Patch "drm/ast: Fix black screen after resume" has been added to the 6.6-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    drm/ast: Fix black screen after resume

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-ast-fix-black-screen-after-resume.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


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

From: Jammy Huang <jammy_huang at aspeedtech.com>

commit 12c35c5582acb0fd8f7713ffa75f450766022ff1 upstream.

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 at gmail.com>
Closes: https://lore.kernel.org/dri-devel/8ce1e1cc351153a890b65e62fed93b54ccd43f6a.camel@gmail.com/
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Jocelyn Falempe <jfalempe at redhat.com>
Cc: Dave Airlie <airlied at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v6.6+
Signed-off-by: Jammy Huang <jammy_huang at aspeedtech.com>
Reviewed-by: Thomas Zimmermann <tzimmermann at suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718030352.654155-1-jammy_huang@aspeedtech.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/ast/ast_drv.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -138,6 +138,11 @@ static int ast_drm_freeze(struct drm_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);


Patches currently in stable-queue which might be from jammy_huang at aspeedtech.com are

queue-6.6/drm-ast-fix-black-screen-after-resume.patch