From d24bd1d0dc850e7aa68c27ec288eb699d41a5916 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Mon, 6 Apr 2009 19:00:38 -0700 Subject: [PATCH] Blackfin SPI Driver: add a few more DMA debug messages 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 Signed-off-by: Bryan Wu Cc: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bfin5xx.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 0bbe19eafc2..5acec9ff017 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -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)) -- 2.41.1