[PATCH] imx-drm: imx-hdmi: fix hdmi hotplug detection initial state

[Fabio Estevam]

On Mon, Jun 9, 2014 at 3:15 PM, Fabio Estevam <festevam at gmail.com> wrote:
>> I wonder if the problem is that HDMI and LVDS are interfering with each
>> other wrt the required pixel clock, and LVDS is winning.  If we have
>> HDMI enabled, many HDMI sinks will only work if we set one of their
>> supported modes (with the dot clock within 1% - though some sinks are
>> more lenient).
>
> Yes, it seems this is the case.

I tested not using pll5 as the parent of LVDS:

--- a/arch/arm/mach-imx/clk-imx6q.c
+++ b/arch/arm/mach-imx/clk-imx6q.c
@@ -439,12 +439,6 @@ static void __init imx6q_clocks_init(struct device_node *cc
        clk_register_clkdev(clk[gpt_ipg_per], "per", "imx-gpt.0");
        clk_register_clkdev(clk[enet_ref], "enet_ref", NULL);

-       if ((imx_get_soc_revision() != IMX_CHIP_REVISION_1_0) ||
-           cpu_is_imx6dl()) {
-               clk_set_parent(clk[ldb_di0_sel], clk[pll5_video_div]);
-               clk_set_parent(clk[ldb_di1_sel], clk[pll5_video_div]);
-       }
-
        clk_set_parent(clk[ipu1_di0_pre_sel], clk[pll5_video_div]);
        clk_set_parent(clk[ipu1_di1_pre_sel], clk[pll5_video_div]);
        clk_set_parent(clk[ipu2_di0_pre_sel], clk[pll5_video_div]);


Then the HDMI detection works fine and I get images on both HDMI and LVDS.

I understand that many LVDS panels need a frequency range that can
only be obtained via PLL5 though.