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drm/panel: visionox-rm69299: Make use of prepare_prev_first

The DSI link must be powered up to let panel driver to talk to the panel
during prepare() callback execution. Set the prepare_prev_first flag to
guarantee this.

Fixes: 9e15123eca79 ("drm/msm/dsi: Stop unconditionally powering up DSI hosts at modeset")
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/20260417-axolotl-display-v2-1-8ce5341e46c2@ixit.cz

authored by

Guido Günther and committed by
Douglas Anderson 4a92ef0c 6bf7969a

+2
+2
drivers/gpu/drm/panel/panel-visionox-rm69299.c
··· 376 376 return PTR_ERR(ctx->reset_gpio); 377 377 } 378 378 379 + ctx->panel.prepare_prev_first = true; 380 + 379 381 ctx->panel.backlight = visionox_rm69299_create_backlight(ctx); 380 382 if (IS_ERR(ctx->panel.backlight)) 381 383 return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),