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drm/panel: himax-hx8394: set prepare_prev_first

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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 <linusw@kernel.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patch.msgid.link/20260413-waveshare-dsi-touch-v3-8-3aeb53022c32@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Dmitry Baryshkov
2026-04-13 17:05:31 +03:00
parent 1af0feaca1
commit dd0d0a4871
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/panel/panel-himax-hx8394.c
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@@ -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);