[PATCH v7 05/12] drm: panel: sitronix-st7703: Enable prepare_prev_first for xbd599

[Jagan Teki]

Enable the drm panel prepare_prev_first flag for xbd599 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: Ondrej Jirman <megous at megous.com>
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
Changes for v7:
- new patch

 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
index 6747ca237ced..6e6112f5d971 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
@@ -65,6 +65,7 @@ struct st7703_panel_desc {
 	unsigned int lanes;
 	unsigned long mode_flags;
 	enum mipi_dsi_pixel_format format;
+	bool prepare_prev_first;
 	int (*init_sequence)(struct st7703 *ctx);
 };
 
@@ -335,6 +336,7 @@ static const struct st7703_panel_desc xbd599_desc = {
 	.lanes = 4,
 	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
 	.format = MIPI_DSI_FMT_RGB888,
+	.prepare_prev_first = true,
 	.init_sequence = xbd599_init_sequence,
 };
 
@@ -544,6 +546,7 @@ static int st7703_probe(struct mipi_dsi_device *dsi)
 
 	drm_panel_init(&ctx->panel, dev, &st7703_drm_funcs,
 		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first = ctx->desc->prepare_prev_first;
 
 	ret = drm_panel_of_backlight(&ctx->panel);
 	if (ret)
-- 
2.25.1