Re: [PATCH v3 06/13] drm/mediatek: add RGB color format support for RDMA

[Stu Hsieh <stu.hsieh@mediatek.com>]

Hi, CK:

On Tue, 2018-08-07 at 11:01 +0800, CK Hu wrote:
> 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
> 
OK, I would add the comment about this naming in driver rdma.c and ovl.c

Regard,
Stu

> > +	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);
> 
>