From 782a895693a52fd8b288c33bdd7e98357888fc1f Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 22 Oct 2010 02:01:48 -0400 Subject: spi/bfin_spi: handle error/status changes after data interrupts The error interrupt on the BF537 SIC cannot be enabled on a per-peripheral basis. Once the error interrupt is enabled for one peripheral, it is automatically enabled for all. So in the Blackfin on-chip SPI driver, we need to clear out these known errors in the data interrupt once we've successfully finished processing all of the pending data. Signed-off-by: Michael Hennerich Signed-off-by: Mike Frysinger Signed-off-by: Grant Likely --- drivers/spi/spi_bfin5xx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index ab483a0..d3da41d 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -504,6 +504,15 @@ static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id) "in dma_irq_handler dmastat:0x%x spistat:0x%x\n", dmastat, spistat); + if (drv_data->rx != NULL) { + u16 cr = read_CTRL(drv_data); + /* discard old RX data and clear RXS */ + bfin_spi_dummy_read(drv_data); + write_CTRL(drv_data, cr & ~BIT_CTL_ENABLE); /* Disable SPI */ + write_CTRL(drv_data, cr & ~BIT_CTL_TIMOD); /* Restore State */ + write_STAT(drv_data, BIT_STAT_CLR); /* Clear Status */ + } + clear_dma_irqstat(drv_data->dma_channel); /* -- cgit v1.1