[PATCH v7 07/12] drm: panel: ilitek-ili9881c: Enable prepare_prev_first for k101_im2byl02

[Jagan Teki <jagan@amarulasolutions.com>]

Enable the drm panel prepare_prev_first flag for k101_im2byl02 panel
so-that the previous controller should be prepared first before the
prepare for the panel is called.
                   
This makes sure that the previous controller(sun6i-mipi-dsi), likely to
be a DSI host controller should be initialized to LP-11 before the panel
is powered up.

Cc: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v7:
- new patch

 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index 1ec696adf9de..102a1df0cea0 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -42,6 +42,7 @@ struct ili9881c_desc {
 	const size_t init_length;
 	const struct drm_display_mode *mode;
 	const unsigned long mode_flags;
+	bool prepare_prev_first;
 };
 
 struct ili9881c {
@@ -891,6 +892,7 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 
 	drm_panel_init(&ctx->panel, &dsi->dev, &ili9881c_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = ctx->desc->prepare_prev_first;
 
 	ctx->power = devm_regulator_get(&dsi->dev, "power");
 	if (IS_ERR(ctx->power))
@@ -942,6 +944,7 @@ static const struct ili9881c_desc k101_im2byl02_desc = {
 	.init_length = ARRAY_SIZE(k101_im2byl02_init),
 	.mode = &k101_im2byl02_default_mode,
 	.mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
+	.prepare_prev_first = true,
 };
 
 static const struct ili9881c_desc w552946aba_desc = {
-- 
2.25.1