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Revert "usb:cdns3 Fix for stuck packets in on-chip OUT buffer." 

This reverts commit 573aff747e.

It's broken.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-07-04 13:00:50 +02:00
parent a387fd90d4
commit bff2a75bd7
2 changed files with 2 additions and 341 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

330
drivers/usb/cdns3/gadget.c
View File

@ -28,32 +28,6 @@
*
* Issue has been fixed in DEV_VER_V3 version of controller.
*
* Work around 2:
* Controller for OUT endpoints has shared on-chip buffers for all incoming
* packets, including ep0out. It's FIFO buffer, so packets must be handle by DMA
* in correct order. If the first packet in the buffer will not be handled,
* then the following packets directed for other endpoints and functions
* will be blocked.
* Additionally the packets directed to one endpoint can block entire on-chip
* buffers. In this case transfer to other endpoints also will blocked.
*
* To resolve this issue after raising the descriptor missing interrupt
* driver prepares internal usb_request object and use it to arm DMA transfer.
*
* The problematic situation was observed in case when endpoint has been enabled
* but no usb_request were queued. Driver try detects such endpoints and will
* use this workaround only for these endpoint.
*
* Driver use limited number of buffer. This number can be set by macro
* CDNS3_WA2_NUM_BUFFERS.
*
* Such blocking situation was observed on ACM gadget. For this function
* host send OUT data packet but ACM function is not prepared for this packet.
* It's cause that buffer placed in on chip memory block transfer to other
* endpoints.
*
* Issue has been fixed in DEV_VER_V2 version of controller.
*
*/
#include <linux/dma-mapping.h>
@ -124,17 +98,6 @@ struct cdns3_aligned_buf *cdns3_next_align_buf(struct list_head *list)
return list_first_entry_or_null(list, struct cdns3_aligned_buf, list);
}
/**
* cdns3_next_priv_request - returns next request from list
* @list: list containing requests
*
* Returns request or NULL if no requests in list
*/
struct cdns3_request *cdns3_next_priv_request(struct list_head *list)
{
return list_first_entry_or_null(list, struct cdns3_request, list);
}
/**
* select_ep - selects endpoint
* @priv_dev: extended gadget object
@ -372,246 +335,6 @@ static int cdns3_start_all_request(struct cdns3_device *priv_dev,
return ret;
}
/*
* WA2: Set flag for all not ISOC OUT endpoints. If this flag is set
* driver try to detect whether endpoint need additional internal
* buffer for unblocking on-chip FIFO buffer. This flag will be cleared
* if before first DESCMISS interrupt the DMA will be armed.
*/
#define cdns3_wa2_enable_detection(priv_dev, ep_priv, reg) do { \
if (!priv_ep->dir && priv_ep->type != USB_ENDPOINT_XFER_ISOC) { \
priv_ep->flags |= EP_QUIRK_EXTRA_BUF_DET; \
(reg) |= EP_STS_EN_DESCMISEN; \
} } while (0)
/**
* cdns3_wa2_descmiss_copy_data copy data from internal requests to
* request queued by class driver.
