1.添加配置

drivers/gpu/drm/drm_edid.c

/* 106 - 3840x2160p@50Hz 64:27 */{ DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 594000, 3840, 4896,4984, 5280, 0, 2160, 2168, 2178, 2250, 0,DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC),.vrefresh = 50, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27, },/* 107 - 3840x2160p@60Hz 64:27 */{ DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 594000, 3840, 4016,4104, 4400, 0, 2160, 2168, 2178, 2250, 0,DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC),.vrefresh = 60, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27, }, //在這里添加新的數(shù)據(jù)/* 108 - 1920x3240@60Hz 16:27 */{ DRM_MODE("1920x3240", DRM_MODE_TYPE_DRIVER, 410000, 1920, 1968,2000, 2160, 0, 3240, 3243, 3253, 3299, 0,DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC),.vrefresh = 60, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27, }, #define DRM_MODE(nm, t, c, hd, hss, hse, ht, hsk, vd, vss, vse, vt, vs, f) \.name = nm, .status = 0, .type = (t), .clock = (c), \.hdisplay = (hd), .hsync_start = (hss), .hsync_end = (hse), \.htotal = (ht), .hskew = (hsk), .vdisplay = (vd), \.vsync_start = (vss), .vsync_end = (vse), .vtotal = (vt), \.vscan = (vs), .flags = (f), \.base.type = DRM_MODE_OBJECT_MODE // DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 后面的參數(shù)依次是： // clock, hdisplay, hsync_start, hsync_end, htotal, skew, // vdisplay, vsync_start, vsync_end, vtotal, vscan, flags

比如需要改的分辨率是：

那么clock = 410000，
hdisplay = 1920
hsync_start = hdisplay + tHFP = 1920 + 48 = 1968
hsync_end = hsync_start + tHsync = 2000
htotal = hsync_end + tHBP = 2160
skew = 0

vdisplay = 3240
vsync_start = vdisplay + tVFP = 3240 + 3 = 3243
vsync_end = vsync_start + tVsync = 3253
vtotal = vsync_end + tVBP = 3299
vscan = 0

{ DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,1344, 1600, 0, 864, 865, 868, 900, 0,DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */// 增加一個(gè)自定義的結(jié)構(gòu)體 static const struct drm_display_mode my_self_modes[] = {/* 108 - 1920x3240@60Hz 16:27 */{ DRM_MODE("1920x3240", DRM_MODE_TYPE_DRIVER, 410000, 1920, 1968,2000, 2160, 0, 3240, 3243, 3253, 3299, 0,DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) }, };struct minimode { //.....//增加自定義的函數(shù) static int add_myself_modes(struct drm_connector *connector) {int i, modes = 0;struct drm_device *dev = connector->dev;for(i=0;i<=ARRAY_SIZE(my_self_modes);i++) {struct drm_display_mode *newmode;newmode = drm_mode_duplicate(dev, &my_self_modes[i]);if(newmode) {drm_mode_probed_add(connector, newmode);modes++;}}return modes; }int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) //....num_modes += add_established_modes(connector, edid);num_modes += add_cea_modes(connector, edid);num_modes += add_alternate_cea_modes(connector, edid);num_modes += add_displayid_detailed_modes(connector, edid);num_modes += add_myself_modes(connector); //增加自定義modeif (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF)num_modes += add_inferred_modes(connector, edid);if (quirks & (EDID_QUIRK_PREFER_LARGE_60 | EDID_QUIRK_PREFER_LARGE_75)) //....static int drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid,struct detailed_timing *timing) {int i, modes = 0;struct drm_display_mode *newmode;struct drm_device *dev = connector->dev;for (i = 0; i < ARRAY_SIZE(drm_dmt_modes); i++) {if ((mode_in_range(drm_dmt_modes + i, edid, timing) &&valid_inferred_mode(connector, drm_dmt_modes + i))|| //增加判斷，保證進(jìn)入這個(gè)分支(strcmp(drm_dmt_modes[i].name, "1920x3240") == 0)) { newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);if (newmode) {drm_mode_probed_add(connector, newmode);modes++;}}}return modes; }

2.drivers/gpu/drm/rockchip/rockchip_drm_vop.c

vop_crtc_mode_valid函數(shù)

static enum drm_mode_status vop_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode,int output_type) //.../** Hdmi or DisplayPort request a Accurate clock.*/if (output_type == DRM_MODE_CONNECTOR_HDMIA ||output_type == DRM_MODE_CONNECTOR_DisplayPort)if ((clock != request_clock) && (strcmp(mode->name, "1920x3240") == 0))return MODE_CLOCK_RANGE;//...

3.drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

static int dw_hdmi_connector_get_modes(struct drm_connector *connector) {struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,connector);struct edid *edid;struct drm_display_mode *mode;//const u8 def_modes[6] = {4, 16, 31, 19, 17, 2};const u8 def_modes[1] = {108};struct drm_display_info *info = &connector->display_info;struct hdr_static_metadata *metedata =&connector->display_info.hdmi.hdr_panel_metadata;int i, ret = 0;if (!hdmi->ddc)return 0;//...

4.虛擬機(jī)內(nèi)編譯

執(zhí)行make_kernel.sh獲取kernel.img和resource.img

5.將兩個(gè)img文件燒入到RK3399開發(fā)板內(nèi)

使用燒錄工具單獨(dú)燒錄kernel和resource就行

6.連接LCD屏，遠(yuǎn)程進(jìn)入RK3399環(huán)境內(nèi)，輸入以下命令

cat /sys/class/drm/card0-HDMI-A-1/mode

看到特定分辨率即表示成功

附錄

HDMI輸出4K時(shí)，修改quant range
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
void *data)
hdmi->hdmi_quant_range = 2;

總結(jié)

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