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authorThierry Reding <treding@nvidia.com>2016-05-26 17:23:29 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-11 09:31:13 -0700
commit89c18f106c0812796f36464934b478005a097f53 (patch)
treeacdf2d4d2d365434fa28aa4fed4bb9e2a8052e7c /drivers/usb/dwc3/debugfs.c
parente845e8b6c517952821f61556c87d36924cfaeb1c (diff)
usb: host: ehci-tegra: Grab the correct UTMI pads reset
commit f8a15a9650694feaa0dabf197b0c94d37cd3fb42 upstream. There are three EHCI controllers on Tegra SoCs, each with its own reset line. However, the first controller contains a set of UTMI configuration registers that are shared with its siblings. These registers will only be reset as part of the first controller's reset. For proper operation it must be ensured that the UTMI configuration registers are reset before any of the EHCI controllers are enabled, irrespective of the probe order. Commit a47cc24cd1e5 ("USB: EHCI: tegra: Fix probe order issue leading to broken USB") introduced code that ensures the first controller is always reset before setting up any of the controllers, and is never again reset afterwards. This code, however, grabs the wrong reset. Each EHCI controller has two reset controls attached: 1) the USB controller reset and 2) the UTMI pads reset (really the first controller's reset). In order to reset the UTMI pads registers the code must grab the second reset, but instead it grabbing the first. Fixes: a47cc24cd1e5 ("USB: EHCI: tegra: Fix probe order issue leading to broken USB") Acked-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/debugfs.c')
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