コード例 #1
0
/**
 * drm_atomic_get_crtc_state - get crtc state
 * @state: global atomic state object
 * @crtc: crtc to get state object for
 *
 * This function returns the crtc state for the given crtc, allocating it if
 * needed. It will also grab the relevant crtc lock to make sure that the state
 * is consistent.
 *
 * Returns:
 *
 * Either the allocated state or the error code encoded into the pointer. When
 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 * entire atomic sequence must be restarted. All other errors are fatal.
 */
struct drm_crtc_state *
drm_atomic_get_crtc_state(struct drm_atomic_state *state,
			  struct drm_crtc *crtc)
{
	int ret, index = drm_crtc_index(crtc);
	struct drm_crtc_state *crtc_state;

	crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
	if (crtc_state)
		return crtc_state;

	ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
	if (ret)
		return ERR_PTR(ret);

	crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
	if (!crtc_state)
		return ERR_PTR(-ENOMEM);

	state->crtc_states[index] = crtc_state;
	state->crtcs[index] = crtc;
	crtc_state->state = state;

	DRM_DEBUG_ATOMIC("Added [CRTC:%d] %p state to %p\n",
			 crtc->base.id, crtc_state, state);

	return crtc_state;
}
コード例 #2
0
ファイル: malidp_mw.c プロジェクト: avagin/linux
int malidp_mw_connector_init(struct drm_device *drm)
{
	struct malidp_drm *malidp = drm->dev_private;
	u32 *formats;
	int ret, n_formats;

	if (!malidp->dev->hw->enable_memwrite)
		return 0;

	malidp->mw_connector.encoder.possible_crtcs = 1 << drm_crtc_index(&malidp->crtc);
	drm_connector_helper_add(&malidp->mw_connector.base,
				 &malidp_mw_connector_helper_funcs);

	formats = get_writeback_formats(malidp, &n_formats);
	if (!formats)
		return -ENOMEM;

	ret = drm_writeback_connector_init(drm, &malidp->mw_connector,
					   &malidp_mw_connector_funcs,
					   &malidp_mw_encoder_helper_funcs,
					   formats, n_formats);
	kfree(formats);
	if (ret)
		return ret;

	return 0;
}
コード例 #3
0
ファイル: kirin_drm_ade.c プロジェクト: dznm/linux
static int ade_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
			 struct drm_plane *plane)
{
	struct kirin_drm_private *priv = dev->dev_private;
	struct device_node *port;
	int ret;

	/* set crtc port so that
	 * drm_of_find_possible_crtcs call works
	 */
	port = of_get_child_by_name(dev->dev->of_node, "port");
	if (!port) {
		DRM_ERROR("no port node found in %s\n",
			  dev->dev->of_node->full_name);
		return -EINVAL;
	}
	of_node_put(port);
	crtc->port = port;

	ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
					&ade_crtc_funcs, NULL);
	if (ret) {
		DRM_ERROR("failed to init crtc.\n");
		return ret;
	}

	drm_crtc_helper_add(crtc, &ade_crtc_helper_funcs);
	priv->crtc[drm_crtc_index(crtc)] = crtc;

	return 0;
}
コード例 #4
0
ファイル: rockchip_drm_fb.c プロジェクト: 513855417/linux
static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc)
{
	struct rockchip_drm_private *priv = crtc->dev->dev_private;
	int pipe = drm_crtc_index(crtc);
	const struct rockchip_crtc_funcs *crtc_funcs = priv->crtc_funcs[pipe];

	if (crtc_funcs && crtc_funcs->wait_for_update)
		crtc_funcs->wait_for_update(crtc);
}
コード例 #5
0
ファイル: rockchip_drm_drv.c プロジェクト: 020gzh/linux
void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
{
	int pipe = drm_crtc_index(crtc);
	struct rockchip_drm_private *priv = crtc->dev->dev_private;

	if (pipe > ROCKCHIP_MAX_CRTC)
		return;

