardware window 0 doesn't support alpha channel. */
        if (win != 0) {