drm/panel: raydium-rm67200: Move initialization from enable() to prepare stage

The DSI host has different modes in prepare() and enable() functions,
prepare() is in LP command mode and enable() is in HS video mode.

>From our experience, generally the initialization sequence needs to be
sent in the LP command mode.

Move the setup init function from enable() to prepare() to fix a display
shift on rk3568 evb.

Tested on rk3568/rk3576/rk3588 EVB.

Signed-off-by: Andy Yan <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Andy Yan

drivers/gpu/drm/panel/panel-raydium-rm67200.c

@@ -320,6 +320,7 @@ static void w552793baa_setup(struct mipi_dsi_multi_context *ctx)
 static int raydium_rm67200_prepare(struct drm_panel *panel)
 {
 	struct raydium_rm67200 *ctx = to_raydium_rm67200(panel);
+	struct mipi_dsi_multi_context mctx = { .dsi = ctx->dsi };
 	int ret;
 
 	ret = regulator_bulk_enable(ctx->num_supplies, ctx->supplies);
@@ -330,6 +331,12 @@ static int raydium_rm67200_prepare(struct drm_panel *panel)
 
 	msleep(60);
 
+	ctx->panel_info->panel_setup(&mctx);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&mctx);
+	mipi_dsi_msleep(&mctx, 120);
+	mipi_dsi_dcs_set_display_on_multi(&mctx);
+	mipi_dsi_msleep(&mctx, 30);
+
 	return 0;
 }
 
@@ -345,20 +352,6 @@ static int raydium_rm67200_unprepare(struct drm_panel *panel)
 	return 0;
 }
 
-static int raydium_rm67200_enable(struct drm_panel *panel)
-{
-	struct raydium_rm67200 *rm67200 = to_raydium_rm67200(panel);
-	struct mipi_dsi_multi_context ctx = { .dsi = rm67200->dsi };
-
-	rm67200->panel_info->panel_setup(&ctx);
-	mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);
-	mipi_dsi_msleep(&ctx, 120);
-	mipi_dsi_dcs_set_display_on_multi(&ctx);
-	mipi_dsi_msleep(&ctx, 30);
-
-	return ctx.accum_err;
-}
-
 static int raydium_rm67200_disable(struct drm_panel *panel)
 {
 	struct raydium_rm67200 *rm67200 = to_raydium_rm67200(panel);
@@ -383,7 +376,6 @@ static const struct drm_panel_funcs raydium_rm67200_funcs = {
 	.prepare = raydium_rm67200_prepare,
 	.unprepare = raydium_rm67200_unprepare,
 	.get_modes = raydium_rm67200_get_modes,
-	.enable = raydium_rm67200_enable,
 	.disable = raydium_rm67200_disable,
 };