On 25-06-20 08:23:12, Pawel Laszczak wrote:
The SSP2 controller has extra endpoint state preserve bit (ESP) which setting causes that endpoint state will be preserved during Halt Endpoint command. It is used only for EP0. Without this bit the Command Verifier "TD 9.10 Bad Descriptor Test" failed. Setting this bit doesn't have any impact for SSP controller.
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") cc: stable@vger.kernel.org Signed-off-by: Pawel Laszczak pawell@cadence.com
Changelog: v3:
- removed else {}
v2:
- removed some typos
- added pep variable initialization
- updated TRB_ESP description
drivers/usb/cdns3/cdnsp-debug.h | 5 +++-- drivers/usb/cdns3/cdnsp-ep0.c | 18 +++++++++++++++--- drivers/usb/cdns3/cdnsp-gadget.h | 6 ++++++ drivers/usb/cdns3/cdnsp-ring.c | 3 ++- 4 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/cdns3/cdnsp-debug.h b/drivers/usb/cdns3/cdnsp-debug.h index cd138acdcce1..86860686d836 100644 --- a/drivers/usb/cdns3/cdnsp-debug.h +++ b/drivers/usb/cdns3/cdnsp-debug.h @@ -327,12 +327,13 @@ static inline const char *cdnsp_decode_trb(char
*str, size_t size, u32 field0,
case TRB_RESET_EP: case TRB_HALT_ENDPOINT: ret = scnprintf(str, size,
"%s: ep%d%s(%d) ctx %08x%08x slot %ld flags%c",
"%s: ep%d%s(%d) ctx %08x%08x slot %ld flags%c %c",
cdnsp_trb_type_string(type), ep_num, ep_id % 2 ? "out" : "in", TRB_TO_EP_INDEX(field3), field1, field0, TRB_TO_SLOT_ID(field3),
field3 & TRB_CYCLE ? 'C' : 'c');
field3 & TRB_CYCLE ? 'C' : 'c',field3 & TRB_ESP ? 'P' : 'p');diff --git a/drivers/usb/cdns3/cdnsp-ep0.c b/drivers/usb/cdns3/cdnsp-ep0.c index f317d3c84781..5cd9b898ce97 100644 --- a/drivers/usb/cdns3/cdnsp-ep0.c +++ b/drivers/usb/cdns3/cdnsp-ep0.c @@ -414,6 +414,7 @@ static int cdnsp_ep0_std_request(struct cdnsp_device *pdev, void cdnsp_setup_analyze(struct cdnsp_device *pdev) { struct usb_ctrlrequest *ctrl = &pdev->setup;
- struct cdnsp_ep *pep; int ret = -EINVAL; u16 len;
@@ -427,10 +428,21 @@ void cdnsp_setup_analyze(struct cdnsp_device
*pdev)
goto out;}
- pep = &pdev->eps[0];
- /* Restore the ep0 to Stopped/Running state. */
- if (pdev->eps[0].ep_state & EP_HALTED) {
trace_cdnsp_ep0_halted("Restore to normal state");cdnsp_halt_endpoint(pdev, &pdev->eps[0], 0);
- if (pep->ep_state & EP_HALTED) {
if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_HALTED)cdnsp_halt_endpoint(pdev, pep, 0);/** Halt Endpoint Command for SSP2 for ep0 preserve current* endpoint state and driver has to synchronize the* software endpoint state with endpoint output context* state.*/pep->ep_state &= ~EP_HALTED;pep->ep_state |= EP_STOPPED;You do not reset endpoint by calling clear_halt, could we change ep_state directly?
It's only "software" endpoint state and this code is related only with ep0. For SSP2 the state in pep->out_ctx - "hardware" endpoint state in this place will be in EP_STATE_STOPPED but "software" pep->ep_state will be EP_HALTED. Driver only synchronizes pep->ep_state with this included in pep->out_ctx.
For SSP the state in pep->out_ctx - "hardware" endpoint state in this please will be in EP_STATE_HALTED, and "software" pep->ep_state will be EP_HALTED. For SSP driver will call cdnsp_halt_endpoint in which it changes the "hardware" and "software" endpoint state to EP_STOPPED/EP_STATE_STOPPED.
So for SSP the extra code: pep->ep_state &= ~EP_HALTED; pep->ep_state |= EP_STOPPED; will not change anything
Pawel
Peter
}
/* diff --git a/drivers/usb/cdns3/cdnsp-gadget.h b/drivers/usb/cdns3/cdnsp-gadget.h index 2afa3e558f85..a91cca509db0 100644 --- a/drivers/usb/cdns3/cdnsp-gadget.h +++ b/drivers/usb/cdns3/cdnsp-gadget.h @@ -987,6 +987,12 @@ enum cdnsp_setup_dev { #define STREAM_ID_FOR_TRB(p) ((((p)) << 16) & GENMASK(31,
16))
#define SCT_FOR_TRB(p) (((p) << 1) & 0x7)
+/*
- Halt Endpoint Command TRB field.
- The ESP bit only exists in the SSP2 controller.
- */
+#define TRB_ESP BIT(9)
/* Link TRB specific fields. */ #define TRB_TC BIT(1)
diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c index fd06cb85c4ea..d397d28efc6e 100644 --- a/drivers/usb/cdns3/cdnsp-ring.c +++ b/drivers/usb/cdns3/cdnsp-ring.c @@ -2483,7 +2483,8 @@ void cdnsp_queue_halt_endpoint(struct cdnsp_device *pdev, unsigned int ep_index) { cdnsp_queue_command(pdev, 0, 0, 0, TRB_TYPE(TRB_HALT_ENDPOINT)
|
SLOT_ID_FOR_TRB(pdev->slot_id) |
EP_ID_FOR_TRB(ep_index));
EP_ID_FOR_TRB(ep_index) |(!ep_index ? TRB_ESP : 0));}
void cdnsp_force_header_wakeup(struct cdnsp_device *pdev, int intf_num) -- 2.43.0
--
Best regards, Peter