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linux_dsm_epyc7002/drivers/gpu/drm/meson/meson_overlay.c
Neil Armstrong 11c2d4c751 drm/meson: Add G12A Support for the Overlay video plane 
Amlogic G12A SoC supports the same set of Video Planes, but now
are handled by the new OSD plane blender module.

This patch uses the same VD1 plane for G12A, using the exact same scaler
and VD1 setup registers, except using the new blender register to
disable the plane.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
[narmstrong: fix typo in commit log]
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190325141824.21259-7-narmstrong@baylibre.com
2019-04-09 11:25:42 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/bitfield.h>
#include <linux/platform_device.h>
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_rect.h>
#include "meson_overlay.h"
#include "meson_vpp.h"
#include "meson_viu.h"
#include "meson_registers.h"
/* VD1_IF0_GEN_REG */
#define VD_URGENT_CHROMA BIT(28)
#define VD_URGENT_LUMA BIT(27)
#define VD_HOLD_LINES(lines) FIELD_PREP(GENMASK(24, 19), lines)
#define VD_DEMUX_MODE_RGB BIT(16)
#define VD_BYTES_PER_PIXEL(val) FIELD_PREP(GENMASK(15, 14), val)
#define VD_CHRO_RPT_LASTL_CTRL BIT(6)
#define VD_LITTLE_ENDIAN BIT(4)
#define VD_SEPARATE_EN BIT(1)
#define VD_ENABLE BIT(0)
/* VD1_IF0_CANVAS0 */
#define CANVAS_ADDR2(addr) FIELD_PREP(GENMASK(23, 16), addr)
#define CANVAS_ADDR1(addr) FIELD_PREP(GENMASK(15, 8), addr)
#define CANVAS_ADDR0(addr) FIELD_PREP(GENMASK(7, 0), addr)
/* VD1_IF0_LUMA_X0 VD1_IF0_CHROMA_X0 */
#define VD_X_START(value) FIELD_PREP(GENMASK(14, 0), value)
#define VD_X_END(value) FIELD_PREP(GENMASK(30, 16), value)
/* VD1_IF0_LUMA_Y0 VD1_IF0_CHROMA_Y0 */
#define VD_Y_START(value) FIELD_PREP(GENMASK(12, 0), value)
#define VD_Y_END(value) FIELD_PREP(GENMASK(28, 16), value)
/* VD1_IF0_GEN_REG2 */
#define VD_COLOR_MAP(value) FIELD_PREP(GENMASK(1, 0), value)
/* VIU_VD1_FMT_CTRL */
#define VD_HORZ_Y_C_RATIO(value) FIELD_PREP(GENMASK(22, 21), value)
#define VD_HORZ_FMT_EN BIT(20)
#define VD_VERT_RPT_LINE0 BIT(16)
#define VD_VERT_INITIAL_PHASE(value) FIELD_PREP(GENMASK(11, 8), value)
#define VD_VERT_PHASE_STEP(value) FIELD_PREP(GENMASK(7, 1), value)
#define VD_VERT_FMT_EN BIT(0)
/* VPP_POSTBLEND_VD1_H_START_END */
#define VD_H_END(value) FIELD_PREP(GENMASK(11, 0), value)
#define VD_H_START(value) FIELD_PREP(GENMASK(27, 16), value)
/* VPP_POSTBLEND_VD1_V_START_END */
#define VD_V_END(value) FIELD_PREP(GENMASK(11, 0), value)
#define VD_V_START(value) FIELD_PREP(GENMASK(27, 16), value)
/* VPP_BLEND_VD2_V_START_END */
#define VD2_V_END(value) FIELD_PREP(GENMASK(11, 0), value)
#define VD2_V_START(value) FIELD_PREP(GENMASK(27, 16), value)
/* VIU_VD1_FMT_W */
#define VD_V_WIDTH(value) FIELD_PREP(GENMASK(11, 0), value)
#define VD_H_WIDTH(value) FIELD_PREP(GENMASK(27, 16), value)
/* VPP_HSC_REGION12_STARTP VPP_HSC_REGION34_STARTP */
#define VD_REGION24_START(value) FIELD_PREP(GENMASK(11, 0), value)
#define VD_REGION13_END(value) FIELD_PREP(GENMASK(27, 16), value)
struct meson_overlay {
struct drm_plane base;
struct meson_drm *priv;
};
#define to_meson_overlay(x) container_of(x, struct meson_overlay, base)
#define FRAC_16_16(mult, div) (((mult) << 16) / (div))
static int meson_overlay_atomic_check(struct drm_plane *plane,
struct drm_plane_state *state)
{
struct drm_crtc_state *crtc_state;
if (!state->crtc)
return 0;
crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
