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net: macb: ensure interface is not suspended on at91rm9200

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[ Upstream commit e6a41c23df0d5da01540d2abef41591589c0b4be ]

Because of autosuspend, at91ether_start is called with clocks disabled.
Ensure that pm_runtime doesn't suspend the interface as soon as it is
opened as there is no pm_runtime support is the other relevant parts of the
platform support for at91rm9200.

Fixes: d54f89af6cc4 ("net: macb: Add pm runtime support")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Belloni 2020-02-12 17:45:38 +01:00 committed by Greg Kroah-Hartman
parent 9310357f61
commit e99e2f59d9
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/cadence/macb_main.c
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@ -3690,6 +3690,10 @@ static int at91ether_open(struct net_device *dev)
u32 ctl;
int ret;
ret = pm_runtime_get_sync(&lp->pdev->dev);
if (ret < 0)
return ret;
/* Clear internal statistics */
ctl = macb_readl(lp, NCR);
macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
@ -3750,7 +3754,7 @@ static int at91ether_close(struct net_device *dev)
q->rx_buffers, q->rx_buffers_dma);
q->rx_buffers = NULL;
return 0;
return pm_runtime_put(&lp->pdev->dev);
}
/* Transmit packet */