Commit 45d59d70 authored by Marek Vasut's avatar Marek Vasut

drm: Add new driver for MXSFB controller

Add new driver for the MXSFB controller found in i.MX23/28/6SX .
The MXSFB controller is a simple framebuffer controller with one
parallel LCD output. Unlike the MXSFB fbdev driver that is used
on these systems now, this driver uses the DRM/KMS framework.
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
parent 7b920aae
......@@ -8319,6 +8319,12 @@ T: git git://linuxtv.org/mkrufky/tuners.git
S: Maintained
F: drivers/media/tuners/mxl5007t.*
MXSFB DRM DRIVER
M: Marek Vasut <marex@denx.de>
S: Supported
F: drivers/gpu/drm/mxsfb/
F: Documentation/devicetree/bindings/display/mxsfb-drm.txt
MYRICOM MYRI-10G 10GbE DRIVER (MYRI10GE)
M: Hyong-Youb Kim <hykim@myri.com>
L: netdev@vger.kernel.org
......
......@@ -240,6 +240,8 @@ source "drivers/gpu/drm/mediatek/Kconfig"
source "drivers/gpu/drm/zte/Kconfig"
source "drivers/gpu/drm/mxsfb/Kconfig"
# Keep legacy drivers last
menuconfig DRM_LEGACY
......
......@@ -89,3 +89,4 @@ obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
obj-$(CONFIG_DRM_ARCPGU)+= arc/
obj-y += hisilicon/
obj-$(CONFIG_DRM_ZTE) += zte/
obj-$(CONFIG_DRM_MXSFB) += mxsfb/
config DRM_MXS
bool
help
Choose this option to select drivers for MXS FB devices
config DRM_MXSFB
tristate "i.MX23/i.MX28/i.MX6SX MXSFB LCD controller"
depends on DRM && OF
depends on COMMON_CLK
select DRM_MXS
select DRM_KMS_HELPER
select DRM_KMS_FB_HELPER
select DRM_KMS_CMA_HELPER
help
Choose this option if you have an i.MX23/i.MX28/i.MX6SX MXSFB
LCD controller.
If M is selected the module will be called mxsfb.
mxsfb-y := mxsfb_drv.o mxsfb_crtc.o mxsfb_out.o
obj-$(CONFIG_DRM_MXSFB) += mxsfb.o
/*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* This code is based on drivers/video/fbdev/mxsfb.c :
* Copyright (C) 2010 Juergen Beisert, Pengutronix
* Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <linux/clk.h>
#include <linux/iopoll.h>
#include <linux/of_graph.h>
#include <linux/platform_data/simplefb.h>
#include <video/videomode.h>
#include "mxsfb_drv.h"
#include "mxsfb_regs.h"
static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val)
{
return (val & mxsfb->devdata->hs_wdth_mask) <<
mxsfb->devdata->hs_wdth_shift;
}
/* Setup the MXSFB registers for decoding the pixels out of the framebuffer */
static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)
{
struct drm_crtc *crtc = &mxsfb->pipe.crtc;
struct drm_device *drm = crtc->dev;
const u32 format = crtc->primary->state->fb->pixel_format;
u32 ctrl, ctrl1;
ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER;
/*
* WARNING: The bus width, CTRL_SET_BUS_WIDTH(), is configured to
* match the selected mode here. This differs from the original
* MXSFB driver, which had the option to configure the bus width
* to arbitrary value. This limitation should not pose an issue.
