* [PATCH v2 1/1] xhci: add USB2 test mode support
@ 2017-02-08 13:44 Alexander Stein
2017-02-08 13:51 ` Greg Kroah-Hartman
2017-02-08 14:17 ` Mathias Nyman
0 siblings, 2 replies; 4+ messages in thread
From: Alexander Stein @ 2017-02-08 13:44 UTC (permalink / raw)
To: Mathias Nyman, Greg Kroah-Hartman
Cc: Alexander Stein, linux-usb, linux-kernel, Wang, Yu, Li, Guanglei,
Wu, Hao
This patch adds support for USB2 test mode (Test_J, Test_K,
Test_SE0_NAK and Test_Packet) per XHCI spec 4.19.6.
USB2 test mode is a required hardware feature for system integrators
validating their hardware according to USB spec, regarding signal
strength and stuff. It is purely a hardware test feature.
Usually you need an oscilloscope and have to enable those test modes on
the hardware. This will send some specific test patterns on D+/D-. There
is no report available (in Linux itself) as it is purely externally
visible. Regular USB usage is not possible at that time.
Anyone (well access to e.g. /dev/bus/usb/001/001 provided) can use it by
sending appropriate USB_PORT_FEAT_TEST requests to the hub.
The same feature for ehci based hosts is already available at
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/host/ehci-hub.c#n1267
Signed-off-by: "Wang, Yu" <yu.y.wang@intel.com>
Signed-off-by: "Li, Guanglei" <guangleix.li@intel.com>
Signed-off-by: "Wu, Hao" <hao.wu@intel.com>
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
---
Changes in v2:
* Added additional info about USB2 test modes itself into commit message
* Add URL for same test mode feature on ehci hosts.
drivers/usb/host/xhci-hub.c | 63 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 62 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 0ef1690..cd561f1 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -879,13 +879,14 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
int max_ports;
unsigned long flags;
u32 temp, status;
- int retval = 0;
+ int i, retval = 0;
__le32 __iomem **port_array;
int slot_id;
struct xhci_bus_state *bus_state;
u16 link_state = 0;
u16 wake_mask = 0;
u16 timeout = 0;
+ u16 selector = 0;
max_ports = xhci_get_ports(hcd, &port_array);
bus_state = &xhci->bus_state[hcd_index(hcd)];
@@ -959,6 +960,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
link_state = (wIndex & 0xff00) >> 3;
if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
wake_mask = wIndex & 0xff00;
+ if (wValue == USB_PORT_FEAT_TEST)
+ selector = (wIndex & 0xff00) >> 8;
/* The MSB of wIndex is the U1/U2 timeout */
timeout = (wIndex & 0xff00) >> 8;
wIndex &= 0xff;
@@ -1134,6 +1137,64 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
temp |= PORT_U2_TIMEOUT(timeout);
writel(temp, port_array[wIndex] + PORTPMSC);
break;
+ case USB_PORT_FEAT_TEST:
+ /* 4.19.6 Port Test Modes (USB2 Test Mode) */
+ if (hcd->speed != HCD_USB2)
+ goto error;
+
+ /* FIXME: Test_Force_Enable case to be implemented */
+ if (selector < TEST_J || selector > TEST_PACKET)
+ goto error;
+
+ /* Disable all Device Slots */
+ for (i = 0; i < MAX_HC_SLOTS; i++) {
+ struct xhci_command *command;
+
+ if (!xhci->dcbaa->dev_context_ptrs[i])
+ continue;
+ command = xhci_alloc_command(xhci, false,
+ false, GFP_ATOMIC);
+ if (!command)
+ return -ENOMEM;
+ if (xhci_queue_slot_control(xhci, command,
+ TRB_DISABLE_SLOT, i)) {
+ xhci_err(xhci,
+ "Disable slot[%d] fail!\n", i);
+ goto error;
+ }
+ xhci_dbg(xhci, "Disable Slot[%d].\n", i);