* @priv_ep: extended endpoint object
* @request: request object
*/
static void cdns3_wa2_descmiss_copy_data(struct cdns3_endpoint *priv_ep,
struct usb_request *request)
{
struct usb_request *descmiss_req;
struct cdns3_request *descmiss_priv_req;
while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
int chunk_end;
int length;
descmiss_priv_req =
cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
descmiss_req = &descmiss_priv_req->request;
/* driver can't touch pending request */
if (descmiss_priv_req->flags & REQUEST_PENDING)
break;
chunk_end = descmiss_priv_req->flags & REQUEST_INTERNAL_CH;
length = request->actual + descmiss_req->actual;
request->status = descmiss_req->status;
if (length <= request->length) {
memcpy(&((u8 *)request->buf)[request->actual],
descmiss_req->buf,
descmiss_req->actual);
request->actual = length;
} else {
/* It should never occures */
request->status = -ENOMEM;
}
list_del_init(&descmiss_priv_req->list);
kfree(descmiss_req->buf);
cdns3_gadget_ep_free_request(&priv_ep->endpoint, descmiss_req);
--priv_ep->wa2_counter;
if (!chunk_end)
break;
}
}
struct usb_request *cdns3_wa2_gadget_giveback(struct cdns3_device *priv_dev,
struct cdns3_endpoint *priv_ep,
struct cdns3_request *priv_req)
{
if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN &&
priv_req->flags & REQUEST_INTERNAL) {
struct usb_request *req;
req = cdns3_next_request(&priv_ep->deferred_req_list);
priv_ep->descmis_req = NULL;
if (!req)
return NULL;
cdns3_wa2_descmiss_copy_data(priv_ep, req);
if (!(priv_ep->flags & EP_QUIRK_END_TRANSFER) &&
req->length != req->actual) {
/* wait for next part of transfer */
return NULL;
}
if (req->status == -EINPROGRESS)
req->status = 0;
list_del_init(&req->list);
cdns3_start_all_request(priv_dev, priv_ep);
return req;
}
return &priv_req->request;
}
int cdns3_wa2_gadget_ep_queue(struct cdns3_device *priv_dev,
struct cdns3_endpoint *priv_ep,
struct cdns3_request *priv_req)
{
int deferred = 0;
/*
* If transfer was queued before DESCMISS appear than we
* can disable handling of DESCMISS interrupt. Driver assumes that it
* can disable special treatment for this endpoint.
*/
if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
u32 reg;
cdns3_select_ep(priv_dev, priv_ep->num | priv_ep->dir);
priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
reg = readl(&priv_dev->regs->ep_sts_en);
reg &= ~EP_STS_EN_DESCMISEN;
writel(reg, &priv_dev->regs->ep_sts_en);
}
if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
u8 pending_empty = list_empty(&priv_ep->pending_req_list);
u8 descmiss_empty = list_empty(&priv_ep->wa2_descmiss_req_list);
/*
* DESCMISS transfer has been finished, so data will be
* directly copied from internal allocated usb_request
* objects.
*/
if (pending_empty && !descmiss_empty &&
!(priv_req->flags & REQUEST_INTERNAL)) {
cdns3_wa2_descmiss_copy_data(priv_ep,
&priv_req->request);
list_add_tail(&priv_req->request.list,
&priv_ep->pending_req_list);
cdns3_gadget_giveback(priv_ep, priv_req,
priv_req->request.status);
/*
* Intentionally driver returns positive value as
* correct value. It informs that transfer has
* been finished.
*/
return EINPROGRESS;
}
/*
* Driver will wait for completion DESCMISS transfer,
* before starts new, not DESCMISS transfer.
*/
if (!pending_empty && !descmiss_empty)
deferred = 1;
if (priv_req->flags & REQUEST_INTERNAL)
list_add_tail(&priv_req->list,
&priv_ep->wa2_descmiss_req_list);
}
return deferred;
}
static void cdsn3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep)
{
struct cdns3_request *priv_req;
while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
u8 chain;
priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
chain = !!(priv_req->flags & REQUEST_INTERNAL_CH);
kfree(priv_req->request.buf);
cdns3_gadget_ep_free_request(&priv_ep->endpoint,
&priv_req->request);
list_del_init(&priv_req->list);
--priv_ep->wa2_counter;
if (!chain)
break;
}
}
/**
* cdns3_wa2_descmissing_packet - handles descriptor missing event.
* @priv_dev: extended gadget object
*
* This function is used only for WA2. For more information see Work around 2
* description.
*/
static void cdns3_wa2_descmissing_packet(struct cdns3_endpoint *priv_ep)
{
struct cdns3_request *priv_req;
struct usb_request *request;
if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET) {
priv_ep->flags &= ~EP_QUIRK_EXTRA_BUF_DET;
priv_ep->flags |= EP_QUIRK_EXTRA_BUF_EN;
}
cdns3_dbg(priv_ep->cdns3_dev, "WA2: Description Missing detected\n");
if (priv_ep->wa2_counter >= CDNS3_WA2_NUM_BUFFERS)
cdsn3_wa2_remove_old_request(priv_ep);
request = cdns3_gadget_ep_alloc_request(&priv_ep->endpoint,
GFP_ATOMIC);
if (!request)
goto err;
priv_req = to_cdns3_request(request);
priv_req->flags |= REQUEST_INTERNAL;
/* if this field is still assigned it indicate that transfer related
* with this request has not been finished yet. Driver in this
* case simply allocate next request and assign flag REQUEST_INTERNAL_CH
* flag to previous one. It will indicate that current request is
* part of the previous one.