*/
/* CTRL1 contains IRQ config and status bits, preserve those. */
ctrl1 = readl(mxsfb->base + LCDC_CTRL1);
ctrl1 &= CTRL1_CUR_FRAME_DONE_IRQ_EN | CTRL1_CUR_FRAME_DONE_IRQ;
switch (format) {
case DRM_FORMAT_RGB565:
dev_dbg(drm->dev, "Setting up RGB565 mode\n");
ctrl |= CTRL_SET_BUS_WIDTH(STMLCDIF_16BIT);
ctrl |= CTRL_SET_WORD_LENGTH(0);
ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0xf);
break;
case DRM_FORMAT_XRGB8888:
dev_dbg(drm->dev, "Setting up XRGB8888 mode\n");
ctrl |= CTRL_SET_BUS_WIDTH(STMLCDIF_24BIT);
ctrl |= CTRL_SET_WORD_LENGTH(3);
/* Do not use packed pixels = one pixel per word instead. */
ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7);
break;
default:
dev_err(drm->dev, "Unhandled pixel format %08x\n", format);
return -EINVAL;
}
writel(ctrl1, mxsfb->base + LCDC_CTRL1);
writel(ctrl, mxsfb->base + LCDC_CTRL);
return 0;
}
static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb)
{
u32 reg;
if (mxsfb->clk_disp_axi)
clk_prepare_enable(mxsfb->clk_disp_axi);
clk_prepare_enable(mxsfb->clk);
mxsfb_enable_axi_clk(mxsfb);
/* If it was disabled, re-enable the mode again */
writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_SET);
/* Enable the SYNC signals first, then the DMA engine */
reg = readl(mxsfb->base + LCDC_VDCTRL4);
reg |= VDCTRL4_SYNC_SIGNALS_ON;
writel(reg, mxsfb->base + LCDC_VDCTRL4);
writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_SET);
}
static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb)
{
u32 reg;
/*
* Even if we disable the controller here, it will still continue
* until its FIFOs are running out of data
*/
writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_CLR);
readl_poll_timeout(mxsfb->base + LCDC_CTRL, reg, !(reg & CTRL_RUN),
0, 1000);
reg = readl(mxsfb->base + LCDC_VDCTRL4);
reg &= ~VDCTRL4_SYNC_SIGNALS_ON;
writel(reg, mxsfb->base + LCDC_VDCTRL4);
mxsfb_disable_axi_clk(mxsfb);
clk_disable_unprepare(mxsfb->clk);
if (mxsfb->clk_disp_axi)
clk_disable_unprepare(mxsfb->clk_disp_axi);
}
static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
{
struct drm_display_mode *m = &mxsfb->pipe.crtc.state->adjusted_mode;
const u32 bus_flags = mxsfb->connector.display_info.bus_flags;
u32 vdctrl0, vsync_pulse_len, hsync_pulse_len;
int err;
/*
* It seems, you can't re-program the controller if it is still
* running. This may lead to shifted pictures (FIFO issue?), so
* first stop the controller and drain its FIFOs.
*/
mxsfb_enable_axi_clk(mxsfb);
/* Clear the FIFOs */
writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET);
err = mxsfb_set_pixel_fmt(mxsfb);
if (err)
return;
clk_set_rate(mxsfb->clk, m->crtc_clock * 1000);
writel(TRANSFER_COUNT_SET_VCOUNT(m->crtc_vdisplay) |
TRANSFER_COUNT_SET_HCOUNT(m->crtc_hdisplay),
mxsfb->base + mxsfb->devdata->transfer_count);
vsync_pulse_len = m->crtc_vsync_end - m->crtc_vsync_start;
vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* Always in DOTCLOCK mode */
VDCTRL0_VSYNC_PERIOD_UNIT |
VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
VDCTRL0_SET_VSYNC_PULSE_WIDTH(vsync_pulse_len);
if (m->flags & DRM_MODE_FLAG_PHSYNC)
vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
if (m->flags & DRM_MODE_FLAG_PVSYNC)
vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
writel(vdctrl0, mxsfb->base + LCDC_VDCTRL0);
/* Frame length in lines. */
writel(m->crtc_vtotal, mxsfb->base + LCDC_VDCTRL1);
/* Line length in units of clocks or pixels. */
hsync_pulse_len = m->crtc_hsync_end - m->crtc_hsync_start;
writel(set_hsync_pulse_width(mxsfb, hsync_pulse_len) |
VDCTRL2_SET_HSYNC_PERIOD(m->crtc_htotal),
mxsfb->base + LCDC_VDCTRL2);
writel(SET_HOR_WAIT_CNT(m->crtc_hblank_end - m->crtc_hsync_end) |
SET_VERT_WAIT_CNT(m->crtc_vblank_end - m->crtc_vsync_end),
mxsfb->base + LCDC_VDCTRL3);
writel(SET_DOTCLK_H_VALID_DATA_CNT(m->hdisplay),
mxsfb->base + LCDC_VDCTRL4);
mxsfb_disable_axi_clk(mxsfb);
}
void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb)
{
mxsfb_crtc_mode_set_nofb(mxsfb);
mxsfb_enable_controller(mxsfb);
}
void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb)
{
mxsfb_disable_controller(mxsfb);
}
