RK3288 android7.1 edp传输速率修改

kernel\drivers\gpu\drm\bridge\analogix\analogix_dp_core.c
static void analogix_dp_init_training(struct analogix_dp_device *dp,
                      enum link_lane_count_type max_lane,
                      int max_rate)
{
    /*
     * MACRO_RST must be applied after the PLL_LOCK to avoid
     * the DP inter pair skew issue for at least 10 us
     */
    analogix_dp_reset_macro(dp);

    /* Initialize by reading RX's DPCD */
    analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
    analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);

    if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
        (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
        (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
        dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
            dp->link_train.link_rate);
        dp->link_train.link_rate = DP_LINK_BW_1_62;
    }
+ dp->link_train.link_rate = DP_LINK_BW_1_62;
    if (dp->link_train.lane_count == 0) {
        dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",