From: Aaron Kling <[email protected]> The issue was determined to be two-fold:
1. The non-continuous clock dropping into LPM during blanks causes voltage drift at 120hz enough to affect the gamma curve. 2. The agressive horizontal blanking width did not allow enough settle time, further compounding the voltage drift. In addition to switching to continuous clock, burst mode is also enabled to further stabilize the blank intervals. Assisted-by: Gemini:2.5-Pro Signed-off-by: Aaron Kling <[email protected]> --- For the initial submission, the washed out colors were expected to need to be fixed by a color profile. However, further investigation showed there was a problem with the timings. --- drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c b/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c index 562dc573528dd..92f0c4f1587cb 100644 --- a/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c +++ b/drivers/gpu/drm/panel/panel-chipwealth-ch13726a.c @@ -128,11 +128,11 @@ static int ch13726a_unprepare(struct drm_panel *panel) static const struct drm_display_mode thor_bottom_modes[] = { { /* 120Hz */ - .clock = (1080 + 28 + 4 + 36) * (1240 + 16 + 4 + 8) * 120 / 1000, + .clock = (1080 + 60 + 8 + 60) * (1240 + 16 + 4 + 8) * 120 / 1000, .hdisplay = 1080, - .hsync_start = 1080 + 28, - .hsync_end = 1080 + 28 + 4, - .htotal = 1080 + 28 + 4 + 36, + .hsync_start = 1080 + 60, + .hsync_end = 1080 + 28 + 8, + .htotal = 1080 + 28 + 4 + 60, .vdisplay = 1240, .vsync_start = 1240 + 16, .vsync_end = 1240 + 16 + 4, @@ -281,7 +281,7 @@ static int ch13726a_probe(struct mipi_dsi_device *dsi) dsi->lanes = 4; dsi->format = MIPI_DSI_FMT_RGB888; dsi->mode_flags = MIPI_DSI_MODE_VIDEO | - MIPI_DSI_CLOCK_NON_CONTINUOUS; + MIPI_DSI_MODE_VIDEO_BURST; ctx->panel.prepare_prev_first = true; --- base-commit: 0d33d21e47d9dc66f91e44da3fc9220c74d93df7 change-id: 20260727-ch13726a-washout-54ef8fa65be6 Best regards, -- Aaron Kling <[email protected]>
