linux-kernel - [PATCH 5.8 004/148] drm/ast: Initialize DRAM type before posting GPU

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Date:   Mon, 24 Aug 2020 10:28:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Zimmermann <tzimmermann@...e.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        "Y.C. Chen" <yc_chen@...eedtech.com>,
        Dave Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 004/148] drm/ast: Initialize DRAM type before posting GPU

From: Thomas Zimmermann <tzimmermann@...e.de>

[ Upstream commit 244d012801dae30c91983b360457c78d481584b0 ]

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@...e.de>
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Fixes: bad09da6deab ("drm/ast: Fixed vram size incorrect issue on POWER")
Cc: Joel Stanley <joel@....id.au>
Cc: Y.C. Chen <yc_chen@...eedtech.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Gerd Hoffmann <kraxel@...hat.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Emil Velikov <emil.l.velikov@...il.com>
Cc: "Y.C. Chen" <yc_chen@...eedtech.com>
Cc: <stable@...r.kernel.org> # v4.11+
Link: https://patchwork.freedesktop.org/patch/msgid/20200716125353.31512-6-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/ast/ast_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index f48a9f62368c0..99c11b51f0207 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -458,9 +458,6 @@ 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;
@@ -469,6 +466,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
 		 ast->mclk, ast->dram_type,
 		 ast->dram_bus_width, ast->vram_size);
 
+	if (need_post)
+		ast_post_gpu(dev);
+
 	ret = ast_mm_init(ast);
 	if (ret)
 		goto out_free;
-- 
2.25.1