Hi Peter,
>
>On 21-03-22 07:09:02, Pawel Laszczak wrote:
>> From: Pawel Laszczak <paw...@cadence.com>
>>
>> Patch adds flag EP_UNCONFIGURED to detect whether endpoint was
>> unconfigured. This flag is set in cdnsp_reset_device after Reset Device
>> command. Among others this command disables all non control endpoints.
>> Flag is used in cdnsp_gadget_ep_disable to protect controller against
>> invoking Configure Endpoint command on disabled endpoint. Lack of this
>> protection in some cases caused that Configure Endpoint command completed
>> with Context State Error code completion.
>>
>> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD
>> Driver")
>> Signed-off-by: Pawel Laszczak <paw...@cadence.com>
>> ---
>> drivers/usb/cdns3/cdnsp-gadget.c | 18 +++++++++++++-----
>> drivers/usb/cdns3/cdnsp-gadget.h | 11 ++++++-----
>> 2 files changed, 19 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/usb/cdns3/cdnsp-gadget.c
>> b/drivers/usb/cdns3/cdnsp-gadget.c
>> index d7d4bdd57f46..de17cc4ad91a 100644
>> --- a/drivers/usb/cdns3/cdnsp-gadget.c
>> +++ b/drivers/usb/cdns3/cdnsp-gadget.c
>> @@ -727,7 +727,7 @@ int cdnsp_reset_device(struct cdnsp_device *pdev)
>> * are in Disabled state.
>> */
>> for (i = 1; i < CDNSP_ENDPOINTS_NUM; ++i)
>> - pdev->eps[i].ep_state |= EP_STOPPED;
>> + pdev->eps[i].ep_state |= EP_STOPPED | EP_UNCONFIGURED;
>>
>> trace_cdnsp_handle_cmd_reset_dev(slot_ctx);
>>
>> @@ -942,6 +942,7 @@ static int cdnsp_gadget_ep_enable(struct usb_ep *ep,
>>
>> pep = to_cdnsp_ep(ep);
>> pdev = pep->pdev;
>> + pep->ep_state &= ~EP_UNCONFIGURED;
>>
>> if (dev_WARN_ONCE(pdev->dev, pep->ep_state & EP_ENABLED,
>> "%s is already enabled\n", pep->name))
>> @@ -1023,9 +1024,13 @@ static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
>> goto finish;
>> }
>>
>> - cdnsp_cmd_stop_ep(pdev, pep);
>> pep->ep_state |= EP_DIS_IN_RROGRESS;
>> - cdnsp_cmd_flush_ep(pdev, pep);
>> +
>> + /* Endpoint was unconfigured by Reset Device command. */
>> + if (!(pep->ep_state & EP_UNCONFIGURED)) {
>> + cdnsp_cmd_stop_ep(pdev, pep);
>> + cdnsp_cmd_flush_ep(pdev, pep);
>> + }
>>
>> /* Remove all queued USB requests. */
>> while (!list_empty(&pep->pending_list)) {
>> @@ -1036,6 +1041,7 @@ static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
>> cdnsp_invalidate_ep_events(pdev, pep);
>>
>> pep->ep_state &= ~EP_DIS_IN_RROGRESS;
>> +
>
>Useless blank line
>
>> drop_flag = cdnsp_get_endpoint_flag(pep->endpoint.desc);
>> ctrl_ctx = cdnsp_get_input_control_ctx(&pdev->in_ctx);
>> ctrl_ctx->drop_flags = cpu_to_le32(drop_flag);
>> @@ -1043,10 +1049,12 @@ static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
>>
>> cdnsp_endpoint_zero(pdev, pep);
>>
>> - ret = cdnsp_update_eps_configuration(pdev, pep);
>> + if (!(pep->ep_state & EP_UNCONFIGURED))
>> + ret = cdnsp_update_eps_configuration(pdev, pep);
>> +
>> cdnsp_free_endpoint_rings(pdev, pep);
>>
>> - pep->ep_state &= ~EP_ENABLED;
>> + pep->ep_state &= ~(EP_ENABLED | EP_UNCONFIGURED);
>> pep->ep_state |= EP_STOPPED;
>>
>> finish:
>> diff --git a/drivers/usb/cdns3/cdnsp-gadget.h
>> b/drivers/usb/cdns3/cdnsp-gadget.h
>> index 6bbb26548c04..e628bd539e23 100644
>> --- a/drivers/usb/cdns3/cdnsp-gadget.h
>> +++ b/drivers/usb/cdns3/cdnsp-gadget.h
>> @@ -830,11 +830,12 @@ struct cdnsp_ep {
>> unsigned int ep_state;
>> #define EP_ENABLED BIT(0)
>> #define EP_DIS_IN_RROGRESS BIT(1)
>> -#define EP_HALTED BIT(2)
>> -#define EP_STOPPED BIT(3)
>> -#define EP_WEDGE BIT(4)
>> -#define EP0_HALTED_STATUS BIT(5)
>> -#define EP_HAS_STREAMS BIT(6)
>> +#define EP_UNCONFIGURED BIT(2)
>
>Why add new flag as BIT(2), it causes many changes in this patch?
In my feeling, EP_UNCONFIGURED is more associates with the first 2 flags, so
I've decided
put it after BIT(1).
>
>> +#define EP_HALTED BIT(3)
>> +#define EP_STOPPED BIT(4)
>> +#define EP_WEDGE BIT(5)
>> +#define EP0_HALTED_STATUS BIT(6)
>> +#define EP_HAS_STREAMS BIT(7)
>>
>> bool skip;
>> };
>> --
>> 2.25.1
>>
>
>--
>
>Thanks,
>Peter Chen
