[BUG]odroid-c2 does not hotplug usb-devices

[Otto Meier]

Hi Martin,

Am 13.12.20 um 19:46 schrieb Martin Blumenstingl:
> Hi Otto,
>
> On Mon, Dec 7, 2020 at 1:43 PM Otto Meier <gf435 at gmx.net> wrote:
> [...]
>>>> So with the latest u-boot and the kernel from https://github.com/chewitt/linux/tree/amlogic-5.10.y
>>>> commit 725fc8df7898102f9031ba2075f763884ffa3ee8 everything is working again.
>>>> USB does hotplugging as expected.
>>> So, this fixes USB under Linux ?? It's not clear
> if you have time it would be great if you could figure out which of
> the patches from Christian's tree fixes USB hotplugging for you.
> Or is it fixed in Linux 5.10-rcX even without any patches?
>
The new mainline kernel 5.10.0 from Linus, without any other patches 
does detect USB hotpluging,
when using u-boot DMI: Hardkernel Co., Ltd. ODROID-C2/ODROID-C2, BIOS 
2021.01-rc3-00039-gec79f5ce22-dirty 12/08/2020
and the following u-boot patch:

--- u-boot.git/arch/arm/dts/meson-gxbb.dtsi.orig        2020-11-27 
17:20:04.624193561 +0100
+++ u-boot.git/arch/arm/dts/meson-gxbb.dtsi     2020-11-27 
17:23:18.472088934 +0100
@@ -403,36 +403,33 @@
                         gpio-ranges = <&pinctrl_periphs 0 0 119>;
                 };

-               emmc_pins: emmc {
-                       mux-0 {
-                               groups = "emmc_nand_d07",
-                                      "emmc_cmd";
-                               function = "emmc";
-                               bias-pull-up;
-                       };

-                       mux-1 {
-                               groups = "emmc_clk";
-                               function = "emmc";
-                               bias-disable;
-                       };
-               };
+                emmc_pins: emmc {
+                        mux {
+                                groups = "emmc_nand_d07",
+                                       "emmc_cmd",
+                                       "emmc_clk";
+                                function = "emmc";
+                        };
+                };

-               emmc_ds_pins: emmc-ds {
-                       mux {
-                               groups = "emmc_ds";
-                               function = "emmc";
-                               bias-pull-down;
-                       };
-               };
+                emmc_ds_pins: emmc-ds {
+                        mux {
+                                groups = "emmc_ds";
+                                function = "emmc";
+                        };
+                };

-               emmc_clk_gate_pins: emmc_clk_gate {
-                       mux {
-                               groups = "BOOT_8";
-                               function = "gpio_periphs";
-                               bias-pull-down;
-                       };
-               };
+                emmc_clk_gate_pins: emmc_clk_gate {
+                        mux {
+                                groups = "BOOT_8";
+                                function = "gpio_periphs";
+                        };
+                        cfg-pull-down {
+                                pins = "BOOT_8";
+                                bias-pull-down;
+                        };
+                };

                 nor_pins: nor {
                         mux {

When i use the last unpatched emmc bootable u-boot 2020.04 the kernel 
boots, but usb hotplugging
does not work.

Hope this describes my findings. If i can help further, please give me a 
note.

> Best regards,
> Martin
>
Best regards
Otto