[PATCH 3/6] net: dwc_eth_qos: Flush the RX descriptors on init

[Ramon Fried]

On Mon, Mar 23, 2020 at 3:45 AM Marek Vasut <marex at denx.de> wrote:
>
> Currently the code only flushes the first RX descriptor, not every entry
> in the RX descriptor ring. Fix this, to make sure the DMA engine can pick
> the RX descriptors correctly.
>
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Joe Hershberger <joe.hershberger at ni.com>
> Cc: Patrice Chotard <patrice.chotard at st.com>
> Cc: Patrick Delaunay <patrick.delaunay at st.com>
> Cc: Ramon Fried <rfried.dev at gmail.com>
> Cc: Stephen Warren <swarren at nvidia.com>
> ---
>  drivers/net/dwc_eth_qos.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c
> index c4f665bda9..66cc301c8c 100644
> --- a/drivers/net/dwc_eth_qos.c
> +++ b/drivers/net/dwc_eth_qos.c
> @@ -1243,8 +1243,8 @@ static int eqos_start(struct udevice *dev)
>                 rx_desc->des0 = (u32)(ulong)(eqos->rx_dma_buf +
>                                              (i * EQOS_MAX_PACKET_SIZE));
>                 rx_desc->des3 = EQOS_DESC3_OWN | EQOS_DESC3_BUF1V;
> +               eqos->config->ops->eqos_flush_desc(rx_desc);
>         }
> -       eqos->config->ops->eqos_flush_desc(eqos->descs);
>
>         writel(0, &eqos->dma_regs->ch0_txdesc_list_haddress);
>         writel((ulong)eqos->tx_descs, &eqos->dma_regs->ch0_txdesc_list_address);
> --
> 2.25.1
>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>