> -----Original Message----- > From: Vinod <vk...@kernel.org> > Sent: Tuesday, August 21, 2018 9:26 PM > To: Radhey Shyam Pandey <radh...@xilinx.com> > Cc: dan.j.willi...@intel.com; Michal Simek <mich...@xilinx.com>; Appana > Durga Kedareswara Rao <appa...@xilinx.com>; l...@metafoo.de; > dmaeng...@vger.kernel.org; linux-arm-ker...@lists.infradead.org; linux- > ker...@vger.kernel.org > Subject: Re: [PATCH 3/3] dmaengine: xilinx_dma: Fix 64-bit simple CDMA > transfer > > On 27-07-18, 16:20, Radhey Shyam Pandey wrote: > > In AXI CDMA simple mode also pass MSB bits of source and destination > > address to xilinx_write function. This fixes simple CDMA operation > > mode using 64-bit addressing. > > > > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pan...@xilinx.com> > > Signed-off-by: Michal Simek <michal.si...@xilinx.com> > > --- > > drivers/dma/xilinx/xilinx_dma.c | 6 ++++-- > > 1 files changed, 4 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/dma/xilinx/xilinx_dma.c > > b/drivers/dma/xilinx/xilinx_dma.c > > index a37871e..2e15d86 100644 > > --- a/drivers/dma/xilinx/xilinx_dma.c > > +++ b/drivers/dma/xilinx/xilinx_dma.c > > @@ -1245,8 +1245,10 @@ static void xilinx_cdma_start_transfer(struct > xilinx_dma_chan *chan) > > > > hw = &segment->hw; > > > > - xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, hw- > >src_addr); > > - xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, hw- > >dest_addr); > > + xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, > (dma_addr_t) > > + ((u64)hw->src_addr_msb << 32 | hw->src_addr)); > > so this is: > (dma_addr_t)((u64)hw->src_addr_msb << 32 | hw->src_addr) > > what is src_addr data type? I think its u32. It would be better to > update xilinx_write() to take u64 and not dma_addr_t.
Yes, src_addr_msb and src_addr BD fields are u32. To explain: There is no prob in xilinx_write it takes dma_addr_t as an arg which is 32/64 bit depending on _DMA_ADDR_T_64BIT. In 64bit CDMA transfer, there was a bug i.e in the call to xilinx_write src_addr_msb 32 bits were not passed. To fix that combine MSB and LSB 32 bits before passing it to xilinx_write. Thanks, Radhey > > > > + xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, > (dma_addr_t) > > + ((u64)hw->dest_addr_msb << 32 | hw- > >dest_addr)); > > > > /* Start the transfer */ > > dma_ctrl_write(chan, XILINX_DMA_REG_BTT, > > -- > > 1.7.1 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe dmaengine" in > > the body of a message to majord...@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > ~Vinod
