The hardware needs a FB which is packed. Add checks to make sure
this is the case.

While at it, add debug logs for the existing checks. This allows
user-space to more easily figure out why a configuration is
rejected.

v2:
- Use drm_format_info instead of hardcoding bytes-per-pixel (Ilia)
- Remove unnecessary size check (Ilia)

Signed-off-by: Simon Ser <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Ilia Mirkin <[email protected]>
---
 drivers/gpu/drm/nouveau/dispnv50/curs507a.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/curs507a.c 
b/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
index 54fbd6fe751d..00f09c9a8d15 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/curs507a.c
@@ -30,6 +30,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_fourcc.h>
 
 bool
 curs507a_space(struct nv50_wndw *wndw)
@@ -99,6 +100,8 @@ curs507a_acquire(struct nv50_wndw *wndw, struct 
nv50_wndw_atom *asyw,
                 struct nv50_head_atom *asyh)
 {
        struct nv50_head *head = nv50_head(asyw->state.crtc);
+       struct drm_device *dev = head->base.base.dev;
+       struct drm_framebuffer *fb = asyw->state.fb;
        int ret;
 
        ret = drm_atomic_helper_check_plane_state(&asyw->state, &asyh->state,
@@ -109,12 +112,26 @@ curs507a_acquire(struct nv50_wndw *wndw, struct 
nv50_wndw_atom *asyw,
        if (ret || !asyh->curs.visible)
                return ret;
 
-       if (asyw->image.w != asyw->image.h)
+       if (asyw->image.w != asyw->image.h) {
+               drm_dbg_atomic(dev,
+                              "Invalid cursor image size: width (%d) must 
match height (%d)",
+                              asyw->image.w, asyw->image.h);
                return -EINVAL;
+       }
+       if (asyw->image.pitch[0] != asyw->image.w * fb->format->cpp[0]) {
+               drm_dbg_atomic(dev,
+                              "Invalid cursor image pitch: image must be 
packed (pitch = %d, width = %d)",
+                              asyw->image.pitch[0], asyw->image.w);
+               return -EINVAL;
+       }
 
        ret = head->func->curs_layout(head, asyw, asyh);
-       if (ret)
+       if (ret) {
+               drm_dbg_atomic(dev,
+                              "Invalid cursor image size: unsupported size 
%dx%d",
+                              asyw->image.w, asyw->image.h);
                return ret;
+       }
 
        return head->func->curs_format(head, asyw, asyh);
 }
-- 
2.30.0

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