linux-kernel - Re: [PATCH net-next v3 1/3] net: stmmac: Add basic dwxgmac4 support to stmmac core

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Message-ID: <CAMdnO-+_w=XTE7TPv-b6RtAbjK1CC9jgf1kukmg9W-_0Dj8O2A@mail.gmail.com>
Date: Fri, 2 Aug 2024 14:43:05 -0700
From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, alexandre.torgue@...s.st.com, joabreu@...opsys.com, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	mcoquelin.stm32@...il.com, bcm-kernel-feedback-list@...adcom.com, 
	richardcochran@...il.com, ast@...nel.org, daniel@...earbox.net, 
	hawk@...nel.org, john.fastabend@...il.com, linux-kernel@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org, andrew@...n.ch, 
	horms@...nel.org, florian.fainelli@...adcom.com
Subject: Re: [PATCH net-next v3 1/3] net: stmmac: Add basic dwxgmac4 support
 to stmmac core

Sorry for reposting, resending the reply since I missed reply to all.

On Fri, Aug 2, 2024 at 1:21 AM Russell King (Oracle)
<linux@...linux.org.uk> wrote:
>
> On Thu, Aug 01, 2024 at 08:18:20PM -0700, jitendra.vegiraju@...adcom.com wrote:
> > +static int rd_dma_ch_ind(void __iomem *ioaddr, u8 mode, u32 channel)
> > +{
> > +     u32 reg_val = 0;
> > +     u32 val = 0;
>
> val is unnecessary.
True, I will fix it.
>
> > +
> > +     reg_val |= mode << XGMAC4_MSEL_SHIFT & XGMAC4_MODE_SELECT;
>
> Consider using:
>
>         reg_val |= FIELD_PREP(XGMAC4_MODE_SELECT, mode);
>
Thanks, I will make the changes.

> and similarly everywhere else you use a shift and mask. With this, you
> can remove _all_ _SHIFT definitions in your header file.
>
> > +     reg_val |= channel << XGMAC4_AOFF_SHIFT & XGMAC4_ADDR_OFFSET;
> > +     reg_val |= XGMAC4_CMD_TYPE | XGMAC4_OB;
> > +     writel(reg_val, ioaddr + XGMAC4_DMA_CH_IND_CONTROL);
> > +     val = readl(ioaddr + XGMAC4_DMA_CH_IND_DATA);
> > +     return val;
>
>         return readl(ioaddr + XGMAC4_DMA_CH_IND_DATA);
>
> ...
>
> > +void dwxgmac4_dma_init(void __iomem *ioaddr,
> > +                    struct stmmac_dma_cfg *dma_cfg, int atds)
> > +{
> > +     u32 value;
> > +     u32 i;
> > +
> > +     value = readl(ioaddr + XGMAC_DMA_SYSBUS_MODE);
> > +
> > +     if (dma_cfg->aal)
> > +             value |= XGMAC_AAL;
> > +
> > +     if (dma_cfg->eame)
> > +             value |= XGMAC_EAME;
>
> What if dma_cfg doesn't have these bits set? Is it possible they will be
> set in the register?
The reset default for these bits is zero.
>
> Thanks.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!