Re: [RFC PATCH 3/4] drm/arm/malidp: Set the AFBC register bits if the framebuffer has AFBC modifier

From: Liviu Dudau
Date: Tue Jun 26 2018 - 09:17:25 EST

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Hi Ayan,

Thanks for the patch! I have some small comments to make:

On Fri, Jun 15, 2018 at 02:51:33PM +0100, Ayan Kumar Halder wrote:
> Added the AFBC decoder registers for DP500 , DP550 and DP650.
> These registers control the processing of AFBC buffers. It controls various
> features like AFBC decoder enable, lossless transformation and block split
> as well as setting of the left, right, top and bottom cropping of AFBC buffers
> (in number of pixels).
> All the layers (except DE_SMART) support framebuffers with AFBC modifiers.
> One needs to set the pixel values of the top, left, bottom and right cropping
> for the AFBC framebuffer.
> Added the functionality in malidp_de_plane_update() to set the various
> registers for AFBC decoder, depending on the modifiers.
>
> Signed-off-by: Ayan Kumar halder <ayan.halder@xxxxxxx>
> Reviewed-by: Brian Starkey <brian.starkey@xxxxxxx>
> ---
> drivers/gpu/drm/arm/malidp_hw.c | 27 ++++++++-----
> drivers/gpu/drm/arm/malidp_hw.h | 2 +
> drivers/gpu/drm/arm/malidp_planes.c | 81 +++++++++++++++++++++++++++++++++----
> drivers/gpu/drm/arm/malidp_regs.h | 20 +++++++++
> 4 files changed, 111 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
> index 4dbf39f..fd6b510 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.c
> +++ b/drivers/gpu/drm/arm/malidp_hw.c
> @@ -76,33 +76,38 @@ static const struct malidp_format_id malidp550_de_formats[] = {
>
> static const struct malidp_layer malidp500_layers[] = {
> { DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE,
> - MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, ROTATE_ANY },
> + MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, ROTATE_ANY,
> + MALIDP500_DE_LV_AD_CTRL },
> { DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE,
> - MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY },
> + MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY, MALIDP500_DE_LG1_AD_CTRL },
> { DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE,
> - MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY },
> + MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY, MALIDP500_DE_LG2_AD_CTRL },
> };
>
> static const struct malidp_layer malidp550_layers[] = {
> { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
> - MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY },
> + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY,
> + MALIDP550_DE_LV1_AD_CTRL },
> { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
> - MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY },
> + MALIDP_DE_LG_STRIDE, 0, ROTATE_ANY, MALIDP550_DE_LG_AD_CTRL },
> { DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
> - MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY },
> + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY,
> + MALIDP550_DE_LV2_AD_CTRL },
> { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
> - MALIDP550_DE_LS_R1_STRIDE, 0, ROTATE_NONE },
> + MALIDP550_DE_LS_R1_STRIDE, 0, ROTATE_NONE, 0 },
> };
>
> static const struct malidp_layer malidp650_layers[] = {
> { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
> - MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY },
> + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY,
> + MALIDP550_DE_LV1_AD_CTRL },
> { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
> - MALIDP_DE_LG_STRIDE, 0, ROTATE_COMPRESSED },
> + MALIDP_DE_LG_STRIDE, 0, ROTATE_COMPRESSED, MALIDP550_DE_LG_AD_CTRL },
> { DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
> - MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY },
> + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, ROTATE_ANY,
> + MALIDP550_DE_LV2_AD_CTRL },
> { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
> - MALIDP550_DE_LS_R1_STRIDE, 0, ROTATE_NONE },
> + MALIDP550_DE_LS_R1_STRIDE, 0, ROTATE_NONE, 0 },
> };
>
> #define SE_N_SCALING_COEFFS 96
> diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
> index 4390243..bbe6883 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.h
> +++ b/drivers/gpu/drm/arm/malidp_hw.h
> @@ -67,6 +67,8 @@ struct malidp_layer {
> u16 stride_offset; /* offset to the first stride register. */
> s16 yuv2rgb_offset; /* offset to the YUV->RGB matrix entries */
> enum rotation_features rot; /* type of rotation supported */
> + /* address offset for the AFBC decoder registers */
> + u16 afbc_decoder_offset;
> };
>
> enum malidp_scaling_coeff_set {
> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> index 533cdde..3950504 100644
> --- a/drivers/gpu/drm/arm/malidp_planes.c
> +++ b/drivers/gpu/drm/arm/malidp_planes.c
> @@ -330,6 +330,71 @@ static void malidp_de_set_color_encoding(struct malidp_plane *plane,
> }
> }
>
> +static void malidp_set_plane_base_addr(struct drm_framebuffer *fb,
> + struct malidp_plane *mp,
> + int plane_index)
> +{
> + dma_addr_t paddr;
> + u16 ptr;
> + struct drm_plane *plane = &mp->base;
> + bool afbc = fb->modifier ? true : false;

