[PATCH net v4] net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX

[PATCH net v4] net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX

[Sneh Shah]

In 10M SGMII mode all the packets are being dropped due to wrong Rx clock.
SGMII 10MBPS mode needs RX clock divider programmed to avoid drops in Rx.
Update configure SGMII function with Rx clk divider programming.

Fixes: 463120c31c58 ("net: stmmac: dwmac-qcom-ethqos: add support for SGMII")
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Sneh Shah <quic_snehshah@quicinc.com>
---
v4 changelog:
- Updated commit message to add more details on why 10M SGMII Rx is failing
- Added a macro for Rx clock divider value
v3 changelog:
- Added comment to explain why MAC needs to be reconfigured for SGMII
v2 changelog:
- Use FIELD_PREP to prepare bifield values in place of GENMASK
- Add fixes tag
---
 .../net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c    | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index d3bf42d0fceb..31631e3f89d0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -34,6 +34,7 @@
 #define RGMII_CONFIG_LOOPBACK_EN		BIT(2)
 #define RGMII_CONFIG_PROG_SWAP			BIT(1)
 #define RGMII_CONFIG_DDR_MODE			BIT(0)
+#define RGMII_CONFIG_SGMII_CLK_DVDR		GENMASK(18, 10)
 
 /* SDCC_HC_REG_DLL_CONFIG fields */
 #define SDCC_DLL_CONFIG_DLL_RST			BIT(30)
@@ -78,6 +79,8 @@
 #define ETHQOS_MAC_CTRL_SPEED_MODE		BIT(14)
 #define ETHQOS_MAC_CTRL_PORT_SEL		BIT(15)
 
+#define SGMII_10M_RX_CLK_DVDR			0x31
+
 struct ethqos_emac_por {
 	unsigned int offset;
 	unsigned int value;
@@ -598,6 +601,9 @@ static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
 	return 0;
 }
 
+/* On interface toggle MAC registers gets reset.
+ * Configure MAC block for SGMII on ethernet phy link up
+ */
 static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
 {
 	int val;
@@ -617,6 +623,10 @@ static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
 	case SPEED_10:
 		val |= ETHQOS_MAC_CTRL_PORT_SEL;
 		val &= ~ETHQOS_MAC_CTRL_SPEED_MODE;
+		rgmii_updatel(ethqos, RGMII_CONFIG_SGMII_CLK_DVDR,
+			      FIELD_PREP(RGMII_CONFIG_SGMII_CLK_DVDR,
+					 SGMII_10M_RX_CLK_DVDR),
+			      RGMII_IO_MACRO_CONFIG);
 		break;
 	}
 
-- 
2.17.1


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Re: [PATCH net v4] net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX

[Bjorn Andersson]

On Tue, Dec 12, 2023 at 02:52:08PM +0530, Sneh Shah wrote:
> In 10M SGMII mode all the packets are being dropped due to wrong Rx clock.
> SGMII 10MBPS mode needs RX clock divider programmed to avoid drops in Rx.
> Update configure SGMII function with Rx clk divider programming.
> 

Thanks you for the updates!

Reviewed-by: Bjorn Andersson <quic_bjorande@quicinc.com>

> Fixes: 463120c31c58 ("net: stmmac: dwmac-qcom-ethqos: add support for SGMII")
> Tested-by: Andrew Halaney <ahalaney@redhat.com>
> Signed-off-by: Sneh Shah <quic_snehshah@quicinc.com>
> ---
> v4 changelog:
> - Updated commit message to add more details on why 10M SGMII Rx is failing
> - Added a macro for Rx clock divider value
> v3 changelog:
> - Added comment to explain why MAC needs to be reconfigured for SGMII
> v2 changelog:
> - Use FIELD_PREP to prepare bifield values in place of GENMASK
> - Add fixes tag
> ---
>  .../net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c    | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index d3bf42d0fceb..31631e3f89d0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -34,6 +34,7 @@
>  #define RGMII_CONFIG_LOOPBACK_EN		BIT(2)
>  #define RGMII_CONFIG_PROG_SWAP			BIT(1)
>  #define RGMII_CONFIG_DDR_MODE			BIT(0)
> +#define RGMII_CONFIG_SGMII_CLK_DVDR		GENMASK(18, 10)

Thank you for the clarification of rgmii vs sgmii. Perhaps this could be
made clearer by renaming the rgmii ones as well? In a separate patch
series, of course.

Regards,
Bjorn

>  
>  /* SDCC_HC_REG_DLL_CONFIG fields */
>  #define SDCC_DLL_CONFIG_DLL_RST			BIT(30)
> @@ -78,6 +79,8 @@
>  #define ETHQOS_MAC_CTRL_SPEED_MODE		BIT(14)
>  #define ETHQOS_MAC_CTRL_PORT_SEL		BIT(15)
>  
> +#define SGMII_10M_RX_CLK_DVDR			0x31
> +
>  struct ethqos_emac_por {
>  	unsigned int offset;
>  	unsigned int value;
> @@ -598,6 +601,9 @@ static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
>  	return 0;
>  }
>  
> +/* On interface toggle MAC registers gets reset.
> + * Configure MAC block for SGMII on ethernet phy link up
> + */
>  static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
>  {
>  	int val;
> @@ -617,6 +623,10 @@ static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
>  	case SPEED_10:
>  		val |= ETHQOS_MAC_CTRL_PORT_SEL;
>  		val &= ~ETHQOS_MAC_CTRL_SPEED_MODE;
> +		rgmii_updatel(ethqos, RGMII_CONFIG_SGMII_CLK_DVDR,
> +			      FIELD_PREP(RGMII_CONFIG_SGMII_CLK_DVDR,
> +					 SGMII_10M_RX_CLK_DVDR),
> +			      RGMII_IO_MACRO_CONFIG);
>  		break;
>  	}
>  
> -- 
> 2.17.1
> 

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Re: [PATCH net v4] net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Tue, 12 Dec 2023 14:52:08 +0530 you wrote:
> In 10M SGMII mode all the packets are being dropped due to wrong Rx clock.
> SGMII 10MBPS mode needs RX clock divider programmed to avoid drops in Rx.
> Update configure SGMII function with Rx clk divider programming.
> 
> Fixes: 463120c31c58 ("net: stmmac: dwmac-qcom-ethqos: add support for SGMII")
> Tested-by: Andrew Halaney <ahalaney@redhat.com>
> Signed-off-by: Sneh Shah <quic_snehshah@quicinc.com>
> 
> [...]

Here is the summary with links:
  - [net,v4] net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX
    https://git.kernel.org/netdev/net/c/981d947bcd38

You are awesome, thank you!
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