Re: [PATCH v2 4/5] drm/mediatek: dpi/dsi: change the getting possible_crtc way

[Chun-Kuang Hu <chunkuang.hu@kernel.org>]

Hi, Frank:

Frank Wunderlich <frank-w@public-files.de> 於 2020年7月28日 週二 下午7:18寫道：

>
> From: Jitao Shi <jitao.shi@mediatek.com>
>
> [Detail]
> dpi/dsi get the possible_crtc by
> mtk_drm_find_possible_crtc_by_comp(*drm_dev, ddp_comp)
>

I would like more information of why do this patch. For example:

For current mediatek dsi encoder, its possible crtc is fixed in crtc
0, and mediatek dpi encoder's possible crtc is fixed in crtc 1. In
some SoC the possible crtc is not fixed in this case, so call
mtk_drm_find_possible_crtc_by_comp() to find out the correct possible
crtc.

Regards,
Chun-Kuang.

> Test: build pass and boot to logo
>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 3 ++-
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index d4f0fb7ad312..e43977015843 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -608,7 +608,8 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
>         drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
>
>         /* Currently DPI0 is fixed to be driven by OVL1 */
> -       dpi->encoder.possible_crtcs = BIT(1);
> +       dpi->encoder.possible_crtcs =
> +               mtk_drm_find_possible_crtc_by_comp(drm_dev, dpi->ddp_comp);
>
>         ret = drm_bridge_attach(&dpi->encoder, dpi->bridge, NULL, 0);
>         if (ret) {
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 270bf22c98fe..c31d9c12d4a9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -892,7 +892,8 @@ static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
>          * Currently display data paths are statically assigned to a crtc each.
>          * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
>          */
> -       dsi->encoder.possible_crtcs = 1;
> +       dsi->encoder.possible_crtcs =
> +               mtk_drm_find_possible_crtc_by_comp(drm, dsi->ddp_comp);
>
>         /* If there's a bridge, attach to it and let it create the connector */
>         if (dsi->bridge) {
> --
> 2.25.1
>