The decision to set afbc based on wether the fb has a modifier or not
seems a bit weak. Should we also (at least) check that the modifier is
an ARM one?

> +
> + ptr = mp->layer->ptr + (plane_index << 4);
> +
> + /*
> + * For AFBC buffers, cropping is handled by AFBC decoder rather than
> + * pointer manipulation.
> + */
> + if (!afbc) {
> + paddr = drm_fb_cma_get_gem_addr(fb, plane->state,
> + plane_index);
> + } else {
> + struct drm_gem_cma_object *obj;
> +
> + obj = drm_fb_cma_get_gem_obj(fb, plane_index);
> +
> + if (WARN_ON(!obj))
> + return;
> + paddr = obj->paddr;
> + }
> +
> + malidp_hw_write(mp->hwdev, lower_32_bits(paddr), ptr);
> + malidp_hw_write(mp->hwdev, upper_32_bits(paddr), ptr + 4);
> +}
> +
> +static void malidp_de_set_plane_afbc(struct drm_plane *plane)
> +{
> + struct malidp_plane *mp;
> + u32 src_w, src_h, val = 0, src_x, src_y;
> + struct drm_framebuffer *fb = plane->state->fb;
> +
> + mp = to_malidp_plane(plane);
> +
> + /* convert src values from Q16 fixed point to integer */
> + src_w = plane->state->src_w >> 16;
> + src_h = plane->state->src_h >> 16;
> + src_x = plane->state->src_x >> 16;
> + src_y = plane->state->src_y >> 16;
> +
> + val = ((fb->width - (src_x + src_w)) << MALIDP_AD_CROP_RIGHT_OFFSET) |
> + src_x;
> + malidp_hw_write(mp->hwdev, val,
> + mp->layer->afbc_decoder_offset + MALIDP_AD_CROP_H);
> +
> + val = ((fb->height - (src_y + src_h)) << MALIDP_AD_CROP_BOTTOM_OFFSET) |
> + src_y;
> + malidp_hw_write(mp->hwdev, val,
> + mp->layer->afbc_decoder_offset + MALIDP_AD_CROP_V);
> +
> + val = MALIDP_AD_EN;
> + if (fb->modifier & AFBC_FORMAT_MOD_SPLIT)
> + val |= MALIDP_AD_BS;
> + if (fb->modifier & AFBC_FORMAT_MOD_YTR)
> + val |= MALIDP_AD_YTR;
> +
> + malidp_hw_write(mp->hwdev, val, mp->layer->afbc_decoder_offset);
> +}
> +
> static void malidp_de_plane_update(struct drm_plane *plane,
> struct drm_plane_state *old_state)
> {
> @@ -338,6 +403,7 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> u32 src_w, src_h, dest_w, dest_h, val;
> int i;
> bool format_has_alpha = plane->state->fb->format->has_alpha;
> + struct drm_framebuffer *fb = plane->state->fb;
>
> mp = to_malidp_plane(plane);
>
> @@ -349,15 +415,9 @@ static void malidp_de_plane_update(struct drm_plane *plane,
>
> malidp_hw_write(mp->hwdev, ms->format, mp->layer->base);
>
> - for (i = 0; i < ms->n_planes; i++) {
> - /* calculate the offset for the layer's plane registers */
> - u16 ptr = mp->layer->ptr + (i << 4);
> - dma_addr_t fb_addr = drm_fb_cma_get_gem_addr(plane->state->fb,
> - plane->state, i);
> + for (i = 0; i < ms->n_planes; i++)
> + malidp_set_plane_base_addr(fb, mp, i);
>
> - malidp_hw_write(mp->hwdev, lower_32_bits(fb_addr), ptr);
> - malidp_hw_write(mp->hwdev, upper_32_bits(fb_addr), ptr + 4);
> - }
> malidp_de_set_plane_pitches(mp, ms->n_planes,
> plane->state->fb->pitches);
>
> @@ -381,6 +441,11 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> LAYER_H_VAL(src_w) | LAYER_V_VAL(src_h),
> mp->layer->base + MALIDP550_LS_R1_IN_SIZE);
>
> + if (fb->modifier)
> + malidp_de_set_plane_afbc(plane);
> + else
> + malidp_hw_write(mp->hwdev, 0, mp->layer->afbc_decoder_offset);

