[PATCH 0/2] usb: dwc3: gadget: Check new capability

[PATCH 0/2] usb: dwc3: gadget: Check new capability

[Thinh Nguyen]

Capture a new capability register for DWC_usb32 and handle
DEV_TXF_FLUSH_BYPASS.



Thinh Nguyen (2):
  usb: dwc3: Capture new capability register GHWPARAMS9
  usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability

 drivers/usb/dwc3/core.c   |  3 +++
 drivers/usb/dwc3/core.h   |  5 +++++
 drivers/usb/dwc3/gadget.c | 10 +++++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)


base-commit: 3343f376d4bae98ec11fd104e0e211b275e754b8
-- 
2.28.0

[PATCH 1/2] usb: dwc3: Capture new capability register GHWPARAMS9

[Thinh Nguyen]

DWC_usb32 introduces a new HW capability register GHWPARAMS9. Capture
this in the dwc->hwparams.hwparams9 field.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
---
 drivers/usb/dwc3/core.c | 3 +++
 drivers/usb/dwc3/core.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 2f118ad43571..b6e53d8212cd 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -570,6 +570,9 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
 	parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
 	parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
 	parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
+
+	if (DWC3_IP_IS(DWC32))
+		parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9);
 }
 
 static int dwc3_core_ulpi_init(struct dwc3 *dwc)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 7e3afa5378e8..b678200cc51e 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -143,6 +143,7 @@
 #define DWC3_GHWPARAMS8		0xc600
 #define DWC3_GUCTL3		0xc60c
 #define DWC3_GFLADJ		0xc630
+#define DWC3_GHWPARAMS9		0xc680
 
 /* Device Registers */
 #define DWC3_DCFG		0xc700
@@ -857,6 +858,7 @@ struct dwc3_hwparams {
 	u32	hwparams6;
 	u32	hwparams7;
 	u32	hwparams8;
+	u32	hwparams9;
 };
 
 /* HWPARAMS0 */
-- 
2.28.0

[PATCH 2/2] usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability

[Thinh Nguyen]

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.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
---
 drivers/usb/dwc3/core.h   |  3 +++
 drivers/usb/dwc3/gadget.c | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

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;
 		}
 	}
 
-- 
2.28.0

Re: [PATCH 1/2] usb: dwc3: Capture new capability register GHWPARAMS9

[Felipe Balbi]

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Hi,

Thinh Nguyen <Thinh.Nguyen@synopsys.com> writes:

> DWC_usb32 introduces a new HW capability register GHWPARAMS9. Capture
> this in the dwc->hwparams.hwparams9 field.
>
> Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

Acked-by: Felipe Balbi <balbi@kernel.org>

-- 
balbi

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Re: [PATCH 2/2] usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability

[Felipe Balbi]

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Thinh Nguyen <Thinh.Nguyen@synopsys.com> writes:

> 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.
>
> Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

so we still need to force restart for RX? Just making sure. Other than
that:

Acked-by: Felipe Balbi <balbi@kernel.org>

-- 
balbi

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Re: [PATCH 2/2] usb: dwc3: gadget: Handle DEV_TXF_FLUSH_BYPASS capability

[Thinh Nguyen]

Felipe Balbi wrote:
> Thinh Nguyen <Thinh.Nguyen@synopsys.com> writes:
> 
>> 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.
>>
>> Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
> 
> so we still need to force restart for RX? Just making sure. Other than
> that:
> 
> Acked-by: Felipe Balbi <balbi@kernel.org>
> 

Yes, it's only for Tx. Same behavior remains for Rx. We have some
updates to simplify our design handling Tx direction.

Thanks,
Thinh