This is a note to let you know that I've just added the patch titled
drm/edid: fix AVI infoframe aspect ratio handling
to the 5.15-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-edid-fix-avi-infoframe-aspect-ratio-handling.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1cbc1f0d324ba6c4d1b10ac6362b5e0b029f63d5 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Wed, 4 Jan 2023 12:05:16 +0200
Subject: drm/edid: fix AVI infoframe aspect ratio handling
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Jani Nikula <jani.nikula@xxxxxxxxx>
commit 1cbc1f0d324ba6c4d1b10ac6362b5e0b029f63d5 upstream.
We try to avoid sending VICs defined in the later specs in AVI
infoframes to sinks that conform to the earlier specs, to not upset
them, and use 0 for the VIC instead. However, we do this detection and
conversion to 0 too early, as we'll need the actual VIC to figure out
the aspect ratio.
In particular, for a mode with 64:27 aspect ratio, 0 for VIC fails the
AVI infoframe generation altogether with -EINVAL.
Separate the VIC lookup from the "filtering", and postpone the
filtering, to use the proper VIC for aspect ratio handling, and the 0
VIC for the infoframe video code as needed.
Reported-by: William Tseng <william.tseng@xxxxxxxxx>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6153
References: https://lore.kernel.org/r/20220920062316.43162-1-william.tseng@xxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/c3e78cc6d01ed237f71ad0038826b08d83d75eef.1672826282.git.jani.nikula@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5598,8 +5598,6 @@ static u8 drm_mode_hdmi_vic(const struct
static u8 drm_mode_cea_vic(const struct drm_connector *connector,
const struct drm_display_mode *mode)
{
- u8 vic;
-
/*
* HDMI spec says if a mode is found in HDMI 1.4b 4K modes
* we should send its VIC in vendor infoframes, else send the
@@ -5609,13 +5607,18 @@ static u8 drm_mode_cea_vic(const struct
if (drm_mode_hdmi_vic(connector, mode))
return 0;
- vic = drm_match_cea_mode(mode);
+ return drm_match_cea_mode(mode);
+}
- /*
- * HDMI 1.4 VIC range: 1 <= VIC <= 64 (CEA-861-D) but
- * HDMI 2.0 VIC range: 1 <= VIC <= 107 (CEA-861-F). So we
- * have to make sure we dont break HDMI 1.4 sinks.
- */
+/*
+ * Avoid sending VICs defined in HDMI 2.0 in AVI infoframes to sinks that
+ * conform to HDMI 1.4.
+ *
+ * HDMI 1.4 (CTA-861-D) VIC range: [1..64]
+ * HDMI 2.0 (CTA-861-F) VIC range: [1..107]
+ */
+static u8 vic_for_avi_infoframe(const struct drm_connector *connector, u8 vic)
+{
if (!is_hdmi2_sink(connector) && vic > 64)
return 0;
@@ -5691,7 +5694,7 @@ drm_hdmi_avi_infoframe_from_display_mode
picture_aspect = HDMI_PICTURE_ASPECT_NONE;
}
- frame->video_code = vic;
+ frame->video_code = vic_for_avi_infoframe(connector, vic);
frame->picture_aspect = picture_aspect;
frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
frame->scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
Patches currently in stable-queue which might be from jani.nikula@xxxxxxxxx are
queue-5.15/drm-i915-don-t-use-bar-mappings-for-ring-buffers-with-llc.patch
queue-5.15/drm-i915-quirks-add-inverted-backlight-quirk-for-hp-14-r206nv.patch
queue-5.15/drm-edid-fix-avi-infoframe-aspect-ratio-handling.patch
