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>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 83a0782adc..b399c9bea9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -727,6 +727,7 @@ int dwc3_uboot_init(struct dwc3_device *dwc3_dev)
 	dwc->dis_u3_susphy_quirk = dwc3_dev->dis_u3_susphy_quirk;
 	dwc->dis_u2_susphy_quirk = dwc3_dev->dis_u2_susphy_quirk;
 	dwc->dis_del_phy_power_chg_quirk = dwc3_dev->dis_del_phy_power_chg_quirk;
+	dwc->dis_tx_ipgap_linecheck_quirk = dwc3_dev->dis_tx_ipgap_linecheck_quirk;
 	dwc->dis_enblslpm_quirk = dwc3_dev->dis_enblslpm_quirk;
 	dwc->dis_u2_freeclk_exists_quirk = dwc3_dev->dis_u2_freeclk_exists_quirk;
 
@@ -936,6 +937,8 @@ void dwc3_of_parse(struct dwc3 *dwc)
 				"snps,dis_u2_susphy_quirk");
 	dwc->dis_del_phy_power_chg_quirk = dev_read_bool(dev,
 				"snps,dis-del-phy-power-chg-quirk");
+	dwc->dis_tx_ipgap_linecheck_quirk = dev_read_bool(dev,
+				"snps,dis-tx-ipgap-linecheck-quirk");
 	dwc->dis_enblslpm_quirk = dev_read_bool(dev,
 				"snps,dis_enblslpm_quirk");
 	dwc->dis_u2_freeclk_exists_quirk = dev_read_bool(dev,
@@ -956,6 +959,7 @@ void dwc3_of_parse(struct dwc3 *dwc)
 int dwc3_init(struct dwc3 *dwc)
 {
 	int ret;
+	u32 reg;
 
 	dwc3_cache_hwparams(dwc);
 
@@ -977,6 +981,22 @@ int dwc3_init(struct dwc3 *dwc)
 		goto event_fail;
 	}
 
+	if (dwc->revision >= DWC3_REVISION_250A) {
+		reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
+
+		/*
+		 * 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);
+	}
+
 	ret = dwc3_core_init_mode(dwc);
 	if (ret)
 		goto mode_fail;