linux-kernel - Re: [PATCH v1 12/15] drm/mediatek: add layer number condition for RDMA to control plane

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Date:   Wed, 25 Jul 2018 11:02:50 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Stu Hsieh <stu.hsieh@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v1 12/15] drm/mediatek: add layer number condition for
 RDMA to control plane

Hi, Stu:

On Tue, 2018-07-24 at 16:17 +0800, Stu Hsieh wrote:
> This patch add layer number condition for RDMA to control plane
> 
> When plane init in crtc create,
> it use the number of OVL layer to init plane.
> That's OVL can read 4 memory address.
> 
> For mt2712 third ddp, it use RDMA to read memory.
> RDMA can read 1 memory address, so it just init one plane.
> 
> For compatibility, this patch use two define OVL_LAYER_NR and
> RDMA_LAYER_NR to distingush two difference HW engine.
> 
> Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 25 +++++++++++++++++--------
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.h |  2 ++
>  2 files changed, 19 insertions(+), 8 deletions(-)
> 

[...]

> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> index 9d9410c67ae9..b44fefadf14a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> @@ -18,7 +18,9 @@
>  #include "mtk_drm_ddp_comp.h"
>  #include "mtk_drm_plane.h"
>  
> +#define MAX_LAYER_NR	4
>  #define OVL_LAYER_NR	4
> +#define RDMA_LAYER_NR	1
>  #define MTK_LUT_SIZE	512
>  #define MTK_MAX_BPC	10
>  #define MTK_MIN_BPC	3

If the layer number is not fixed in '4', I would like to get this value
from component because in some SoC, OVL may have 6 layer. So add an
interface to get the max layer number and OVL, RDMA driver would return
the number for this SoC.

Regards,
CK