	priv->crtc_funcs[pipe] = NULL;
}
コード例 #6
0
ファイル: rockchip_drm_drv.c プロジェクト: 020gzh/linux
int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
				 const struct rockchip_crtc_funcs *crtc_funcs)
{
	int pipe = drm_crtc_index(crtc);
	struct rockchip_drm_private *priv = crtc->dev->dev_private;

	if (pipe > ROCKCHIP_MAX_CRTC)
		return -EINVAL;

	priv->crtc_funcs[pipe] = crtc_funcs;

	return 0;
}
コード例 #7
0
ファイル: fsl_dcu_drm_crtc.c プロジェクト: AshishNamdev/linux
static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
	struct drm_connector *con = &fsl_dev->connector.base;
	struct drm_display_mode *mode = &crtc->state->mode;
	unsigned int hbp, hfp, hsw, vbp, vfp, vsw, index, pol = 0;

	index = drm_crtc_index(crtc);
	clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);

	/* Configure timings: */
	hbp = mode->htotal - mode->hsync_end;
	hfp = mode->hsync_start - mode->hdisplay;
	hsw = mode->hsync_end - mode->hsync_start;
	vbp = mode->vtotal - mode->vsync_end;
	vfp = mode->vsync_start - mode->vdisplay;
	vsw = mode->vsync_end - mode->vsync_start;

	/* INV_PXCK as default (most display sample data on rising edge) */
	if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
		pol |= DCU_SYN_POL_INV_PXCK;

	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
		pol |= DCU_SYN_POL_INV_HS_LOW;

	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		pol |= DCU_SYN_POL_INV_VS_LOW;

	regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
		     DCU_HSYN_PARA_BP(hbp) |
		     DCU_HSYN_PARA_PW(hsw) |
		     DCU_HSYN_PARA_FP(hfp));
	regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
		     DCU_VSYN_PARA_BP(vbp) |
		     DCU_VSYN_PARA_PW(vsw) |
		     DCU_VSYN_PARA_FP(vfp));
	regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
		     DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
		     DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
	regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
	regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
		     DCU_BGND_G(0) | DCU_BGND_B(0));
	regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
		     DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
	regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
		     DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
		     DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
		     DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
	return;
}
コード例 #8
0
ファイル: arcpgu_crtc.c プロジェクト: 513855417/linux
static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
				      struct drm_crtc_state *state)
{
	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
	unsigned long flags;

	if (crtc->state->event) {
		struct drm_pending_vblank_event *event = crtc->state->event;

		crtc->state->event = NULL;
		event->pipe = drm_crtc_index(crtc);

		WARN_ON(drm_crtc_vblank_get(crtc) != 0);

		spin_lock_irqsave(&crtc->dev->event_lock, flags);
		list_add_tail(&event->base.link, &arcpgu->event_list);
		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
	}
}
コード例 #9
0
ファイル: intel_dpll_mgr.c プロジェクト: BOB-TBS/linux_media
/**
 * intel_enable_shared_dpll - enable PCH PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 *
 * The PCH PLL needs to be enabled before the PCH transcoder, since it
 * drives the transcoder clock.
 */
void intel_enable_shared_dpll(struct intel_crtc *crtc)
{
	struct drm_device *dev = crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_shared_dpll *pll = crtc->config->shared_dpll;
	unsigned crtc_mask = 1 << drm_crtc_index(&crtc->base);
	unsigned old_mask;

	if (WARN_ON(pll == NULL))
		return;

	mutex_lock(&dev_priv->dpll_lock);
	old_mask = pll->active_mask;

	if (WARN_ON(!(pll->config.crtc_mask & crtc_mask)) ||
	    WARN_ON(pll->active_mask & crtc_mask))
		goto out;

	pll->active_mask |= crtc_mask;

	DRM_DEBUG_KMS("enable %s (active %x, on? %d) for crtc %d\n",
		      pll->name, pll->active_mask, pll->on,
		      crtc->base.base.id);

	if (old_mask) {
		WARN_ON(!pll->on);
		assert_shared_dpll_enabled(dev_priv, pll);
		goto out;
	}
	WARN_ON(pll->on);

