Re: [RFC v3 AFBC 04/12] drm/arm/malidp: Set the AFBC register bits if the framebuffer has AFBC modifier

From: Ayan Halder
Date: Fri Dec 14 2018 - 08:45:23 EST

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On Tue, Dec 04, 2018 at 04:50:51PM +0000, Liviu Dudau wrote:

Hi Liviu,

Please let me know if you agree with my comments. Then I will send a
v4 patch for this.
> On Mon, Dec 03, 2018 at 11:31:58AM +0000, Ayan 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.
> > Cropping an AFBC framebuffer is controlled by the AFBC crop registers.
> > In that case, the layer input size registers should be configured with
> > framebuffer's dimensions and not with drm_plane_state source width/height
> > values (which is used for non AFBC framebuffer to denote cropping).
> >
> > Changes from v1:
> > - Removed the "if (fb->modifier)" check from malidp_de_plane_update()
> > and added it in malidp_de_set_plane_afbc(). This will consolidate all the
> > AFBC specific register configurations in a single function ie
> > malidp_de_set_plane_afbc().
> >
> > Changes from v2:
> > - For AFBC framebuffer, layer input size register should be set to framebuffer's
> > width and height
> >
> > Signed-off-by: Ayan Kumar Halder <ayan.halder@xxxxxxx>
> > ---
> > drivers/gpu/drm/arm/malidp_hw.c | 25 +++++----
> > drivers/gpu/drm/arm/malidp_hw.h | 2 +
> > drivers/gpu/drm/arm/malidp_planes.c | 109 +++++++++++++++++++++++++++++++-----
> > drivers/gpu/drm/arm/malidp_regs.h | 20 +++++++
> > 4 files changed, 130 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
> > index b9bed11..87b7b12 100644
> > --- a/drivers/gpu/drm/arm/malidp_hw.c
> > +++ b/drivers/gpu/drm/arm/malidp_hw.c
> > @@ -94,11 +94,12 @@ static const struct malidp_layer malidp500_layers[] = {
> > * yuv2rgb matrix offset, mmu control register offset, rotation_features
> > */
> > { DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE,
> > - MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0, ROTATE_ANY },
> > + MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0, ROTATE_ANY,
> > + MALIDP500_DE_LV_AD_CTRL },
> > { DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE,
> > - MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
> > + MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY, MALIDP500_DE_LG1_AD_CTRL },
> > { DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE,
> > - MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
> > + MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY, MALIDP500_DE_LG2_AD_CTRL },
> > };
> >
> > static const struct malidp_layer malidp550_layers[] = {
> > @@ -106,13 +107,15 @@ static const struct malidp_layer malidp550_layers[] = {
> > * yuv2rgb matrix offset, mmu control register offset, rotation_features
> > */
> > { DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
> > - MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0, ROTATE_ANY },
> > + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0, ROTATE_ANY,
> > + MALIDP550_DE_LV1_AD_CTRL },
> > { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
> > - MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
> > + MALIDP_DE_LG_STRIDE, 0, 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, 0, ROTATE_ANY },
> > + MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0, ROTATE_ANY,
> > + MALIDP550_DE_LV2_AD_CTRL },
> > { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
> > - MALIDP550_DE_LS_R1_STRIDE, 0, 0, ROTATE_NONE },
> > + MALIDP550_DE_LS_R1_STRIDE, 0, 0, ROTATE_NONE, 0 },
> > };
> >
> > static const struct malidp_layer malidp650_layers[] = {
> > @@ -122,16 +125,16 @@ 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,
> > - MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY },
> > + MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY, MALIDP550_DE_LV1_AD_CTRL },
> > { DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
> > MALIDP_DE_LG_STRIDE, 0, MALIDP650_DE_LG_MMU_CTRL,
> > - ROTATE_COMPRESSED },
> > + 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,
> > - MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY },
> > + MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY, MALIDP550_DE_LV2_AD_CTRL },
> > { DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
> > MALIDP550_DE_LS_R1_STRIDE, 0, MALIDP650_DE_LS_MMU_CTRL,
> > - ROTATE_NONE },
> > + 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 40155e2..651558f 100644
> > --- a/drivers/gpu/drm/arm/malidp_hw.h
> > +++ b/drivers/gpu/drm/arm/malidp_hw.h
> > @@ -70,6 +70,8 @@ struct malidp_layer {
> > s16 yuv2rgb_offset; /* offset to the YUV->RGB matrix entries */
> > u16 mmu_ctrl_offset; /* offset to the MMU control register */
> > 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 c9a6d3e..cd60f73 100644
> > --- a/drivers/gpu/drm/arm/malidp_planes.c
> > +++ b/drivers/gpu/drm/arm/malidp_planes.c
> > @@ -592,6 +592,80 @@ static void malidp_de_set_mmu_control(struct malidp_plane *mp,
> > mp->layer->base + mp->layer->mmu_ctrl_offset);
> > }
> >
> > +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;
> > +
> > + ptr = mp->layer->ptr + (plane_index << 4);
> > +
> > + /*
> > + * For AFBC buffers, cropping is handled by AFBC decoder rather than
> > + * pointer manipulation.
> > + */
>
> I think this comment needs to go in malidp_de_plane_update, not in this function.
> This function only updates the plane's base address.
>
I will reword the comment like this if it sounds sane :-

drm_fb_cma_get_gem_addr() alters the physical base address of the framebuffer
as per the plane's src_x, src_y co-ordinates (ie to take care of source cropping).
For AFBC, this is not needed as the cropping is handled by _AD_CROP_H
and _AD_CROP_V registers.

