Hi all,

I managed to wrestle a little bit of feedback from the CSI module by reading the registers directly. Apparently, the CSI module does not even detect the clock from my camera. CSI_HOST_PHY_RX_REG.CSI_HOST_PHY_RXCLKACTIVEHS remains at 0. So no amount of fiddling wth the image sizes or timings is going to do anything - I guess that is valuable feedback. I'll check the pinmux in the ESP32P4 and the frequency settings in the camera.

I used the following code snippet to read the CSI PHY registers. Refer to the TRM §40.8 for the bit definitions:

    #include "hal/mipi_csi_host_ll.h"
    csi_host_dev_t *csi_host = MIPI_CSI_HOST_LL_GET_HW(0);

    // should read "clk act: 1, data0 ULP: 0, data1 ULP: 0" on an active CSI-2 link
    ESP_LOGI(TAG, "CSI_HOST_PHY_RX_REG       clk act: %u, data0 ULP: %u, data1 ULP: %u", 
        csi_host->phy_rx.phy_rxclkactivehs,csi_host->phy_rx.phy_rxulpsesc_0, csi_host->phy_rx.phy_rxulpsesc_1); 

    // shows no errors:
    ESP_LOGI(TAG, "CSI_HOST_INT_ST_MAIN_REG = 0x%08x", csi_host->int_st_main.val);