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I have observed two separate EHCI host bridges that do not tolerate using C bit-fields to directly manipulate the portsc_t register. The reason for this is that the EHCI spec says that port_enable must go to 0 at the time that port_reset goes to 1. Naturally this cannot be done using direct bit-field manipulation. Instead, we use a temporary variable, change the bit-fields there, then atomically write the new value back to the hardware. Signed-off-by: Steven A. Falco <sfalco@coincident.com> Change-Id: If138faee43e0293efa203b86f7893fdf1e811269 Reviewed-on: http://review.coreboot.org/101 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de> |
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