return drm_atomic_helper_check_plane_state(state, crtc_state,
FRAC_16_16(1, 5),
FRAC_16_16(5, 1),
true, true);
}
/* Takes a fixed 16.16 number and converts it to integer. */
static inline int64_t fixed16_to_int(int64_t value)
{
return value >> 16;
}
static const uint8_t skip_tab[6] = {
0x24, 0x04, 0x68, 0x48, 0x28, 0x08,
};
static void meson_overlay_get_vertical_phase(unsigned int ratio_y, int *phase,
int *repeat, bool interlace)
{
int offset_in = 0;
int offset_out = 0;
int repeat_skip = 0;
if (!interlace && ratio_y > (1 << 18))
offset_out = (1 * ratio_y) >> 10;
while ((offset_in + (4 << 8)) <= offset_out) {
repeat_skip++;
offset_in += 4 << 8;
}
*phase = (offset_out - offset_in) >> 2;
if (*phase > 0x100)
repeat_skip++;
*phase = *phase & 0xff;
if (repeat_skip > 5)
repeat_skip = 5;
*repeat = skip_tab[repeat_skip];
}
static void meson_overlay_setup_scaler_params(struct meson_drm *priv,
struct drm_plane *plane,
bool interlace_mode)
{
struct drm_crtc_state *crtc_state = priv->crtc->state;
int video_top, video_left, video_width, video_height;
struct drm_plane_state *state = plane->state;
unsigned int vd_start_lines, vd_end_lines;
unsigned int hd_start_lines, hd_end_lines;
unsigned int crtc_height, crtc_width;
unsigned int vsc_startp, vsc_endp;
unsigned int hsc_startp, hsc_endp;
unsigned int crop_top, crop_left;
int vphase, vphase_repeat_skip;
unsigned int ratio_x, ratio_y;
int temp_height, temp_width;
unsigned int w_in, h_in;
int temp, start, end;
if (!crtc_state) {
DRM_ERROR("Invalid crtc_state\n");
return;
}
crtc_height = crtc_state->mode.vdisplay;
crtc_width = crtc_state->mode.hdisplay;
w_in = fixed16_to_int(state->src_w);
h_in = fixed16_to_int(state->src_h);
crop_top = fixed16_to_int(state->src_x);
crop_left = fixed16_to_int(state->src_x);
video_top = state->crtc_y;
video_left = state->crtc_x;
video_width = state->crtc_w;
video_height = state->crtc_h;
DRM_DEBUG("crtc_width %d crtc_height %d interlace %d\n",
crtc_width, crtc_height, interlace_mode);
DRM_DEBUG("w_in %d h_in %d crop_top %d crop_left %d\n",
w_in, h_in, crop_top, crop_left);
DRM_DEBUG("video top %d left %d width %d height %d\n",
video_top, video_left, video_width, video_height);
ratio_x = (w_in << 18) / video_width;
ratio_y = (h_in << 18) / video_height;
if (ratio_x * video_width < (w_in << 18))
ratio_x++;
DRM_DEBUG("ratio x 0x%x y 0x%x\n", ratio_x, ratio_y);
meson_overlay_get_vertical_phase(ratio_y, &vphase, &vphase_repeat_skip,
interlace_mode);
DRM_DEBUG("vphase 0x%x skip %d\n", vphase, vphase_repeat_skip);
/* Vertical */
start = video_top + video_height / 2 - ((h_in << 17) / ratio_y);
end = (h_in << 18) / ratio_y + start - 1;
if (video_top < 0 && start < 0)
vd_start_lines = (-(start) * ratio_y) >> 18;
else if (start < video_top)
vd_start_lines = ((video_top - start) * ratio_y) >> 18;
else
vd_start_lines = 0;
if (video_top < 0)
temp_height = min_t(unsigned int,
video_top + video_height - 1,
crtc_height - 1);
else
temp_height = min_t(unsigned int,
video_top + video_height - 1,
crtc_height - 1) - video_top + 1;
temp = vd_start_lines + (temp_height * ratio_y >> 18);
vd_end_lines = (temp <= (h_in - 1)) ? temp : (h_in - 1);
vd_start_lines += crop_left;
vd_end_lines += crop_left;
/*
* TOFIX: Input frames are handled and scaled like progressive frames,
* proper handling of interlaced field input frames need to be figured
* out using the proper framebuffer flags set by userspace.
