diff options
| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2021-04-23 01:51:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-23 13:05:15 +0200 |
| commit | ddae7979cdd5ed417f2b3ebdc5742e2a600b5ad5 (patch) | |
| tree | aec4afb10c70e365205774de379da46f4ff05840 /drivers/usb | |
| parent | usb: dwc3: Capture new capability register GHWPARAMS9 (diff) | |
| download | linux-ddae7979cdd5ed417f2b3ebdc5742e2a600b5ad5.tar.xz linux-ddae7979cdd5ed417f2b3ebdc5742e2a600b5ad5.zip | |
usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability
DWC_usb32 IP introduces a new behavior when handling NoStream event for
IN endpoints. If the controller is capable of DEV_TXF_FLUSH_BYPASS, then
the driver does not need to force to restart stream for IN endpoints.
The controller will generate ERDY and restart the stream periodically.
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/65c3070c666cd6b8beeee62d7f8e3e704ebf2d32.1619134559.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc3/core.h | 3 | ||||
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 10 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index b678200cc51e..b1e875c58f20 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -379,6 +379,9 @@ #define DWC3_GHWPARAMS7_RAM1_DEPTH(n) ((n) & 0xffff) #define DWC3_GHWPARAMS7_RAM2_DEPTH(n) (((n) >> 16) & 0xffff) +/* Global HWPARAMS9 Register */ +#define DWC3_GHWPARAMS9_DEV_TXF_FLUSH_BYPASS BIT(0) + /* Global Frame Length Adjustment Register */ #define DWC3_GFLADJ_30MHZ_SDBND_SEL BIT(7) #define DWC3_GFLADJ_30MHZ_MASK 0x3f diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 90f4f9e69b22..dd80e5ca8c78 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -730,8 +730,16 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action) * All stream eps will reinitiate stream on NoStream * rejection until we can determine that the host can * prime after the first transfer. + * + * However, if the controller is capable of + * TXF_FLUSH_BYPASS, then IN direction endpoints will + * automatically restart the stream without the driver + * initiation. */ - dep->flags |= DWC3_EP_FORCE_RESTART_STREAM; + if (!dep->direction || + !(dwc->hwparams.hwparams9 & + DWC3_GHWPARAMS9_DEV_TXF_FLUSH_BYPASS)) + dep->flags |= DWC3_EP_FORCE_RESTART_STREAM; } } |