+ }
+
+ /* Put all ports to the Disable state by clear PP */
+ xhci_dbg(xhci, "Disable all port (PP = 0)\n");
+ for (i = 0; i < max_ports; i++) {
+ temp = readl(port_array[i]);
+ temp &= ~PORT_POWER;
+ writel(temp, port_array[i]);
+ }
+
+ /* Stop the controller */
+ xhci_dbg(xhci, "Stop controller\n");
+ temp = readl(&xhci->op_regs->command);
+ temp &= ~CMD_RUN;
+ writel(temp, &xhci->op_regs->command);
+
+ if (xhci_handshake(&xhci->op_regs->status,
+ STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC)) {
+ xhci_warn(xhci, "Stop controller timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ /* Disable runtime PM for test mode */
+ pm_runtime_forbid(hcd->self.controller);
+
+ /* Set PORTPMSC.PTC field for selected test mode */
+ xhci_dbg(xhci, "Enter Test Mode: %d\n", selector);
+ temp = readl(port_array[wIndex] + PORTPMSC);
+ temp |= selector << 28;
+ writel(temp, port_array[wIndex] + PORTPMSC);
+
+ break;
default:
goto error;
}
--
2.10.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/1] xhci: add USB2 test mode support
2017-02-08 13:44 [PATCH v2 1/1] xhci: add USB2 test mode support Alexander Stein
@ 2017-02-08 13:51 ` Greg Kroah-Hartman
2017-02-08 14:17 ` Mathias Nyman
1 sibling, 0 replies; 4+ messages in thread
From: Greg Kroah-Hartman @ 2017-02-08 13:51 UTC (permalink / raw)
To: Alexander Stein
Cc: Mathias Nyman, linux-usb, linux-kernel, Wang, Yu, Li, Guanglei, Wu, Hao
On Wed, Feb 08, 2017 at 02:44:44PM +0100, Alexander Stein wrote:
> This patch adds support for USB2 test mode (Test_J, Test_K,
> Test_SE0_NAK and Test_Packet) per XHCI spec 4.19.6.
>
> USB2 test mode is a required hardware feature for system integrators
> validating their hardware according to USB spec, regarding signal
> strength and stuff. It is purely a hardware test feature.
>
> Usually you need an oscilloscope and have to enable those test modes on
> the hardware. This will send some specific test patterns on D+/D-. There
> is no report available (in Linux itself) as it is purely externally
> visible. Regular USB usage is not possible at that time.
> Anyone (well access to e.g. /dev/bus/usb/001/001 provided) can use it by
> sending appropriate USB_PORT_FEAT_TEST requests to the hub.
> The same feature for ehci based hosts is already available at
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/host/ehci-hub.c#n1267
>
> Signed-off-by: "Wang, Yu" <yu.y.wang@intel.com>
> Signed-off-by: "Li, Guanglei" <guangleix.li@intel.com>
> Signed-off-by: "Wu, Hao" <hao.wu@intel.com>
> Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
> ---
> Changes in v2:
> * Added additional info about USB2 test modes itself into commit message
> * Add URL for same test mode feature on ehci hosts.
Much nicer, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/1] xhci: add USB2 test mode support
2017-02-08 13:44 [PATCH v2 1/1] xhci: add USB2 test mode support Alexander Stein
2017-02-08 13:51 ` Greg Kroah-Hartman
@ 2017-02-08 14:17 ` Mathias Nyman
2017-02-08 15:10 ` Alexander Stein
1 sibling, 1 reply; 4+ messages in thread
From: Mathias Nyman @ 2017-02-08 14:17 UTC (permalink / raw)
To: Alexander Stein, Mathias Nyman, Greg Kroah-Hartman
Cc: linux-usb, linux-kernel, Wang, Yu, Li, Guanglei, Wu, Hao
On 08.02.2017 15:44, Alexander Stein wrote:
> This patch adds support for USB2 test mode (Test_J, Test_K,
> Test_SE0_NAK and Test_Packet) per XHCI spec 4.19.6.
