drm/radeon/kms: more atom parser fixes (v2)

shr/shl ops need the full dst rather than the pre-masked
version.  Fixes fdo bug 27478 and kernel bug 15738.

v2: remove some unsed vars, add comments

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index 58845e053b36..a8bf50042464 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -907,11 +907,16 @@ static void atom_op_shl(atom_exec_context *ctx, int *ptr, int arg)
         uint8_t attr = U8((*ptr)++), shift;
         uint32_t saved, dst;
         int dptr = *ptr;
+        uint32_t dst_align = atom_dst_to_src[(attr >> 3) & 7][(attr >> 6) & 3];
         SDEBUG("   dst: ");
         dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1);
+        /* op needs to full dst value */
+        dst = saved;
         shift = atom_get_src(ctx, attr, ptr);
         SDEBUG("   shift: %d\n", shift);
         dst <<= shift;
+        dst &= atom_arg_mask[dst_align];
+        dst >>= atom_arg_shift[dst_align];
         SDEBUG("   dst: ");
         atom_put_dst(ctx, arg, attr, &dptr, dst, saved);
 }
@@ -921,11 +926,16 @@ static void atom_op_shr(atom_exec_context *ctx, int *ptr, int arg)
         uint8_t attr = U8((*ptr)++), shift;
         uint32_t saved, dst;
         int dptr = *ptr;
+        uint32_t dst_align = atom_dst_to_src[(attr >> 3) & 7][(attr >> 6) & 3];
         SDEBUG("   dst: ");
         dst = atom_get_dst(ctx, arg, attr, ptr, &saved, 1);
+        /* op needs to full dst value */
+        dst = saved;
         shift = atom_get_src(ctx, attr, ptr);
         SDEBUG("   shift: %d\n", shift);
         dst >>= shift;
+        dst &= atom_arg_mask[dst_align];
+        dst >>= atom_arg_shift[dst_align];
         SDEBUG("   dst: ");
         atom_put_dst(ctx, arg, attr, &dptr, dst, saved);
 }