[PATCH net-next] net: stmmac: dwmac4: Report DCB feature capability

[Maxime Chevallier]

Hi,

On 6/3/26 19:36, Ovidiu Panait wrote:
> Bit 16 of the MAC HW Feature1 register reports the DCB (Data Centre
> Bridging) feature. Read it so that dma_cap.dcben and the debugfs
> report it accurately. Right now it is always reported as being disabled.
> 
> Signed-off-by: Ovidiu Panait <ovidiu.panait.rb at renesas.com>

This matches with what I have in the iMX8MP ref manual :)

Reviewed-by: Maxime Chevallier <maxime.chevallier at bootlin.com>

Thank you,

Maxime

> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac4.h     | 1 +
>  drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> index ffcd036d4c02..6382836828ba 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> @@ -198,6 +198,7 @@ enum power_event {
>  #define GMAC_HW_FEAT_AVSEL		BIT(20)
>  #define GMAC_HW_TSOEN			BIT(18)
>  #define GMAC_HW_FEAT_SPHEN		BIT(17)
> +#define GMAC_HW_FEAT_DCBEN		BIT(16)
>  #define GMAC_HW_ADDR64			GENMASK(15, 14)
>  #define GMAC_HW_TXFIFOSIZE		GENMASK(10, 6)
>  #define GMAC_HW_RXFIFOSIZE		GENMASK(4, 0)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> index 28728271fbc9..829a23bdad01 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> @@ -391,6 +391,7 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
>  	dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
>  	dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
>  	dma_cap->sphen = (hw_cap & GMAC_HW_FEAT_SPHEN) >> 17;
> +	dma_cap->dcben = (hw_cap & GMAC_HW_FEAT_DCBEN) >> 16;
>  
>  	dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
>  	switch (dma_cap->addr64) {