> > + 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);
> > +
> > + /* no afbc_decoder_offset means AFBC is not supported on this plane */
> > + if (!mp->layer->afbc_decoder_offset)
> > + return;
> > +
> > + if (!fb->modifier) {
> > + malidp_hw_write(mp->hwdev, 0, mp->layer->afbc_decoder_offset);
> > + return;
> > + }
> > +
> > + /* 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)
> > {
> > @@ -600,30 +674,33 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> > struct drm_plane_state *state = plane->state;
> > u16 pixel_alpha = state->pixel_blend_mode;
> > u8 plane_alpha = state->alpha >> 8;
> > + bool format_has_alpha = state->fb->format->has_alpha;
> > u32 src_w, src_h, dest_w, dest_h, val;
> > int i;
> > + struct drm_framebuffer *fb = plane->state->fb;
> >
> > mp = to_malidp_plane(plane);
> >
> > - /* convert src values from Q16 fixed point to integer */
> > - src_w = state->src_w >> 16;
> > - src_h = state->src_h >> 16;
> > - dest_w = state->crtc_w;
> > - dest_h = state->crtc_h;
> > + /* For AFBC framebuffer, use the framebuffer width and height for configuring
> > + * layer input size register.
> > + */
> > + if (fb->modifier) {
> > + src_w = fb->width;
> > + src_h = fb->height;
> > + } else {
> > + /* convert src values from Q16 fixed point to integer */
> > + src_w = ms->base.src_w >> 16;
> > + src_h = ms->base.src_h >> 16;
> > + }
> > + dest_w = ms->base.crtc_w;
> > + dest_h = ms->base.crtc_h;
>
> These two lines above are equivalent to the last two lines you deleted. Why you need this change?
>
Agreed, I will remove this change.
> >
> > val = malidp_hw_read(mp->hwdev, mp->layer->base);
> > val = (val & ~LAYER_FORMAT_MASK) | ms->format;
> > malidp_hw_write(mp->hwdev, val, 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(state->fb,
> > - state, i);
> > -
> > - malidp_hw_write(mp->hwdev, lower_32_bits(fb_addr), ptr);
> > - malidp_hw_write(mp->hwdev, upper_32_bits(fb_addr), ptr + 4);
> > - }
> > + for (i = 0; i < ms->n_planes; i++)
> > + malidp_set_plane_base_addr(fb, mp, i);
> >
> > malidp_de_set_mmu_control(mp, ms);
> >
> > @@ -657,6 +734,8 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> > mp->layer->base + MALIDP550_LS_R1_IN_SIZE);
> > }
> >
> > + malidp_de_set_plane_afbc(plane);
>
> I feel like this function call should be done only if (fb->modifier) is
> true.
We need to call this function even is fb->modifier = 0. Please refer
to the following snippet in malidp_de_set_plane_afbc()

if (!fb->modifier) {
malidp_hw_write(mp->hwdev, 0, mp->layer->afbc_decoder_offset);
return;
}
I will prefer to keep all the AFBC register configuration in a single
function.

Thanks,
Ayan Kumar Halder
>
> > +
> > /* first clear the rotation bits */
> > val = malidp_hw_read(mp->hwdev, mp->layer->base + MALIDP_LAYER_CONTROL);
> > val &= ~LAYER_ROT_MASK;
> > @@ -674,7 +753,7 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> >
> > if (state->alpha != DRM_BLEND_ALPHA_OPAQUE) {
> > val |= LAYER_COMP_PLANE;
> > - } else if (state->fb->format->has_alpha) {
> > + } else if (format_has_alpha) {
>
> This change has nothing to do with AFBC, it should not be in this patch.
>
> > /* We only care about blend mode if the format has alpha */
> > switch (pixel_alpha) {
> > case DRM_MODE_BLEND_PREMULTI:
> > diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
> > index 7ce3e14..a0dd6e1 100644
> > --- a/drivers/gpu/drm/arm/malidp_regs.h
> > +++ b/drivers/gpu/drm/arm/malidp_regs.h
> > @@ -198,10 +198,13 @@
> > #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_MEMWRITE_OUT_SIZE 0x00c2c
> > @@ -228,10 +231,13 @@
> > #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
> > @@ -258,6 +264,20 @@
> > #define MALIDP_MMU_CTRL_PX_PS(x) (1 << (8 + (x)))
> > #define MALIDP_MMU_CTRL_PP_NUM_REQ(x) (((x) & 0x7f) << 12)
> >
> > +/* 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
> >
>
> Best regards,
> Liviu
>
>
> --
> ====================
> | I would like to |
> | fix the world, |
> | but they're not |
> | giving me the |
> \ source code! /
> ---------------
> ??\_(???)_/??
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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