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omap4460 DSI1 VESA standards

zengxing yuan
Intellectual 305 points

Hi,

    We used omap4460 in our design,we want to output 1280x800P60(VESA standards),from DSI1 port,how to configure panel timings?

    We use JR_4AI-1.4-P1_OMAP4460,board-44xx-tablet-panel.c

static struct omap_dss_device tablet_lcd_device = {
 .name                   = "lcd",
 .driver_name            = "tc358765",
 .type                   = OMAP_DISPLAY_TYPE_DSI,
 .data   = &tablet_dsi_panel,
 .phy.dsi                = {
  .clk_lane       = 3,
  .clk_pol        = 0,
  .data1_lane     = 1,
  .data1_pol      = 0,
  .data2_lane     = 2,
  .data2_pol      = 0,
  .data3_lane     = 4,
  .data3_pol      = 0,
  .data4_lane     = 5,
  .data4_pol      = 0,

  .type = OMAP_DSS_DSI_TYPE_VIDEO_MODE,
 },

 .clocks = {
  .dispc = {
    .channel = {
    .lck_div        = 1,
    .pck_div        = 2,
    .lcd_clk_src    = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC,
   },
   .dispc_fclk_src = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC,
  },

  .dsi = {
   .regn           = 38,
   .regm           = 441,
   .regm_dispc     = 6,
   .regm_dsi       = 9,
   .lp_clk_div     = 5,
   .offset_ddr_clk = 0,
   .dsi_fclk_src   = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI,
  },
 },

 .panel = {
  .timings = {
   .x_res  = 1280,
   .y_res  = 800,
   .pixel_clock = 65183,
   .hfp  = 10,
   .hsw  = 20,
   .hbp  = 10,
   .vfp  = 4,
   .vsw  = 4,
   .vbp  = 4,
  },
 },

 .ctrl = {
  .pixel_size = 24,
 },

 .reset_gpio     = 102,
 .channel = OMAP_DSS_CHANNEL_LCD,
 .skip_init = false,

 .platform_enable = NULL,
 .platform_disable = NULL,
};

  

  • 0
    TI__Intellectual 1035 points

    Hi Zengxing

    I really am not sure if this would work for VESA, but I ran some calculations for the clocks.

    This is assuming your panel is similar to the one on the tablet 2, that is:

    • DSI Video Mode
    • 4 data lanes
    • 24 bits per pixel

    Please try this. 

    static struct omap_dss_device tablet_lcd_device = {
     .name                   = "lcd",
     .driver_name            = "tc358765",
     .type                   = OMAP_DISPLAY_TYPE_DSI,
     .data   = &tablet_dsi_panel,
     .phy.dsi                = {
      .clk_lane       = 3,
      .clk_pol        = 0,
      .data1_lane     = 1,
      .data1_pol      = 0,
      .data2_lane     = 2,
      .data2_pol      = 0,
      .data3_lane     = 4,
      .data3_pol      = 0,
      .data4_lane     = 5,
      .data4_pol      = 0,
      .type = OMAP_DSS_DSI_TYPE_VIDEO_MODE,
     },
     .clocks = {
      .dispc = {
        .channel = {
        .lck_div        = 1,
        .pck_div        = 2,
        .lcd_clk_src    = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC,
       },
       .dispc_fclk_src = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC,
      },
      .dsi = {
       .regn           = 27,
       .regm           = 354,
       .regm_dispc     = 6,
       .regm_dsi       = 5,
       .lp_clk_div     = 10,
       .offset_ddr_clk = 0,
       .dsi_fclk_src   = OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI,
      },
     },
     .panel = {
      .timings = {
       .x_res  = 1280,
       .y_res  = 800,
       .pixel_clock = 87911,
       .hfp  = 72,
       .hsw  = 128,
       .hbp  = 200,
       .vfp  = 3,
       .vsw  = 6,
       .vbp  = 22,
      },
     },
     .ctrl = {
      .pixel_size = 24,
     },
     .reset_gpio     = 102,
     .channel = OMAP_DSS_CHANNEL_LCD,
     .skip_init = false,
     .platform_enable = NULL,
     .platform_disable = NULL,
    };