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| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2012-11-22 18:16:37 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2012-11-22 18:16:37 +0100 |
| commit | c4b4b732b2e99e6e302d90d57f2a4f5c9516d9a3 (patch) | |
| tree | 158c098eac7c67375e037578e3f17e689efe03ae /drivers/dma/mv_xor.c | |
| parent | 9f3410ff217f55c2a30bd1b2eb1032806d17c80e (diff) | |
| download | linux-c4b4b732b2e99e6e302d90d57f2a4f5c9516d9a3.tar.bz2 | |
dma: mv_xor: clear the window override control registers
The XOR channels on Marvell SoCs have a Window Override Control
register that allow to do some fancy things with addresses. Those
features are not used by the driver, but some U-Boot versions anyway
modify those registers.
For some reason, the U-Boot on OpenBlocks AX3-4 was setting an invalid
value in those registers when the addition 2 GB DRAM chip was plugged
into the board, causing the XOR driver to fail in using the XOR
engines.
By setting those registers to 0 during the driver initialization, we
ensure that the registers are configured according with the driver
operation model.
Thanks to Lior Amsalem <alior@marvell.com> for his help in debugging
this problem.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'drivers/dma/mv_xor.c')
| -rw-r--r-- | drivers/dma/mv_xor.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index f450fe8cbd61..2c69b89eac4f 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -1240,6 +1240,8 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev, writel(win_enable, base + WINDOW_BAR_ENABLE(0)); writel(win_enable, base + WINDOW_BAR_ENABLE(1)); + writel(0, base + WINDOW_OVERRIDE_CTRL(0)); + writel(0, base + WINDOW_OVERRIDE_CTRL(1)); } static int __devinit mv_xor_probe(struct platform_device *pdev) |