>
> USB2 test mode is a required hardware feature for system integrators
> validating their hardware according to USB spec, regarding signal
> strength and stuff. It is purely a hardware test feature.
>
> Usually you need an oscilloscope and have to enable those test modes on
> the hardware. This will send some specific test patterns on D+/D-. There
> is no report available (in Linux itself) as it is purely externally
> visible. Regular USB usage is not possible at that time.
> Anyone (well access to e.g. /dev/bus/usb/001/001 provided) can use it by
> sending appropriate USB_PORT_FEAT_TEST requests to the hub.
> The same feature for ehci based hosts is already available at
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/host/ehci-hub.c#n1267
>
> Signed-off-by: "Wang, Yu" <yu.y.wang@intel.com>
> Signed-off-by: "Li, Guanglei" <guangleix.li@intel.com>
> Signed-off-by: "Wu, Hao" <hao.wu@intel.com>
> Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
> ---
I think there's a reworked series of this feature already posted at:
http://marc.info/?l=linux-usb&m=148050258916147&w=2
But this change log is now better
I was thinking about adding that to 4.12
-Mathias
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/1] xhci: add USB2 test mode support
2017-02-08 14:17 ` Mathias Nyman
@ 2017-02-08 15:10 ` Alexander Stein
0 siblings, 0 replies; 4+ messages in thread
From: Alexander Stein @ 2017-02-08 15:10 UTC (permalink / raw)
To: Mathias Nyman
Cc: Mathias Nyman, Greg Kroah-Hartman, linux-usb, linux-kernel, Wang,
Yu, Li, Guanglei, Wu, Hao
On Wednesday 08 February 2017 16:17:45, Mathias Nyman wrote:
> On 08.02.2017 15:44, Alexander Stein wrote:
> > This patch adds support for USB2 test mode (Test_J, Test_K,
> > Test_SE0_NAK and Test_Packet) per XHCI spec 4.19.6.
> >
> > USB2 test mode is a required hardware feature for system integrators
> > validating their hardware according to USB spec, regarding signal
> > strength and stuff. It is purely a hardware test feature.
> >
> > Usually you need an oscilloscope and have to enable those test modes on
> > the hardware. This will send some specific test patterns on D+/D-. There
> > is no report available (in Linux itself) as it is purely externally
> > visible. Regular USB usage is not possible at that time.
> > Anyone (well access to e.g. /dev/bus/usb/001/001 provided) can use it by
> > sending appropriate USB_PORT_FEAT_TEST requests to the hub.
> > The same feature for ehci based hosts is already available at
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drive
> > rs/usb/host/ehci-hub.c#n1267
> >
> > Signed-off-by: "Wang, Yu" <yu.y.wang@intel.com>
> > Signed-off-by: "Li, Guanglei" <guangleix.li@intel.com>
> > Signed-off-by: "Wu, Hao" <hao.wu@intel.com>
> > Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
> > ---
>
> I think there's a reworked series of this feature already posted at:
>
> http://marc.info/?l=linux-usb&m=148050258916147&w=2
>
> But this change log is now better
> I was thinking about adding that to 4.12
Interesting, I was not aware of that. This patchset seems better and cleaner
than my patch. It even powers off all USB3 _and_ USB2 ports. In my patch only
USB3 ports are powered off. Also TEST_FORCE_EN seems to be supported.
Feel free to take that series and use my commit message as appropriate.
Best regards,
Alexader
--
Dipl.-Inf. Alexander Stein
SYS TEC electronic GmbH
alexander.stein@systec-electronic.com
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2017-02-08 13:44 [PATCH v2 1/1] xhci: add USB2 test mode support Alexander Stein
2017-02-08 13:51 ` Greg Kroah-Hartman
2017-02-08 14:17 ` Mathias Nyman
2017-02-08 15:10 ` Alexander Stein
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