Given that you are testing for the non-zero value of fb->modifier inside
malidp_de_set_plane_afbc() function before setting the afbc_decoder
register value, I feel that you could take the 'else' branch from here
and merge it into malidp_de_set_plane_afbc() function (possibly also
rename it to malidp_de_set_plane).

With those small changes:

Reviewed-by: Liviu Dudau <liviu.dudau@xxxxxxx>

Best regards,
Liviu

> +
> /* first clear the rotation bits */
> val = malidp_hw_read(mp->hwdev, mp->layer->base + MALIDP_LAYER_CONTROL);
> val &= ~LAYER_ROT_MASK;
> diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
> index 149024f..54f4ec5 100644
> --- a/drivers/gpu/drm/arm/malidp_regs.h
> +++ b/drivers/gpu/drm/arm/malidp_regs.h
> @@ -180,10 +180,13 @@
> #define MALIDP500_LV_YUV2RGB ((s16)(-0xB8))
> #define MALIDP500_DE_LV_BASE 0x00100
> #define MALIDP500_DE_LV_PTR_BASE 0x00124
> +#define MALIDP500_DE_LV_AD_CTRL 0x00400
> #define MALIDP500_DE_LG1_BASE 0x00200
> #define MALIDP500_DE_LG1_PTR_BASE 0x0021c
> +#define MALIDP500_DE_LG1_AD_CTRL 0x0040c
> #define MALIDP500_DE_LG2_BASE 0x00300
> #define MALIDP500_DE_LG2_PTR_BASE 0x0031c
> +#define MALIDP500_DE_LG2_AD_CTRL 0x00418
> #define MALIDP500_SE_BASE 0x00c00
> #define MALIDP500_SE_CONTROL 0x00c0c
> #define MALIDP500_SE_PTR_BASE 0x00e0c
> @@ -208,10 +211,13 @@
> #define MALIDP550_LV_YUV2RGB 0x00084
> #define MALIDP550_DE_LV1_BASE 0x00100
> #define MALIDP550_DE_LV1_PTR_BASE 0x00124
> +#define MALIDP550_DE_LV1_AD_CTRL 0x001B8
> #define MALIDP550_DE_LV2_BASE 0x00200
> #define MALIDP550_DE_LV2_PTR_BASE 0x00224
> +#define MALIDP550_DE_LV2_AD_CTRL 0x002B8
> #define MALIDP550_DE_LG_BASE 0x00300
> #define MALIDP550_DE_LG_PTR_BASE 0x0031c
> +#define MALIDP550_DE_LG_AD_CTRL 0x00330
> #define MALIDP550_DE_LS_BASE 0x00400
> #define MALIDP550_DE_LS_PTR_BASE 0x0042c
> #define MALIDP550_DE_PERF_BASE 0x00500
> @@ -223,6 +229,20 @@
> #define MALIDP550_CONFIG_VALID 0x0c014
> #define MALIDP550_CONFIG_ID 0x0ffd4
>
> +/* AFBC register offsets relative to MALIDPXXX_DE_LX_AD_CTRL */
> +/* The following register offsets are common for DP500, DP550 and DP650 */
> +#define MALIDP_AD_CROP_H 0x4
> +#define MALIDP_AD_CROP_V 0x8
> +#define MALIDP_AD_END_PTR_LOW 0xc
> +#define MALIDP_AD_END_PTR_HIGH 0x10
> +
> +/* AFBC decoder Registers */
> +#define MALIDP_AD_EN BIT(0)
> +#define MALIDP_AD_YTR BIT(4)
> +#define MALIDP_AD_BS BIT(8)
> +#define MALIDP_AD_CROP_RIGHT_OFFSET 16
> +#define MALIDP_AD_CROP_BOTTOM_OFFSET 16
> +
> /*
> * Starting with DP550 the register map blocks has been standardised to the
> * following layout:
> --
> 2.7.4
>

--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
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