USB: EHCI: remove ehci_port_power() routine

This patch (as1623) removes the ehci_port_power() routine and all the
places that call it.  There's no reason for ehci-hcd to change the
port power settings; the hub driver takes care of all that stuff.

There is one exception: When the controller is resumed from
hibernation or following a loss of power, the ports that are supposed
to be handed over to a companion controller must be powered on first.
Otherwise the handover won't work.  This process is not visible to the
hub driver, so it has to be handled in ehci-hcd.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

16 files changed, 20 insertions, 106 deletions

diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index 411bb74152eb..d23321ec0e46 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -53,18 +53,11 @@ static void atmel_stop_ehci(struct platform_device *pdev)
 static int ehci_atmel_setup(struct usb_hcd *hcd)
 {
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-	int retval;
 
 	/* registers start at offset 0x0 */
 	ehci->caps = hcd->regs;
 
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 0);
-
-	return retval;
+	return ehci_setup(hcd);
 }
 
 static const struct hc_driver ehci_atmel_hc_driver = {
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 0d2f35ca93f1..fd9b5424b860 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -349,7 +349,6 @@ static int ehci_fsl_reinit(struct ehci_hcd *ehci)
 {
 	if (ehci_fsl_usb_setup(ehci))
 		return -EINVAL;
-	ehci_port_power(ehci, 0);
 
 	return 0;
 }
diff --git a/drivers/usb/host/ehci-grlib.c b/drivers/usb/host/ehci-grlib.c
index 3180cb3624d9..da4269550fba 100644
--- a/drivers/usb/host/ehci-grlib.c
+++ b/drivers/usb/host/ehci-grlib.c
@@ -34,22 +34,6 @@
 
 #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
 
-/* called during probe() after chip reset completes */
-static int ehci_grlib_setup(struct usb_hcd *hcd)
-{
-	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
-	int		retval;
-
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 1);
-
-	return retval;
-}
-
-
 static const struct hc_driver ehci_grlib_hc_driver = {
 	.description		= hcd_name,
 	.product_desc		= "GRLIB GRUSBHC EHCI",
@@ -64,7 +48,7 @@ static const struct hc_driver ehci_grlib_hc_driver = {
 	/*
 	 * basic lifecycle operations
 	 */
-	.reset			= ehci_grlib_setup,
+	.reset			= ehci_setup,
 	.start			= ehci_run,
 	.stop			= ehci_stop,
 	.shutdown		= ehci_shutdown,
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 68dd1c99b1f5..ab4a769a4104 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -371,24 +371,6 @@ static void ehci_shutdown(struct usb_hcd *hcd)
 	hrtimer_cancel(&ehci->hrtimer);
 }
 
-static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
-{
-	unsigned port;
-
-	if (!HCS_PPC (ehci->hcs_params))
-		return;
-
-	ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
-	for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
-		(void) ehci_hub_control(ehci_to_hcd(ehci),
-				is_on ? SetPortFeature : ClearPortFeature,
-				USB_PORT_FEAT_POWER,
-				port--, NULL, 0);
-	/* Flush those writes */
-	ehci_readl(ehci, &ehci->regs->command);
-	msleep(20);
-}
-
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -1184,9 +1166,6 @@ static int __maybe_unused ehci_resume(struct usb_hcd *hcd, bool hibernated)
 	ehci->rh_state = EHCI_RH_SUSPENDED;
 	spin_unlock_irq(&ehci->lock);
 
-	/* here we "know" root ports should always stay powered */
-	ehci_port_power(ehci, 1);
-
 	return 1;
 }
 
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index a2c56cdd2c3a..a59c61fea09f 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -56,6 +56,19 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
 	if (!ehci->owned_ports)
 		return;
 
+	/* Make sure the ports are powered */
+	port = HCS_N_PORTS(ehci->hcs_params);
+	while (port--) {
+		if (test_bit(port, &ehci->owned_ports)) {
+			reg = &ehci->regs->port_status[port];
+			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
+			if (!(status & PORT_POWER)) {
+				status |= PORT_POWER;
+				ehci_writel(ehci, status, reg);
+			}
+		}
+	}
+
 	/* Give the connections some time to appear */
 	msleep(20);
 
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index 4af4dc5b618c..7fa1ba4de789 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -53,7 +53,6 @@ static int ehci_msm_reset(struct usb_hcd *hcd)
 	/* Disable streaming mode and select host mode */
 	writel(0x13, USB_USBMODE);
 
-	ehci_port_power(ehci, 1);
 	return 0;
 }
 
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
index 4a08fc0b27c9..a37224a4a49b 100644
--- a/drivers/usb/host/ehci-mxc.c
+++ b/drivers/usb/host/ehci-mxc.c
@@ -40,16 +40,10 @@ struct ehci_mxc_priv {
 static int ehci_mxc_setup(struct usb_hcd *hcd)
 {
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-	int retval;
 
 	hcd->has_tt = 1;
 
