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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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13872ebb91
There is a long-standing bug that OHCI USB host controller does not respond on 1710, because of wrong clock definitions. See e.g. http://marc.info/?l=linux-omap&m=119634441229321&w=2. All register reads return just zeroes: [ 1.896606] ohci ohci: OMAP OHCI [ 1.912597] ohci ohci: new USB bus registered, assigned bus number 1 [ 1.933776] ohci ohci: irq 38, io mem 0xfffba000 [ 2.012573] ohci ohci: init err (00000000 0000) [ 2.030334] ohci ohci: can't start [ 2.046661] ohci ohci: startup error -75 [ 2.063201] ohci ohci: USB bus 1 deregistered After some experiments, it seems that when changing the usb_dc_ck / SOFT_REQ enable bit from USB_REQ_EN_SHIFT to SOFT_USB_OTG_DPLL_REQ_SHIFT (like done also on 7XX), the USB appears to work: [ 2.183959] ohci ohci: OMAP OHCI [ 2.198242] ohci ohci: new USB bus registered, assigned bus number 1 [ 2.215820] ohci ohci: irq 38, io mem 0xfffba000 [ 2.324798] hub 1-0:1.0: USB hub found [ 2.361267] hub 1-0:1.0: 3 ports detected The patch is tested on Nokia 770. Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Paul Walmsley <paul@pwsan.com> |
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