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SubjectRe: [PATCH v3 06/13] drm/mediatek: add RGB color format support for RDMA
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Hi, Stu:

On Mon, 2018-08-06 at 19:58 +0800, Stu Hsieh wrote:
> This patch add RGB color format support for RDMA,
> including RGB565, RGB888, RGBA8888 and ARGB8888.
>
> Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 41 ++++++++++++++++++++++++++++++++
> 1 file changed, 41 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> index 08866550740f..ba72d392dc27 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> @@ -35,6 +35,8 @@
> #define DISP_REG_RDMA_SIZE_CON_0 0x0014
> #define DISP_REG_RDMA_SIZE_CON_1 0x0018
> #define DISP_REG_RDMA_TARGET_LINE 0x001c
> +#define DISP_RDMA_MEM_CON 0x0024
> +#define MEM_MODE_INPUT_SWAP BIT(8)
> #define DISP_RDMA_MEM_SRC_PITCH 0x002c
> #define DISP_RDMA_MEM_GMC_SETTING_0 0x0030
> #define DISP_REG_RDMA_FIFO_CON 0x0040
> @@ -46,6 +48,11 @@
>
> #define RDMA_MEM_GMC 0x40402020
>
> +#define MEM_MODE_INPUT_FORMAT_RGB565 0x0
> +#define MEM_MODE_INPUT_FORMAT_RGB888 (0x001 << 4)
> +#define MEM_MODE_INPUT_FORMAT_RGBA8888 (0x002 << 4)
> +#define MEM_MODE_INPUT_FORMAT_ARGB8888 (0x003 << 4)
> +
> struct mtk_disp_rdma_data {
> unsigned int fifo_size;
> };
> @@ -144,12 +151,46 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
> writel(reg, comp->regs + DISP_REG_RDMA_FIFO_CON);
> }
>
> +static unsigned int rdma_fmt_convert(struct mtk_disp_rdma *rdma,
> + unsigned int fmt)
> +{
> + switch (fmt) {
> + default:
> + case DRM_FORMAT_RGB565:
> + return MEM_MODE_INPUT_FORMAT_RGB565;
> + case DRM_FORMAT_BGR565:
> + return MEM_MODE_INPUT_FORMAT_RGB565 | MEM_MODE_INPUT_SWAP;
> + case DRM_FORMAT_RGB888:
> + return MEM_MODE_INPUT_FORMAT_RGB888;
> + case DRM_FORMAT_BGR888:
> + return MEM_MODE_INPUT_FORMAT_RGB888 | MEM_MODE_INPUT_SWAP;
> + case DRM_FORMAT_RGBX8888:
> + case DRM_FORMAT_RGBA8888:
> + return MEM_MODE_INPUT_FORMAT_ARGB8888;

I think the alphabet order of the naming reflect the dram order for each
color. Of course, big-endian and little-endian would result in reversed
naming order. I could not understand why RDMA use ARGB8888 naming for
DRM RGBA8888. If the typo is from data sheet, I could just accept this
typo and give an explain in driver because I want to align driver with
data sheet.

Regards,
CK

> + case DRM_FORMAT_BGRX8888:
> + case DRM_FORMAT_BGRA8888:
> + return MEM_MODE_INPUT_FORMAT_ARGB8888 | MEM_MODE_INPUT_SWAP;
> + case DRM_FORMAT_XRGB8888:
> + case DRM_FORMAT_ARGB8888:
> + return MEM_MODE_INPUT_FORMAT_RGBA8888;
> + case DRM_FORMAT_XBGR8888:
> + case DRM_FORMAT_ABGR8888:
> + return MEM_MODE_INPUT_FORMAT_RGBA8888 | MEM_MODE_INPUT_SWAP;
> + }
> +}
> +
> static void mtk_rdma_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
> struct mtk_plane_state *state)
> {
> + struct mtk_disp_rdma *rdma = comp_to_rdma(comp);
> struct mtk_plane_pending_state *pending = &state->pending;
> unsigned int addr = pending->addr;
> unsigned int pitch = pending->pitch & 0xffff;
> + unsigned int fmt = pending->format;
> + unsigned int con;
> +
> + con = rdma_fmt_convert(rdma, fmt);
> + writel_relaxed(con, comp->regs + DISP_RDMA_MEM_CON);
>
> writel_relaxed(addr, comp->regs + DISP_RDMA_MEM_START_ADDR);
> writel_relaxed(pitch, comp->regs + DISP_RDMA_MEM_SRC_PITCH);


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