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stmmac: hardware TX COE doesn't work when force_thresh_dma_mode is set

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Commit f748be531d ("stmmac: support new GMAC4") reverted a previous fix
by mistake. This commit re-applies said fix:

  commit dec2165ff3
  Author: Sonic Zhang <sonic.zhang@analog.com>
  Date:   Thu Jan 22 14:55:57 2015 +0800
  stmmac: hardware TX COE doesn't work when force_thresh_dma_mode is set

  Clear the TX COE bit when force_thresh_dma_mode is set even hardware
  dma capability says support.

  Tested on BF609.

  Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
  Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  Signed-off-by: David S. Miller <davem@davemloft.net>

Tested on LPC4350 Hitex board.

Fixes: f748be531d ("stmmac: support new GMAC4")
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Tested-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ezequiel Garcia 2016-05-16 12:41:07 -03:00 committed by David S. Miller
parent 73d9011c1f
commit a8df35d458
1 changed files with 6 additions and 1 deletions
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7
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View file

@ -3131,7 +3131,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
priv->plat->enh_desc = priv->dma_cap.enh_desc;
priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
priv->plat->tx_coe = priv->dma_cap.tx_coe;
/* TXCOE doesn't work in thresh DMA mode */
if (priv->plat->force_thresh_dma_mode)
priv->plat->tx_coe = 0;
else
priv->plat->tx_coe = priv->dma_cap.tx_coe;
/* In case of GMAC4 rx_coe is from HW cap register. */
priv->plat->rx_coe = priv->dma_cap.rx_coe;