*/
if (interlace_mode) {
start >>= 1;
end >>= 1;
}
vsc_startp = max_t(int, start,
max_t(int, 0, video_top));
vsc_endp = min_t(int, end,
min_t(int, crtc_height - 1,
video_top + video_height - 1));
DRM_DEBUG("vsc startp %d endp %d start_lines %d end_lines %d\n",
vsc_startp, vsc_endp, vd_start_lines, vd_end_lines);
/* Horizontal */
start = video_left + video_width / 2 - ((w_in << 17) / ratio_x);
end = (w_in << 18) / ratio_x + start - 1;
if (video_left < 0 && start < 0)
hd_start_lines = (-(start) * ratio_x) >> 18;
else if (start < video_left)
hd_start_lines = ((video_left - start) * ratio_x) >> 18;
else
hd_start_lines = 0;
if (video_left < 0)
temp_width = min_t(unsigned int,
video_left + video_width - 1,
crtc_width - 1);
else
temp_width = min_t(unsigned int,
video_left + video_width - 1,
crtc_width - 1) - video_left + 1;
temp = hd_start_lines + (temp_width * ratio_x >> 18);
hd_end_lines = (temp <= (w_in - 1)) ? temp : (w_in - 1);
priv->viu.vpp_line_in_length = hd_end_lines - hd_start_lines + 1;
hsc_startp = max_t(int, start, max_t(int, 0, video_left));
hsc_endp = min_t(int, end, min_t(int, crtc_width - 1,
video_left + video_width - 1));
hd_start_lines += crop_top;
hd_end_lines += crop_top;
DRM_DEBUG("hsc startp %d endp %d start_lines %d end_lines %d\n",
hsc_startp, hsc_endp, hd_start_lines, hd_end_lines);
priv->viu.vpp_vsc_start_phase_step = ratio_y << 6;
priv->viu.vpp_vsc_ini_phase = vphase << 8;
priv->viu.vpp_vsc_phase_ctrl = (1 << 13) | (4 << 8) |
vphase_repeat_skip;
priv->viu.vd1_if0_luma_x0 = VD_X_START(hd_start_lines) |
VD_X_END(hd_end_lines);
priv->viu.vd1_if0_chroma_x0 = VD_X_START(hd_start_lines >> 1) |
VD_X_END(hd_end_lines >> 1);
priv->viu.viu_vd1_fmt_w =
VD_H_WIDTH(hd_end_lines - hd_start_lines + 1) |
VD_V_WIDTH(hd_end_lines/2 - hd_start_lines/2 + 1);
priv->viu.vd1_if0_luma_y0 = VD_Y_START(vd_start_lines) |
VD_Y_END(vd_end_lines);
priv->viu.vd1_if0_chroma_y0 = VD_Y_START(vd_start_lines >> 1) |
VD_Y_END(vd_end_lines >> 1);
priv->viu.vpp_pic_in_height = h_in;
priv->viu.vpp_postblend_vd1_h_start_end = VD_H_START(hsc_startp) |
VD_H_END(hsc_endp);
priv->viu.vpp_blend_vd2_h_start_end = VD_H_START(hd_start_lines) |
VD_H_END(hd_end_lines);
priv->viu.vpp_hsc_region12_startp = VD_REGION13_END(0) |
VD_REGION24_START(hsc_startp);
priv->viu.vpp_hsc_region34_startp =
VD_REGION13_END(hsc_startp) |
VD_REGION24_START(hsc_endp - hsc_startp);
priv->viu.vpp_hsc_region4_endp = hsc_endp - hsc_startp;
priv->viu.vpp_hsc_start_phase_step = ratio_x << 6;
priv->viu.vpp_hsc_region1_phase_slope = 0;
priv->viu.vpp_hsc_region3_phase_slope = 0;
priv->viu.vpp_hsc_phase_ctrl = (1 << 21) | (4 << 16);
priv->viu.vpp_line_in_length = hd_end_lines - hd_start_lines + 1;
priv->viu.vpp_preblend_h_size = hd_end_lines - hd_start_lines + 1;
priv->viu.vpp_postblend_vd1_v_start_end = VD_V_START(vsc_startp) |
VD_V_END(vsc_endp);
priv->viu.vpp_blend_vd2_v_start_end =
VD2_V_START((vd_end_lines + 1) >> 1) |
VD2_V_END(vd_end_lines);
priv->viu.vpp_vsc_region12_startp = 0;
priv->viu.vpp_vsc_region34_startp =
VD_REGION13_END(vsc_endp - vsc_startp) |
VD_REGION24_START(vsc_endp - vsc_startp);
priv->viu.vpp_vsc_region4_endp = vsc_endp - vsc_startp;
priv->viu.vpp_vsc_start_phase_step = ratio_y << 6;
