netdev - Re: [PATCH net-next v14 07/14] net: stmmac: dwmac-loongson: Detach GMAC-specific platform data init

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Message-ID: <jjjxl2mlnzfnrvljlwzuffrholdk4lduly3pxemugncwpu3d67@leqb263vpzyf>
Date: Thu, 18 Jul 2024 14:32:04 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yanteng Si <siyanteng@...ngson.cn>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com, 
	alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com, 
	chenhuacai@...nel.org, linux@...linux.org.uk, guyinggang@...ngson.cn, 
	netdev@...r.kernel.org, chris.chenfeiyang@...il.com, si.yanteng@...ux.dev
Subject: Re: [PATCH net-next v14 07/14] net: stmmac: dwmac-loongson: Detach
 GMAC-specific platform data init

On Tue, Jul 09, 2024 at 05:36:26PM +0800, Yanteng Si wrote:
> Loongson delivers two types of the network devices: Loongson GMAC and
> Loongson GNET in the framework of four CPU/Chipsets revisions:
> 
>    Chip             Network  PCI Dev ID   Synopys Version   DMA-channel
> LS2K1000 CPU         GMAC      0x7a03       v3.50a/v3.73a        1
> LS7A1000 Chipset     GMAC      0x7a03       v3.50a/v3.73a        1
> LS2K2000 CPU         GMAC      0x7a03          v3.73a            8
> LS2K2000 CPU         GNET      0x7a13          v3.73a            8
> LS7A2000 Chipset     GNET      0x7a13          v3.73a            1
> 
> The driver currently supports the chips with the Loongson GMAC network
> device synthesized with a single DMA-channel available. As a
> preparation before adding the Loongson GNET support detach the
> Loongson GMAC-specific platform data initializations to the
> loongson_gmac_data() method and preserve the common settings in the
> loongson_default_data().
> 
> While at it drop the return value statement from the
> loongson_default_data() method as redundant.

Please add a word about the plat->mac_interface field value changed to
NA. Something like this:

"Note there is no intermediate vendor-specific PCS in between the MAC
and PHY on Loongson GMAC and GNET. So the plat->mac_interface field
can be freely initialized with the PHY_INTERFACE_MODE_NA value."

Other than that the change looks good. Thanks.

Reviewed-by: Serge Semin <fancer.lancer@...il.com>

-Serge(y)

> 
> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
> Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
> ---
>  .../ethernet/stmicro/stmmac/dwmac-loongson.c  | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index f39c13a74bb5..9b2e4bdf7cc7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -11,7 +11,7 @@
>  
>  #define PCI_DEVICE_ID_LOONGSON_GMAC	0x7a03
>  
> -static int loongson_default_data(struct plat_stmmacenet_data *plat)
> +static void loongson_default_data(struct plat_stmmacenet_data *plat)
>  {
>  	plat->clk_csr = 2;	/* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
>  	plat->has_gmac = 1;
> @@ -20,16 +20,14 @@ static int loongson_default_data(struct plat_stmmacenet_data *plat)
>  	/* Set default value for multicast hash bins */
>  	plat->multicast_filter_bins = 256;
>  
> +	plat->mac_interface = PHY_INTERFACE_MODE_NA;
> +
>  	/* Set default value for unicast filter entries */
>  	plat->unicast_filter_entries = 1;
>  
>  	/* Set the maxmtu to a default of JUMBO_LEN */
>  	plat->maxmtu = JUMBO_LEN;
>  
> -	/* Set default number of RX and TX queues to use */
> -	plat->tx_queues_to_use = 1;
> -	plat->rx_queues_to_use = 1;
> -
>  	/* Disable Priority config by default */
>  	plat->tx_queues_cfg[0].use_prio = false;
>  	plat->rx_queues_cfg[0].use_prio = false;
> @@ -42,6 +40,14 @@ static int loongson_default_data(struct plat_stmmacenet_data *plat)
>  
>  	plat->dma_cfg->pbl = 32;
>  	plat->dma_cfg->pblx8 = true;
> +}
> +
> +static int loongson_gmac_data(struct plat_stmmacenet_data *plat)
> +{
> +	loongson_default_data(plat);
> +
> +	plat->tx_queues_to_use = 1;
> +	plat->rx_queues_to_use = 1;
>  
>  	return 0;
>  }
> @@ -111,11 +117,10 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  	}
>  
>  	plat->phy_interface = phy_mode;
> -	plat->mac_interface = PHY_INTERFACE_MODE_GMII;
>  
>  	pci_set_master(pdev);
>  
> -	loongson_default_data(plat);
> +	loongson_gmac_data(plat);
>  	memset(&res, 0, sizeof(res));
>  	res.addr = pcim_iomap_table(pdev)[0];
>  
> -- 
> 2.31.4
>