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SubjectRe: [PATCH 13/28] drm/mediatek: add connection from RDMA0 to DSI3
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Hi, Stu:

On Wed, 2018-06-13 at 15:46 +0800, Stu Hsieh wrote:
> Hi, CK:
>
> On Wed, 2018-06-13 at 13:45 +0800, CK Hu wrote:
> > Hi, Stu:
> >
> > Two inline comment.
> >
> > On Mon, 2018-06-11 at 11:26 +0800, Stu Hsieh wrote:
> > > This patch add the connection from RDMA0 to DSI3
> > >
> > > Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> > > ---
> > > drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 4 ++++
> > > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 2 +-
> > > 2 files changed, 5 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > > index c08aed8dae44..fed1b5704355 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > > @@ -83,6 +83,7 @@
> > > #define GAMMA_MOUT_EN_RDMA1 0x1
> > > #define RDMA0_MOUT_DPI0 0x2
> > > #define RDMA0_MOUT_DSI2 0x4
> > > +#define RDMA0_MOUT_DSI3 0x5
> >
> > Usually, each bit of a mout register represent a output enable. Is this
> > value 0x5 is a correct value?
>
> In hw CONFIG SPEC show as following:
> Bit(s) Name Description
> 2:0 DISP_PATH0_SOUT_SEL_IN 0 : Output to DSI0
> 1: Ooutput to DSI1
> 2: Ooutput to DPI
> 3: Ooutput to DPI1
> 4: Ooutput to DSI2
> 5: Ooutput to DSI3
> 6 : reserved
> 7: Ooutput to DISP_UFOE
> So, the value 0x5 is correct value.
>

From the definition, it looks like that RDMA0 could only single output
(output to only one destination at one moment). The register naming
'DISP_REG_CONFIG_DISP_RDMA0_MOUT_EN' (MOUT means output to multiple
destination simultaneously) would confuse me. If the data sheet use the
confused naming, I think I could just accept it.

Regards,
CK

> Regard,
> Stu
>
> >
> > > #define RDMA1_MOUT_DPI0 0x2
> > > #define DPI0_SEL_IN_RDMA1 0x1
> > > #define COLOR1_SEL_IN_OVL1 0x1
> > > @@ -164,6 +165,9 @@ static unsigned int mtk_ddp_mout_en(enum mtk_ddp_comp_id cur,
> > > } else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI2) {
> > > *addr = DISP_REG_CONFIG_DISP_RDMA0_MOUT_EN;
> > > value = RDMA0_MOUT_DSI2;
> > > + } else if (cur == DDP_COMPONENT_RDMA0 && next == DDP_COMPONENT_DSI3) {
> > > + *addr = DISP_REG_CONFIG_DISP_RDMA0_MOUT_EN;
> > > + value = RDMA0_MOUT_DSI3;
> > > } else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
> > > *addr = DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN;
> > > value = RDMA1_MOUT_DPI0;
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > index fe6fdc021fc7..22f4c72fa785 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> > > @@ -228,7 +228,7 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> > > [DDP_COMPONENT_DSI0] = { MTK_DSI, 0, NULL },
> > > [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, NULL },
> > > [DDP_COMPONENT_DSI2] = { MTK_DSI, 2, NULL },
> > > - [DDP_COMPONENT_DSI2] = { MTK_DSI, 3, NULL },
> > > + [DDP_COMPONENT_DSI3] = { MTK_DSI, 3, NULL },
> >
> > I think this is not related to this patch.
> OK
>
> >
> > Regards,
> > CK
> >
> > > [DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, &ddp_gamma },
> > > [DDP_COMPONENT_OD0] = { MTK_DISP_OD, 0, &ddp_od },
> > > [DDP_COMPONENT_OD1] = { MTK_DISP_OD, 1, &ddp_od },
> >
> >
>
>


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