Re: [linux-sunxi] [PATCH 11/27] drm/sun4i: Rework DE2 register defines

[Chen-Yu Tsai]

Hi,

On Sun, Sep 2, 2018 at 3:27 PM Jernej Skrabec <jernej.skrabec@xxxxxxxx> wrote:
>
> Most, if not all, registers found in DE2 still exists in DE3. However,
> units are on different base addresses.
>
> To prepare for addition of DE3 support, registers macros are reworked so
> they take base address as parameter.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
> [rebased]
> Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx>

This patch mostly checks out. But see below.


> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> index 406c42e752d7..020b0a097c84 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> @@ -29,20 +29,24 @@
>
>  #define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE                BIT(0)
>
> -#define SUN8I_MIXER_BLEND_PIPE_CTL             0x1000
> -#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)       (0x1004 + 0x10 * (x) + 0x0)
> -#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)       (0x1004 + 0x10 * (x) + 0x4)
> -#define SUN8I_MIXER_BLEND_ATTR_COORD(x)                (0x1004 + 0x10 * (x) + 0x8)
> -#define SUN8I_MIXER_BLEND_ROUTE                        0x1080
> -#define SUN8I_MIXER_BLEND_PREMULTIPLY          0x1084
> -#define SUN8I_MIXER_BLEND_BKCOLOR              0x1088
> -#define SUN8I_MIXER_BLEND_OUTSIZE              0x108c
> -#define SUN8I_MIXER_BLEND_MODE(x)              (0x1090 + 0x04 * (x))
> -#define SUN8I_MIXER_BLEND_CK_CTL               0x10b0
> -#define SUN8I_MIXER_BLEND_CK_CFG               0x10b4
> -#define SUN8I_MIXER_BLEND_CK_MAX(x)            (0x10c0 + 0x04 * (x))
> -#define SUN8I_MIXER_BLEND_CK_MIN(x)            (0x10e0 + 0x04 * (x))
> -#define SUN8I_MIXER_BLEND_OUTCTL               0x10fc
> +#define DE2_BLD_BASE                           0x1000
> +#define DE2_CH_BASE                            0x2000
> +#define DE2_CH_SIZE                            0x1000
> +
> +#define SUN8I_MIXER_BLEND_PIPE_CTL(base)       ((base) + 0)
> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(base, x) ((base) + 0x4 + 0x10 * (x))
> +#define SUN8I_MIXER_BLEND_ATTR_INSIZE(base, x) ((base) + 0x8 + 0x10 * (x))
> +#define SUN8I_MIXER_BLEND_ATTR_COORD(base, x)  ((base) + 0xC + 0x10 * (x))

Nit: Use lowercase for '0xC' to be consistent.

> +#define SUN8I_MIXER_BLEND_ROUTE(base)          ((base) + 0x80)
> +#define SUN8I_MIXER_BLEND_PREMULTIPLY(base)    ((base) + 0x84)
> +#define SUN8I_MIXER_BLEND_BKCOLOR(base)                ((base) + 0x88)
> +#define SUN8I_MIXER_BLEND_OUTSIZE(base)                ((base) + 0x8c)
> +#define SUN8I_MIXER_BLEND_MODE(base, x)                ((base) + 0x90 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_CTL(base)         ((base) + 0xb0)
> +#define SUN8I_MIXER_BLEND_CK_CFG(base)         ((base) + 0xb4)
> +#define SUN8I_MIXER_BLEND_CK_MAX(base, x)      ((base) + 0xc0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_MIN(base, x)      ((base) + 0xe0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_OUTCTL(base)         ((base) + 0xfc)
>
>  #define SUN8I_MIXER_BLEND_PIPE_CTL_EN_MSK      GENMASK(12, 8)
>  #define SUN8I_MIXER_BLEND_PIPE_CTL_EN(pipe)    BIT(8 + pipe)

[...]

> diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
> index 6bb2aa164c8e..c68eab8a748f 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
> @@ -10,6 +10,7 @@
>   */
>
>  #include "sun8i_ui_scaler.h"
> +#include "sun8i_vi_scaler.h"
>
>  static const u32 lan2coefftab16[240] = {
>         0x00004000, 0x00033ffe, 0x00063efc, 0x000a3bfb,
> @@ -88,6 +89,14 @@ static const u32 lan2coefftab16[240] = {
>         0x0b1c1603, 0x0d1c1502, 0x0e1d1401, 0x0f1d1301,
>  };
>
> +static inline u32 sun8i_ui_scaler_base(struct sun8i_mixer *mixer, int channel)

I recently saw a review comment stating one should not inline functions
unless they are defined in header files. Otherwise the decision should
be left up to the compiler.

> +{
> +       int vi_num = mixer->cfg->vi_num;
> +
> +       return DE2_VI_SCALER_BASE + DE2_VI_SCALER_SIZE * vi_num +
> +              DE2_UI_SCALER_SIZE * (channel - vi_num);
> +}
> +
>  static int sun8i_ui_scaler_coef_index(unsigned int step)
>  {
>         unsigned int scale, int_part, float_part;

[...]

> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
> index d3f1acb234b7..8697afc36023 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
> @@ -833,6 +833,11 @@ static const u32 bicubic4coefftab32[480] = {
>         0x1012110d, 0x1012110d, 0x1013110c, 0x1013110c,
>  };
>
> +static inline u32 sun8i_vi_scaler_base(struct sun8i_mixer *mixer, int channel)
> +{
> +       return DE2_VI_SCALER_BASE + DE2_VI_SCALER_SIZE * channel;
> +}
> +

This one as well.

>  static int sun8i_vi_scaler_coef_index(unsigned int step)
>  {
>         unsigned int scale, int_part, float_part;
> @@ -857,7 +862,7 @@ static int sun8i_vi_scaler_coef_index(unsigned int step)
>         }
>  }
>
> -static void sun8i_vi_scaler_set_coeff(struct regmap *map, int layer,
> +static void sun8i_vi_scaler_set_coeff(struct regmap *map, u32 base,
>                                       u32 hstep, u32 vstep,
>                                       const struct drm_format_info *format)

This is the only instance where a function's "layer" parameter was changed
to "base". It would be nice if it were consistent.

ChenYu