*/
if (priv_ep->descmis_req)
priv_ep->descmis_req->flags |= REQUEST_INTERNAL_CH;
priv_req->request.buf = kzalloc(CDNS3_DESCMIS_BUF_SIZE,
GFP_ATOMIC);
priv_ep->wa2_counter++;
if (!priv_req->request.buf) {
cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
goto err;
}
priv_req->request.length = CDNS3_DESCMIS_BUF_SIZE;
priv_ep->descmis_req = priv_req;
__cdns3_gadget_ep_queue(&priv_ep->endpoint,
&priv_ep->descmis_req->request,
GFP_ATOMIC);
return;
err:
dev_err(priv_ep->cdns3_dev->dev,
"Failed: No sufficient memory for DESCMIS\n");
}
/**
* cdns3_gadget_giveback - call struct usb_request's ->complete callback
* @priv_ep: The endpoint to whom the request belongs to
@ -645,13 +368,6 @@ void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED);
trace_cdns3_gadget_giveback(priv_req);
if (priv_dev->dev_ver < DEV_VER_V2) {
request = cdns3_wa2_gadget_giveback(priv_dev, priv_ep,
priv_req);
if (!request)
return;
}
if (request->complete) {
spin_unlock(&priv_dev->lock);
usb_gadget_giveback_request(&priv_ep->endpoint,
@ -1205,25 +921,8 @@ static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep)
}
}
if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
if (priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN) {
if (ep_sts_reg & EP_STS_ISP)
priv_ep->flags |= EP_QUIRK_END_TRANSFER;
else
priv_ep->flags &= ~EP_QUIRK_END_TRANSFER;
}
if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP))
cdns3_transfer_completed(priv_dev, priv_ep);
}
/*
* WA2: this condition should only be meet when
* priv_ep->flags & EP_QUIRK_EXTRA_BUF_DET or
* priv_ep->flags & EP_QUIRK_EXTRA_BUF_EN.
* In other cases this interrupt will be disabled/
*/
if (ep_sts_reg & EP_STS_DESCMIS && priv_dev->dev_ver < DEV_VER_V2)
cdns3_wa2_descmissing_packet(priv_ep);
return 0;
}
@ -1799,9 +1498,6 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep,
cdns3_set_register_bit(&priv_dev->regs->ep_ien,
BIT(cdns3_ep_addr_to_index(bEndpointAddress)));
if (priv_dev->dev_ver < DEV_VER_V2)
cdns3_wa2_enable_detection(priv_dev, priv_ep, reg);
writel(reg, &priv_dev->regs->ep_sts_en);
/*
@ -1820,7 +1516,7 @@ static int cdns3_gadget_ep_enable(struct usb_ep *ep,
ep->desc = desc;
priv_ep->flags &= ~(EP_PENDING_REQUEST | EP_STALL |
EP_QUIRK_ISO_OUT_EN | EP_QUIRK_EXTRA_BUF_EN);
EP_QUIRK_ISO_OUT_EN);
priv_ep->flags |= EP_ENABLED | EP_UPDATE_EP_TRBADDR;
priv_ep->wa1_set = 0;
priv_ep->enqueue = 0;
@ -1845,7 +1541,6 @@ exit:
static int cdns3_gadget_ep_disable(struct usb_ep *ep)
{
struct cdns3_endpoint *priv_ep;
struct cdns3_request *priv_req;
struct cdns3_device *priv_dev;
struct usb_request *request;
unsigned long flags;
@ -1898,16 +1593,6 @@ static int cdns3_gadget_ep_disable(struct usb_ep *ep)
-ESHUTDOWN);
}
while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
kfree(priv_req->request.buf);
cdns3_gadget_ep_free_request(&priv_ep->endpoint,
&priv_req->request);
list_del_init(&priv_req->list);
--priv_ep->wa2_counter;
}
