drm/ast: Fix test for VGA enabled

The test to see if VGA was already enabled is doing an unnecessary
second test from a register that may or may not have been initialized
to a valid value. Remove it.

Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: <stable@vger.kernel.org>
Acked-by: Joel Stanley <joel@jms.id.au>
Tested-by: Y.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index c15f643..a5a7809 100644 (file)
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -59,13 +59,9 @@ bool ast_is_vga_enabled(struct drm_device *dev)
                /* TODO 1180 */
        } else {
                ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
-               if (ch) {
-                       ast_open_key(ast);
-                       ch = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff);
-                       return ch & 0x04;
-               }
+               return !!(ch & 0x01);
        }
-       return 0;
+       return false;
 }
 
 static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };