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authorJagan Teki <jagan@amarulasolutions.com>2020-05-26 11:33:48 +0800
committerKever Yang <kever.yang@rock-chips.com>2020-05-29 18:13:19 +0800
commitdc18413adbf188ffdfb0706023249e7c03b29545 (patch)
tree93efaf736c6411c2350dac0af8f1fdb992069d42 /drivers/soc/ti
parentb34f8b5de0fea945c2683e9e64d941c121aa02ad (diff)
usb: dwc3: Add disable u2mac linestate check quirk
This patch adds a quirk to disable USB 2.0 MAC linestate check during HS transmit. Refer the dwc3 databook, we can use it for some special platforms if the linestate not reflect the expected line state(J) during transmission. When use this quirk, the controller implements a fixed 40-bit TxEndDelay after the packet is given on UTMI and ignores the linestate during the transmit of a token (during token-to-token and token-to-data IPGAP). On some rockchip platforms (e.g. rk3399), it requires to disable the u2mac linestate check to decrease the SSPLIT token to SETUP token inter-packet delay from 566ns to 466ns, and fix the issue that FS/LS devices not recognized if inserted through USB 3.0 HUB. Reference from below Linux commit, commit <65db7a0c9816> ("usb: dwc3: add disable u2mac linestate check quirk") Cc: Marek Vasut <marex@denx.de> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Diffstat (limited to 'drivers/soc/ti')
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