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authorHans Verkuil <hverkuil-cisco@xs4all.nl>2022-05-13 13:53:06 +0100
committerMauro Carvalho Chehab <mchehab@kernel.org>2022-06-20 10:30:30 +0100
commit5a531791edb249e41e00cf1cc580dbb09e2157ae (patch)
tree6d88a9c0366ab5c88988dae529ea57bb33673385 /include/media
parent691c3db0dc7616b3cc4ff0f52f956c9afa71b1cd (diff)
downloadlwn-5a531791edb249e41e00cf1cc580dbb09e2157ae.tar.gz
lwn-5a531791edb249e41e00cf1cc580dbb09e2157ae.zip
media: v4l2-tpg: add HDMI Video Guard Band test pattern
This inserts 4 pixels of the RGB color 0xab55ab at the left hand side of the image. This is only done for 3 or 4 byte RGB pixel formats. The HDMI TMDS encoding of this pixel value equals the Video Guard Band value as defined by HDMI (see section 5.2.2.1 in the HDMI 1.3 Specification) that preceeds the first actual pixel of a video line. If an HDMI receiver doesn't handle this correctly, then it might keep skipping these Video Guard Band patterns and end up with a shorter video line. So this is a nice pattern to test with. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/tpg/v4l2-tpg.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/media/tpg/v4l2-tpg.h b/include/media/tpg/v4l2-tpg.h
index 181dcbe777f3..a55088921d1d 100644
--- a/include/media/tpg/v4l2-tpg.h
+++ b/include/media/tpg/v4l2-tpg.h
@@ -210,6 +210,7 @@ struct tpg_data {
bool show_square;
bool insert_sav;
bool insert_eav;
+ bool insert_hdmi_video_guard_band;
/* Test pattern movement */
enum tpg_move_mode mv_hor_mode;
@@ -591,6 +592,21 @@ static inline void tpg_s_insert_eav(struct tpg_data *tpg, bool insert_eav)
tpg->insert_eav = insert_eav;
}
+/*
+ * This inserts 4 pixels of the RGB color 0xab55ab at the left hand side of the
+ * image. This is only done for 3 or 4 byte RGB pixel formats. This pixel value
+ * equals the Video Guard Band value as defined by HDMI (see section 5.2.2.1
+ * in the HDMI 1.3 Specification) that preceeds the first actual pixel. If the
+ * HDMI receiver doesn't handle this correctly, then it might keep skipping
+ * these Video Guard Band patterns and end up with a shorter video line. So this
+ * is a nice pattern to test with.
+ */
+static inline void tpg_s_insert_hdmi_video_guard_band(struct tpg_data *tpg,
+ bool insert_hdmi_video_guard_band)
+{
+ tpg->insert_hdmi_video_guard_band = insert_hdmi_video_guard_band;
+}
+
void tpg_update_mv_step(struct tpg_data *tpg);
static inline void tpg_s_mv_hor_mode(struct tpg_data *tpg,