[PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Stanley Chang]

In Synopsys's dwc3 data book:
To avoid underrun and overrun during the burst, in a high-latency bus
system (like USB), threshold and burst size control is provided through
GTXTHRCFG and GRXTHRCFG registers.

In Realtek DHC SoC, DWC3 USB 3.0 uses AHB system bus. When dwc3 is
connected with USB 2.5G Ethernet, there will be overrun problem.
Therefore, setting TX/RX thresholds can avoid this issue.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
---
v1 to v2 change:
    Add the properties for TX/RX threshold setting
---
 drivers/usb/dwc3/core.c | 51 +++++++++++++++++++++++++++++++++++++++++
 drivers/usb/dwc3/core.h | 13 +++++++++++
 2 files changed, 64 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9c6bf054f15d..1f74a53816c3 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
 		}
 	}
 
+	if (DWC3_IP_IS(DWC3)) {
+		u8 rx_thr_num = dwc->rx_thr_num_pkt;
+		u8 rx_maxburst = dwc->rx_max_burst;
+		u8 tx_thr_num = dwc->tx_thr_num_pkt;
+		u8 tx_maxburst = dwc->tx_max_burst;
+
+		if (rx_thr_num && rx_maxburst) {
+			reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
+			reg |= DWC3_GRXTHRCFG_PKTCNTSEL;
+
+			reg &= ~DWC3_GRXTHRCFG_RXPKTCNT(~0);
+			reg |= DWC3_GRXTHRCFG_RXPKTCNT(rx_thr_num);
+
+			reg &= ~DWC3_GRXTHRCFG_MAXRXBURSTSIZE(~0);
+			reg |= DWC3_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst);
+
+			dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
+		}
+
+		if (tx_thr_num && tx_maxburst) {
+			reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
+			reg |= DWC3_GTXTHRCFG_PKTCNTSEL;
+
+			reg &= ~DWC3_GTXTHRCFG_TXPKTCNT(~0);
+			reg |= DWC3_GTXTHRCFG_TXPKTCNT(tx_thr_num);
+
+			reg &= ~DWC3_GTXTHRCFG_MAXTXBURSTSIZE(~0);
+			reg |= DWC3_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst);
+
+			dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
+		}
+	}
+
 	return 0;
 
 err_power_off_phy:
@@ -1380,6 +1413,10 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	u8			lpm_nyet_threshold;
 	u8			tx_de_emphasis;
 	u8			hird_threshold;
+	u8			rx_thr_num_pkt = 0;
+	u8			rx_max_burst = 0;
+	u8			tx_thr_num_pkt = 0;
+	u8			tx_max_burst = 0;
 	u8			rx_thr_num_pkt_prd = 0;
 	u8			rx_max_burst_prd = 0;
 	u8			tx_thr_num_pkt_prd = 0;
@@ -1442,6 +1479,14 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 				"snps,usb2-lpm-disable");
 	dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
 				"snps,usb2-gadget-lpm-disable");
+	device_property_read_u8(dev, "snps,rx-thr-num-pkt",
+				&rx_thr_num_pkt);
+	device_property_read_u8(dev, "snps,rx-max-burst",
+				&rx_max_burst);
+	device_property_read_u8(dev, "snps,tx-thr-num-pkt",
+				&tx_thr_num_pkt);
+	device_property_read_u8(dev, "snps,tx-max-burst",
+				&tx_max_burst);
 	device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
 				&rx_thr_num_pkt_prd);
 	device_property_read_u8(dev, "snps,rx-max-burst-prd",
@@ -1523,6 +1568,12 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 
 	dwc->hird_threshold = hird_threshold;
 
+	dwc->rx_thr_num_pkt = rx_thr_num_pkt;
+	dwc->rx_max_burst = rx_max_burst;
+
+	dwc->tx_thr_num_pkt = tx_thr_num_pkt;
+	dwc->tx_max_burst = tx_max_burst;
+
 	dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
 	dwc->rx_max_burst_prd = rx_max_burst_prd;
 
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index a69ac67d89fe..6782ec8bfd64 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -211,6 +211,11 @@
 #define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)
 #define DWC3_GRXTHRCFG_PKTCNTSEL BIT(29)
 
