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usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability

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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>
This commit is contained in:
Thinh Nguyen 2021-04-22 16:51:43 -07:00 committed by Greg Kroah-Hartman
parent 16710380d3
commit ddae7979cd
2 changed files with 12 additions and 1 deletions
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3
drivers/usb/dwc3/core.h
View File

@ -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

10
drivers/usb/dwc3/gadget.c
View File

@ -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;
}
}