	DRM_DEBUG_KMS("enabling %s\n", pll->name);
	pll->funcs.enable(dev_priv, pll);
	pll->on = true;

out:
	mutex_unlock(&dev_priv->dpll_lock);
}
コード例 #10
0
ファイル: intel_dpll_mgr.c プロジェクト: BOB-TBS/linux_media
void intel_disable_shared_dpll(struct intel_crtc *crtc)
{
	struct drm_device *dev = crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_shared_dpll *pll = crtc->config->shared_dpll;
	unsigned crtc_mask = 1 << drm_crtc_index(&crtc->base);

	/* PCH only available on ILK+ */
	if (INTEL_INFO(dev)->gen < 5)
		return;

	if (pll == NULL)
		return;

	mutex_lock(&dev_priv->dpll_lock);
	if (WARN_ON(!(pll->active_mask & crtc_mask)))
		goto out;

	DRM_DEBUG_KMS("disable %s (active %x, on? %d) for crtc %d\n",
		      pll->name, pll->active_mask, pll->on,
		      crtc->base.base.id);

	assert_shared_dpll_enabled(dev_priv, pll);
	WARN_ON(!pll->on);

	pll->active_mask &= ~crtc_mask;
	if (pll->active_mask)
		goto out;

	DRM_DEBUG_KMS("disabling %s\n", pll->name);
	pll->funcs.disable(dev_priv, pll);
	pll->on = false;

out:
	mutex_unlock(&dev_priv->dpll_lock);
}
コード例 #11
0
ファイル: rcar_lvds.c プロジェクト: lumag/linux
static void rcar_lvds_enable(struct drm_bridge *bridge)
{
	struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
	const struct drm_display_mode *mode = &lvds->display_mode;
	/*
	 * FIXME: We should really retrieve the CRTC through the state, but how
	 * do we get a state pointer?
	 */
	struct drm_crtc *crtc = lvds->bridge.encoder->crtc;
	u32 lvdpllcr;
	u32 lvdhcr;
	u32 lvdcr0;
	int ret;

	WARN_ON(lvds->enabled);

	ret = clk_prepare_enable(lvds->clock);
	if (ret < 0)
		return;

	/*
	 * Hardcode the channels and control signals routing for now.
	 *
	 * HSYNC -> CTRL0
	 * VSYNC -> CTRL1
	 * DISP  -> CTRL2
	 * 0     -> CTRL3
	 */
	rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO |
			LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC |
			LVDCTRCR_CTR0SEL_HSYNC);

	if (lvds->info->quirks & RCAR_LVDS_QUIRK_LANES)
		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3)
		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1);
	else
		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1)
		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3);

	rcar_lvds_write(lvds, LVDCHCR, lvdhcr);

	/* PLL clock configuration. */
	if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN2_PLLCR)
		lvdpllcr = rcar_lvds_lvdpllcr_gen2(mode->clock);
	else
		lvdpllcr = rcar_lvds_lvdpllcr_gen3(mode->clock);
	rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);

	/* Set the LVDS mode and select the input. */
	lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT;
	if (drm_crtc_index(crtc) == 2)
		lvdcr0 |= LVDCR0_DUSEL;
	rcar_lvds_write(lvds, LVDCR0, lvdcr0);

	/* Turn all the channels on. */
	rcar_lvds_write(lvds, LVDCR1,
			LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
			LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);

	if (lvds->info->gen < 3) {
		/* Enable LVDS operation and turn the bias circuitry on. */
		lvdcr0 |= LVDCR0_BEN | LVDCR0_LVEN;
		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
	}

	/* Turn the PLL on. */
	lvdcr0 |= LVDCR0_PLLON;
	rcar_lvds_write(lvds, LVDCR0, lvdcr0);

	if (lvds->info->gen > 2) {
		/* Set LVDS normal mode. */
		lvdcr0 |= LVDCR0_PWD;
		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
	}

	if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN3_LVEN) {
		/* Turn on the LVDS PHY. */
		lvdcr0 |= LVDCR0_LVEN;
		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
	}

	/* Wait for the startup delay. */
	usleep_range(100, 150);

