[PATCH 5/8] drm/ofdrm: Store xfrm buffer in device instance

[Thomas Zimmermann]

Store and instance of struct drm_xfrm_buf in struct ofdrm_device and
keep the allocated memory allocated across display updates. Avoid
possibly reallocating temporary memory on each display update. Unloading
the DRM device also releases the xfrm buffer.

Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
 drivers/gpu/drm/tiny/ofdrm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index 1add55c872670..08e4b04e0590e 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -301,6 +301,7 @@ struct ofdrm_device {
        struct drm_display_mode mode;
        const struct drm_format_info *format;
        unsigned int pitch;
+       struct drm_xfrm_buf xfrm;
 
        /* colormap */
        void __iomem *cmap_base;
@@ -796,7 +797,6 @@ static void ofdrm_primary_plane_helper_atomic_update(struct 
drm_plane *plane,
        struct drm_framebuffer *fb = plane_state->fb;
        unsigned int dst_pitch = odev->pitch;
        const struct drm_format_info *dst_format = odev->format;
-       struct drm_xfrm_buf xfrm = DRM_XFRM_BUF_INIT;
        struct drm_atomic_helper_damage_iter iter;
        struct drm_rect damage;
        int ret, idx;
@@ -818,13 +818,12 @@ static void 
ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
 
                iosys_map_incr(&dst, drm_fb_clip_offset(dst_pitch, dst_format, 
&dst_clip));
                drm_fb_blit(&dst, &dst_pitch, dst_format->format, 
shadow_plane_state->data, fb,
-                           &damage, &xfrm);
+                           &damage, &odev->xfrm);
        }
 
        drm_dev_exit(idx);
 out_drm_gem_fb_end_cpu_access:
        drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
-       drm_xfrm_buf_release(&xfrm);
 }
 
 static void ofdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
@@ -1248,6 +1247,10 @@ static struct ofdrm_device *ofdrm_device_create(struct 
drm_driver *drv,
        drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, linebytes=%d 
byte\n",
                &format->format, width, height, linebytes);
 
+       ret = drmm_xfrm_buf_init(dev, &odev->xfrm);
+       if (ret)
+               return ERR_PTR(ret);
+
        /*
         * Mode-setting pipeline
         */
-- 
2.42.0