[PATCH v11, 01/19] media: mtk-vcodec: Get numbers of register bases from DT

[yunfei.dong at mediatek.com]

Hi Steve,
Thanks for your suggestion.On Wed, 2021-12-01 at 15:36 -0800, Steve Cho
wrote:
> LGTM with few nits. 
> 
> Thanks,Steve
> 
> On Sun, Nov 28, 2021 at 7:44 PM Yunfei Dong <yunfei.dong at mediatek.com
> > wrote:
> > Different platform may has different numbers of register bases.
> > Gets the
> > 
> > numbers of register bases from DT (sizeof(u32) * 4 bytes for each)
> Few nits.
> s/platform/platforms/
> s/has/have/
> 
> Fix, DT is dts.
> Btw, what is DT?
> >  
> > 
> > Reviewed-by: Tzung-Bi Shih<tzungbi at google.com>
> > 
> > Signed-off-by: Yunfei Dong <yunfei.dong at mediatek.com>
> > 
> > ---
> > 
> >  .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c  | 37 ++++++++++++++-
> > ----
> > 
> >  1 file changed, 28 insertions(+), 9 deletions(-)
> > 
> > 
> > 
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c 
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > 
> > index e6e6a8203eeb..59caf2163349 100644
> > 
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > 
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > 
> > @@ -78,6 +78,30 @@ static irqreturn_t
> > mtk_vcodec_dec_irq_handler(int irq, void *priv)
> > 
> >         return IRQ_HANDLED;
> > 
> >  }
> > 
> > 
> > 
> > +static int mtk_vcodec_get_reg_bases(struct mtk_vcodec_dev *dev)
> > 
> > +{
> I see that dev is already checked before entering into this function,
> but null check for dev would still be nice. 
>  
Dev is never null in this function, whether it looks not very
reasonable?
Best Regards,Yunfei Dong
> > +       struct platform_device *pdev = dev->plat_dev;
> > 
> > +       int reg_num, i;
> > 
> > +
> > 
> > +       /* Sizeof(u32) * 4 bytes for each register base. */
> > 
> > +       reg_num = of_property_count_elems_of_size(pdev-
> > >dev.of_node, "reg",
> > 
> > +               sizeof(u32) * 4);
> > 
> > +       if (reg_num <= 0 || reg_num > NUM_MAX_VDEC_REG_BASE) {
> > 
> > +               dev_err(&pdev->dev, "Invalid register property
> > size: %d\n", reg_num);
> > 
> > +               return -EINVAL;
> > 
> > +       }
> > 
> > +
> > 
> > +       for (i = 0; i < reg_num; i++) {
> > 
> > +               dev->reg_base[i] =
> > devm_platform_ioremap_resource(pdev, i);
> > 
> > +               if (IS_ERR(dev->reg_base[i]))
> > 
> > +                       return PTR_ERR(dev->reg_base[i]);
> > 
> > +
> > 
> > +               mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev-
> > >reg_base[i]);
> > 
> > +       }
> > 
> > +
> > 
> > +       return 0;
> > 
> > +}
> > 
> > +
> > 
> >  static int fops_vcodec_open(struct file *file)
> > 
> >  {
> > 
> >         struct mtk_vcodec_dev *dev = video_drvdata(file);
> > 
> > @@ -206,7 +230,7 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> > 
> >         struct resource *res;
> > 
> >         phandle rproc_phandle;
> > 
> >         enum mtk_vcodec_fw_type fw_type;
> > 
> > -       int i, ret;
> > 
> > +       int ret;
> > 
> > 
> > 
> >         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> > 
> >         if (!dev)
> > 
> > @@ -238,14 +262,9 @@ static int mtk_vcodec_probe(struct
> > platform_device *pdev)
> > 
> >                 goto err_dec_pm;
> > 
> >         }
> > 
> > 
> > 
> > -       for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
> > 
> > -               dev->reg_base[i] =
> > devm_platform_ioremap_resource(pdev, i);
> > 
> > -               if (IS_ERR((__force void *)dev->reg_base[i])) {
> > 
> > -                       ret = PTR_ERR((__force void *)dev-
> > >reg_base[i]);
> > 
> > -                       goto err_res;
> > 
> > -               }
> > 
> > -               mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev-
> > >reg_base[i]);
> > 
> > -       }
> > 
> > +       ret = mtk_vcodec_get_reg_bases(dev);
> > 
> > +       if (ret)
> > 
> > +               goto err_res;
> > 
> > 
> > 
> >         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > 
> >         if (res == NULL) {
> > 
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