drm/ast: Fix start address computation

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2166219
Upstream Status: git://anongit.freedesktop.org/drm/drm-misc

commit 7484a5b
Author:     Jocelyn Falempe <jfalempe@redhat.com>
AuthorDate: Thu Feb  9 10:44:17 2023 +0100
Commit:     Jocelyn Falempe <jfalempe@redhat.com>
CommitDate: Fri Feb 10 14:32:57 2023 +0100

    During the driver conversion to shmem, the start address for the
    scanout buffer was set to the base PCI address.
    In most cases it works because only the lower 24bits are used, and
    due to alignment it was almost always 0.
    But on some unlucky hardware, it's not the case, and some uninitialized
    memory is displayed on the BMC.
    With shmem, the primary plane is always at offset 0 in GPU memory.

     * v2: rewrite the patch to set the offset to 0. (Thomas Zimmermann)
     * v3: move the change to plane_init() and also fix the cursor plane.
           (Jammy Huang)

    Tested on a sr645 affected by this bug.

    Fixes: f2fa5a9 ("drm/ast: Convert ast to SHMEM")
    Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
    Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
    Reviewed-by: Jammy Huang <jammy_huang@aspeedtech.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230209094417.21630-1-jfalempe@redhat.com

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>

Author: Jocelyn Falempe

drivers/gpu/drm/ast/ast_mode.c

@@ -716,7 +716,7 @@ static int ast_primary_plane_init(struct ast_private *ast)
 	struct ast_plane *ast_primary_plane = &ast->primary_plane;
 	struct drm_plane *primary_plane = &ast_primary_plane->base;
 	void __iomem *vaddr = ast->vram;
-	u64 offset = ast->vram_base;
+	u64 offset = 0; /* with shmem, the primary plane is always at offset 0 */
 	unsigned long cursor_size = roundup(AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE, PAGE_SIZE);
 	unsigned long size = ast->vram_fb_available - cursor_size;
 	int ret;
@@ -974,7 +974,7 @@ static int ast_cursor_plane_init(struct ast_private *ast)
 		return -ENOMEM;
 
 	vaddr = ast->vram + ast->vram_fb_available - size;
-	offset = ast->vram_base + ast->vram_fb_available - size;
+	offset = ast->vram_fb_available - size;
 
 	ret = ast_plane_init(dev, ast_cursor_plane, vaddr, offset, size,
 			     0x01, &ast_cursor_plane_funcs,