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net: ethernet: ravb: Suspend and resume the transmission flow

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The current driver does not follow the latest datasheet and does not
suspend the flow when stopping DMA and resume it when starting. Update
the driver to do so.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
[Niklas: Rebase from BSP and reword commit message]
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://patch.msgid.link/20260401183608.1852225-1-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yoshihiro Shimoda
2026-04-01 20:36:08 +02:00
committed by Jakub Kicinski
parent 48a5e77b49
commit 353d8e7989
1 changed files with 9 additions and 0 deletions
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9
drivers/net/ethernet/renesas/ravb_main.c
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@@ -694,6 +694,9 @@ static int ravb_dmac_init(struct net_device *ndev)
const struct ravb_hw_info *info = priv->info;
int error;
/* Clear transmission suspension */
ravb_modify(ndev, CCC, CCC_DTSR, 0);
/* Set CONFIG mode */
error = ravb_set_opmode(ndev, CCC_OPC_CONFIG);
if (error)
@@ -1103,6 +1106,12 @@ static int ravb_stop_dma(struct net_device *ndev)
if (error)
return error;
/* Request for transmission suspension */
ravb_modify(ndev, CCC, CCC_DTSR, CCC_DTSR);
error = ravb_wait(ndev, CSR, CSR_DTS, CSR_DTS);
if (error)
netdev_err(ndev, "failed to stop AXI BUS\n");
/* Stop AVB-DMAC process */
return ravb_set_opmode(ndev, CCC_OPC_CONFIG);
}