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Date:   Tue, 4 Dec 2018 16:50:51 +0000
From:   Liviu Dudau <Liviu.Dudau@arm.com>
To:     Ayan Halder <Ayan.Halder@arm.com>
Cc:     Brian Starkey <Brian.Starkey@arm.com>,
        "malidp@foss.arm.com" <malidp@foss.arm.com>,
        "airlied@linux.ie" <airlied@linux.ie>,
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "maxime.ripard@bootlin.com" <maxime.ripard@bootlin.com>,
        "sean@poorly.run" <sean@poorly.run>,
        "maarten.lankhorst@linux.intel.com" 
        <maarten.lankhorst@linux.intel.com>,
        "corbet@lwn.net" <corbet@lwn.net>,
        "mchehab+samsung@kernel.org" <mchehab+samsung@kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "davem@davemloft.net" <davem@davemloft.net>,
        "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "nicolas.ferre@microchip.com" <nicolas.ferre@microchip.com>,
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        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        nd <nd@arm.com>
Subject: Re: [RFC v3 AFBC 04/12] drm/arm/malidp: Set the AFBC register bits
 if the framebuffer has AFBC modifier
Message-ID: <20181204165051.GL988@e110455-lin.cambridge.arm.com>
References: <1543836703-8491-1-git-send-email-ayan.halder@arm.com>
 <1543836703-8491-5-git-send-email-ayan.halder@arm.com>
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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@arm.com>
> ---
>  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.

> +	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?

>  
>  	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.

> +
>  	/* 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


-- 
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