[PATCH v4 29/64] usb: dwc3: import from kernel v5.5

[Jens Wiklander <jens.wiklander@linaro.org>]

Sync Linux kernel dwc3 changes from v5.4 to v5.5.

The following files are preserved accross the import:
Makefile Kconfig dwc3-meson-g12a.c dwc3-meson-gxl.c dwc3-omap.c
dwc3-uniphier.c dwc3-generic.h dwc3-generic.c dwc3-generic-sti.c
dwc3-layerscape.c ti_usb_phy.c

Skipping unused files:
debugfs.c drd.c dwc3-exynos.c dwc3-haps.c dwc3-imx8mp.c dwc3-keystone.c
dwc3-octeon.c dwc3-of-simple.c dwc3-pci.c dwc3-qcom.c dwc3-qcom-legacy.c
dwc3-rtk.c dwc3-st.c dwc3-xilinx.c host.c trace.c trace.h ulpi.c

Note that this is a raw import and doesn't build.
A fixup commit at the end of the series fixes that.

List of commits: git log --oneline v5.4..v5.5
Commits imported:
ea0d762775e2 usb: dwc3: gadget: Fix request complete check
3c3caae4cd6e usb: dwc3: pci: add ID for the Intel Comet Lake -H variant
2d7b78f59e02 usb: dwc3: ep0: Clear started flag on completion
d3abda5a98a1 usb: dwc3: gadget: Clear started flag for non-IOC
8c7d4b7b3d43 usb: dwc3: gadget: Fix logical condition
c3afa2224345 usb: dwc3: Fix Kconfig indentation
7170d1a4cc4d Merge tag 'usb-for-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next
dcf5a2c390a3 usb: dwc3: create debugfs directory under usb root
16c8373ecf7b Merge 5.4-rc6 into usb-next
726b4fba94be usb: dwc3: of-simple: add a shutdown
038761ce68c2 usb: dwc3: debug: Remove newline printout
9ba3aca8fe82 usb: dwc3: Disable phy suspend after power-on reset
bf7c1d95af67 Merge 5.4-rc3 into usb-next
c2c1c66b5d43 usb: Fix Kconfig indentation

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Alexey Charkov <alchark@flipper.net>
---
 drivers/usb/dwc3/core.c   | 37 +++++++++++++++++++++++++++++++++++++
 drivers/usb/dwc3/debug.h  |  4 ++--
 drivers/usb/dwc3/ep0.c    |  8 ++++++++
 drivers/usb/dwc3/gadget.c | 12 +++++++++++-
 4 files changed, 58 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 97d6ae3c4df2..f561c6c9e8a9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -566,8 +566,11 @@ static int dwc3_core_ulpi_init(struct dwc3 *dwc)
  */
 static int dwc3_phy_setup(struct dwc3 *dwc)
 {
+	unsigned int hw_mode;
 	u32 reg;
 
+	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
+
 	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 
 	/*
@@ -585,6 +588,14 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->revision > DWC3_REVISION_194A)
 		reg |= DWC3_GUSB3PIPECTL_SUSPHY;
 
+	/*
+	 * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after
+	 * power-on reset, and it can be set after core initialization, which is
+	 * after device soft-reset during initialization.
+	 */
+	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
+		reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
+
 	if (dwc->u2ss_inp3_quirk)
 		reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
 
@@ -668,6 +679,14 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->revision > DWC3_REVISION_194A)
 		reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 
+	/*
+	 * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after
+	 * power-on reset, and it can be set after core initialization, which is
+	 * after device soft-reset during initialization.
+	 */
+	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
+		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
+
 	if (dwc->dis_u2_susphy_quirk)
 		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 
@@ -902,9 +921,12 @@ static void dwc3_set_incr_burst_type(struct dwc3 *dwc)
  */
 static int dwc3_core_init(struct dwc3 *dwc)
 {
+	unsigned int		hw_mode;
 	u32			reg;
 	int			ret;
 
+	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
+
 	/*
 	 * Write Linux Version Code to our GUID register so it's easy to figure
 	 * out which kernel version a bug was found.
@@ -940,6 +962,21 @@ static int dwc3_core_init(struct dwc3 *dwc)
 	if (ret)
 		goto err0a;
 
+	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD &&
+	    dwc->revision > DWC3_REVISION_194A) {
+		if (!dwc->dis_u3_susphy_quirk) {
+			reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
+			reg |= DWC3_GUSB3PIPECTL_SUSPHY;
+			dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
+		}
+
+		if (!dwc->dis_u2_susphy_quirk) {
+			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
+			reg |= DWC3_GUSB2PHYCFG_SUSPHY;
+			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
+		}
+	}
+
 	dwc3_core_setup_global_control(dwc);
 	dwc3_core_num_eps(dwc);
 
diff --git a/drivers/usb/dwc3/debug.h b/drivers/usb/dwc3/debug.h
index 9baabed87d61..e56beb9d1e36 100644
--- a/drivers/usb/dwc3/debug.h
+++ b/drivers/usb/dwc3/debug.h
@@ -112,7 +112,7 @@ dwc3_gadget_link_string(enum dwc3_link_state link_state)
 	case DWC3_LINK_STATE_RESUME:
 		return "Resume";
 	default:
-		return "UNKNOWN link state\n";
+		return "UNKNOWN link state";
 	}
 }
 
@@ -141,7 +141,7 @@ dwc3_gadget_hs_link_string(enum dwc3_link_state link_state)
 	case DWC3_LINK_STATE_RESUME:
 		return "Resume";
 	default:
-		return "UNKNOWN link state\n";
+		return "UNKNOWN link state";
 	}
 }
 
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 3996b9c4ff8d..fd1b100d2927 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -1117,6 +1117,9 @@ static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
 void dwc3_ep0_interrupt(struct dwc3 *dwc,
 		const struct dwc3_event_depevt *event)
 {
+	struct dwc3_ep	*dep = dwc->eps[event->endpoint_number];
+	u8		cmd;
+
 	switch (event->endpoint_event) {
 	case DWC3_DEPEVT_XFERCOMPLETE:
 		dwc3_ep0_xfer_complete(dwc, event);
@@ -1129,7 +1132,12 @@ void dwc3_ep0_interrupt(struct dwc3 *dwc,
 	case DWC3_DEPEVT_XFERINPROGRESS:
 	case DWC3_DEPEVT_RXTXFIFOEVT:
 	case DWC3_DEPEVT_STREAMEVT:
+		break;
 	case DWC3_DEPEVT_EPCMDCMPLT:
+		cmd = DEPEVT_PARAMETER_CMD(event->parameters);
+
+		if (cmd == DWC3_DEPCMD_ENDTRANSFER)
+			dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 		break;
 	}
 }
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index a9aba716bf80..154f3f3e8cff 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2467,6 +2467,13 @@ static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
 
 static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
 {
+	/*
+	 * For OUT direction, host may send less than the setup
+	 * length. Return true for all OUT requests.
+	 */
+	if (!req->direction)
+		return true;
+
 	return req->request.actual == req->request.length;
 }
 
@@ -2491,7 +2498,7 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
 
 	req->request.actual = req->request.length - req->remaining;
 
-	if (!dwc3_gadget_ep_request_completed(req) &&
+	if (!dwc3_gadget_ep_request_completed(req) ||
 			req->num_pending_sgs) {
 		__dwc3_gadget_kick_transfer(dep);
 		goto out;
@@ -2719,6 +2726,9 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	WARN_ON_ONCE(ret);
 	dep->resource_index = 0;
 
+	if (!interrupt)
+		dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
+
 	if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A)
 		udelay(100);
 }
-- 
2.43.0