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Date: Mon, 17 Dec 2018 19:49:47 -0800
From: Sean Wang <sean.wang@...nel.org>
To: Biao Huang <biao.huang@...iatek.com>
Cc: davem@...emloft.net, robh+dt@...nel.org, mark.rutland@....com,
devicetree@...r.kernel.org, nelson.chang@...iatek.com,
Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
Liguo Zhang <liguo.zhang@...iatek.com>,
linux-kernel@...r.kernel.org,
Matthias Brugger <matthias.bgg@...il.com>,
joabreu@...opsys.com, linux-mediatek@...ts.infradead.org,
honghui.zhang@...iatek.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] net-next: stmmac: dwmac-mediatek: remove fine-tune property
On Mon, Dec 17, 2018 at 6:43 PM Biao Huang <biao.huang@...iatek.com> wrote:
>
> 1. remove fine-tune property and related setting to simplify
> the timing adjustment flow.
> 2. set timing value according to the value from device tree,
> and will not care whether PHY insert internal delay.
>
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> ---
> .../net/ethernet/stmicro/stmmac/dwmac-mediatek.c | 71 +++++++-------------
> 1 file changed, 24 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> index e400cbd..801c797 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> @@ -44,7 +44,6 @@ struct mac_delay_struct {
> u32 rx_delay;
> bool tx_inv;
> bool rx_inv;
> - bool fine_tune;
> };
>
> struct mediatek_dwmac_plat_data {
> @@ -105,16 +104,28 @@ static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat)
> return 0;
> }
>
> -static void mt2712_delay_ps2stage(struct mac_delay_struct *mac_delay)
> +static void mt2712_delay_ps2stage(struct mediatek_dwmac_plat_data *plat)
> {
> - if (mac_delay->fine_tune) {
> - /* 170ps per stage for fine tune delay macro circuit*/
> - mac_delay->tx_delay /= 170;
> - mac_delay->rx_delay /= 170;
> - } else {
> - /* 550ps per stage for coarse tune delay macro circuit*/
> + struct mac_delay_struct *mac_delay = &plat->mac_delay;
> +
> + switch (plat->phy_mode) {
> + case PHY_INTERFACE_MODE_MII:
> + case PHY_INTERFACE_MODE_RMII:
> + /* 550ps per stage for mii/rmii*/
> mac_delay->tx_delay /= 550;
> mac_delay->rx_delay /= 550;
> + break;
> + case PHY_INTERFACE_MODE_RGMII:
> + case PHY_INTERFACE_MODE_RGMII_TXID:
> + case PHY_INTERFACE_MODE_RGMII_RXID:
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + /* 170ps per stage for mii/rmii*/
mii/rmii appear to be a typo here.
Additionally, I'd suggest using the capital letters for these abbreviations.
> + mac_delay->tx_delay /= 170;
> + mac_delay->rx_delay /= 170;
> + break;
> + default:
> + dev_err(plat->dev, "phy interface not supported\n");
> + break;
> }
> }
>
> @@ -123,7 +134,7 @@ static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat)
> struct mac_delay_struct *mac_delay = &plat->mac_delay;
> u32 delay_val = 0, fine_val = 0;
>
> - mt2712_delay_ps2stage(mac_delay);
> + mt2712_delay_ps2stage(plat);
>
> switch (plat->phy_mode) {
> case PHY_INTERFACE_MODE_MII:
> @@ -167,13 +178,10 @@ static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat)
> fine_val = ETH_RMII_DLY_TX_INV;
> break;
> case PHY_INTERFACE_MODE_RGMII:
> - /* the PHY is not responsible for inserting any internal
> - * delay by itself in PHY_INTERFACE_MODE_RGMII case,
> - * so Ethernet MAC will insert delays for both transmit
> - * and receive path here.
> - */
> - if (mac_delay->fine_tune)
> - fine_val = ETH_FINE_DLY_GTXC | ETH_FINE_DLY_RXC;
> + case PHY_INTERFACE_MODE_RGMII_TXID:
> + case PHY_INTERFACE_MODE_RGMII_RXID:
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + fine_val = ETH_FINE_DLY_GTXC | ETH_FINE_DLY_RXC;
>
> delay_val |= FIELD_PREP(ETH_DLY_GTXC_ENABLE, !!mac_delay->tx_delay);
> delay_val |= FIELD_PREP(ETH_DLY_GTXC_STAGES, mac_delay->tx_delay);
> @@ -183,36 +191,6 @@ static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat)
> delay_val |= FIELD_PREP(ETH_DLY_RXC_STAGES, mac_delay->rx_delay);
> delay_val |= FIELD_PREP(ETH_DLY_RXC_INV, mac_delay->rx_inv);
> break;
> - case PHY_INTERFACE_MODE_RGMII_TXID:
> - /* the PHY should insert an internal delay for the transmit
> - * path in PHY_INTERFACE_MODE_RGMII_TXID case,
> - * so Ethernet MAC will insert the delay for receive path here.
> - */
> - if (mac_delay->fine_tune)
> - fine_val = ETH_FINE_DLY_RXC;
> -
> - delay_val |= FIELD_PREP(ETH_DLY_RXC_ENABLE, !!mac_delay->rx_delay);
> - delay_val |= FIELD_PREP(ETH_DLY_RXC_STAGES, mac_delay->rx_delay);
> - delay_val |= FIELD_PREP(ETH_DLY_RXC_INV, mac_delay->rx_inv);
> - break;
> - case PHY_INTERFACE_MODE_RGMII_RXID:
> - /* the PHY should insert an internal delay for the receive
> - * path in PHY_INTERFACE_MODE_RGMII_RXID case,
> - * so Ethernet MAC will insert the delay for transmit path here.
> - */
> - if (mac_delay->fine_tune)
> - fine_val = ETH_FINE_DLY_GTXC;
> -
> - delay_val |= FIELD_PREP(ETH_DLY_GTXC_ENABLE, !!mac_delay->tx_delay);
> - delay_val |= FIELD_PREP(ETH_DLY_GTXC_STAGES, mac_delay->tx_delay);
> - delay_val |= FIELD_PREP(ETH_DLY_GTXC_INV, mac_delay->tx_inv);
> - break;
> - case PHY_INTERFACE_MODE_RGMII_ID:
> - /* the PHY should insert internal delays for both transmit
> - * and receive path in PHY_INTERFACE_MODE_RGMII_RXID case,
> - * so Ethernet MAC will NOT insert any delay here.
> - */
> - break;
> default:
> dev_err(plat->dev, "phy interface not supported\n");
> return -EINVAL;
> @@ -270,7 +248,6 @@ static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat)
>
> mac_delay->tx_inv = of_property_read_bool(plat->np, "mediatek,txc-inverse");
> mac_delay->rx_inv = of_property_read_bool(plat->np, "mediatek,rxc-inverse");
> - mac_delay->fine_tune = of_property_read_bool(plat->np, "mediatek,fine-tune");
> plat->rmii_rxc = of_property_read_bool(plat->np, "mediatek,rmii-rxc");
>
> return 0;
> --
> 1.7.9.5
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
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