On Thursday 29 June 2017 07:24:18 Finn Thain wrote:
> Ondrej, would you please test this new series?
>
> Changed since v1:
> - PDMA transfer residual is calculated earlier.
> - End of DMA flag check is now polled (if there is any residual).
>
> Changed since v2:
> - Bail out of transfer loops when Gated IRQ gets asserted.
> - Make udelay conditional on board type.
> - Drop sg_tablesize patch due to performance regression.
>
> Changed since v3:
> - Add Ondrej's workaround for corrupt WRITE commands on DTC boards.
> - Reset the 53c400 logic after any short PDMA transfer.
> - Don't fail the transfer if the 53c400 logic got a reset.
>
> Changed since v4:
> - Bail out of transfer loops when Gated IRQ gets asserted. (Again.)
> - Always call wait_for_53c80_registers() at end of transfer.
> - Drain chip buffers after PDMA receive is interrupted.
> - Rework residual calculation.
> - Add new patch to correct DMA terminology.
>
>
> Finn Thain (2):
> g_NCR5380: Cleanup comments and whitespace
> g_NCR5380: Use unambiguous terminology for PDMA send and receive
>
> Ondrej Zary (4):
> g_NCR5380: Fix PDMA transfer size
> g_NCR5380: End PDMA transfer correctly on target disconnection
> g_NCR5380: Limit PDMA send to 512 B to avoid data corruption on
> DTC3181E
> g_NCR5380: Re-work PDMA loops
>
> drivers/scsi/g_NCR5380.c | 260
> +++++++++++++++++++++++++---------------------- 1 file changed, 139
> insertions(+), 121 deletions(-)
This fixes the DTC read corruption, although I don't like the repeated
ctl_status register reads:
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -533,7 +533,7 @@ static inline int generic_NCR5380_precv(struct NCR5380_hostdata *hostdata,
break;
if (NCR5380_read(hostdata->c400_ctl_status) &
- CSR_HOST_BUF_NOT_RDY)
+ CSR_GATED_53C80_IRQ && (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY))
break;
if (hostdata->io_port && hostdata->io_width == 2)
@@ -546,10 +546,6 @@ static inline int generic_NCR5380_precv(struct NCR5380_hostdata *hostdata,
memcpy_fromio(dst + start,
hostdata->io + NCR53C400_host_buffer, 128);
start += 128;
-
- if (NCR5380_read(hostdata->c400_ctl_status) &
- CSR_GATED_53C80_IRQ)
- break;
}
residual = len - start;
Writes seem to work correctly.
--
Ondrej Zary
