From: Dmitry Baryshkov <[email protected]> [ Upstream commit b55a4b5d4769a650f52ea3f1ae680610169d125e ]
Sending DSI commands from the prepare() callback requires DSI link to be up at that point. For DSI hosts is guaranteed only if the panel driver sets the .prepare_prev_first flag. Set it to let these panels work with the DSI hosts which don't power on the link in their .mode_set callback. Reviewed-by: Linus Walleij <[email protected]> Tested-by: Riccardo Mereu <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Dmitry Baryshkov <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- LLM Generated explanations, may be completely bogus: The background `git log -S'panel-jadard-jd9365da-h3'` search finished (took ~3 minutes). It only surfaced merge commits — the first hit is `5d324e5159d9e` (usb-6.18-rc8 merge) — which matches what we saw earlier: this stable tree’s history doesn’t give a clean upstream “driver added in commit X” trail. That doesn’t change the backport assessment. The driver is present in 6.18.43, the bug (missing `prepare_prev_first`) is confirmed, the patch applies cleanly, and the verdict remains **YES**. drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c index 5c2530598ddb9..9e5287829b952 100644 --- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c +++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c @@ -1157,6 +1157,8 @@ static int jadard_dsi_probe(struct mipi_dsi_device *dsi) if (ret) return ret; + jadard->panel.prepare_prev_first = true; + drm_panel_add(&jadard->panel); mipi_dsi_set_drvdata(dsi, jadard); -- 2.53.0
