On 30-08-18, 10:11, Andrea Merello wrote: > On Wed, Aug 29, 2018 at 10:12 AM Andrea Merello > <andrea.merello@xxxxxxxxx> wrote: > > > > On Mon, Aug 27, 2018 at 7:30 AM Vinod <vkoul@xxxxxxxxxx> wrote: > > > > > > On 02-08-18, 16:10, Andrea Merello wrote: > > > > > > s/cylic/cyclic in patch title > > > > OK > > > > > > Whenever a single or cyclic transaction is prepared, the driver > > > > could eventually split it over several SG descriptors in order > > > > to deal with the HW maximum transfer length. > > > > > > > > This could end up in DMA operations starting from a misaligned > > > > address. This seems fatal for the HW if DRE is not enabled. > > > > > > DRE? > > > > Stands for "Data Realignment Engine". I will add this string nearby > > the acronym.. > > > > > > > > > > This patch eventually adjusts the transfer size in order to make sure > > > > all operations start from an aligned address. > > > > > > > > Cc: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxxxxx> > > > > Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx> > > > > Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxxxxx> > > > > --- > > > > Changes in v2: > > > > - don't introduce copy_mask field, rather rely on already-esistent > > > > copy_align field. Suggested by Radhey Shyam Pandey > > > > - reword title > > > > Changes in v3: > > > > - fix bug introduced in v2: wrong copy size when DRE is enabled > > > > - use implementation suggested by Radhey Shyam Pandey > > > > Changes in v4: > > > > - rework on the top of 1/6 > > > > --- > > > > drivers/dma/xilinx/xilinx_dma.c | 22 ++++++++++++++++++---- > > > > 1 file changed, 18 insertions(+), 4 deletions(-) > > > > > > > > diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c > > > > index a3aaa0e34cc7..aaa6de8a70e4 100644 > > > > --- a/drivers/dma/xilinx/xilinx_dma.c > > > > +++ b/drivers/dma/xilinx/xilinx_dma.c > > > > @@ -954,15 +954,28 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan) > > > > > > > > /** > > > > * xilinx_dma_calc_copysize - Calculate the amount of data to copy > > > > + * @chan: Driver specific DMA channel > > > > * @size: Total data that needs to be copied > > > > * @done: Amount of data that has been already copied > > > > * > > > > * Return: Amount of data that has to be copied > > > > */ > > > > -static int xilinx_dma_calc_copysize(int size, int done) > > > > +static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan, > > > > + int size, int done) > > > > > > please align with opening brace > > > > OK > > Sorry for getting back on this. > I've checked it, but it seems already aligned with opening brace in > the original e-mail text I've sent. (4 tabs + 4 spaces). Okay, please see that code looks fine, I will check after I apply -- ~Vinod
