drm/radeon/kms: add support to atom parser for FB read/write

FB read/write really doesn't need to access the actual VRAM, we
can just use a scratch area. This is required for using atom displayport
calls later.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index d67c42555ab9..85abc0850e7f 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -263,10 +263,10 @@ static uint32_t atom_get_src_int(atom_exec_context *ctx, uint8_t attr,
         case ATOM_ARG_FB:
                 idx = U8(*ptr);
                 (*ptr)++;
+                val = gctx->scratch[((gctx->fb_base + idx) / 4)];
                 if (print)
                         DEBUG("FB[0x%02X]", idx);
-                printk(KERN_INFO "FB access is not implemented.\n");
-                return 0;
+                break;
         case ATOM_ARG_IMM:
                 switch (align) {
                 case ATOM_SRC_DWORD:
@@ -488,9 +488,9 @@ static void atom_put_dst(atom_exec_context *ctx, int arg, uint8_t attr,
         case ATOM_ARG_FB:
                 idx = U8(*ptr);
                 (*ptr)++;
+                gctx->scratch[((gctx->fb_base + idx) / 4)] = val;
                 DEBUG("FB[0x%02X]", idx);
-                printk(KERN_INFO "FB access is not implemented.\n");
-                return;
+                break;
         case ATOM_ARG_PLL:
                 idx = U8(*ptr);
                 (*ptr)++;