From dd0d0a487172bbe9626efc59a43d5dfbea64cdd4 Mon Sep 17 00:00:00 2001 From: Dmitry Baryshkov Date: Mon, 13 Apr 2026 17:05:31 +0300 Subject: [PATCH] drm/panel: himax-hx8394: set prepare_prev_first 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 Reviewed-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260413-waveshare-dsi-touch-v3-8-3aeb53022c32@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/panel/panel-himax-hx8394.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c index c4d3e09a228da..d64f3521eb15b 100644 --- a/drivers/gpu/drm/panel/panel-himax-hx8394.c +++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c @@ -792,6 +792,8 @@ static int hx8394_probe(struct mipi_dsi_device *dsi) if (ret) return ret; + ctx->panel.prepare_prev_first = true; + drm_panel_add(&ctx->panel); ret = mipi_dsi_attach(dsi); -- 2.47.3