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dw_spi: Fix missing final read in some polling situations 

There is a possibility that the last word of a transaction will be lost
if data is not ready.  Re-read in poll_transfer() to solve this issue
when poll_mode is enabled.

Verified on SPI touch screen device.

Signed-off-by: Major Lee <major_lee@wistron.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Major Lee 2010-12-10 10:13:49 +00:00 committed by Linus Torvalds
parent 54efdfeb49
commit 3d0b6087f3
1 changed files with 5 additions and 0 deletions
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5
drivers/spi/dw_spi.c
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@ -413,6 +413,11 @@ static void poll_transfer(struct dw_spi *dws)
{ {
while (dws->write(dws)) while (dws->write(dws))
dws->read(dws); dws->read(dws);
/*
* There is a possibility that the last word of a transaction
* will be lost if data is not ready. Re-read to solve this issue.
*/
dws->read(dws);
transfer_complete(dws); transfer_complete(dws);
} }