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SubjectRe: [PATCH v6, 13/14] drm/mediatek: add fifo_size into rdma private data
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Hi, Yongqiang:

On Thu, 2020-01-02 at 13:42 +0800, Yongqiang Niu wrote:
> On Thu, 2020-01-02 at 13:20 +0800, CK Hu wrote:
> > Hi, Yongqiang:
> >
> > On Thu, 2020-01-02 at 12:00 +0800, Yongqiang Niu wrote:
> > > the fifo size of rdma in mt8183 is different.
> > > rdma0 fifo size is 5k
> > > rdma1 fifo size is 2k
> > >
> > > Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> > > ---
> > > drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 21 ++++++++++++++++++++-
> > > 1 file changed, 20 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> > > index 405afef..691480b 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> > > @@ -62,6 +62,7 @@ struct mtk_disp_rdma {
> > > struct mtk_ddp_comp ddp_comp;
> > > struct drm_crtc *crtc;
> > > const struct mtk_disp_rdma_data *data;
> > > + u32 fifo_size;
> > > };
> > >
> > > static inline struct mtk_disp_rdma *comp_to_rdma(struct mtk_ddp_comp *comp)
> > > @@ -130,10 +131,16 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
> > > unsigned int threshold;
> > > unsigned int reg;
> > > struct mtk_disp_rdma *rdma = comp_to_rdma(comp);
> > > + u32 rdma_fifo_size;
> > >
> > > rdma_update_bits(comp, DISP_REG_RDMA_SIZE_CON_0, 0xfff, width);
> > > rdma_update_bits(comp, DISP_REG_RDMA_SIZE_CON_1, 0xfffff, height);
> > >
> > > + if (rdma->fifo_size)
> > > + rdma_fifo_size = rdma->fifo_size;
> > > + else
> > > + rdma_fifo_size = RDMA_FIFO_SIZE(rdma);
> > > +
> > > /*
> > > * Enable FIFO underflow since DSI and DPI can't be blocked.
> > > * Keep the FIFO pseudo size reset default of 8 KiB. Set the
> > > @@ -142,7 +149,7 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
> > > */
> > > threshold = width * height * vrefresh * 4 * 7 / 1000000;
> > > reg = RDMA_FIFO_UNDERFLOW_EN |
> > > - RDMA_FIFO_PSEUDO_SIZE(RDMA_FIFO_SIZE(rdma)) |
> > > + RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
> > > RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
> > > writel(reg, comp->regs + DISP_REG_RDMA_FIFO_CON);
> > > }
> > > @@ -284,6 +291,18 @@ static int mtk_disp_rdma_probe(struct platform_device *pdev)
> > > return comp_id;
> > > }
> > >
> > > + if (of_find_property(dev->of_node, "mediatek,rdma_fifo_size", &ret)) {
> >
> > "mediatek,rdma_fifo_size" does not exists in binding document.
> >
> > > + ret = of_property_read_u32(dev->of_node,
> > > + "mediatek,rdma_fifo_size",
> > > + &priv->fifo_size);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to get rdma fifo size\n");
> > > + return ret;
> > > + }
> > > +
> > > + priv->fifo_size *= SZ_1K;
> >
> > Why not define fifo_size in 'bytes' ?
> >
> > Regards,
> > CK
>
> this is align the definition of fifo_size in mtk_disp_rdma_data, it is
> SZ_1K,
> and the macro RDMA_FIFO_PSEUDO_SIZE calculated with SZ_1K

I mean why not set the fifo size in bytes in device tree. So you need
not to do '*= SZ_1K' here. I think unit of fifo size in kernel is byte.

Regards,
CK

> >
> > > + }
> > > +
> > > ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
> > > &mtk_disp_rdma_funcs);
> > > if (ret) {
> >
> >
>
>

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