On Sat, Apr 23, 2022 at 7:12 AM Manivannan Sadhasivam
<manivannan.sadhasivam@xxxxxxxxxx> 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@xxxxxxx>
>
> One minor comment below,
>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
>
> > Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> > ---
> > 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
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
> >
