[PATCH 03/11] drm/rockchip: inno_hdmi: Fix video timing

Alex Bee
2023-12-13T19:51:54Z

The controller wants the difference between *total and *sync_start in
the HDMI_VIDEO_EXT_*DELAY registers. Otherwise the signal is very
unstable for certain non-VIC modes.
See downstream commit [0]

[0] https://github.com/rockchip-linux/kernel/commit/8eb559f2502c

Fixes: 412d4ae6b7a5 ("drm/rockchip: hdmi: add Innosilicon HDMI support")
Co-developed-by: Zheng Yang <zhengyang@rock-chips.com>
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
Signed-off-by: Alex Bee <knaerzche@gmail.com>
---
drivers/gpu/drm/rockchip/inno_hdmi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c
index 6e5b922a121e..345253e033c5 100644
--- a/drivers/gpu/drm/rockchip/inno_hdmi.c
+++ b/drivers/gpu/drm/rockchip/inno_hdmi.c
@@ -412,7 +412,7 @@ static int inno_hdmi_config_video_timing(struct inno_hdmi *hdmi,
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HBLANK_L, value & 0xFF);
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HBLANK_H, (value >> 8) & 0xFF);

- value = mode->hsync_start - mode->hdisplay;
+ value = mode->htotal - mode->hsync_start;
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDELAY_L, value & 0xFF);
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDELAY_H, (value >> 8) & 0xFF);

@@ -427,7 +427,7 @@ static int inno_hdmi_config_video_timing(struct inno_hdmi *hdmi,
value = mode->vtotal - mode->vdisplay;
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VBLANK, value & 0xFF);

- value = mode->vsync_start - mode->vdisplay;
+ value = mode->vtotal - mode->vsync_start;
hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VDELAY, value & 0xFF);

value = mode->vsync_end - mode->vsync_start;
--
2.43.0