	/* Turn the output on. */
	lvdcr0 |= LVDCR0_LVRES;
	rcar_lvds_write(lvds, LVDCR0, lvdcr0);

	if (lvds->panel) {
		drm_panel_prepare(lvds->panel);
		drm_panel_enable(lvds->panel);
	}

	lvds->enabled = true;
}
コード例 #12
0
ファイル: msm_atomic.c プロジェクト: 513855417/linux
/**
 * drm_atomic_helper_commit - commit validated state object
 * @dev: DRM device
 * @state: the driver state object
 * @nonblock: nonblocking commit
 *
 * This function commits a with drm_atomic_helper_check() pre-validated state
 * object. This can still fail when e.g. the framebuffer reservation fails.
 *
 * RETURNS
 * Zero for success or -errno.
 */
int msm_atomic_commit(struct drm_device *dev,
		struct drm_atomic_state *state, bool nonblock)
{
	struct msm_drm_private *priv = dev->dev_private;
	int nplanes = dev->mode_config.num_total_plane;
	int ncrtcs = dev->mode_config.num_crtc;
	struct msm_commit *c;
	int i, ret;

	ret = drm_atomic_helper_prepare_planes(dev, state);
	if (ret)
		return ret;

	c = commit_init(state);
	if (!c) {
		ret = -ENOMEM;
		goto error;
	}

	/*
	 * Figure out what crtcs we have:
	 */
	for (i = 0; i < ncrtcs; i++) {
		struct drm_crtc *crtc = state->crtcs[i];
		if (!crtc)
			continue;
		c->crtc_mask |= (1 << drm_crtc_index(crtc));
	}

	/*
	 * Figure out what fence to wait for:
	 */
	for (i = 0; i < nplanes; i++) {
		struct drm_plane *plane = state->planes[i];
		struct drm_plane_state *new_state = state->plane_states[i];

		if (!plane)
			continue;

		if ((plane->state->fb != new_state->fb) && new_state->fb) {
			struct drm_gem_object *obj = msm_framebuffer_bo(new_state->fb, 0);
			struct msm_gem_object *msm_obj = to_msm_bo(obj);

			new_state->fence = reservation_object_get_excl_rcu(msm_obj->resv);
		}
	}

	/*
	 * Wait for pending updates on any of the same crtc's and then
	 * mark our set of crtc's as busy:
	 */
	ret = start_atomic(dev->dev_private, c->crtc_mask);
	if (ret) {
		kfree(c);
		goto error;
	}

	/*
	 * This is the point of no return - everything below never fails except
	 * when the hw goes bonghits. Which means we can commit the new state on
	 * the software side now.
	 */

	drm_atomic_helper_swap_state(dev, state);

	/*
	 * Everything below can be run asynchronously without the need to grab
	 * any modeset locks at all under one conditions: It must be guaranteed
	 * that the asynchronous work has either been cancelled (if the driver
	 * supports it, which at least requires that the framebuffers get
	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
	 * before the new state gets committed on the software side with
	 * drm_atomic_helper_swap_state().
	 *
	 * This scheme allows new atomic state updates to be prepared and
	 * checked in parallel to the asynchronous completion of the previous
	 * update. Which is important since compositors need to figure out the
	 * composition of the next frame right after having submitted the
	 * current layout.
	 */

	if (nonblock) {
		queue_work(priv->atomic_wq, &c->work);
		return 0;
	}

	complete_commit(c, false);

	return 0;

error:
	drm_atomic_helper_cleanup_planes(dev, state);
	return ret;
}
コード例 #13
0
ファイル: msm_atomic.c プロジェクト: vmayoral/ubuntu-vivid
/**
 * drm_atomic_helper_commit - commit validated state object
 * @dev: DRM device
 * @state: the driver state object
 * @async: asynchronous commit
 *
 * This function commits a with drm_atomic_helper_check() pre-validated state
 * object. This can still fail when e.g. the framebuffer reservation fails. For
 * now this doesn't implement asynchronous commits.
 *
 * RETURNS
 * Zero for success or -errno.
 */
int msm_atomic_commit(struct drm_device *dev,
		struct drm_atomic_state *state, bool async)
{
	int nplanes = dev->mode_config.num_total_plane;
	int ncrtcs = dev->mode_config.num_crtc;
	struct msm_commit *c;
	int i, ret;

	ret = drm_atomic_helper_prepare_planes(dev, state);
	if (ret)
		return ret;

	c = new_commit(state);
	if (!c)
		return -ENOMEM;

