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Date:   Thu, 5 Jul 2018 14:45:12 +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 4/4] drm/arm/malidp: Added support for AFBC modifiers
 for all layers except DE_SMART
Message-ID: <20180705134512.GB31243@arm.com>
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On Tue, Jun 26, 2018 at 02:21:58PM +0100, Liviu Dudau wrote:
> On Fri, Jun 15, 2018 at 02:51:34PM +0100, Ayan Kumar Halder wrote:
> > On planes which support AFBC, expose an AFBC modifier for use with BGR888.
> > 
> > Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com>
> > Reviewed-by: Brian Starkey <brian.starkey@arm.com>
> > 
> > Change-Id: I4739ff55c0f6d5715b268cb3947ed133a9ee7c2e
> 
> Please remove the Change-Id
> 
> > ---
> >  drivers/gpu/drm/arm/malidp_drv.c    |  1 +
> >  drivers/gpu/drm/arm/malidp_planes.c | 46 +++++++++++++++++++++++++++++++++++--
> >  2 files changed, 45 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index 7b6a848..7bcd679 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -392,6 +392,7 @@ static int malidp_init(struct drm_device *drm)
> >  	drm->mode_config.max_height = hwdev->max_line_size;
> >  	drm->mode_config.funcs = &malidp_mode_config_funcs;
> >  	drm->mode_config.helper_private = &malidp_mode_config_helpers;
> > +	drm->mode_config.allow_fb_modifiers = true;
> >  
> >  	ret = malidp_crtc_init(drm);
> >  	if (ret) {
> > diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> > index 3950504..55c9a1f6 100644
> > --- a/drivers/gpu/drm/arm/malidp_planes.c
> > +++ b/drivers/gpu/drm/arm/malidp_planes.c
> > @@ -124,6 +124,35 @@ static void malidp_plane_atomic_print_state(struct drm_printer *p,
> >  	drm_printf(p, "\tn_planes=%u\n", ms->n_planes);
> >  }
> >  
> > +static bool malidp_format_mod_supported(struct drm_plane *plane,
> > +					u32 format, u64 modifier)
> > +{
> > +	if (WARN_ON(modifier == DRM_FORMAT_MOD_INVALID))
> > +		return false;
> > +
> > +	/* All the pixel formats are supported without any modifier */
> > +	if (modifier == DRM_FORMAT_MOD_LINEAR)
> > +		return true;
> > +
> > +	if ((modifier >> 56) != DRM_FORMAT_MOD_VENDOR_ARM)
> > +		return false;
> > +
> > +	if (modifier &
> > +	    ~DRM_FORMAT_MOD_ARM_AFBC(AFBC_MOD_VALID_BITS)) {
> > +		DRM_ERROR("Unsupported modifiers\n");
> 
> I don't think we should polute the kernel log buffers with this. Maybe a
> DRM_DEBUG() if you really want to get some notification?

I agree with you completely. I think we should use DRM_DEBUG_KMS()
like intel_framebuffer_init() uses to log unsupported formats and
modifiers.
I will send a v2 patch for this.
> 
> With those changes added:
> 
> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
> 
> Best regards,
> Liviu
> 
> > +		return false;
> > +	}
> > +
> > +	switch (modifier) {
> > +	case DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 |
> > +				AFBC_FORMAT_MOD_YTR |
> > +				AFBC_FORMAT_MOD_SPARSE):
> > +		if (format == DRM_FORMAT_BGR888)
> > +			return true;
> > +	}
> > +	return false;
> > +}
> > +
> >  static const struct drm_plane_funcs malidp_de_plane_funcs = {
> >  	.update_plane = drm_atomic_helper_update_plane,
> >  	.disable_plane = drm_atomic_helper_disable_plane,
> > @@ -132,6 +161,7 @@ static const struct drm_plane_funcs malidp_de_plane_funcs = {
> >  	.atomic_duplicate_state = malidp_duplicate_plane_state,
> >  	.atomic_destroy_state = malidp_destroy_plane_state,
> >  	.atomic_print_state = malidp_plane_atomic_print_state,
> > +	.format_mod_supported = malidp_format_mod_supported,
> >  };
> >  
> >  static int malidp_se_check_scaling(struct malidp_plane *mp,
> > @@ -524,6 +554,13 @@ int malidp_de_planes_init(struct drm_device *drm)
> >  	u32 *formats;
> >  	int ret, i, j, n;
> >  
> > +	static const u64 modifiers[] = {
> > +		DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 |
> > +			AFBC_FORMAT_MOD_YTR | AFBC_FORMAT_MOD_SPARSE),
> > +		DRM_FORMAT_MOD_LINEAR,
> > +		DRM_FORMAT_MOD_INVALID
> > +	};
> > +
> >  	formats = kcalloc(map->n_pixel_formats, sizeof(*formats), GFP_KERNEL);
> >  	if (!formats) {
> >  		ret = -ENOMEM;
> > @@ -547,9 +584,14 @@ int malidp_de_planes_init(struct drm_device *drm)
> >  
> >  		plane_type = (i == 0) ? DRM_PLANE_TYPE_PRIMARY :
> >  					DRM_PLANE_TYPE_OVERLAY;
> > +
> > +		/*
> > +		 * All the layers except smart layer supports AFBC modifiers.
> > +		 */
> >  		ret = drm_universal_plane_init(drm, &plane->base, crtcs,
> > -					       &malidp_de_plane_funcs, formats,
> > -					       n, NULL, plane_type, NULL);
> > +				&malidp_de_plane_funcs, formats, n,
> > +				(id == DE_SMART) ? NULL : modifiers, plane_type, NULL);
> > +
> >  		if (ret < 0)
> >  			goto cleanup;
> >  
> > -- 
> > 2.7.4
> > 
> 
> -- 
> ====================
> | I would like to |
> | fix the world,  |
> | but they're not |
> | giving me the   |
>  \ source code!  /
>   ---------------
>     ??\_(???)_/??
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