[PATCH v3 4/6] usb: ehci: support additional controller quirks

[Linus Walleij <linusw@kernel.org>]

Some EHCI implementations omit CONFIGFLAG and USBMODE, or have an
integrated transaction translator that cannot schedule siTDs.

Add quirks to skip CONFIGFLAG and TDI mode accesses and to reject
full- and low-speed isochronous transfers. Standard controllers retain
their current behavior.

Suggested-by: Daniel Palmer <daniel@thingy.jp>
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
---
 drivers/usb/host/ehci-hcd.c   | 24 ++++++++++++++++--------
 drivers/usb/host/ehci-timer.c |  3 ++-
 drivers/usb/host/ehci.h       |  3 +++
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 19cc7611d86d..75f780ec3ba0 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -187,7 +187,8 @@ static int ehci_halt (struct ehci_hcd *ehci)
 	/* disable any irqs left enabled by previous code */
 	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 
-	if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
+	if (ehci_is_TDI(ehci) && !ehci->no_tdi_mode &&
+	    !tdi_in_host_mode(ehci)) {
 		spin_unlock_irq(&ehci->lock);
 		return 0;
 	}
@@ -254,7 +255,7 @@ int ehci_reset(struct ehci_hcd *ehci)
 	if (retval)
 		return retval;
 
-	if (ehci_is_TDI(ehci))
+	if (ehci_is_TDI(ehci) && !ehci->no_tdi_mode)
 		tdi_reset (ehci);
 
 	if (ehci->debug)
@@ -342,10 +343,12 @@ static void ehci_silence_controller(struct ehci_hcd *ehci)
 	ehci_turn_off_all_ports(ehci);
 
 	/* make BIOS/etc use companion controller during reboot */
-	ehci_writel(ehci, 0, &ehci->regs->configured_flag);
+	if (!ehci->no_configured_flag) {
+		ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 
-	/* unblock posted writes */
-	ehci_readl(ehci, &ehci->regs->configured_flag);
+		/* unblock posted writes */
+		ehci_readl(ehci, &ehci->regs->configured_flag);
+	}
 	spin_unlock_irq(&ehci->lock);
 }
 
@@ -629,7 +632,8 @@ static int ehci_run (struct usb_hcd *hcd)
 	 */
 	down_write(&ehci_cf_port_reset_rwsem);
 	ehci->rh_state = EHCI_RH_RUNNING;
-	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+	if (!ehci->no_configured_flag)
+		ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 
 	/* Wait until HC become operational */
 	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
@@ -909,6 +913,8 @@ static int ehci_urb_enqueue (
 	case PIPE_ISOCHRONOUS:
 		if (urb->dev->speed == USB_SPEED_HIGH)
 			return itd_submit (ehci, urb, mem_flags);
+		else if (ehci->no_fsls_isoc)
+			return -EOPNOTSUPP;
 		else
 			return sitd_submit (ehci, urb, mem_flags);
 	}
@@ -1184,7 +1190,8 @@ int ehci_resume(struct usb_hcd *hcd, bool force_reset)
 	 * then we maintained suspend power.
 	 * Just undo the effect of ehci_suspend().
 	 */
-	if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
+	if ((ehci->no_configured_flag ||
+	     ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) &&
 			!force_reset) {
 		int	mask = INTR_MASK;
 
@@ -1216,7 +1223,8 @@ int ehci_resume(struct usb_hcd *hcd, bool force_reset)
 		goto skip;
 
 	ehci_writel(ehci, ehci->command, &ehci->regs->command);
-	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+	if (!ehci->no_configured_flag)
+		ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
 
 	ehci->rh_state = EHCI_RH_SUSPENDED;
diff --git a/drivers/usb/host/ehci-timer.c b/drivers/usb/host/ehci-timer.c
index a79c8ac0a55f..404069a3dd0b 100644
--- a/drivers/usb/host/ehci-timer.c
+++ b/drivers/usb/host/ehci-timer.c
@@ -199,7 +199,8 @@ static void ehci_handle_controller_death(struct ehci_hcd *ehci)
 
 	/* Clean up the mess */
 	ehci->rh_state = EHCI_RH_HALTED;
-	ehci_writel(ehci, 0, &ehci->regs->configured_flag);
+	if (!ehci->no_configured_flag)
+		ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 	ehci_work(ehci);
 	end_unlink_async(ehci);
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index bce4579fb8b2..855a9d08b019 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -235,6 +235,9 @@ struct ehci_hcd {			/* one per controller */
 	unsigned		spurious_oc:1;
 	unsigned		is_aspeed:1;
 	unsigned		zx_wakeup_clear_needed:1;
+	unsigned		no_configured_flag:1;
+	unsigned		no_tdi_mode:1;
+	unsigned		no_fsls_isoc:1;
 
 	/* required for usb32 quirk */
 	#define OHCI_CTRL_HCFS          (3 << 6)

-- 
2.55.0