AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/dma/hsu
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Andy Shevchenko 4f4bc0abff dmaengine: hsu: correct use of channel status register 
There is a typo in documentation regarding to descriptor empty bit (DESCE)
which is set to 1 when descriptor is empty. Thus, status register at the end of
a transfer usually returns all DESCE bits set and thus it will never be zero.

Moreover, there are 2 bits (CDESC) that encode current descriptor, on which
interrupt has been asserted. In case when we have few descriptors programmed we
might have non-zero value.

Remove DESCE and CDESC bits from DMA channel status register (HSU_CH_SR) when
reading it.

Fixes: 2b49e0c567 ("dmaengine: append hsu DMA driver")
Cc: stable@vger.kernel.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2016-04-04 09:41:43 -07:00
..
hsu.c dmaengine: hsu: correct use of channel status register 2016-04-04 09:41:43 -07:00
hsu.h dmaengine: hsu: correct use of channel status register 2016-04-04 09:41:43 -07:00
Kconfig dmaengine: hsu: make the UART driver in control of selecting this driver 2015-10-17 21:22:08 -07:00
Makefile dmaengine: append hsu DMA driver 2015-03-07 03:23:02 +01:00
pci.c dmaengine: hsu: remove platform data 2015-10-17 21:22:08 -07:00