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PCI: rockchip: recover PCIe uDMA transfer parameter

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Change-Id: Iddc7fe154bebd2cbd46645bf519cce1f42815286
Signed-off-by: Simon Xue <xxm@rock-chips.com>
This commit is contained in:
Simon Xue
2019-01-10 09:33:24 +08:00
committed by Tao Huang
parent 6395f07d89
commit b43575b260
1 changed files with 14 additions and 0 deletions
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14
drivers/pci/host/pcie-rockchip.c
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@@ -1444,6 +1444,7 @@ static ssize_t pcie_reset_ep_store(struct device *dev,
u32 val = 0;
int err;
struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
struct dma_trx_obj *obj = rockchip->dma_obj;
err = kstrtou32(buf, 10, &val);
if (err)
@@ -1464,6 +1465,19 @@ static ssize_t pcie_reset_ep_store(struct device *dev,
err = rockchip_cfg_atu(rockchip);
if (err)
return err;
/*
* In order not to bother sending remain but unused data to the
* peer,we need to flush out the pending data to the link before
* setting up the ATU. This is safe as the peer's ATU isn't
* ready at this moment and the sender also can turn its FSM
* back without any exception.
*/
obj->loop_count = 0;
obj->local_read_available = 0x0;
obj->local_write_available = 0xff;
obj->remote_write_available = 0xff;
obj->dma_free = true;
}
return size;