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authorJulius Werner <jwerner@chromium.org>2016-08-03 19:18:39 -0700
committerMartin Roth <martinroth@google.com>2016-08-11 22:30:21 +0200
commit785ff1b7dbbaa276c4ce9fc1663736e1647886c1 (patch)
tree6a8021f7a4ea842463d5e1c500f52c8ffd9684c3 /src/mainboard/google/nyan
parent1394bba6bb9e8dc48afb4fe6107d8e64ee5e6855 (diff)
rockchip/rk3399: Add code to neuter Type-C PHY for firmware USB
The Rockchip RK3399 integrates a USB Type-C PHY in charge of things like SuperSpeed line muxing for rotated cable orientations in the SoC. While fancy, this is very complicated and we don't want to implement support for the whole thing in firmware. The USB Type-C standard has intentionally been designed in a way that the USB 2.0 (HighSpeed) lines always "just work" in any orientation (by just shorting different pins in the connector together) so that simple use cases like ours can get basic USB functionality without much hassle. However, a semi-configured Type-C PHY can confuse USB 3.0 capable devices into thinking we're actually supporting SuperSpeed, and fail at that rather than establishing a reliable HighSpeed connection. This patch sets enough bits in the Type-C PHY to electrically isolate the SuperSpeed lines from the connector so that the connected device isn't going to get any fancy ideas and reliably falls back to USB 2.0. Also clean up the rest of the USB code while we're at it: avoid writing a few bits that are already in the right state from their reset values anyway, or reading values whose content we already know for this SoC. Rename the USB controllers to the name actually used in the Rockchip documentation (USB OTGx) rather than the name blindly copied from Exynos code (USB DRDx). BRANCH=None BUG=chrome-os-partner:54621 TEST=Plug a USB 3.0 Patriot Memory stick into both ports in all orientations, observe how it gets reliably detected now (safe for some known hardware issues on my board). Change-Id: Ifce6bcddd69f2e8f2e2a2f48faf65551e084da1e Signed-off-by: Martin Roth <martinroth@chromium.org> Original-Commit-Id: c526906f998bf66067d3addb8b3d3a126c188b1e Original-Change-Id: Ie80a201a58764c4d851fe4a5098a5acfc4bcebdf Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/366160 Original-Reviewed-by: liangfeng wu <wulf@rock-chips.com> Original-Reviewed-by: Shelley Chen <shchen@chromium.org> Original-Reviewed-by: <515506667@qq.com> Reviewed-on: https://review.coreboot.org/16125 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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