+/* Global TX Threshold Configuration Register */
+#define DWC3_GTXTHRCFG_MAXTXBURSTSIZE(n) (((n) & 0xff) << 16)
+#define DWC3_GTXTHRCFG_TXPKTCNT(n) (((n) & 0xf) << 24)
+#define DWC3_GTXTHRCFG_PKTCNTSEL BIT(29)
+
 /* Global RX Threshold Configuration Register for DWC_usb31 only */
 #define DWC31_GRXTHRCFG_MAXRXBURSTSIZE(n)	(((n) & 0x1f) << 16)
 #define DWC31_GRXTHRCFG_RXPKTCNT(n)		(((n) & 0x1f) << 21)
@@ -1045,6 +1050,10 @@ struct dwc3_scratchpad_array {
  * @test_mode_nr: test feature selector
  * @lpm_nyet_threshold: LPM NYET response threshold
  * @hird_threshold: HIRD threshold
+ * @rx_thr_num_pkt: USB receive packet count
+ * @rx_max_burst: max USB receive burst size
+ * @tx_thr_num_pkt: USB transmit packet count
+ * @tx_max_burst: max USB transmit burst size
  * @rx_thr_num_pkt_prd: periodic ESS receive packet count
  * @rx_max_burst_prd: max periodic ESS receive burst size
  * @tx_thr_num_pkt_prd: periodic ESS transmit packet count
@@ -1273,6 +1282,10 @@ struct dwc3 {
 	u8			test_mode_nr;
 	u8			lpm_nyet_threshold;
 	u8			hird_threshold;
+	u8			rx_thr_num_pkt;
+	u8			rx_max_burst;
+	u8			tx_thr_num_pkt;
+	u8			tx_max_burst;
 	u8			rx_thr_num_pkt_prd;
 	u8			rx_max_burst_prd;
 	u8			tx_thr_num_pkt_prd;
-- 
2.34.1

[PATCH v2 RESEND 2/2] dt-bindings: usb: dwc3: Add DWC_usb3 TX/RX threshold configurable

[Stanley Chang]

In Synopsys's dwc3 data book:
To avoid underrun and overrun during the burst, in a high-latency bus
system (like USB), threshold and burst size control is provided through
GTXTHRCFG and GRXTHRCFG registers.
By default, USB TX and RX threshold are not enabled. To enable
TX or RX threshold, both packet threshold count and max burst size
properties must be set to a valid non-zero value.

In Realtek DHC SoC, DWC3 USB 3.0 uses AHB system bus. When dwc3 is
connected with USB 2.5G Ethernet, there will be overrun problem.
Therefore, setting TX/RX thresholds can avoid this issue.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
---
v1 to v2 change:
    Add the properties for TX/RX threshold setting
---
 .../devicetree/bindings/usb/snps,dwc3.yaml    | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index a696f23730d3..ee5af4b381b1 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -310,6 +310,62 @@ properties:
     maximum: 62
     deprecated: true
 
+  snps,rx-thr-num-pkt:
+    description:
+      USB RX packet threshold count. In host mode, this field specifies
+      the space that must be available in the RX FIFO before the core can
+      start the corresponding USB RX transaction (burst).
+      In device mode, this field specifies the space that must be
+      available in the RX FIFO before the core can send ERDY for a
+      flow-controlled endpoint. It is only used for SuperSpeed.
+      The valid values for this field are from 1 to 15. (DWC3 SuperSpeed
+      USB 3.0 Controller Databook)
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 15
+
+  snps,rx-max-burst:
+    description:
+      Max USB RX burst size. In host mode, this field specifies the
+      Maximum Bulk IN burst the DWC_usb3 core can perform. When the system
+      bus is slower than the USB, RX FIFO can overrun during a long burst.
+      You can program a smaller value to this field to limit the RX burst
+      size that the core can perform. It only applies to SS Bulk,
+      Isochronous, and Interrupt IN endpoints in the host mode.
+      In device mode, this field specifies the NUMP value that is sent in
+      ERDY for an OUT endpoint.
+      The valid values for this field are from 1 to 16. (DWC3 SuperSpeed
+      USB 3.0 Controller Databook)
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 16
+
+  snps,tx-thr-num-pkt:
+    description:
+      USB TX packet threshold count. This field specifies the number of
+      packets that must be in the TXFIFO before the core can start
+      transmission for the corresponding USB transaction (burst).
+      This count is valid in both host and device modes. It is only used
+      for SuperSpeed operation.
+      Valid values are from 1 to 15. (DWC3 SuperSpeed USB 3.0 Controller
+      Databook)
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 15
+
+  snps,tx-max-burst:
+    description:
+      Max USB TX burst size. When the system bus is slower than the USB,
+      TX FIFO can underrun during a long burst. Program a smaller value
+      to this field to limit the TX burst size that the core can execute.
+      In Host mode, it only applies to SS Bulk, Isochronous, and Interrupt
+      OUT endpoints. This value is not used in device mode.
+      Valid values are from 1 to 16. (DWC3 SuperSpeed USB 3.0 Controller
+      Databook)
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 16
+
   snps,rx-thr-num-pkt-prd:
     description:
       Periodic ESS RX packet threshold count (host mode only). Set this and
-- 
2.34.1

