On Tue, 2021-01-12 at 07:59 +0800, Chun-Kuang Hu wrote:
> Hi, Yongqiang:
>
> Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> 於 2021年1月11日 週一 下午3:44寫道：
> >
> > enable OVL_LAYER_SMI_ID_EN for multi-layer usecase
>
> Could you describe more information? Without this patch, what would happen?
>
without this patch, ovl will hang up when more than 1 layer enabled
> >
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 12 ++++++++++++
> > 1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > index b47c238..4934bee 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > @@ -23,6 +23,7 @@
> > #define DISP_REG_OVL_RST 0x0014
> > #define DISP_REG_OVL_ROI_SIZE 0x0020
> > #define DISP_REG_OVL_DATAPATH_CON 0x0024
> > +#define OVL_LAYER_SMI_ID_EN BIT(0)
> > #define OVL_BGCLR_SEL_IN BIT(2)
> > #define DISP_REG_OVL_ROI_BGCLR 0x0028
> > #define DISP_REG_OVL_SRC_CON 0x002c
> > @@ -61,6 +62,7 @@ struct mtk_disp_ovl_data {
> > unsigned int gmc_bits;
> > unsigned int layer_nr;
> > bool fmt_rgb565_is_0;
> > + bool smi_id_en;
> > };
> >
> > /**
> > @@ -116,7 +118,17 @@ static void mtk_ovl_disable_vblank(struct mtk_ddp_comp *comp)
> >
> > static void mtk_ovl_start(struct mtk_ddp_comp *comp)
> > {
> > + struct mtk_disp_ovl *ovl = comp_to_ovl(comp);
> > +
> > writel_relaxed(0x1, comp->regs + DISP_REG_OVL_EN);
> > +
> > + if(ovl->data->smi_id_en) {
> > + unsigned int reg;
> > +
> > + reg = readl(comp->regs + DISP_REG_OVL_DATAPATH_CON);
> > + reg = reg | OVL_LAYER_SMI_ID_EN;
> > + writel_relaxed(reg, comp->regs + DISP_REG_OVL_DATAPATH_CON);
>
> I think this setting should before write 1 to DISP_REG_OVL_EN.
>
> > + }
> > }
> >
> > static void mtk_ovl_stop(struct mtk_ddp_comp *comp)
>
> Should clear DISP_REG_OVL_DATAPATH_CON when stop?
>
> Regards,
> Chun-Kuang.
>
> > --
> > 1.8.1.1.dirty
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
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