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<div class="moz-cite-prefix">On 2023/2/9 下午 05:55, Thomas Zimmermann
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:76785a76-281d-f847-5904-d8df361aa0b4@suse.de">
<br>
<br>
Am 09.02.23 um 10:44 schrieb Jocelyn Falempe:
<br>
<blockquote type="cite">During the driver conversion to shmem, the
start address for the
<br>
scanout buffer was set to the base PCI address.
<br>
In most cases it works because only the lower 24bits are used,
and
<br>
due to alignment it was almost always 0.
<br>
But on some unlucky hardware, it's not the case, and some
unitilized
<br>
</blockquote>
<br>
'uninitialized'
<br>
<br>
<blockquote type="cite">memory is displayed on the BMC.
<br>
With shmem, the primary plane is always at offset 0 in GPU
memory.
<br>
<br>
* v2: rewrite the patch to set the offset to 0. (Thomas
Zimmermann)
<br>
* v3: move the change to plane_init() and also fix the cursor
plane.
<br>
(Jammy Huang)
<br>
<br>
Tested on a sr645 affected by this bug.
<br>
<br>
Fixes: f2fa5a99ca81 ("drm/ast: Convert ast to SHMEM")
<br>
Signed-off-by: Jocelyn Falempe <a class="moz-txt-link-rfc2396E" href="mailto:jfalempe@redhat.com"><jfalempe@redhat.com></a>
<br>
</blockquote>
<br>
Reviewed-by: Thomas Zimmermann <a class="moz-txt-link-rfc2396E" href="mailto:tzimmermann@suse.de"><tzimmermann@suse.de></a>
<br>
</blockquote>
<p>Reviewed-by: Jammy Huang <a class="moz-txt-link-rfc2396E"
href="mailto:tzimmermann@suse.de"><</a><a
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<style>
/* Style Definitions */
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{mso-style-name:表格內文;
mso-tstyle-rowband-size:0;
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<![endif]--><span style="font-size:11.0pt;font-family:
"Calibri",sans-serif;mso-fareast-font-family:新細明體;mso-ansi-language:EN-US;
mso-fareast-language:ZH-TW;mso-bidi-language:AR-SA"
lang="EN-US">jammy_huang@aspeedtech.com</span>></a></p>
<blockquote type="cite"
cite="mid:76785a76-281d-f847-5904-d8df361aa0b4@suse.de">
<br>
<blockquote type="cite">---
<br>
drivers/gpu/drm/ast/ast_mode.c | 4 ++--
<br>
1 file changed, 2 insertions(+), 2 deletions(-)
<br>
<br>
diff --git a/drivers/gpu/drm/ast/ast_mode.c
b/drivers/gpu/drm/ast/ast_mode.c
<br>
index c7443317c747..66a4a41c3fe9 100644
<br>
--- a/drivers/gpu/drm/ast/ast_mode.c
<br>
+++ b/drivers/gpu/drm/ast/ast_mode.c
<br>
@@ -714,7 +714,7 @@ static int ast_primary_plane_init(struct
ast_private *ast)
<br>
struct ast_plane *ast_primary_plane =
&ast->primary_plane;
<br>
struct drm_plane *primary_plane =
&ast_primary_plane->base;
<br>
void __iomem *vaddr = ast->vram;
<br>
- u64 offset = ast->vram_base;
<br>
+ u64 offset = 0; /* with shmem, the primary plane is always
at offset 0 */
<br>
unsigned long cursor_size = roundup(AST_HWC_SIZE +
AST_HWC_SIGNATURE_SIZE, PAGE_SIZE);
<br>
unsigned long size = ast->vram_fb_available -
cursor_size;
<br>
int ret;
<br>
@@ -972,7 +972,7 @@ static int ast_cursor_plane_init(struct
ast_private *ast)
<br>
return -ENOMEM;
<br>
vaddr = ast->vram + ast->vram_fb_available - size;
<br>
- offset = ast->vram_base + ast->vram_fb_available -
size;
<br>
+ offset = ast->vram_fb_available - size;
<br>
ret = ast_plane_init(dev, ast_cursor_plane, vaddr,
offset, size,
<br>
0x01, &ast_cursor_plane_funcs,
<br>
</blockquote>
<br>
</blockquote>
<pre class="moz-signature" cols="72">--
Best Regards
Jammy</pre>
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