Re: [PATCH v2 RESEND 2/2] dt-bindings: usb: dwc3: Add DWC_usb3 TX/RX threshold configurable

[Rob Herring]

On Mon, 28 Aug 2023 13:52:06 +0800, Stanley Chang wrote:
> In Synopsys's dwc3 data book:
> To avoid underrun and overrun during the burst, in a high-latency bus
> system (like USB), threshold and burst size control is provided through
> GTXTHRCFG and GRXTHRCFG registers.
> By default, USB TX and RX threshold are not enabled. To enable
> TX or RX threshold, both packet threshold count and max burst size
> properties must be set to a valid non-zero value.
> 
> In Realtek DHC SoC, DWC3 USB 3.0 uses AHB system bus. When dwc3 is
> connected with USB 2.5G Ethernet, there will be overrun problem.
> Therefore, setting TX/RX thresholds can avoid this issue.
> 
> Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
> ---
> v1 to v2 change:
>     Add the properties for TX/RX threshold setting
> ---
>  .../devicetree/bindings/usb/snps,dwc3.yaml    | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

RE: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Stanley Chang[昌育德]]

Hi Thinh,

Can you help review this patch?

Thanks,
Stanley

> -----Original Message-----
> From: Stanley Chang <stanley_chang@realtek.com>
> Sent: Monday, August 28, 2023 1:52 PM
> To: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
> Cc: Stanley Chang[昌育德] <stanley_chang@realtek.com>; Greg
> Kroah-Hartman <gregkh@linuxfoundation.org>; Rob Herring
> <robh+dt@kernel.org>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@linaro.org>; Conor Dooley <conor+dt@kernel.org>;
> Felipe Balbi <balbi@kernel.org>; linux-usb@vger.kernel.org;
> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for
> DWC3_IP
> 
> In Synopsys's dwc3 data book:
> To avoid underrun and overrun during the burst, in a high-latency bus system
> (like USB), threshold and burst size control is provided through GTXTHRCFG and
> GRXTHRCFG registers.
> 
> In Realtek DHC SoC, DWC3 USB 3.0 uses AHB system bus. When dwc3 is
> connected with USB 2.5G Ethernet, there will be overrun problem.
> Therefore, setting TX/RX thresholds can avoid this issue.
> 
> Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
> ---
> v1 to v2 change:
>     Add the properties for TX/RX threshold setting
> ---
>  drivers/usb/dwc3/core.c | 51
> +++++++++++++++++++++++++++++++++++++++++
>  drivers/usb/dwc3/core.h | 13 +++++++++++
>  2 files changed, 64 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index
> 9c6bf054f15d..1f74a53816c3 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  		}
>  	}
> 
> +	if (DWC3_IP_IS(DWC3)) {
> +		u8 rx_thr_num = dwc->rx_thr_num_pkt;
> +		u8 rx_maxburst = dwc->rx_max_burst;
> +		u8 tx_thr_num = dwc->tx_thr_num_pkt;
> +		u8 tx_maxburst = dwc->tx_max_burst;
> +
> +		if (rx_thr_num && rx_maxburst) {
> +			reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
> +			reg |= DWC3_GRXTHRCFG_PKTCNTSEL;
> +
> +			reg &= ~DWC3_GRXTHRCFG_RXPKTCNT(~0);
> +			reg |= DWC3_GRXTHRCFG_RXPKTCNT(rx_thr_num);
> +
> +			reg &= ~DWC3_GRXTHRCFG_MAXRXBURSTSIZE(~0);
> +			reg |= DWC3_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst);
> +
> +			dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
> +		}
> +
> +		if (tx_thr_num && tx_maxburst) {
> +			reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
> +			reg |= DWC3_GTXTHRCFG_PKTCNTSEL;
> +
> +			reg &= ~DWC3_GTXTHRCFG_TXPKTCNT(~0);