}
static void meson_overlay_atomic_update(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct meson_overlay *meson_overlay = to_meson_overlay(plane);
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
struct meson_drm *priv = meson_overlay->priv;
struct drm_gem_cma_object *gem;
unsigned long flags;
bool interlace_mode;
DRM_DEBUG_DRIVER("\n");
interlace_mode = state->crtc->mode.flags & DRM_MODE_FLAG_INTERLACE;
spin_lock_irqsave(&priv->drm->event_lock, flags);
priv->viu.vd1_if0_gen_reg = VD_URGENT_CHROMA |
VD_URGENT_LUMA |
VD_HOLD_LINES(9) |
VD_CHRO_RPT_LASTL_CTRL |
VD_ENABLE;
/* Setup scaler params */
meson_overlay_setup_scaler_params(priv, plane, interlace_mode);
priv->viu.vd1_if0_repeat_loop = 0;
priv->viu.vd1_if0_luma0_rpt_pat = interlace_mode ? 8 : 0;
priv->viu.vd1_if0_chroma0_rpt_pat = interlace_mode ? 8 : 0;
priv->viu.vd1_range_map_y = 0;
priv->viu.vd1_range_map_cb = 0;
priv->viu.vd1_range_map_cr = 0;
/* Default values for RGB888/YUV444 */
priv->viu.vd1_if0_gen_reg2 = 0;
priv->viu.viu_vd1_fmt_ctrl = 0;
switch (fb->format->format) {
/* TOFIX DRM_FORMAT_RGB888 should be supported */
case DRM_FORMAT_YUYV:
priv->viu.vd1_if0_gen_reg |= VD_BYTES_PER_PIXEL(1);
priv->viu.vd1_if0_canvas0 =
CANVAS_ADDR2(priv->canvas_id_vd1_0) |
CANVAS_ADDR1(priv->canvas_id_vd1_0) |
CANVAS_ADDR0(priv->canvas_id_vd1_0);
priv->viu.viu_vd1_fmt_ctrl = VD_HORZ_Y_C_RATIO(1) | /* /2 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(16) | /* /2 */
VD_VERT_FMT_EN;
break;
case DRM_FORMAT_NV12:
case DRM_FORMAT_NV21:
priv->viu.vd1_if0_gen_reg |= VD_SEPARATE_EN;
priv->viu.vd1_if0_canvas0 =
CANVAS_ADDR2(priv->canvas_id_vd1_1) |
CANVAS_ADDR1(priv->canvas_id_vd1_1) |
CANVAS_ADDR0(priv->canvas_id_vd1_0);
if (fb->format->format == DRM_FORMAT_NV12)
priv->viu.vd1_if0_gen_reg2 = VD_COLOR_MAP(1);
else
priv->viu.vd1_if0_gen_reg2 = VD_COLOR_MAP(2);
priv->viu.viu_vd1_fmt_ctrl = VD_HORZ_Y_C_RATIO(1) | /* /2 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(8) | /* /4 */
VD_VERT_FMT_EN;
break;
case DRM_FORMAT_YUV444:
case DRM_FORMAT_YUV422:
case DRM_FORMAT_YUV420:
case DRM_FORMAT_YUV411:
case DRM_FORMAT_YUV410:
priv->viu.vd1_if0_gen_reg |= VD_SEPARATE_EN;
priv->viu.vd1_if0_canvas0 =
CANVAS_ADDR2(priv->canvas_id_vd1_2) |
CANVAS_ADDR1(priv->canvas_id_vd1_1) |
CANVAS_ADDR0(priv->canvas_id_vd1_0);
switch (fb->format->format) {
case DRM_FORMAT_YUV422:
priv->viu.viu_vd1_fmt_ctrl =
VD_HORZ_Y_C_RATIO(1) | /* /2 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(16) | /* /2 */
VD_VERT_FMT_EN;
break;
case DRM_FORMAT_YUV420:
priv->viu.viu_vd1_fmt_ctrl =
VD_HORZ_Y_C_RATIO(1) | /* /2 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(8) | /* /4 */
VD_VERT_FMT_EN;
break;
case DRM_FORMAT_YUV411:
priv->viu.viu_vd1_fmt_ctrl =
VD_HORZ_Y_C_RATIO(2) | /* /4 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(16) | /* /2 */
VD_VERT_FMT_EN;
break;
case DRM_FORMAT_YUV410:
priv->viu.viu_vd1_fmt_ctrl =
VD_HORZ_Y_C_RATIO(2) | /* /4 */
VD_HORZ_FMT_EN |
VD_VERT_RPT_LINE0 |
VD_VERT_INITIAL_PHASE(12) |
VD_VERT_PHASE_STEP(8) | /* /4 */
VD_VERT_FMT_EN;
break;
}
break;
}
/* Update Canvas with buffer address */
priv->viu.vd1_planes = drm_format_num_planes(fb->format->format);
