RK3399 HDMI接部分4K显示器不停重启的问题解决

解决思路：跟据显示器判断，默认设置1080P60(目前最大只支持到1080P60),若较小尺寸，则按edid信息进行I2C配置

nct@nct-admin:/mnt/nctsdc2/RK3399System/RK3399-JD4-Android7.1/kernel/drivers$ git diff .
diff --git a/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/bridge/dw-hdmi.c b/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/bridge/dw-hdmi.c
index 835e78cca6..6f998cf7ea 100644
--- a/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -2442,21 +2442,46 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)

static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
{
+ bool isVertical = false;
+ int min = 0;
+ int max = 0;
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[6] = {4, 16, 31, 19, 17, 2};
+ const u8 def_modes[6] = {16, 4, 31, 19, 17, 2};
struct hdr_static_metadata *metedata =
&connector->display_info.hdmi.hdr_panel_metadata;
int i, ret = 0;

if (!hdmi->ddc)
return 0;
- //@howard 20210604
- //edid = drm_get_edid(connector, hdmi->ddc);
- edid = NULL;
- printk("Howard###hdmi, %s\n", __FUNCTION__);
+
+ printk("Howard###hdmi, %s:\n", __FUNCTION__);
+
+ edid = drm_get_edid(connector, hdmi->ddc);
+
+ /**
+ * added by howard
+ */
+ if(edid) {
+ printk("Howard###hdmi, %s: %dX%d\n", __FUNCTION__, edid->width_cm, edid->height_cm);
+ }
+
+ if(edid->width_cm < edid->height_cm ){
+ isVertical = true;
+ min = edid->width_cm;
+ max = edid->height_cm;
+ }else{
+ max = edid->width_cm;
+ min = edid->height_cm;
+ }
+ //48X27
+ if(min > 27 && max > 48){
+ edid = NULL;
+ }
+
if (edid) {
dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
edid->width_cm, edid->height_cm);
diff --git a/RK3399-JD4-Android7.1/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h b/RK3399-JD4-Android7.1/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
index 08e1f9b47e..06f097f7a2 100644
--- a/RK3399-JD4-Android7.1/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
+++ b/RK3399-JD4-Android7.1/kernel/drivers/video/rockchip/hdmi/rockchip-hdmi.h
@@ -566,8 +566,9 @@ struct hdmi {
#define HDMI_AUTO_CONFIG false

/* HDMI default vide mode */
-#define HDMI_VIDEO_DEFAULT_MODE HDMI_1280X720P_60HZ
- /*HDMI_1920X1080P_60HZ*/
+//#define HDMI_VIDEO_DEFAULT_MODE HDMI_1280X720P_60HZ
+#define HDMI_VIDEO_DEFAULT_MODE HDMI_1920X1080P_60HZ
+
#define HDMI_VIDEO_DEFAULT_COLORMODE HDMI_COLOR_AUTO
#define HDMI_VIDEO_DEFAULT_COLORDEPTH 8

(END)

diff --git a/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index e1f50de45c..7a3cb8fde5 100644
--- a/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/RK3399-JD4-Android7.1/kernel/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -484,11 +484,14 @@ dw_hdmi_rockchip_mode_valid(struct drm_connector *connector,
* If sink max TMDS clock < 340MHz, we should check the mode pixel
* clock > 340MHz is YCbCr420 or not.
*/
+//@howard 20210604 disable
+ printk("Howard###hdmi, %s\n", __FUNCTION__);
+#if 0
if (mode->clock > 340000 &&
connector->display_info.max_tmds_clock < 340000 &&
!drm_mode_is_420(&connector->display_info, mode))
return MODE_BAD;
-
+#endif

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