> +			reg |= DWC3_GTXTHRCFG_TXPKTCNT(tx_thr_num);
> +
> +			reg &= ~DWC3_GTXTHRCFG_MAXTXBURSTSIZE(~0);
> +			reg |= DWC3_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst);
> +
> +			dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
> +		}
> +	}
> +
>  	return 0;
> 
>  err_power_off_phy:
> @@ -1380,6 +1413,10 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  	u8			lpm_nyet_threshold;
>  	u8			tx_de_emphasis;
>  	u8			hird_threshold;
> +	u8			rx_thr_num_pkt = 0;
> +	u8			rx_max_burst = 0;
> +	u8			tx_thr_num_pkt = 0;
> +	u8			tx_max_burst = 0;
>  	u8			rx_thr_num_pkt_prd = 0;
>  	u8			rx_max_burst_prd = 0;
>  	u8			tx_thr_num_pkt_prd = 0;
> @@ -1442,6 +1479,14 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  				"snps,usb2-lpm-disable");
>  	dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
>  				"snps,usb2-gadget-lpm-disable");
> +	device_property_read_u8(dev, "snps,rx-thr-num-pkt",
> +				&rx_thr_num_pkt);
> +	device_property_read_u8(dev, "snps,rx-max-burst",
> +				&rx_max_burst);
> +	device_property_read_u8(dev, "snps,tx-thr-num-pkt",
> +				&tx_thr_num_pkt);
> +	device_property_read_u8(dev, "snps,tx-max-burst",
> +				&tx_max_burst);
>  	device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
>  				&rx_thr_num_pkt_prd);
>  	device_property_read_u8(dev, "snps,rx-max-burst-prd", @@ -1523,6
> +1568,12 @@ static void dwc3_get_properties(struct dwc3 *dwc)
> 
>  	dwc->hird_threshold = hird_threshold;
> 
> +	dwc->rx_thr_num_pkt = rx_thr_num_pkt;
> +	dwc->rx_max_burst = rx_max_burst;
> +
> +	dwc->tx_thr_num_pkt = tx_thr_num_pkt;
> +	dwc->tx_max_burst = tx_max_burst;
> +
>  	dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
>  	dwc->rx_max_burst_prd = rx_max_burst_prd;
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index
> a69ac67d89fe..6782ec8bfd64 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -211,6 +211,11 @@
>  #define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)  #define
> DWC3_GRXTHRCFG_PKTCNTSEL BIT(29)
> 
> +/* Global TX Threshold Configuration Register */ #define
> +DWC3_GTXTHRCFG_MAXTXBURSTSIZE(n) (((n) & 0xff) << 16) #define
> +DWC3_GTXTHRCFG_TXPKTCNT(n) (((n) & 0xf) << 24) #define
> +DWC3_GTXTHRCFG_PKTCNTSEL BIT(29)
> +
>  /* Global RX Threshold Configuration Register for DWC_usb31 only */
>  #define DWC31_GRXTHRCFG_MAXRXBURSTSIZE(n)	(((n) & 0x1f) << 16)
>  #define DWC31_GRXTHRCFG_RXPKTCNT(n)		(((n) & 0x1f) << 21)
> @@ -1045,6 +1050,10 @@ struct dwc3_scratchpad_array {
>   * @test_mode_nr: test feature selector
>   * @lpm_nyet_threshold: LPM NYET response threshold
>   * @hird_threshold: HIRD threshold
> + * @rx_thr_num_pkt: USB receive packet count
> + * @rx_max_burst: max USB receive burst size
> + * @tx_thr_num_pkt: USB transmit packet count
> + * @tx_max_burst: max USB transmit burst size
>   * @rx_thr_num_pkt_prd: periodic ESS receive packet count
>   * @rx_max_burst_prd: max periodic ESS receive burst size
>   * @tx_thr_num_pkt_prd: periodic ESS transmit packet count @@ -1273,6
> +1282,10 @@ struct dwc3 {
>  	u8			test_mode_nr;
>  	u8			lpm_nyet_threshold;
>  	u8			hird_threshold;
> +	u8			rx_thr_num_pkt;
> +	u8			rx_max_burst;
> +	u8			tx_thr_num_pkt;
> +	u8			tx_max_burst;
>  	u8			rx_thr_num_pkt_prd;
>  	u8			rx_max_burst_prd;
>  	u8			tx_thr_num_pkt_prd;
> --
> 2.34.1

Re: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Thinh Nguyen]

Hi Stanley,

Sorry for the delay response.