while (!list_empty(&priv_ep->deferred_req_list)) {
request = cdns3_next_request(&priv_ep->deferred_req_list);
@ -1915,8 +1600,6 @@ static int cdns3_gadget_ep_disable(struct usb_ep *ep)
-ESHUTDOWN);
}
priv_ep->descmis_req = NULL;
ep->desc = NULL;
priv_ep->flags &= ~EP_ENABLED;
@ -1947,14 +1630,6 @@ static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
priv_req = to_cdns3_request(request);
trace_cdns3_ep_queue(priv_req);
if (priv_dev->dev_ver < DEV_VER_V2) {
ret = cdns3_wa2_gadget_ep_queue(priv_dev, priv_ep,
priv_req);
if (ret == EINPROGRESS)
return 0;
}
ret = cdns3_prepare_aligned_request_buf(priv_req);
if (ret < 0)
return ret;
@ -2423,7 +2098,6 @@ static int cdns3_init_eps(struct cdns3_device *priv_dev)
INIT_LIST_HEAD(&priv_ep->pending_req_list);
INIT_LIST_HEAD(&priv_ep->deferred_req_list);
INIT_LIST_HEAD(&priv_ep->wa2_descmiss_req_list);
}
return 0;

13
drivers/usb/cdns3/gadget.h
View File

@ -1079,7 +1079,6 @@ struct cdns3_trb {
#define CDNS3_EP_ISO_SS_BURST 3
#define CDNS3_MAX_NUM_DESCMISS_BUF 32
#define CDNS3_DESCMIS_BUF_SIZE 2048 /* Bytes */
#define CDNS3_WA2_NUM_BUFFERS 128
/*-------------------------------------------------------------------------*/
/* Used structs */
@ -1090,15 +1089,11 @@ struct cdns3_device;
* @endpoint: usb endpoint
* @pending_req_list: list of requests queuing on transfer ring.
* @deferred_req_list: list of requests waiting for queuing on transfer ring.
* @wa2_descmiss_req_list: list of requests internally allocated by driver.
* @trb_pool: transfer ring - array of transaction buffers
* @trb_pool_dma: dma address of transfer ring
* @cdns3_dev: device associated with this endpoint
* @name: a human readable name e.g. ep1out
* @flags: specify the current state of endpoint
* @descmis_req: internal transfer object used for getting data from on-chip
* buffer. It can happen only if function driver doesn't send usb_request
* object on time.
* @dir: endpoint direction
* @num: endpoint number (1 - 15)
* @type: set to bmAttributes & USB_ENDPOINT_XFERTYPE_MASK
@ -1115,8 +1110,6 @@ struct cdns3_endpoint {
struct usb_ep endpoint;
struct list_head pending_req_list;
struct list_head deferred_req_list;
struct list_head wa2_descmiss_req_list;
int wa2_counter;
struct cdns3_trb *trb_pool;
dma_addr_t trb_pool_dma;
@ -1134,13 +1127,8 @@ struct cdns3_endpoint {
#define EP_CLAIMED BIT(7)
#define EP_DEFERRED_DRDY BIT(8)
#define EP_QUIRK_ISO_OUT_EN BIT(9)
#define EP_QUIRK_EXTRA_BUF_DET BIT(10)
#define EP_QUIRK_EXTRA_BUF_EN BIT(11)
#define EP_QUIRK_END_TRANSFER BIT(12)
u32 flags;
struct cdns3_request *descmis_req;
u8 dir;
u8 num;
u8 type;
@ -1188,7 +1176,6 @@ struct cdns3_aligned_buf {
* @aligned_buf: object holds information about aligned buffer associated whit
* this endpoint
* @flags: flag specifying special usage of request
* @list: used by internally allocated request to add to wa2_descmiss_req_list.
*/
struct cdns3_request {
struct usb_request request;