Source: u-boot Version: 2019.01+dfsg-7 Severity: normal Tags: patch -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
U-Boot supports the DIY laptop Olimex Teres-I, except the builtin keyboard is not detected. The keyboard firmware pauses for 2 seconds to allow reflashing its firmware, and U-Boot needs to wait equally long to detect it as a HID device. Issuing a "usb reset" works occationally, possibly because that pulls the power triggering a reboot of the keyboard controller. U-Boot offers KConfig setting CONFIG_INITIAL_USB_SCAN_DELAY which apparently fails to work, seemingly because that adds a delay _before_ the USB hub is powered on which (pure guesswork) fails to work if the keyboard draws its power from the USB hub. A working solution is to set environment variable usb_pgood_delay before initially calling "usb start": Seemingly that variable adds a delay _after_ powering up the USB hub but before devices are probed. U-Boot environment variables is set in include/configs/<yourboard>.h or with KConfig settings CONFIG_USE_PREBOOT and CONFIG_PREBOOT. Sunxi devices share a common file include/configs/sunxi_common.h which complicates setting env directly and also messes with preboot setting in ways not overridable with KConfig. The patch setting usb_pgood_delay therefore requires another patch to allow overriding preboot. A working patchset is pushed to git branch wip-teres-i-keyboard: https://salsa.debian.org/debian/u-boot/tree/wip/teres-i-keyboard I have tested the patchset only on the Teres-I device, where keyboard is succesfully detected 5 times in a row power-cycling in-between. I have also tested that the preboot patch applied alone causes no change to preboot config value. This patchset is not in mainline U-Boot, but I intent to propose it. - Jonas -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEn+Ppw2aRpp/1PMaELHwxRsGgASEFAl1ZP+AACgkQLHwxRsGg ASHTYhAAiygm195o4LU4o8hH5gaoQpbeYmYQdudxU5LCbSrkE/ZoHO7DImOwfWX/ e1OPLTIcMVTQA5KcGX/I378uvh5mQzhdmaEHRRne2sggRqTLncQ8uVh6YKHyw974 Hdej57lZsQkjVR214Y/Qjgfidn6Vi8KHHNSBtxej7xaks0ASta2Y/o2+ufZDY7Om YPEgjp3Ve0lwbUobK+wXUw4Sb/EWQADQtof+3ie2ESiKwEKUtHIwvHGByvdEMWH/ 8ST3Wu0roi161OPN46IaGlRuL0xI3LdlRWbq3bZuUH8XEb4rPDJz0TdPs79swct2 z141SgvdRsW+5SlAKBzK4GZbOn3gj1UXKlCXrOHcMLipN1oyPnoTZ5c99sggzUdn L3rXFbBvnUn3zP50WJQzvlKi3Xs3OxOfFtIq9E/I5fmp6PC3/y1YZkBDoW2PJ4Hq 1DCJQIKe5txzGGrloI7oMVeryVfo9Yecv79jLYAcAk9ZqwrXXOdpdUWvrG6vAHgY uELkgiZbeNfz3jDXSrr0Jqa3M4aA7g1fRCc0CpD5+vhNuQZQkAt5Etj2pkos9DMA JqDlEpR5WW9a+knrCwG5Zq/dTGNbZiM7k3LkrsSBqV5tMxZGN16ICG4I5m+2fxVy tZDwWFbMcijuWxXUyDqKBJNBcRLHue2Ns2DtP0r8jq4IDS5bHo8= =pDyY -----END PGP SIGNATURE-----