switch (priv->viu.vd1_planes) {
case 3:
gem = drm_fb_cma_get_gem_obj(fb, 2);
priv->viu.vd1_addr2 = gem->paddr + fb->offsets[2];
priv->viu.vd1_stride2 = fb->pitches[2];
priv->viu.vd1_height2 =
drm_format_plane_height(fb->height,
fb->format->format, 2);
DRM_DEBUG("plane 2 addr 0x%x stride %d height %d\n",
priv->viu.vd1_addr2,
priv->viu.vd1_stride2,
priv->viu.vd1_height2);
/* fallthrough */
case 2:
gem = drm_fb_cma_get_gem_obj(fb, 1);
priv->viu.vd1_addr1 = gem->paddr + fb->offsets[1];
priv->viu.vd1_stride1 = fb->pitches[1];
priv->viu.vd1_height1 =
drm_format_plane_height(fb->height,
fb->format->format, 1);
DRM_DEBUG("plane 1 addr 0x%x stride %d height %d\n",
priv->viu.vd1_addr1,
priv->viu.vd1_stride1,
priv->viu.vd1_height1);
/* fallthrough */
case 1:
gem = drm_fb_cma_get_gem_obj(fb, 0);
priv->viu.vd1_addr0 = gem->paddr + fb->offsets[0];
priv->viu.vd1_stride0 = fb->pitches[0];
priv->viu.vd1_height0 =
drm_format_plane_height(fb->height,
fb->format->format, 0);
DRM_DEBUG("plane 0 addr 0x%x stride %d height %d\n",
priv->viu.vd1_addr0,
priv->viu.vd1_stride0,
priv->viu.vd1_height0);
}
priv->viu.vd1_enabled = true;
spin_unlock_irqrestore(&priv->drm->event_lock, flags);
DRM_DEBUG_DRIVER("\n");
}
static void meson_overlay_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct meson_overlay *meson_overlay = to_meson_overlay(plane);
struct meson_drm *priv = meson_overlay->priv;
DRM_DEBUG_DRIVER("\n");
priv->viu.vd1_enabled = false;
/* Disable VD1 */
if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu")) {
writel_relaxed(0, priv->io_base + _REG(VD1_BLEND_SRC_CTRL));
writel_relaxed(0, priv->io_base + _REG(VD2_BLEND_SRC_CTRL));
writel_relaxed(0, priv->io_base + _REG(VD1_IF0_GEN_REG + 0x17b0));
writel_relaxed(0, priv->io_base + _REG(VD2_IF0_GEN_REG + 0x17b0));
} else
writel_bits_relaxed(VPP_VD1_POSTBLEND | VPP_VD1_PREBLEND, 0,
priv->io_base + _REG(VPP_MISC));
}
static const struct drm_plane_helper_funcs meson_overlay_helper_funcs = {
.atomic_check = meson_overlay_atomic_check,
.atomic_disable = meson_overlay_atomic_disable,
.atomic_update = meson_overlay_atomic_update,
.prepare_fb = drm_gem_fb_prepare_fb,
};
static const struct drm_plane_funcs meson_overlay_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
.reset = drm_atomic_helper_plane_reset,
.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};
static const uint32_t supported_drm_formats[] = {
DRM_FORMAT_YUYV,
DRM_FORMAT_NV12,
DRM_FORMAT_NV21,
DRM_FORMAT_YUV444,
DRM_FORMAT_YUV422,
DRM_FORMAT_YUV420,
DRM_FORMAT_YUV411,
DRM_FORMAT_YUV410,
};
int meson_overlay_create(struct meson_drm *priv)
{
struct meson_overlay *meson_overlay;
struct drm_plane *plane;
DRM_DEBUG_DRIVER("\n");
meson_overlay = devm_kzalloc(priv->drm->dev, sizeof(*meson_overlay),
GFP_KERNEL);
if (!meson_overlay)
return -ENOMEM;
meson_overlay->priv = priv;
plane = &meson_overlay->base;
drm_universal_plane_init(priv->drm, plane, 0xFF,
&meson_overlay_funcs,
supported_drm_formats,
ARRAY_SIZE(supported_drm_formats),
NULL,
DRM_PLANE_TYPE_OVERLAY, "meson_overlay_plane");
drm_plane_helper_add(plane, &meson_overlay_helper_funcs);
priv->overlay_plane = plane;
DRM_DEBUG_DRIVER("\n");
return 0;
}
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