On Mon, Aug 28, 2023, Stanley Chang wrote:
> In Synopsys's dwc3 data book:
> To avoid underrun and overrun during the burst, in a high-latency bus
> system (like USB), threshold and burst size control is provided through
> GTXTHRCFG and GRXTHRCFG registers.
> 
> In Realtek DHC SoC, DWC3 USB 3.0 uses AHB system bus. When dwc3 is
> connected with USB 2.5G Ethernet, there will be overrun problem.
> Therefore, setting TX/RX thresholds can avoid this issue.
> 
> Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
> ---
> v1 to v2 change:
>     Add the properties for TX/RX threshold setting
> ---
>  drivers/usb/dwc3/core.c | 51 +++++++++++++++++++++++++++++++++++++++++
>  drivers/usb/dwc3/core.h | 13 +++++++++++
>  2 files changed, 64 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 9c6bf054f15d..1f74a53816c3 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  		}
>  	}
>  
> +	if (DWC3_IP_IS(DWC3)) {

Would you mind also add the checks for DWC_usb31 and DWC_usb32? Both the
DWC_usb31 and DWC_usb32 share the same field offsets within GTX/RXTHRCFG
registers. The macros are already defined for those IPs.

Also, I think this new addition will make dwc3_core_init() lengthy. Can
we split this logic to a separate function, perhaps
dwc3_config_threshold()?