void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
struct drm_plane_state *state)
{
struct drm_simple_display_pipe *pipe = &mxsfb->pipe;
struct drm_crtc *crtc = &pipe->crtc;
struct drm_framebuffer *fb = pipe->plane.state->fb;
struct drm_pending_vblank_event *event;
struct drm_gem_cma_object *gem;
if (!crtc)
return;
spin_lock_irq(&crtc->dev->event_lock);
event = crtc->state->event;
if (event) {
crtc->state->event = NULL;
if (drm_crtc_vblank_get(crtc) == 0) {
drm_crtc_arm_vblank_event(crtc, event);
} else {
drm_crtc_send_vblank_event(crtc, event);
}
}
spin_unlock_irq(&crtc->dev->event_lock);
if (!fb)
return;
gem = drm_fb_cma_get_gem_obj(fb, 0);
mxsfb_enable_axi_clk(mxsfb);
writel(gem->paddr, mxsfb->base + mxsfb->devdata->next_buf);
mxsfb_disable_axi_clk(mxsfb);
}
This diff is collapsed.
/*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* i.MX23/i.MX28/i.MX6SX MXSFB LCD controller driver.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MXSFB_DRV_H__
#define __MXSFB_DRV_H__
struct mxsfb_devdata {
unsigned int transfer_count;
unsigned int cur_buf;
unsigned int next_buf;
unsigned int debug0;
unsigned int hs_wdth_mask;
unsigned int hs_wdth_shift;
unsigned int ipversion;
};
struct mxsfb_drm_private {
const struct mxsfb_devdata *devdata;
void __iomem *base; /* registers */
struct clk *clk;
struct clk *clk_axi;
struct clk *clk_disp_axi;
struct drm_simple_display_pipe pipe;
struct drm_connector connector;
struct drm_panel *panel;
struct drm_fbdev_cma *fbdev;
};
int mxsfb_setup_crtc(struct drm_device *dev);
int mxsfb_create_output(struct drm_device *dev);
void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb);
void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb);
void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb);
void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb);
void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,
struct drm_plane_state *state);
#endif /* __MXSFB_DRV_H__ */
/*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/of_graph.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_panel.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drmP.h>
#include "mxsfb_drv.h"
static struct mxsfb_drm_private *
drm_connector_to_mxsfb_drm_private(struct drm_connector *connector)
{
return container_of(connector, struct mxsfb_drm_private, connector);
}
static int mxsfb_panel_get_modes(struct drm_connector *connector)
{
struct mxsfb_drm_private *mxsfb =
drm_connector_to_mxsfb_drm_private(connector);
if (mxsfb->panel)
return mxsfb->panel->funcs->get_modes(mxsfb->panel);
return 0;
}
static const struct
drm_connector_helper_funcs mxsfb_panel_connector_helper_funcs = {
.get_modes = mxsfb_panel_get_modes,
};
static enum drm_connector_status
mxsfb_panel_connector_detect(struct drm_connector *connector, bool force)
{
struct mxsfb_drm_private *mxsfb =
drm_connector_to_mxsfb_drm_private(connector);
if (mxsfb->panel)
return connector_status_connected;
return connector_status_disconnected;
}
static void mxsfb_panel_connector_destroy(struct drm_connector *connector)
{
struct mxsfb_drm_private *mxsfb =
drm_connector_to_mxsfb_drm_private(connector);
if (mxsfb->panel)
drm_panel_detach(mxsfb->panel);
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = mxsfb_panel_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = mxsfb_panel_connector_destroy,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int mxsfb_attach_endpoint(struct drm_device *drm,
const struct of_endpoint *ep)
{
struct mxsfb_drm_private *mxsfb = drm->dev_private;
struct device_node *np;
struct drm_panel *panel;
int ret = -EPROBE_DEFER;
np = of_graph_get_remote_port_parent(ep->local_node);
panel = of_drm_find_panel(np);
of_node_put(np);
if (!panel)
return -EPROBE_DEFER;
mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
mxsfb->connector.polled = 0;
drm_connector_helper_add(&mxsfb->connector,
&mxsfb_panel_connector_helper_funcs);
ret = drm_connector_init(drm, &mxsfb->connector,
&mxsfb_panel_connector_funcs,
DRM_MODE_CONNECTOR_Unknown);
if (!ret)
mxsfb->panel = panel;
return ret;
}
int mxsfb_create_output(struct drm_device *drm)
{
struct device_node *ep_np = NULL;
