linux-kernel - Re: [PATCH 07/15] drm/mediatek: Support alpha blending in VDOSYS1

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Date:   Thu, 7 Sep 2023 14:15:38 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Hsiao Chien Sung <shawn.sung@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Jason-JH Lin <jason-jh.lin@...iatek.com>
Subject: Re: [PATCH 07/15] drm/mediatek: Support alpha blending in VDOSYS1

Il 23/08/23 17:13, Hsiao Chien Sung ha scritto:
> Support premultiply and coverage alpha blending modes.
> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_ethdr.c | 50 +++++++++++++++++++++-------
>   1 file changed, 38 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c b/drivers/gpu/drm/mediatek/mtk_ethdr.c
> index 73dc4da3ba3b..3058c122a4c3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
> +++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
> @@ -5,6 +5,7 @@
>   
>   #include <drm/drm_fourcc.h>
>   #include <drm/drm_framebuffer.h>
> +#include <drm/drm_blend.h>
>   #include <linux/clk.h>
>   #include <linux/component.h>
>   #include <linux/of_device.h>
> @@ -35,6 +36,7 @@
>   #define MIX_SRC_L0_EN				BIT(0)
>   #define MIX_L_SRC_CON(n)		(0x28 + 0x18 * (n))
>   #define NON_PREMULTI_SOURCE			(2 << 12)
> +#define PREMULTI_SOURCE				(3 << 12)
>   #define MIX_L_SRC_SIZE(n)		(0x30 + 0x18 * (n))
>   #define MIX_L_SRC_OFFSET(n)		(0x34 + 0x18 * (n))
>   #define MIX_FUNC_DCM0			0x120
> @@ -50,9 +52,7 @@
>   
>   #define MIXER_INX_MODE_BYPASS			0
>   #define MIXER_INX_MODE_EVEN_EXTEND		1
> -#define DEFAULT_9BIT_ALPHA			0x100
>   #define	MIXER_ALPHA_AEN				BIT(8)
> -#define	MIXER_ALPHA				0xff
>   #define ETHDR_CLK_NUM				13
>   
>   enum mtk_ethdr_comp_id {
> @@ -153,33 +153,59 @@ void mtk_ethdr_layer_config(struct device *dev, unsigned int idx,
>   	struct mtk_plane_pending_state *pending = &state->pending;
>   	unsigned int offset = (pending->x & 1) << 31 | pending->y << 16 | pending->x;
>   	unsigned int align_width = ALIGN_DOWN(pending->width, 2);
> -	unsigned int alpha_con = 0;
> +	unsigned int mix_con = NON_PREMULTI_SOURCE;
> +	bool replace_src_a = false;
> +
> +	union format {
> +		unsigned int raw;
> +		char str[5];

Can we please use fixed size variables?

		u32 raw;
		u8 str[5];

> +	} format;
>   

Regards,
Angelo