The patch below does not apply to the 5.8-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 244d012801dae30c91983b360457c78d481584b0 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@xxxxxxx>
Date: Thu, 16 Jul 2020 14:53:52 +0200
Subject: [PATCH] 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 <tzimmermann@xxxxxxx>
Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Fixes: bad09da6deab ("drm/ast: Fixed vram size incorrect issue on POWER")
Cc: Joel Stanley <joel@xxxxxxxxx>
Cc: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx>
Cc: "Y.C. Chen" <yc_chen@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.11+
Link: https://patchwork.freedesktop.org/patch/msgid/20200716125353.31512-6-tzimmermann@xxxxxxx
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index b162cc82204d..87e5baded2a7 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/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;
