linux-kernel - Re: [PATCH 2/2] net: stmmac: Add Ingenic SoCs MAC support.

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Date:   Tue, 8 Jun 2021 19:33:33 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, dongsheng.qiu@...enic.com,
        aric.pzqi@...enic.com, rick.tyliu@...enic.com,
        sihui.liu@...enic.com, jun.jiang@...enic.com,
        sernia.zhou@...mail.com, paul@...pouillou.net
Subject: Re: [PATCH 2/2] net: stmmac: Add Ingenic SoCs MAC support.

Hi Andrew,

On 2021/6/8 上午8:01, Andrew Lunn wrote:
>>   config DWMAC_ROCKCHIP
>>   	tristate "Rockchip dwmac support"
>> -	default ARCH_ROCKCHIP
>> +	default MACH_ROCKCHIP
>>   	depends on OF && (ARCH_ROCKCHIP || COMPILE_TEST)
>>   	select MFD_SYSCON
>>   	help
>> @@ -164,7 +176,7 @@ config DWMAC_STI
>>   
>>   config DWMAC_STM32
>>   	tristate "STM32 DWMAC support"
>> -	default ARCH_STM32
>> +	default MACH_STM32
> It would be good to explain in the commit message why you are changing
> these two. It is not obvious.


Apologize for my carelessness, this is left over accidentally when 
cleaning up the code, I will remove them in the next version.


>
>> +static int jz4775_mac_set_mode(struct plat_stmmacenet_data *plat_dat)
>> +{
>> +	struct ingenic_mac *mac = plat_dat->bsp_priv;
>> +	int val;
>> +
>> +	switch (plat_dat->interface) {
>> +	case PHY_INTERFACE_MODE_MII:
>> +		val = FIELD_PREP(MACPHYC_TXCLK_SEL_MASK, MACPHYC_TXCLK_SEL_INPUT) |
>> +			  FIELD_PREP(MACPHYC_PHY_INFT_MASK, MACPHYC_PHY_INFT_MII);
>> +		pr_debug("MAC PHY Control Register: PHY_INTERFACE_MODE_MII\n");
>> +		break;
>> +
>> +	case PHY_INTERFACE_MODE_GMII:
>> +		val = FIELD_PREP(MACPHYC_TXCLK_SEL_MASK, MACPHYC_TXCLK_SEL_INPUT) |
>> +			  FIELD_PREP(MACPHYC_PHY_INFT_MASK, MACPHYC_PHY_INFT_GMII);
>> +		pr_debug("MAC PHY Control Register: PHY_INTERFACE_MODE_GMII\n");
>> +		break;
>> +
>> +	case PHY_INTERFACE_MODE_RMII:
>> +		val = FIELD_PREP(MACPHYC_TXCLK_SEL_MASK, MACPHYC_TXCLK_SEL_INPUT) |
>> +			  FIELD_PREP(MACPHYC_PHY_INFT_MASK, MACPHYC_PHY_INFT_RMII);
>> +		pr_debug("MAC PHY Control Register: PHY_INTERFACE_MODE_RMII\n");
>> +		break;
>> +
>> +	case PHY_INTERFACE_MODE_RGMII:
> What about the other three RGMII modes?
>
>> +	case PHY_INTERFACE_MODE_RGMII:
>> +		val = FIELD_PREP(MACPHYC_TX_SEL_MASK, MACPHYC_TX_SEL_DELAY) |
>> +			  FIELD_PREP(MACPHYC_TX_DELAY_MASK, MACPHYC_TX_DELAY_63_UNIT) |
>> +			  FIELD_PREP(MACPHYC_RX_SEL_MASK, MACPHYC_RX_SEL_ORIGIN) |
>> +			  FIELD_PREP(MACPHYC_PHY_INFT_MASK, MACPHYC_PHY_INFT_RGMII);
> What exactly does MACPHYC_TX_DELAY_63_UNIT mean here? Ideally, the MAC
> should not be adding any RGMII delays. It should however pass mode
> through to the PHY, so it can add the delays, if the mode indicates it
> should, e.g. PHY_INTERFACE_MODE_RGMII_ID. This is also why you should
> be handling all 4 RGMII modes here, not just one.


MACPHYC_TX_DELAY_63_UNIT means set MAC TX clk delay to 63 units (similar to the "tx-delay" in dwmac-rk.c). However, the manual does not clearly describe the time span of one unit, after consulting engineer of Ingenic, I learned that the value is recommended to be set to 63.
I will change it to be similar to the way done in dwmac-rk.c.

Thanks and best regards!


>
> 	 Andrew