linux-kernel - [PATCH] drm/panel: novatek-nt36523: Set prepare_prev

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Date: Thu, 01 Feb 2024 23:17:40 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Jianhua Lu <lujianhua000@...il.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH] drm/panel: novatek-nt36523: Set prepare_prev_first

The .prepare callback contains the init sequence, so the DSI host *must*
be enabled at that point. Set the prepare_prev_first flag to ensure that.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/panel/panel-novatek-nt36523.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt36523.c b/drivers/gpu/drm/panel/panel-novatek-nt36523.c
index a189ce236328..32cae1bc9162 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt36523.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt36523.c
@@ -1270,6 +1270,8 @@ static int nt36523_probe(struct mipi_dsi_device *dsi)
 		return ret;
 	}
 
+	pinfo->panel.prepare_prev_first = true;
+
 	if (pinfo->desc->has_dcs_backlight) {
 		pinfo->panel.backlight = nt36523_create_backlight(dsi);
 		if (IS_ERR(pinfo->panel.backlight))

---
base-commit: 51b70ff55ed88edd19b080a524063446bcc34b62
change-id: 20240201-topic-3623_fix-9198419e5e47

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>