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Blackfin SPI Driver: add a few more DMA debug messages

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Because of DMA hardware issue, we were trying to use software workaround.
This patch add some useful debug messages to help us debugging the DMA
code.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
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:
Mike Frysinger 2009-04-06 19:00:38 -07:00 committed by Linus Torvalds
parent 59bfcc6648
commit d24bd1d0dc
1 changed files with 10 additions and 2 deletions
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12
drivers/spi/spi_bfin5xx.c
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@ -559,9 +559,13 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
struct driver_data *drv_data = dev_id;
struct chip_data *chip = drv_data->cur_chip;
struct spi_message *msg = drv_data->cur_msg;
unsigned short dmastat = get_dma_curr_irqstat(drv_data->dma_channel);
u16 spistat = read_STAT(drv_data);
dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
dev_dbg(&drv_data->pdev->dev,
"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
dmastat, spistat);
clear_dma_irqstat(drv_data->dma_channel);
/* Wait for DMA to complete */
@ -631,6 +635,7 @@ static void pump_transfers(unsigned long data)
/* Handle for abort */
if (message->state == ERROR_STATE) {
dev_dbg(&drv_data->pdev->dev, "transfer: we've hit an error\n");
message->status = -EIO;
giveback(drv_data);
return;
@ -638,6 +643,7 @@ static void pump_transfers(unsigned long data)
/* Handle end of message */
if (message->state == DONE_STATE) {
dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
message->status = 0;
giveback(drv_data);
return;
@ -645,6 +651,7 @@ static void pump_transfers(unsigned long data)
/* Delay if requested at end of transfer */
if (message->state == RUNNING_STATE) {
dev_dbg(&drv_data->pdev->dev, "transfer: still running ...\n");
previous = list_entry(transfer->transfer_list.prev,
struct spi_transfer, transfer_list);
if (previous->delay_usecs)
@ -806,7 +813,8 @@ static void pump_transfers(unsigned long data)
dma_config = (RESTART | dma_width | DI_EN);
if (drv_data->rx != NULL) {
/* set transfer mode, and enable SPI */
dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
dev_dbg(&drv_data->pdev->dev, "doing DMA in to %p (size %zx)\n",
drv_data->rx, drv_data->len_in_bytes);
/* invalidate caches, if needed */
if (bfin_addr_dcachable((unsigned long) drv_data->rx))