linux-kernel - Re: [PATCH v2] drm/mediatek: Support UYVY and YUYV format for overlay

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Date:   Tue, 3 Jan 2017 14:27:37 +0800
From:   Daniel Kurtz <djkurtz@...omium.org>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Cawa Cheng <cawa.cheng@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        YT Shen <yt.shen@...iatek.com>,
        Thierry Reding <thierry.reding@...il.com>,
        CK Hu <ck.hu@...iatek.com>, Mao Huang <littlecvr@...omium.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v2] drm/mediatek: Support UYVY and YUYV format for overlay

On Fri, Dec 30, 2016 at 2:26 PM, Bibby Hsieh <bibby.hsieh@...iatek.com> wrote:
>
> MT8173 overlay can support UYVY and YUYV format,
> we add the format in DRM driver.
>
> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
> Reviewed-by: Daniel Kurtz <djkurtz@...omium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c  | 21 +++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c |  2 ++
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index c703102..de05845 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -40,10 +40,13 @@
>  #define        OVL_RDMA_MEM_GMC        0x40402020
>
>  #define OVL_CON_BYTE_SWAP      BIT(24)
> +#define OVL_CON_MTX_YUV_TO_RGB (6 << 16)
>  #define OVL_CON_CLRFMT_RGB565  (0 << 12)
>  #define OVL_CON_CLRFMT_RGB888  (1 << 12)
>  #define OVL_CON_CLRFMT_RGBA8888        (2 << 12)
>  #define OVL_CON_CLRFMT_ARGB8888        (3 << 12)
> +#define OVL_CON_CLRFMT_UYVY    (4 << 12)
> +#define OVL_CON_CLRFMT_YUYV    (5 << 12)

Why not just add " | OVL_CON_MTX_YUV_TO_RGB" here in the definition of
these two constants, instead of adding a helper function?

>  #define        OVL_CON_AEN             BIT(8)
>  #define        OVL_CON_ALPHA           0xff
>
> @@ -162,6 +165,21 @@ static unsigned int ovl_fmt_convert(unsigned int fmt)
>         case DRM_FORMAT_XBGR8888:
>         case DRM_FORMAT_ABGR8888:
>                 return OVL_CON_CLRFMT_RGBA8888 | OVL_CON_BYTE_SWAP;
> +       case DRM_FORMAT_UYVY:
> +               return OVL_CON_CLRFMT_UYVY;
> +       case DRM_FORMAT_YUYV:
> +               return OVL_CON_CLRFMT_YUYV;
> +       }
> +}
> +
> +static bool ovl_yuv_space(unsigned int fmt)
> +{
> +       switch (fmt) {
> +       case DRM_FORMAT_UYVY:
> +       case DRM_FORMAT_YUYV:
> +               return true;
> +       default:
> +               return false;
>         }
>  }
>
> @@ -183,6 +201,9 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
>         if (idx != 0)
>                 con |= OVL_CON_AEN | OVL_CON_ALPHA;
>
> +       if (ovl_yuv_space(fmt))
> +               con |= OVL_CON_MTX_YUV_TO_RGB;
> +
>         writel_relaxed(con, comp->regs + DISP_REG_OVL_CON(idx));
>         writel_relaxed(pitch, comp->regs + DISP_REG_OVL_PITCH(idx));
>         writel_relaxed(src_size, comp->regs + DISP_REG_OVL_SRC_SIZE(idx));
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index c461a23..8c02d1d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -28,6 +28,8 @@
>         DRM_FORMAT_XRGB8888,
>         DRM_FORMAT_ARGB8888,
>         DRM_FORMAT_RGB565,
> +       DRM_FORMAT_UYVY,
> +       DRM_FORMAT_YUYV,
>  };
>
>  static void mtk_plane_reset(struct drm_plane *plane)
> --
> 1.9.1
>