From bd23963c8f359d0a3c802f7cd96b51b4d36b01ac Mon Sep 17 00:00:00 2001 From: cinap_lenrek Date: Thu, 2 Jul 2020 21:04:01 +0200 Subject: bcm64: fix usb xhci controller on pi4 8GB variant (thanks richard miller) On the 8GB variant of the raspberry pi 4, the eeprom chip for the xhci controller is missing and instead loaded from sdram (by the gpu firmware). for this, the gpu firmware needs to be notified of the xhci controllers pci bus address (after reset) that was assigned by our pci enumeration code. --- sys/src/9/bcm/vcore.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'sys/src/9/bcm') diff --git a/sys/src/9/bcm/vcore.c b/sys/src/9/bcm/vcore.c index 818c12a35..91cc7dcf9 100644 --- a/sys/src/9/bcm/vcore.c +++ b/sys/src/9/bcm/vcore.c @@ -53,6 +53,7 @@ enum { TagSetEgpioConf = 0x00038043, TagGettemp = 0x00030006, + TagXhciReset = 0x00030058, TagFballoc = 0x00040001, TagFbfree = 0x00048001, TagFbblank = 0x00040002, @@ -413,3 +414,19 @@ egpset(uint port, int on) buf[1] = on; vcreq(TagSetEgpioState, buf, sizeof(buf), sizeof(buf)); } + +/* + * Notify gpu that xhci firmware might need loading. This is for some + * pi4 board versions which are missing the eeprom chip for the vl805, + * requiring its firmware to come from the boot eeprom instead. + */ +int +xhcireset(int devaddr) +{ + u32int buf[1]; + + buf[0] = devaddr; + if(vcreq(TagXhciReset, buf, sizeof(buf), sizeof(buf[0])) == sizeof(buf[0])) + return buf[0]; + return -1; +} -- cgit v1.2.3