diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c index 868752c8c115..a1f803770b61 100644 --- a/drivers/gpu/drm/vc4/vc4_dsi.c +++ b/drivers/gpu/drm/vc4/vc4_dsi.c @@ -1460,6 +1460,15 @@ static const struct drm_bridge_funcs vc4_dsi_bridge_funcs = { .mode_fixup = vc4_dsi_bridge_mode_fixup, }; +static void vc4_dsi_reset_fifo(struct drm_encoder *encoder) +{ + struct vc4_dsi *dsi = to_vc4_dsi(encoder); + u32 val; + + val = DSI_PORT_READ(CTRL); + DSI_PORT_WRITE(CTRL, val | DSI0_CTRL_CLR_PBCF); +} + static int vc4_dsi_late_register(struct drm_encoder *encoder) { struct drm_device *drm = encoder->dev; @@ -1690,6 +1699,9 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data) dsi->encoder.type = dsi->variant->port ? VC4_ENCODER_TYPE_DSI1 : VC4_ENCODER_TYPE_DSI0; + if (dsi->encoder.type == VC4_ENCODER_TYPE_DSI0) + dsi->encoder.vblank = vc4_dsi_reset_fifo; + dsi->regs = vc4_ioremap_regs(pdev, 0); if (IS_ERR(dsi->regs)) return PTR_ERR(dsi->regs);