drm/ast: Initialize DRAM type before posting GPU

Posting the GPU requires the correct DRAM type to be stored in
struct ast_private. Therefore first initialize the DRAM info and
then post the GPU. This restores the original order of instructions
in this function.

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Fixes: bad09da ("drm/ast: Fixed vram size incorrect issue on POWER")
Cc: Joel Stanley <[email protected]>
Cc: Y.C. Chen <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: "Y.C. Chen" <[email protected]>
Cc: <[email protected]> # v4.11+
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/gpu/drm/ast/ast_main.c

@@ -418,15 +418,15 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
 
 	ast_detect_chip(dev, &need_post);
 
-	if (need_post)
-		ast_post_gpu(dev);
-
 	ret = ast_get_dram_info(dev);
 	if (ret)
 		goto out_free;
 	drm_info(dev, "dram MCLK=%u Mhz type=%d bus_width=%d\n",
 		 ast->mclk, ast->dram_type, ast->dram_bus_width);
 
+	if (need_post)
+		ast_post_gpu(dev);
+
 	ret = ast_mm_init(ast);
 	if (ret)
 		goto out_free;