From: Stephen Warren <swarren@nvidia.com>
Date: Wed, 30 Apr 2014 21:09:55 +0000 (-0600)
Subject: usb: tegra: fix PHY selection code
X-Git-Tag: v2014.07-rc2~10^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9b20fe6f1affdfc7441481dc0acb55eadd80134f;p=platform%2Fkernel%2Fu-boot.git

usb: tegra: fix PHY selection code

The TRM for Tegra30 and later all state that USBMODE_CM_HC must be set
before writing to hostpc1_devlc to select which PHY to use for a USB
controller. However, neither init_{utmi,ulpi}_usb_controller() do this
today, so the register writes they perform for PHY selection do not
work.

For the UTMI case, this was hacked around in commit 7e44d9320ed4 "ARM:
Tegra: USB: EHCI: Add support for Tegra30/Tegra114" by adding code to
ehci_hcd_init() which sets USBMODE_CM_HC and duplicates the PHY
selection register write. This code doesn't cover the ULPI case, so I
wouldn't be surprised if ULPI doesn't work with the current code, unless
the ordering requirement only ends up being an issue in HW for UTMI not
ULPI.

This patch fixes init_{utmi,ulpi}_usb_controller() to correctly set
USBMODE_CM_HC before selecting the PHY. Now that this works, we can
remove the duplicate UTMI-specific code in ehci_hcd_init(), thus
simplifying that function.

Cc: Jim Lin <jilin@nvidia.com>
Cc: Stefan Agner <stefan@agner.ch>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 38db18e..9a9a127 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -496,6 +496,10 @@ static int init_utmi_usb_controller(struct fdt_usb *config)
 		clrbits_le32(&usbctlr->port_sc1, STS);
 	}
 #else
+	/* Set to Host mode after Controller Reset was done */
+	clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC,
+			USBMODE_CM_HC);
+	/* Select PHY interface after setting host mode */
 	clrsetbits_le32(&usbctlr->hostpc1_devlc, PTS_MASK,
 			PTS_UTMI << PTS_SHIFT);
 	clrbits_le32(&usbctlr->hostpc1_devlc, STS);
@@ -561,6 +565,10 @@ static int init_ulpi_usb_controller(struct fdt_usb *config)
 	clrsetbits_le32(&usbctlr->port_sc1, PTS_MASK,
 			PTS_ULPI << PTS_SHIFT);
 #else
+	/* Set to Host mode after Controller Reset was done */
+	clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC,
+			USBMODE_CM_HC);
+	/* Select PHY interface after setting host mode */
 	clrsetbits_le32(&usbctlr->hostpc1_devlc, PTS_MASK,
 			PTS_ULPI << PTS_SHIFT);
 #endif
@@ -788,19 +796,6 @@ success:
 	*hccr = (struct ehci_hccr *)&usbctlr->cap_length;
 	*hcor = (struct ehci_hcor *)&usbctlr->usb_cmd;
 
-	if (controller->has_hostpc) {
-		/* Set to Host mode after Controller Reset was done */
-		clrsetbits_le32(&usbctlr->usb_mode, USBMODE_CM_HC,
-				USBMODE_CM_HC);
-		/* Select UTMI parallel interface after setting host mode */
-		if (config->utmi) {
-			clrsetbits_le32((char *)&usbctlr->usb_cmd +
-					HOSTPC1_DEVLC, PTS_MASK,
-					PTS_UTMI << PTS_SHIFT);
-			clrbits_le32((char *)&usbctlr->usb_cmd +
-				     HOSTPC1_DEVLC, STS);
-		}
-	}
 	return 0;
 }