FAILED: patch "[PATCH] drm/ast: Fix black screen after resume" failed to apply to 6.6-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.6-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@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 12c35c5582acb0fd8f7713ffa75f450766022ff1
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024080750-lance-overcrowd-731e@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

12c35c5582ac ("drm/ast: Fix black screen after resume")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 12c35c5582acb0fd8f7713ffa75f450766022ff1 Mon Sep 17 00:00:00 2001
From: Jammy Huang <jammy_huang@aspeedtech.com>
Date: Thu, 18 Jul 2024 11:03:52 +0800
Subject: [PATCH] drm/ast: Fix black screen after resume

Suspend will disable pcie device. Thus, resume should do full hw
initialization again.
Add some APIs to ast_drm_thaw() before ast_post_gpu() to fix the issue.

v2:
- fix function-call arguments

Fixes: 5b71707dd13c ("drm/ast: Enable and unlock device access early during init")
Reported-by: Cary Garrett <cogarre@gmail.com>
Closes: https://lore.kernel.org/dri-devel/8ce1e1cc351153a890b65e62fed93b54ccd43f6a.camel@gmail.com/
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.6+
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718030352.654155-1-jammy_huang@aspeedtech.com

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index f8c49ba68e78..af2368f6f00f 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -391,6 +391,11 @@ static int ast_drm_freeze(struct drm_device *dev)
 
 static int ast_drm_thaw(struct drm_device *dev)
 {
+	struct ast_device *ast = to_ast_device(dev);
+
+	ast_enable_vga(ast->ioregs);
+	ast_open_key(ast->ioregs);
+	ast_enable_mmio(dev->dev, ast->ioregs);
 	ast_post_gpu(dev);
 
 	return drm_mode_config_helper_resume(dev);