The patch titled
atmel_spi: chain dma transfers (update)
has been added to the -mm tree. Its filename is
atmel_spi-chain-dma-transfers-update.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: atmel_spi: chain dma transfers (update)
From: "Silvester Erdeg" <slipszi@xxxxxxxxx>
This patch adds support for chained transfers in the atmel_spi driver.
Almost all of the changes are in the reworked atmel_spi_next_xfer()
function. That's called with the driver in one of these three states:
1. It isn't transferring anything (in which case the first transfer of
the current message is going to be sent)
2. It has finished transfering a non-chainable transfer (in which case
it will go to the next transfer in the message)
3. It has finished transfering a chained transfer (in which case the
next transfer is already queued)
After that it will queue the next transfer if it can be chained.
Signed-off-by: Szilveszter Ordog <slipszi@xxxxxxxxx>
Acked-by: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/atmel_spi.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN drivers/spi/atmel_spi.c~atmel_spi-chain-dma-transfers-update drivers/spi/atmel_spi.c
--- a/drivers/spi/atmel_spi.c~atmel_spi-chain-dma-transfers-update
+++ a/drivers/spi/atmel_spi.c
@@ -191,13 +191,13 @@ static void atmel_spi_next_xfer(struct s
atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len);
remaining = xfer->len - len;
- spi_writel(as, TPR, tx_dma);
spi_writel(as, RPR, rx_dma);
+ spi_writel(as, TPR, tx_dma);
if (msg->spi->bits_per_word > 8)
len >>= 1;
- spi_writel(as, TCR, len);
spi_writel(as, RCR, len);
+ spi_writel(as, TCR, len);
} else {
xfer = as->next_transfer;
remaining = as->next_remaining_bytes;
@@ -223,16 +223,16 @@ static void atmel_spi_next_xfer(struct s
atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len);
as->next_remaining_bytes = total - len;
- spi_writel(as, TNPR, tx_dma);
spi_writel(as, RNPR, rx_dma);
+ spi_writel(as, TNPR, tx_dma);
if (msg->spi->bits_per_word > 8)
len >>= 1;
- spi_writel(as, TNCR, len);
spi_writel(as, RNCR, len);
+ spi_writel(as, TNCR, len);
} else {
- spi_writel(as, TNCR, 0);
spi_writel(as, RNCR, 0);
+ spi_writel(as, TNCR, 0);
}
/* REVISIT: We're waiting for ENDRX before we start the next
_
Patches currently in -mm which might be from slipszi@xxxxxxxxx are
atmel_spi-chain-dma-transfers.patch
atmel_spi-chain-dma-transfers-update.patch
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