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Blackfin SPI Driver: fix bug - correct usage of struct spi_transfer.cs_change

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According to comments in linux/spi/spi.h:

 * All SPI transfers start with the relevant chipselect active.  Normally
 * it stays selected until after the last transfer in a message. Drivers
 * can affect the chipselect signal using cs_change.
 *
 * (i) If the transfer isn't the last one in the message, this flag is
 * used to make the chipselect briefly go inactive in the middle of the
 * message.  Toggling chipselect in this way may be needed to terminate
 * a chip command, letting a single spi_message perform all of group of
 * chip transactions together.
 *
 * (ii) When the transfer is the last one in the message, the chip may
 * stay selected until the next transfer.  On multi-device SPI busses
 * with nothing blocking messages going to other devices, this is just
 * a performance hint; starting a message to another device deselects
 * this one.  But in other cases, this can be used to ensure correctness.
 * Some devices need protocol transactions to be built from a series of
 * spi_message submissions, where the content of one message is determined
 * by the results of previous messages and where the whole transaction
 * ends when the chipselect goes intactive.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yi Li 2009-04-06 19:00:49 -07:00 committed by Linus Torvalds
parent 2cf3683472
commit b9b2a76a43
1 changed files with 8 additions and 9 deletions
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17
drivers/spi/spi_bfin5xx.c
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@ -540,15 +540,13 @@ static void giveback(struct driver_data *drv_data)
msg->state = NULL;
/* disable chip select signal. And not stop spi in autobuffer mode */
if (drv_data->tx_dma != 0xFFFF) {
cs_deactive(drv_data, chip);
bfin_spi_disable(drv_data);
}
if (!drv_data->cs_change)
cs_deactive(drv_data, chip);
/* Not stop spi in autobuffer mode */
if (drv_data->tx_dma != 0xFFFF)
bfin_spi_disable(drv_data);
if (msg->complete)
msg->complete(msg->context);
}
@ -757,7 +755,8 @@ static void pump_transfers(unsigned long data)
write_STAT(drv_data, BIT_STAT_CLR);
cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
cs_active(drv_data, chip);
if (drv_data->cs_change)
cs_active(drv_data, chip);
dev_dbg(&drv_data->pdev->dev,
"now pumping a transfer: width is %d, len is %d\n",
@ -919,11 +918,11 @@ static void pump_transfers(unsigned long data)
} else {
/* Update total byte transfered */
message->actual_length += drv_data->len_in_bytes;
/* Move to next transfer of this msg */
message->state = next_transfer(drv_data);
if (drv_data->cs_change)
cs_deactive(drv_data, chip);
}
/* Schedule next transfer tasklet */
tasklet_schedule(&drv_data->pump_transfers);