https://bugs.freedesktop.org/show_bug.cgi?id=65591
Priority: medium
Bug ID: 65591
Assignee: openchrome-devel@lists.freedesktop.org
Summary: [drm-openchrome] Commit
484c66c400daa76bd6840f195e8effa9d39dfb3c breaks KMS on
VX900 with HDMI
Severity: major
Classification: Unclassified
OS: All
Reporter: bugs.freedesktop@hardfalcon.net
Hardware: All
Status: NEW
Version: git
Component: Driver/openchrome
Product: xorg
With commit 484c66c400daa76bd6840f195e8effa9d39dfb3c, the following change
(among others) was introduced in the file drivers/gpu/drm/via/via_hdmi.c:
@@ -432,8 +433,8 @@ via_ddc_read_bytes_by_hdmi(struct drm_via_private
*dev_priv, unsigned char *bloc
if (status)
status = via_check_hdmi_i2c_status(dev_priv, 0x0008, true);
-/* Offset - always read at start of buffer */
-temp = 0;
+/* Offset */
+temp = offset;
temp <<= 16;
temp |= VIA_READ(0xC0B4) & 0xFF00;
VIA_WRITE(0xC0B4, temp);
This breaks KMS on my VX900, the (1920x1080 HDMI) display goes blank/into
standby mode immediately after the module was loaded (from initrd). Changing
the line
temp = offset;
back to
temp = 0;
fixes the problem (but of course this renders the offset parameter of the
function useless).
My guess is that line 525 in the same file needs to be changed from
offset = (valid_extensions + 1) * EDID_LENGTH;
to
offset = (valid_extensions) * EDID_LENGTH;
I haven't tested this, though.
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