diff options
| author | William Wu <william.wu@rock-chips.com> | 2017-04-19 20:11:38 +0800 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-05-17 14:16:57 +0300 |
| commit | 65db7a0c9816370da5303500c7ba3754fa430720 (patch) | |
| tree | 7da7f0d3a114bc937d06ab1207f3b6bbb0576ca2 /drivers/usb/dwc3/core.c | |
| parent | 53e720f332d546dee5a98a55f6e532355727bc4d (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.
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3/core.c')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 455d89a1cd6d..9d5a67cc2645 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -796,13 +796,19 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); } - /* - * Enable hardware control of sending remote wakeup in HS when - * the device is in the L1 state. - */ - if (dwc->revision >= DWC3_REVISION_290A) { + if (dwc->revision >= DWC3_REVISION_250A) { reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); - reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW; + + /* + * Enable hardware control of sending remote wakeup + * in HS when the device is in the L1 state. + */ + if (dwc->revision >= DWC3_REVISION_290A) + reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW; + + if (dwc->dis_tx_ipgap_linecheck_quirk) + reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS; + dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); } @@ -1023,6 +1029,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) "snps,dis-u2-freeclk-exists-quirk"); dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev, "snps,dis-del-phy-power-chg-quirk"); + dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, + "snps,dis-tx-ipgap-linecheck-quirk"); dwc->tx_de_emphasis_quirk = device_property_read_bool(dev, "snps,tx_de_emphasis_quirk"); |