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Date:   Thu, 5 Jul 2018 14:31:47 +0100
From:   Ayan Halder <ayan.halder@arm.com>
To:     Liviu Dudau <Liviu.Dudau@foss.arm.com>
Cc:     airlied@linux.ie, liviu.dudau@arm.com,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        malidp@foss.arm.com, nd@arm.com
Subject: Re: [RFC PATCH 3/4] drm/arm/malidp: Set the AFBC register bits if
 the framebuffer has AFBC modifier
Message-ID: <20180705133147.GA31243@arm.com>
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On Tue, Jun 26, 2018 at 02:17:17PM +0100, Liviu Dudau wrote:
> 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@arm.com>
> > Reviewed-by: Brian Starkey <brian.starkey@arm.com>
> > ---
> >  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?

In my next patch (of this series) ie
https://patchwork.kernel.org/patch/10466537/, we have checked for the
validity of modifier and format in malidp_format_mod_supported(). When
drm_atomic_commit() is invoked, it first calls (indirectly via some
intermediate functions)
malidp_format_mod_supported() and then invokes
malidp_set_plane_base_addr(). So there is no way that an invalid
modifier could be passed to malidp_set_plane_base_addr(). If
malidp_format_mod_supported() returns error then drm_atomic_commit()
would return error too.
> 
> > +
> > +	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).

I am not exactly sure what you meant here. We are testing for the non
zero value of fb->modifier in malidp_de_plane_update(). If
fb->modifier is not zero, we set the afbc specific registers in
malidp_de_set_plane_afbc(). Thus, malidp_de_plane_update()  will
invoke malidp_de_set_plane_afbc() for setting afbc stuff and will
continue with the other register settings. I do not see a clear reason
to refactor this code.

> With those small changes:
> 
> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
> 
> 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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