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Commit 782a8956 authored by Michael Hennerich's avatar Michael Hennerich Committed by Grant Likely
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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: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 2b9603a0

drivers/spi/spi_bfin5xx.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -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",

		"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",

		dmastat, spistat);

		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);

	clear_dma_irqstat(drv_data->dma_channel);





	/*

	/*