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soc/tegra: pmc: Enable XUSB partitions on boot 

The Tegra XHCI driver does not currently manage the Tegra XUSB power
partitions and so it these partitions have not been enabled by the
bootloader then the system will crash when probing the XHCI device.

While proper support for managing the power partitions is being
developed to the XHCI driver for Tegra, for now power on all the XUSB
partitions for USB host and super-speed on boot if the XHCI driver is
enabled.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Jon Hunter 2016-06-30 11:56:26 +01:00 committed by Thierry Reding
parent e2d1796053
commit 8df127456f
1 changed files with 12 additions and 0 deletions
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12
drivers/soc/tegra/pmc.c
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@ -837,6 +837,18 @@ static void tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np)
if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
goto power_on_cleanup;
/*
* FIXME: If XHCI is enabled for Tegra, then power-up the XUSB
* host and super-speed partitions. Once the XHCI driver
* manages the partitions itself this code can be removed. Note
* that we don't register these partitions with the genpd core
* to avoid it from powering down the partitions as they appear
* to be unused.
*/
if (IS_ENABLED(CONFIG_USB_XHCI_TEGRA) &&
(id == TEGRA_POWERGATE_XUSBA || id == TEGRA_POWERGATE_XUSBC))
goto power_on_cleanup;
pm_genpd_init(&pg->genpd, NULL, off);
err = of_genpd_add_provider_simple(np, &pg->genpd);