Re: [PATCH 2/2] drm/msm/dpu: fix for cursor blend issue

[Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>]

On Tue, Aug 21, 2018 at 05:54:10PM +0530, Sravanthi Kollukuduru wrote:
> The current driver has the opaque blend mode set as the
> default causing the black box effect around the cursor.
> The fix enables choosing a different blend mode for alpha
> enabled formats.
> 
> Signed-off-by: Sravanthi Kollukuduru <skolluku@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 26 +++++++++++++++++++++-----
>  1 file changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 0cd9456a6c4c..fc6200c74614 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -297,14 +297,29 @@ static void dpu_crtc_destroy(struct drm_crtc *crtc)
>  }
>  
>  static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
> -		struct dpu_plane_state *pstate)
> +		struct dpu_plane_state *pstate, struct dpu_format *format)
>  {
>  	struct dpu_hw_mixer *lm = mixer->hw_lm;
> +	uint32_t blend_op;
>  
>  	/* default to opaque blending */
> -	lm->ops.setup_blend_config(lm, pstate->stage, 0XFF, 0,
> -				DPU_BLEND_FG_ALPHA_FG_CONST |
> -				DPU_BLEND_BG_ALPHA_BG_CONST);
> +	blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
> +		DPU_BLEND_BG_ALPHA_BG_CONST;
> +
> +	if (format->alpha_enable) {
> +		/* coverage blending */
> +		blend_op = DPU_BLEND_FG_ALPHA_FG_PIXEL |
> +			DPU_BLEND_BG_ALPHA_FG_PIXEL |
> +			DPU_BLEND_BG_INV_ALPHA;
> +	}
> +
> +	lm->ops.setup_blend_config(lm, pstate->stage,
> +				0xFF, 0, blend_op);
> +
> +	DPU_DEBUG(
> +		"format:%4.4s, alpha_en(%u) blend_op:0x%x\n",

This will fit on one line.

> +		(char *) &format->base.pixel_format,

drm_get_format_name() please

> +			format->alpha_enable, blend_op);
>  }
>  
>  static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> @@ -401,7 +416,8 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
>  
>  		/* blend config update */
>  		for (lm_idx = 0; lm_idx < dpu_crtc->num_mixers; lm_idx++) {
> -			_dpu_crtc_setup_blend_cfg(mixer + lm_idx, pstate);
> +			_dpu_crtc_setup_blend_cfg(mixer + lm_idx,
> +						pstate, format);
>  
>  			mixer[lm_idx].flush_mask |= flush_mask;
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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