Re: [PATCH v9 4/9] dmaengine: dw-edma: Rename wr(rd)_ch_cnt to ll_wr(rd)_cnt in struct dw_edma_chip

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Sat, Apr 23, 2022 at 04:47:51PM -0500, Zhi Li wrote:
> On Sat, Apr 23, 2022 at 7:12 AM Manivannan Sadhasivam
> <manivannan.sadhasivam@linaro.org> wrote:
> >
> > On Fri, Apr 22, 2022 at 09:36:38AM -0500, Frank Li wrote:
> > > There are same name wr(rd)_ch_cnt in struct dw_edma. EDMA driver get
> > > write(read) channel number from register, then save these into dw_edma.
> > > Old wr(rd)_ch_cnt in dw_edma_chip actuall means how many link list memory
> > > are available in ll_region_wr(rd)[EDMA_MAX_WR_CH]. So rename it to
> > > ll_wr(rd)_cnt to indicate actual usage.
> > >
> > > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> >
> > One minor comment below,
> >
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> >
> > > Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
> > > ---
> > > Change from v6 to v9
> > >  - none
> > > Change from v5 to v6
> > >  - s/rename/Rename/ at subject
> > > new patch at v4
> > >
> > >  drivers/dma/dw-edma/dw-edma-core.c |  4 ++--
> > >  drivers/dma/dw-edma/dw-edma-pcie.c | 12 ++++++------
> > >  include/linux/dma/edma.h           |  8 ++++----
> > >  3 files changed, 12 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> > > index 435e4f2ab6575..1a0a98f6c5515 100644
> > > --- a/drivers/dma/dw-edma/dw-edma-core.c
> > > +++ b/drivers/dma/dw-edma/dw-edma-core.c
> > > @@ -919,11 +919,11 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> > >
> > >       raw_spin_lock_init(&dw->lock);
> > >
> > > -     dw->wr_ch_cnt = min_t(u16, chip->wr_ch_cnt,
> > > +     dw->wr_ch_cnt = min_t(u16, chip->ll_wr_cnt,
> > >                             dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE));
> > >       dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt, EDMA_MAX_WR_CH);
> > >
> > > -     dw->rd_ch_cnt = min_t(u16, chip->rd_ch_cnt,
> > > +     dw->rd_ch_cnt = min_t(u16, chip->ll_rd_cnt,
> > >                             dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ));
> > >       dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt, EDMA_MAX_RD_CH);
> > >
> > > diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
> > > index ae42bad24dd5a..7732537f96086 100644
> > > --- a/drivers/dma/dw-edma/dw-edma-pcie.c
> > > +++ b/drivers/dma/dw-edma/dw-edma-pcie.c
> > > @@ -230,14 +230,14 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
> > >       chip->nr_irqs = nr_irqs;
> > >       chip->ops = &dw_edma_pcie_core_ops;
> > >
> > > -     chip->wr_ch_cnt = vsec_data.wr_ch_cnt;
> > > -     chip->rd_ch_cnt = vsec_data.rd_ch_cnt;
> > > +     chip->ll_wr_cnt = vsec_data.wr_ch_cnt;
> > > +     chip->ll_rd_cnt = vsec_data.rd_ch_cnt;
> > >
> > >       chip->reg_base = pcim_iomap_table(pdev)[vsec_data.rg.bar];
> > >       if (!chip->reg_base)
> > >               return -ENOMEM;
> > >
> > > -     for (i = 0; i < chip->wr_ch_cnt; i++) {
> > > +     for (i = 0; i < chip->ll_wr_cnt; i++) {
> > >               struct dw_edma_region *ll_region = &chip->ll_region_wr[i];
> > >               struct dw_edma_region *dt_region = &chip->dt_region_wr[i];
> > >               struct dw_edma_block *ll_block = &vsec_data.ll_wr[i];
> > > @@ -262,7 +262,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
> > >               dt_region->sz = dt_block->sz;
> > >       }
> > >
> > > -     for (i = 0; i < chip->rd_ch_cnt; i++) {
> > > +     for (i = 0; i < chip->ll_rd_cnt; i++) {
> > >               struct dw_edma_region *ll_region = &chip->ll_region_rd[i];
> > >               struct dw_edma_region *dt_region = &chip->dt_region_rd[i];
> > >               struct dw_edma_block *ll_block = &vsec_data.ll_rd[i];
> > > @@ -302,7 +302,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
> > >               chip->reg_base);
> > >
> > >
> > > -     for (i = 0; i < chip->wr_ch_cnt; i++) {
> > > +     for (i = 0; i < chip->ll_wr_cnt; i++) {
> > >               pci_dbg(pdev, "L. List:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
> > >                       i, vsec_data.ll_wr[i].bar,
> > >                       vsec_data.ll_wr[i].off, chip->ll_region_wr[i].sz,
> > > @@ -314,7 +314,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
> > >                       chip->dt_region_wr[i].vaddr, &chip->dt_region_wr[i].paddr);
> > >       }
> > >
> > > -     for (i = 0; i < chip->rd_ch_cnt; i++) {
> > > +     for (i = 0; i < chip->ll_rd_cnt; i++) {
> > >               pci_dbg(pdev, "L. List:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
> > >                       i, vsec_data.ll_rd[i].bar,
> > >                       vsec_data.ll_rd[i].off, chip->ll_region_rd[i].sz,
> > > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
> > > index e9ce652b88233..c2039246fc08c 100644
> > > --- a/include/linux/dma/edma.h
> > > +++ b/include/linux/dma/edma.h
> > > @@ -40,8 +40,8 @@ enum dw_edma_map_format {
> > >   * @nr_irqs:          total dma irq number
> > >   * @ops                       DMA channel to IRQ number mapping
> > >   * @reg_base          DMA register base address
> > > - * @wr_ch_cnt                 DMA write channel number
> > > - * @rd_ch_cnt                 DMA read channel number
> > > + * @ll_wr_cnt                 DMA write link list number
> > > + * @ll_rd_cnt                 DMA read link list number
> >
> > DMA linked list write/read memory regions?
> 
> ll_wr_cnt is the counter of the DMA listed list.
> 
> Do you means
> 
> @ll_region_wr        DMA linked list write memory regions
> 

Sorry, I confused the terms here. But can you use "count" instead of "number"?

Thanks,
Mani

> best regards
> Frank Li
> 
> 
> >
> > Thanks,
> > Mani
> >
> > >   * @rg_region                 DMA register region
> > >   * @ll_region_wr      DMA descriptor link list memory for write channel
> > >   * @ll_region_rd      DMA descriptor link list memory for read channel
> > > @@ -56,8 +56,8 @@ struct dw_edma_chip {
> > >
> > >       void __iomem            *reg_base;
> > >
> > > -     u16                     wr_ch_cnt;
> > > -     u16                     rd_ch_cnt;
> > > +     u16                     ll_wr_cnt;
> > > +     u16                     ll_rd_cnt;
> > >       /* link list address */
> > >       struct dw_edma_region   ll_region_wr[EDMA_MAX_WR_CH];
> > >       struct dw_edma_region   ll_region_rd[EDMA_MAX_RD_CH];
> > > --
> > > 2.35.1
> > >