Commit c1230df7 authored by Paulo Zanoni's avatar Paulo Zanoni Committed by Daniel Vetter

drm/i915: enable dip before writing data on gen4

While testing with the intel_infoframes tool on gen4, I see that when
video DIP is disabled, what we write to the DATA memory is not exactly
what we read back later.

This regression has been introduce in

commit 64a8fc01
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Thu Sep 22 11:16:00 2011 +0530

    drm/i915: fix ILK+ infoframe support

That commit was setting VIDEO_DIP_CTL to 0 when initializing, which
caused the problem.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43947
Cc: stable@kernel.org
Tested-by: default avatarYang Guang <guang.a.yang@intel.com>
Signed-off-by: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: default avatarEugeni Dodonov <eugeni.dodonov@intel.com>
[danvet: Pimped commit message by using the usual commit citation
layout.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 62004978
......@@ -136,7 +136,7 @@ static void i9xx_write_infoframe(struct drm_encoder *encoder,
val &= ~VIDEO_DIP_SELECT_MASK;
I915_WRITE(VIDEO_DIP_CTL, val | port | flags);
I915_WRITE(VIDEO_DIP_CTL, VIDEO_DIP_ENABLE | val | port | flags);
for (i = 0; i < len; i += 4) {
I915_WRITE(VIDEO_DIP_DATA, *data);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment