This is a note to let you know that I've just added the patch titled
usb: dwc3: Fix assignment of EP transfer resources
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-fix-assignment-of-ep-transfer-resources.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c450960187f45d4260db87c7dd4fc0bceb5565d8 Mon Sep 17 00:00:00 2001
From: John Youn <John.Youn@xxxxxxxxxxxx>
Date: Tue, 16 Feb 2016 20:10:53 -0800
Subject: usb: dwc3: Fix assignment of EP transfer resources
From: John Youn <John.Youn@xxxxxxxxxxxx>
commit c450960187f45d4260db87c7dd4fc0bceb5565d8 upstream.
The assignement of EP transfer resources was not handled properly in the
dwc3 driver. Commit aebda6187181 ("usb: dwc3: Reset the transfer
resource index on SET_INTERFACE") previously fixed one aspect of this
where resources may be exhausted with multiple calls to SET_INTERFACE.
However, it introduced an issue where composite devices with multiple
interfaces can be assigned the same transfer resources for different
endpoints. This patch solves both issues.
The assignment of transfer resources cannot perfectly follow the data
book due to the fact that the controller driver does not have all
knowledge of the configuration in advance. It is given this information
piecemeal by the composite gadget framework after every
SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
programming model in this scenario can cause errors. For two reasons:
1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION and
SET_INTERFACE (8.1.5). This is incorrect in the scenario of multiple
interfaces.
2) The databook does not mention doing more DEPXFERCFG for new endpoint
on alt setting (8.1.6).
The following simplified method is used instead:
All hardware endpoints can be assigned a transfer resource and this
setting will stay persistent until either a core reset or hibernation.
So whenever we do a DEPSTARTCFG(0) we can go ahead and do DEPXFERCFG for
every hardware endpoint as well. We are guaranteed that there are as
many transfer resources as endpoints.
This patch triggers off of the calling dwc3_gadget_start_config() for
EP0-out, which always happens first, and which should only happen in one
of the above conditions.
Fixes: aebda6187181 ("usb: dwc3: Reset the transfer resource index on SET_INTERFACE")
Reported-by: Ravi Babu <ravibabu@xxxxxx>
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.h | 1
drivers/usb/dwc3/ep0.c | 5 ---
drivers/usb/dwc3/gadget.c | 70 ++++++++++++++++++++++++++++++++++------------
3 files changed, 52 insertions(+), 24 deletions(-)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -853,7 +853,6 @@ struct dwc3 {
unsigned pullups_connected:1;
unsigned resize_fifos:1;
unsigned setup_packet_pending:1;
- unsigned start_config_issued:1;
unsigned three_stage_setup:1;
unsigned usb3_lpm_capable:1;
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -555,7 +555,6 @@ static int dwc3_ep0_set_config(struct dw
int ret;
u32 reg;
- dwc->start_config_issued = false;
cfg = le16_to_cpu(ctrl->wValue);
switch (state) {
@@ -737,10 +736,6 @@ static int dwc3_ep0_std_request(struct d
dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_ISOCH_DELAY");
ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
break;
- case USB_REQ_SET_INTERFACE:
- dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_INTERFACE");
- dwc->start_config_issued = false;
- /* Fall through */
default:
dwc3_trace(trace_dwc3_ep0, "Forwarding to gadget driver");
ret = dwc3_ep0_delegate_req(dwc, ctrl);
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -388,24 +388,66 @@ static void dwc3_free_trb_pool(struct dw
dep->trb_pool_dma = 0;
}
+static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
+
+/**
+ * dwc3_gadget_start_config - Configure EP resources
+ * @dwc: pointer to our controller context structure
+ * @dep: endpoint that is being enabled
+ *
+ * The assignment of transfer resources cannot perfectly follow the
+ * data book due to the fact that the controller driver does not have
+ * all knowledge of the configuration in advance. It is given this
+ * information piecemeal by the composite gadget framework after every
+ * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
+ * programming model in this scenario can cause errors. For two
+ * reasons:
+ *
+ * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
+ * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
+ * multiple interfaces.
+ *
+ * 2) The databook does not mention doing more DEPXFERCFG for new
+ * endpoint on alt setting (8.1.6).
+ *
+ * The following simplified method is used instead:
+ *
+ * All hardware endpoints can be assigned a transfer resource and this
+ * setting will stay persistent until either a core reset or
+ * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
+ * do DEPXFERCFG for every hardware endpoint as well. We are
+ * guaranteed that there are as many transfer resources as endpoints.
+ *
+ * This function is called for each endpoint when it is being enabled
+ * but is triggered only when called for EP0-out, which always happens
+ * first, and which should only happen in one of the above conditions.
+ */
static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
{
struct dwc3_gadget_ep_cmd_params params;
u32 cmd;
+ int i;
+ int ret;
+
+ if (dep->number)
+ return 0;
memset(¶ms, 0x00, sizeof(params));
+ cmd = DWC3_DEPCMD_DEPSTARTCFG;
- if (dep->number != 1) {
- cmd = DWC3_DEPCMD_DEPSTARTCFG;
- /* XferRscIdx == 0 for ep0 and 2 for the remaining */
- if (dep->number > 1) {
- if (dwc->start_config_issued)
- return 0;
- dwc->start_config_issued = true;
- cmd |= DWC3_DEPCMD_PARAM(2);
- }
+ ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
+ struct dwc3_ep *dep = dwc->eps[i];
- return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
+ if (!dep)
+ continue;
+
+ ret = dwc3_gadget_set_xfer_resource(dwc, dep);
+ if (ret)
+ return ret;
}
return 0;
@@ -519,10 +561,6 @@ static int __dwc3_gadget_ep_enable(struc
struct dwc3_trb *trb_st_hw;
struct dwc3_trb *trb_link;
- ret = dwc3_gadget_set_xfer_resource(dwc, dep);
- if (ret)
- return ret;
-
dep->endpoint.desc = desc;
dep->comp_desc = comp_desc;
dep->type = usb_endpoint_type(desc);
@@ -1604,8 +1642,6 @@ static int dwc3_gadget_start(struct usb_
}
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
- dwc->start_config_issued = false;
-
/* Start with SuperSpeed Default */
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
@@ -2202,7 +2238,6 @@ static void dwc3_gadget_disconnect_inter
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
dwc3_disconnect_gadget(dwc);
- dwc->start_config_issued = false;
dwc->gadget.speed = USB_SPEED_UNKNOWN;
dwc->setup_packet_pending = false;
@@ -2253,7 +2288,6 @@ static void dwc3_gadget_reset_interrupt(
dwc3_stop_active_transfers(dwc);
dwc3_clear_stall_all_ep(dwc);
- dwc->start_config_issued = false;
/* Reset device address to zero */
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
Patches currently in stable-queue which might be from John.Youn@xxxxxxxxxxxx are
queue-4.4/usb-dwc3-fix-assignment-of-ep-transfer-resources.patch
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