Thanks!
Thinh

> +		u8 rx_thr_num = dwc->rx_thr_num_pkt;
> +		u8 rx_maxburst = dwc->rx_max_burst;
> +		u8 tx_thr_num = dwc->tx_thr_num_pkt;
> +		u8 tx_maxburst = dwc->tx_max_burst;
> +
> +		if (rx_thr_num && rx_maxburst) {
> +			reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
> +			reg |= DWC3_GRXTHRCFG_PKTCNTSEL;
> +
> +			reg &= ~DWC3_GRXTHRCFG_RXPKTCNT(~0);
> +			reg |= DWC3_GRXTHRCFG_RXPKTCNT(rx_thr_num);
> +
> +			reg &= ~DWC3_GRXTHRCFG_MAXRXBURSTSIZE(~0);
> +			reg |= DWC3_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst);
> +
> +			dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
> +		}
> +
> +		if (tx_thr_num && tx_maxburst) {
> +			reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
> +			reg |= DWC3_GTXTHRCFG_PKTCNTSEL;
> +
> +			reg &= ~DWC3_GTXTHRCFG_TXPKTCNT(~0);
> +			reg |= DWC3_GTXTHRCFG_TXPKTCNT(tx_thr_num);
> +
> +			reg &= ~DWC3_GTXTHRCFG_MAXTXBURSTSIZE(~0);
> +			reg |= DWC3_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst);
> +
> +			dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
> +		}
> +	}
> +
>  	return 0;
>  
>  err_power_off_phy:
> @@ -1380,6 +1413,10 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  	u8			lpm_nyet_threshold;
>  	u8			tx_de_emphasis;
>  	u8			hird_threshold;
> +	u8			rx_thr_num_pkt = 0;
> +	u8			rx_max_burst = 0;
> +	u8			tx_thr_num_pkt = 0;
> +	u8			tx_max_burst = 0;
>  	u8			rx_thr_num_pkt_prd = 0;
>  	u8			rx_max_burst_prd = 0;
>  	u8			tx_thr_num_pkt_prd = 0;
> @@ -1442,6 +1479,14 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  				"snps,usb2-lpm-disable");
>  	dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
>  				"snps,usb2-gadget-lpm-disable");
> +	device_property_read_u8(dev, "snps,rx-thr-num-pkt",
> +				&rx_thr_num_pkt);
> +	device_property_read_u8(dev, "snps,rx-max-burst",
> +				&rx_max_burst);
> +	device_property_read_u8(dev, "snps,tx-thr-num-pkt",
> +				&tx_thr_num_pkt);
> +	device_property_read_u8(dev, "snps,tx-max-burst",
> +				&tx_max_burst);
>  	device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
>  				&rx_thr_num_pkt_prd);
>  	device_property_read_u8(dev, "snps,rx-max-burst-prd",
> @@ -1523,6 +1568,12 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  
>  	dwc->hird_threshold = hird_threshold;
>  
> +	dwc->rx_thr_num_pkt = rx_thr_num_pkt;
> +	dwc->rx_max_burst = rx_max_burst;
> +
> +	dwc->tx_thr_num_pkt = tx_thr_num_pkt;
> +	dwc->tx_max_burst = tx_max_burst;
> +
>  	dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
>  	dwc->rx_max_burst_prd = rx_max_burst_prd;
>  
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index a69ac67d89fe..6782ec8bfd64 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -211,6 +211,11 @@
>  #define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)
>  #define DWC3_GRXTHRCFG_PKTCNTSEL BIT(29)
>  
> +/* Global TX Threshold Configuration Register */
> +#define DWC3_GTXTHRCFG_MAXTXBURSTSIZE(n) (((n) & 0xff) << 16)
> +#define DWC3_GTXTHRCFG_TXPKTCNT(n) (((n) & 0xf) << 24)
> +#define DWC3_GTXTHRCFG_PKTCNTSEL BIT(29)
> +
>  /* Global RX Threshold Configuration Register for DWC_usb31 only */
>  #define DWC31_GRXTHRCFG_MAXRXBURSTSIZE(n)	(((n) & 0x1f) << 16)
>  #define DWC31_GRXTHRCFG_RXPKTCNT(n)		(((n) & 0x1f) << 21)
> @@ -1045,6 +1050,10 @@ struct dwc3_scratchpad_array {
>   * @test_mode_nr: test feature selector
>   * @lpm_nyet_threshold: LPM NYET response threshold
>   * @hird_threshold: HIRD threshold
> + * @rx_thr_num_pkt: USB receive packet count
> + * @rx_max_burst: max USB receive burst size
> + * @tx_thr_num_pkt: USB transmit packet count
> + * @tx_max_burst: max USB transmit burst size
>   * @rx_thr_num_pkt_prd: periodic ESS receive packet count
>   * @rx_max_burst_prd: max periodic ESS receive burst size
>   * @tx_thr_num_pkt_prd: periodic ESS transmit packet count
> @@ -1273,6 +1282,10 @@ struct dwc3 {
>  	u8			test_mode_nr;
>  	u8			lpm_nyet_threshold;
>  	u8			hird_threshold;
> +	u8			rx_thr_num_pkt;
> +	u8			rx_max_burst;
> +	u8			tx_thr_num_pkt;
> +	u8			tx_max_burst;
>  	u8			rx_thr_num_pkt_prd;
>  	u8			rx_max_burst_prd;
>  	u8			tx_thr_num_pkt_prd;
> -- 
> 2.34.1
> 

RE: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Stanley Chang[昌育德]]

Hi Thinh,

> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index
> > 9c6bf054f15d..1f74a53816c3 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
> >               }
> >       }
> >
> > +     if (DWC3_IP_IS(DWC3)) {
> 
> Would you mind also add the checks for DWC_usb31 and DWC_usb32? Both
> the
> DWC_usb31 and DWC_usb32 share the same field offsets within
> GTX/RXTHRCFG registers. The macros are already defined for those IPs.

DWC3 and DWC31, DWC32 seem to have different register definition as follows.
/* Global RX Threshold Configuration Register */
#define DWC3_GRXTHRCFG_MAXRXBURSTSIZE(n) (((n) & 0x1f) << 19)
#define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)
#define DWC3_GRXTHRCFG_PKTCNTSEL BIT(29)

/* Global TX Threshold Configuration Register */
#define DWC3_GTXTHRCFG_MAXTXBURSTSIZE(n) (((n) & 0xff) << 16)
#define DWC3_GTXTHRCFG_TXPKTCNT(n) (((n) & 0xf) << 24)
#define DWC3_GTXTHRCFG_PKTCNTSEL BIT(29)