struct of_endpoint ep;
int ret;
for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
ret = of_graph_parse_endpoint(ep_np, &ep);
if (!ret)
ret = mxsfb_attach_endpoint(drm, &ep);
if (ret) {
of_node_put(ep_np);
return ret;
}
}
return 0;
}
/*
* Copyright (C) 2010 Juergen Beisert, Pengutronix
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* i.MX23/i.MX28/i.MX6SX MXSFB LCD controller driver.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MXSFB_REGS_H__
#define __MXSFB_REGS_H__
#define REG_SET 4
#define REG_CLR 8
#define LCDC_CTRL 0x00
#define LCDC_CTRL1 0x10
#define LCDC_V3_TRANSFER_COUNT 0x20
#define LCDC_V4_TRANSFER_COUNT 0x30
#define LCDC_V4_CUR_BUF 0x40
#define LCDC_V4_NEXT_BUF 0x50
#define LCDC_V3_CUR_BUF 0x30
#define LCDC_V3_NEXT_BUF 0x40
#define LCDC_VDCTRL0 0x70
#define LCDC_VDCTRL1 0x80
#define LCDC_VDCTRL2 0x90
#define LCDC_VDCTRL3 0xa0
#define LCDC_VDCTRL4 0xb0
#define LCDC_V4_DEBUG0 0x1d0
#define LCDC_V3_DEBUG0 0x1f0
#define CTRL_SFTRST (1 << 31)
#define CTRL_CLKGATE (1 << 30)
#define CTRL_BYPASS_COUNT (1 << 19)
#define CTRL_VSYNC_MODE (1 << 18)
#define CTRL_DOTCLK_MODE (1 << 17)
#define CTRL_DATA_SELECT (1 << 16)
#define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
#define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
#define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
#define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
#define CTRL_MASTER (1 << 5)
#define CTRL_DF16 (1 << 3)
#define CTRL_DF18 (1 << 2)
#define CTRL_DF24 (1 << 1)
#define CTRL_RUN (1 << 0)
#define CTRL1_FIFO_CLEAR (1 << 21)
#define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
#define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
#define CTRL1_CUR_FRAME_DONE_IRQ_EN (1 << 13)
#define CTRL1_CUR_FRAME_DONE_IRQ (1 << 9)
#define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
#define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
#define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
#define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
#define VDCTRL0_ENABLE_PRESENT (1 << 28)
#define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
#define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
#define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25)
#define VDCTRL0_ENABLE_ACT_HIGH (1 << 24)
#define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
#define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
#define VDCTRL0_HALF_LINE (1 << 19)
#define VDCTRL0_HALF_LINE_MODE (1 << 18)
#define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
#define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
#define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
#define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
#define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
#define VDCTRL3_VSYNC_ONLY (1 << 28)
#define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
#define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
#define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
#define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
#define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */
#define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */
#define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
#define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
#define DEBUG0_HSYNC (1 < 26)
#define DEBUG0_VSYNC (1 < 25)
#define MXSFB_MIN_XRES 120
#define MXSFB_MIN_YRES 120
#define MXSFB_MAX_XRES 0xffff
#define MXSFB_MAX_YRES 0xffff
#define RED 0
#define GREEN 1
#define BLUE 2
#define TRANSP 3
#define STMLCDIF_8BIT 1 /* pixel data bus to the display is of 8 bit width */
#define STMLCDIF_16BIT 0 /* pixel data bus to the display is of 16 bit width */
#define STMLCDIF_18BIT 2 /* pixel data bus to the display is of 18 bit width */
#define STMLCDIF_24BIT 3 /* pixel data bus to the display is of 24 bit width */
#define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6)
#define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negative edge sampling */
#endif /* __MXSFB_REGS_H__ */
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