linux-kernel - Re: [PATCH v2 2/2] drm/komeda: Adds layer horizontal input size limitation check for D71

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Date:   Wed, 25 Sep 2019 11:25:40 +0100
From:   Liviu Dudau <Liviu.Dudau@....com>
To:     "Lowry Li (Arm Technology China)" <Lowry.Li@....com>
Cc:     "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        Mihail Atanassov <Mihail.Atanassov@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH v2 2/2] drm/komeda: Adds layer horizontal input size
 limitation check for D71

On Tue, Sep 24, 2019 at 08:00:49AM +0000, Lowry Li (Arm Technology China) wrote:
> From: "Lowry Li (Arm Technology China)" <Lowry.Li@....com>
> 
> Adds maximum line size check according to the AFBC decoder limitation
> and special Line size limitation(2046) for format: YUV420_10BIT and X0L2.
> 
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@....com>

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

Best regards,
Liviu

> ---
>  .../arm/display/komeda/d71/d71_component.c    | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> index 357837b9d6ed..6740b8422f11 100644
> --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> @@ -349,7 +349,56 @@ static void d71_layer_dump(struct komeda_component *c, struct seq_file *sf)
>  	seq_printf(sf, "%sAD_V_CROP:\t\t0x%X\n", prefix, v[2]);
>  }
>  
> +static int d71_layer_validate(struct komeda_component *c,
> +			      struct komeda_component_state *state)
> +{
> +	struct komeda_layer_state *st = to_layer_st(state);
> +	struct komeda_layer *layer = to_layer(c);
> +	struct drm_plane_state *plane_st;
> +	struct drm_framebuffer *fb;
> +	u32 fourcc, line_sz, max_line_sz;
> +
> +	plane_st = drm_atomic_get_new_plane_state(state->obj.state,
> +						  state->plane);
> +	fb = plane_st->fb;
> +	fourcc = fb->format->format;
> +
> +	if (drm_rotation_90_or_270(st->rot))
> +		line_sz = st->vsize - st->afbc_crop_t - st->afbc_crop_b;
> +	else
> +		line_sz = st->hsize - st->afbc_crop_l - st->afbc_crop_r;
> +
> +	if (fb->modifier) {
> +		if ((fb->modifier & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) ==
> +			AFBC_FORMAT_MOD_BLOCK_SIZE_32x8)
> +			max_line_sz = layer->line_sz;
> +		else
> +			max_line_sz = layer->line_sz / 2;
> +
> +		if (line_sz > max_line_sz) {
> +			DRM_DEBUG_ATOMIC("afbc request line_sz: %d exceed the max afbc line_sz: %d.\n",
> +					 line_sz, max_line_sz);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (fourcc == DRM_FORMAT_YUV420_10BIT && line_sz > 2046 && (st->afbc_crop_l % 4)) {
> +		DRM_DEBUG_ATOMIC("YUV420_10BIT input_hsize: %d exceed the max size 2046.\n",
> +				 line_sz);
> +		return -EINVAL;
> +	}
> +
> +	if (fourcc == DRM_FORMAT_X0L2 && line_sz > 2046 && (st->addr[0] % 16)) {
> +		DRM_DEBUG_ATOMIC("X0L2 input_hsize: %d exceed the max size 2046.\n",
> +				 line_sz);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct komeda_component_funcs d71_layer_funcs = {
> +	.validate	= d71_layer_validate,
>  	.update		= d71_layer_update,
>  	.disable	= d71_layer_disable,
>  	.dump_register	= d71_layer_dump,
> -- 
> 2.17.1
> 

-- 
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