/* Global RX Threshold Configuration Register for DWC_usb31 only */
#define DWC31_GRXTHRCFG_MAXRXBURSTSIZE(n)       (((n) & 0x1f) << 16)
#define DWC31_GRXTHRCFG_RXPKTCNT(n)             (((n) & 0x1f) << 21)
#define DWC31_GRXTHRCFG_PKTCNTSEL               BIT(26)
#define DWC31_RXTHRNUMPKTSEL_HS_PRD             BIT(15)
#define DWC31_RXTHRNUMPKT_HS_PRD(n)             (((n) & 0x3) << 13)
#define DWC31_RXTHRNUMPKTSEL_PRD                BIT(10)
#define DWC31_RXTHRNUMPKT_PRD(n)                (((n) & 0x1f) << 5)
#define DWC31_MAXRXBURSTSIZE_PRD(n)             ((n) & 0x1f)

/* Global TX Threshold Configuration Register for DWC_usb31 only */
#define DWC31_GTXTHRCFG_MAXTXBURSTSIZE(n)       (((n) & 0x1f) << 16)
#define DWC31_GTXTHRCFG_TXPKTCNT(n)             (((n) & 0x1f) << 21)
#define DWC31_GTXTHRCFG_PKTCNTSEL               BIT(26)
#define DWC31_TXTHRNUMPKTSEL_HS_PRD             BIT(15)
#define DWC31_TXTHRNUMPKT_HS_PRD(n)             (((n) & 0x3) << 13)
#define DWC31_TXTHRNUMPKTSEL_PRD                BIT(10)
#define DWC31_TXTHRNUMPKT_PRD(n)                (((n) & 0x1f) << 5)
#define DWC31_MAXTXBURSTSIZE_PRD(n)             ((n) & 0x1f)

> Also, I think this new addition will make dwc3_core_init() lengthy. Can we split
> this logic to a separate function, perhaps dwc3_config_threshold()?
> 

Ok, I will move this logic to a new function.
Thanks,
Stanley

Re: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Thinh Nguyen]

On Tue, Sep 12, 2023, Stanley Chang[昌育德] wrote:
> Hi Thinh,
> 
> > >
> > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index
> > > 9c6bf054f15d..1f74a53816c3 100644
> > > --- a/drivers/usb/dwc3/core.c
> > > +++ b/drivers/usb/dwc3/core.c
> > > @@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > >               }
> > >       }
> > >
> > > +     if (DWC3_IP_IS(DWC3)) {
> > 
> > Would you mind also add the checks for DWC_usb31 and DWC_usb32? Both
> > the
> > DWC_usb31 and DWC_usb32 share the same field offsets within
> > GTX/RXTHRCFG registers. The macros are already defined for those IPs.
> 
> DWC3 and DWC31, DWC32 seem to have different register definition as follows.

Yes. That's what I meant. They are already define in the core.h for
DWC_usb31. DWC_usb32 also shares the same offsets as DWC_usb31 for this.
Can you also include the setting of GTX/RXTHRCFG logic for those 2 IPs?

Thanks,
Thinh

RE: [PATCH v2 RESEND 1/2] usb: dwc3: core: configure TX/RX threshold for DWC3_IP

[Stanley Chang[昌育德]]

Hi Thinh,

> > > >
> > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > > > index
> > > > 9c6bf054f15d..1f74a53816c3 100644
> > > > --- a/drivers/usb/dwc3/core.c
> > > > +++ b/drivers/usb/dwc3/core.c
> > > > @@ -1246,6 +1246,39 @@ static int dwc3_core_init(struct dwc3 *dwc)
> > > >               }
> > > >       }
> > > >
> > > > +     if (DWC3_IP_IS(DWC3)) {
> > >
> > > Would you mind also add the checks for DWC_usb31 and DWC_usb32?
> Both
> > > the
> > > DWC_usb31 and DWC_usb32 share the same field offsets within
> > > GTX/RXTHRCFG registers. The macros are already defined for those IPs.
> >
> > DWC3 and DWC31, DWC32 seem to have different register definition as
> follows.
> 
> Yes. That's what I meant. They are already define in the core.h for DWC_usb31.
> DWC_usb32 also shares the same offsets as DWC_usb31 for this.
> Can you also include the setting of GTX/RXTHRCFG logic for those 2 IPs?
> 
I understand. I will add them.

Thanks,
Stanley