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 0);
-	return 0;
+	return ehci_setup(hcd);
 }
 
 static const struct hc_driver ehci_mxc_hc_driver = {
diff --git a/drivers/usb/host/ehci-octeon.c b/drivers/usb/host/ehci-octeon.c
index ba26957abf46..a89750fff4ff 100644
--- a/drivers/usb/host/ehci-octeon.c
+++ b/drivers/usb/host/ehci-octeon.c
@@ -159,9 +159,6 @@ static int ehci_octeon_drv_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, hcd);
 
-	/* root ports should always stay powered */
-	ehci_port_power(ehci, 1);
-
 	return 0;
 err3:
 	ehci_octeon_stop();
diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index d7fe287d0678..44e7d0f638e8 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -146,9 +146,6 @@ static int omap_ehci_init(struct usb_hcd *hcd)
 			gpio_set_value_cansleep(pdata->reset_gpio_port[1], 1);
 	}
 
-	/* root ports should always stay powered */
-	ehci_port_power(ehci, 1);
-
 	return rc;
 }
 
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 9c2717d66730..96da679becef 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -101,20 +101,6 @@ static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
 	wrl(USB_MODE, 0x13);
 }
 
-static int ehci_orion_setup(struct usb_hcd *hcd)
-{
-	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-	int retval;
-
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 0);
-
-	return retval;
-}
-
 static const struct hc_driver ehci_orion_hc_driver = {
 	.description = hcd_name,
 	.product_desc = "Marvell Orion EHCI",
@@ -129,7 +115,7 @@ static const struct hc_driver ehci_orion_hc_driver = {
 	/*
 	 * basic lifecycle operations
 	 */
-	.reset = ehci_orion_setup,
+	.reset = ehci_setup,
 	.start = ehci_run,
 	.stop = ehci_stop,
 	.shutdown = ehci_shutdown,
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index e17330ae0aee..c92dcaee0d4d 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -297,7 +297,6 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 		ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
 #endif
 
-	ehci_port_power(ehci, 1);
 	retval = ehci_pci_reinit(ehci, pdev);
 done:
 	return retval;
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 272728c48c9e..6e6c23bdb484 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -40,11 +40,6 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
 
 	if (pdata->no_io_watchdog)
 		ehci->need_io_watchdog = 0;
-	if (pdata->port_power_on)
-		ehci_port_power(ehci, 1);
-	if (pdata->port_power_off)
-		ehci_port_power(ehci, 0);
-
 	return 0;
 }
 
diff --git a/drivers/usb/host/ehci-pmcmsp.c b/drivers/usb/host/ehci-pmcmsp.c
index 087aee2a904f..363890ee41d2 100644
--- a/drivers/usb/host/ehci-pmcmsp.c
+++ b/drivers/usb/host/ehci-pmcmsp.c
@@ -90,7 +90,6 @@ static int ehci_msp_setup(struct usb_hcd *hcd)
 		return retval;
 
 	usb_hcd_tdi_set_mode(ehci);
-	ehci_port_power(ehci, 0);
 
 	return retval;
 }
diff --git a/drivers/usb/host/ehci-sh.c b/drivers/usb/host/ehci-sh.c
index 6081e1ed3ac9..0c90a24fa989 100644
--- a/drivers/usb/host/ehci-sh.c
+++ b/drivers/usb/host/ehci-sh.c
@@ -21,17 +21,10 @@ struct ehci_sh_priv {
 static int ehci_sh_reset(struct usb_hcd *hcd)
 {
 	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
-	int ret;
 
 	ehci->caps = hcd->regs;
 
-	ret = ehci_setup(hcd);
-	if (unlikely(ret))
-		return ret;
-
-	ehci_port_power(ehci, 0);
-
-	return ret;
+	return ehci_setup(hcd);
 }
 
 static const struct hc_driver ehci_sh_hc_driver = {
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index c718a065e154..719ca48a471a 100644
--- a/drivers/usb/host/ehci-spear.c
+++ b/drivers/usb/host/ehci-spear.c
@@ -37,18 +37,11 @@ static void spear_stop_ehci(struct spear_ehci *ehci)
 static int ehci_spear_setup(struct usb_hcd *hcd)
 {
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-	int retval = 0;
 
 	/* registers start at offset 0x0 */
 	ehci->caps = hcd->regs;
 
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 0);
-
-	return retval;
+	return ehci_setup(hcd);
 }
 
 static const struct hc_driver ehci_spear_hc_driver = {
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 2de089001ae9..94ee3212094e 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -280,7 +280,6 @@ static void tegra_ehci_shutdown(struct usb_hcd *hcd)
 static int tegra_ehci_setup(struct usb_hcd *hcd)
 {
 	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-	int retval;
 
 	/* EHCI registers start at offset 0x100 */
 	ehci->caps = hcd->regs + 0x100;
@@ -288,12 +287,7 @@ static int tegra_ehci_setup(struct usb_hcd *hcd)
 	/* switch to host mode */
 	hcd->has_tt = 1;
 
-	retval = ehci_setup(hcd);
-	if (retval)
-		return retval;
-
-	ehci_port_power(ehci, 1);
-	return retval;
+	return ehci_setup(hcd);
 }
 
 struct dma_aligned_buffer {