	/*
	 * Figure out what crtcs we have:
	 */
	for (i = 0; i < ncrtcs; i++) {
		struct drm_crtc *crtc = state->crtcs[i];
		if (!crtc)
			continue;
		c->crtc_mask |= (1 << drm_crtc_index(crtc));
	}

	/*
	 * Figure out what fence to wait for:
	 */
	for (i = 0; i < nplanes; i++) {
		struct drm_plane *plane = state->planes[i];
		struct drm_plane_state *new_state = state->plane_states[i];

		if (!plane)
			continue;

		if ((plane->state->fb != new_state->fb) && new_state->fb)
			add_fb(c, new_state->fb);
	}

	/*
	 * Wait for pending updates on any of the same crtc's and then
	 * mark our set of crtc's as busy:
	 */
	ret = start_atomic(dev->dev_private, c->crtc_mask);
	if (ret)
		return ret;

	/*
	 * This is the point of no return - everything below never fails except
	 * when the hw goes bonghits. Which means we can commit the new state on
	 * the software side now.
	 */

	drm_atomic_helper_swap_state(dev, state);

	/*
	 * Everything below can be run asynchronously without the need to grab
	 * any modeset locks at all under one conditions: It must be guaranteed
	 * that the asynchronous work has either been cancelled (if the driver
	 * supports it, which at least requires that the framebuffers get
	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
	 * before the new state gets committed on the software side with
	 * drm_atomic_helper_swap_state().
	 *
	 * This scheme allows new atomic state updates to be prepared and
	 * checked in parallel to the asynchronous completion of the previous
	 * update. Which is important since compositors need to figure out the
	 * composition of the next frame right after having submitted the
	 * current layout.
	 */

	if (async) {
		msm_queue_fence_cb(dev, &c->fence_cb, c->fence);
		return 0;
	}

	ret = msm_wait_fence_interruptable(dev, c->fence, NULL);
	if (ret) {
		WARN_ON(ret);  // TODO unswap state back?  or??
		kfree(c);
		return ret;
	}

	complete_commit(c);

	return 0;
}
コード例 #14
0
static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
	struct drm_display_mode *mode = &crtc->state->mode;
	unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index;
	unsigned long dcuclk;
	int ret;

	index = drm_crtc_index(crtc);
	dcuclk = clk_get_rate(fsl_dev->clk);
	div = dcuclk / mode->clock / 1000;

	/* Configure timings: */
	hbp = mode->htotal - mode->hsync_end;
	hfp = mode->hsync_start - mode->hdisplay;
	hsw = mode->hsync_end - mode->hsync_start;
	vbp = mode->vtotal - mode->vsync_end;
	vfp = mode->vsync_start - mode->vdisplay;
	vsw = mode->vsync_end - mode->vsync_start;

	ret = regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
			   DCU_HSYN_PARA_BP(hbp) |
			   DCU_HSYN_PARA_PW(hsw) |
			   DCU_HSYN_PARA_FP(hfp));
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
			   DCU_VSYN_PARA_BP(vbp) |
			   DCU_VSYN_PARA_PW(vsw) |
			   DCU_VSYN_PARA_FP(vfp));
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
			   DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
			   DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_DIV_RATIO, div);
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_SYN_POL,
			   DCU_SYN_POL_INV_VS_LOW | DCU_SYN_POL_INV_HS_LOW);
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
			   DCU_BGND_G(0) | DCU_BGND_B(0));
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
			   DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
			   DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
			   DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
			   DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
	if (ret)
		goto set_failed;
	ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
			   DCU_UPDATE_MODE_READREG);
	if (ret)
		goto set_failed;
	return;
set_failed:
	dev_err(dev->dev, "set DCU register failed\n");
}