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esp_scsi: use FIFO for command submission

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Using DMA for command submission has the drawback that it might
generate additional DMA completion interrupts after the command
has been submitted to the device.
Additionally the am53c974 has a design flaw causing it
to generate spurious interrupts even though DMA completion
interrupts are not enabled.
This can be avoided by using the FIFO for command submission.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke
2014-11-24 15:37:24 +01:00
committed by Christoph Hellwig
parent 9535fff3c5
commit 3170866f88
2 changed files with 30 additions and 17 deletions
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1
drivers/scsi/esp_scsi.h
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@@ -478,6 +478,7 @@ struct esp {
#define ESP_FLAG_WIDE_CAPABLE 0x00000008
#define ESP_FLAG_QUICKIRQ_CHECK 0x00000010
#define ESP_FLAG_DISABLE_SYNC 0x00000020
#define ESP_FLAG_USE_FIFO 0x00000040
u8 select_state;
#define ESP_SELECT_NONE 0x00 /* Not selecting */