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| author | Christoph Fritz <chf.fritz@googlemail.com> | 2014-04-30 10:32:02 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-05-05 09:19:18 +0200 |
| commit | 7af9c3a84384b4330ba961ea5bf3a7a79d8ad1f1 (patch) | |
| tree | 0722b00eb90dd6dafcc3d970cbfa2c15d79c2848 | |
| parent | 5dafef6aaf81d96f92eff3365f62f18fe89b3136 (diff) | |
| download | barebox-7af9c3a84384b4330ba961ea5bf3a7a79d8ad1f1.tar.gz barebox-7af9c3a84384b4330ba961ea5bf3a7a79d8ad1f1.tar.xz | |
net cpsw: fix rx stability under heavy network load
RX DMA Head Descriptor Pointer can get 0 when there is a lot of traffic,
which results in a timeout error. A good way to provoke this error is by
sending lots of ARP requests. This patch makes sure that the RX DMA Head
Descriptor Pointer is set.
The origin driver, from which this is derived, already contains this fix.
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | drivers/net/cpsw.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c index 52adf50205..ec3263d4aa 100644 --- a/drivers/net/cpsw.c +++ b/drivers/net/cpsw.c @@ -741,8 +741,13 @@ static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan, if (buffer) *buffer = (void *)readl(&desc->sw_buffer); - if (status & CPDMA_DESC_OWNER) + if (status & CPDMA_DESC_OWNER) { + if (readl(chan->hdp) == 0) { + if (readl(&desc->hw_mode) & CPDMA_DESC_OWNER) + writel((u32)desc, chan->hdp); + } return -EBUSY; + } chan->head = (void *)readl(&desc->hw_next); |