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rockchip: rk3399-puma: implement usb_hub_reset_devices for puma-rk3399

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For some versions of the RK3399-Q7 (at least revisions v1.1 and v1.2
are affected), we need to turn on the power for the port connected to
the on-module USB hub only when the device is probed for the first
time to ensure that the hub does not enter a low-power mode (that
U-Boot's USB stack can't deal with).

Note that this is needed for U-Boot only, as Linux eventually manages
to attach the hub even when it has entered into its low-power state
(when the hub wakes up the next time) after a few seconds.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2017-11-22 17:15:18 +01:00
parent fd1f80aab6
commit 614539d4f7
1 changed files with 69 additions and 1 deletions
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70
board/theobroma-systems/puma_rk3399/puma-rk3399.c
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@ -7,12 +7,13 @@
#include <common.h>
#include <dm.h>
#include <misc.h>
#include <spl.h>
#include <usb.h>
#include <dm/pinctrl.h>
#include <dm/uclass-internal.h>
#include <asm/setup.h>
#include <asm/arch/periph.h>
#include <power/regulator.h>
#include <spl.h>
#include <u-boot/sha256.h>
DECLARE_GLOBAL_DATA_PTR;
@ -158,3 +159,70 @@ void get_board_serial(struct tag_serialnr *serialnr)
serialnr->low = (u32)(serial & 0xffffffff);
}
#endif
/**
* Switch power at an external regulator (for our root hub).
*
* @param ctrl pointer to the xHCI controller
* @param port port number as in the control message (one-based)
* @param enable boolean indicating whether to enable or disable power
* @return returns 0 on success, an error-code on failure
*/
static int board_usb_port_power_set(struct udevice *dev, int port,
bool enable)
{
#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_REGULATOR)
/* We start counting ports at 0, while USB counts from 1. */
int index = port - 1;
const char *regname = NULL;
struct udevice *regulator;
const char *prop = "tsd,usb-port-power";
int ret;
debug("%s: ctrl '%s' port %d enable %s\n", __func__,
dev_read_name(dev), port, enable ? "true" : "false");
ret = dev_read_string_index(dev, prop, index, &regname);
if (ret < 0) {
debug("%s: ctrl '%s' port %d: no entry in '%s'\n",
__func__, dev_read_name(dev), port, prop);
return ret;
}
ret = regulator_get_by_platname(regname, &regulator);
if (ret) {
debug("%s: ctrl '%s' port %d: could not get regulator '%s'\n",
__func__, dev_read_name(dev), port, regname);
return ret;
}
regulator_set_enable(regulator, enable);
return 0;
#else
return -ENOTSUPP;
#endif
}
void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
{
struct udevice *dev = hub->pusb_dev->dev;
struct udevice *ctrl;
/* We are only interested in our root-hubs */
if (usb_hub_is_root_hub(dev) == false)
return;
ctrl = usb_get_bus(dev);
if (!ctrl) {
debug("%s: could not retrieve ctrl for hub\n", __func__);
return;
}
/*
* To work around an incompatibility between the single-threaded
* USB stack in U-Boot and (a strange low-power mode of) the USB
* hub we have on-module, we need to delay powering on the hub
* until the first time the port is probed.
*/
board_usb_port_power_set(ctrl, port, true);
}