linux-kernel - Re: [PATCH v15 14/16] drm/mediatek: dpi: add config to support direct connection to dpi panels

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Message-ID: <ae8e981a660ff6375ef09dd7b6714bad27f55347.camel@mediatek.com>
Date:   Tue, 5 Jul 2022 13:24:07 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <xinlei.lee@...iatek.com>, <liangxu.xu@...iatek.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v15 14/16] drm/mediatek: dpi: add config to support
 direct connection to dpi panels

Hi, Bo-Chen:

On Fri, 2022-07-01 at 11:58 +0800, Bo-Chen Chen wrote:
> MediaTek dpi supports direct connection to dpi panels while dp_intf
> does not
> support. Therefore, add a config "support_direct_pin" to control
> this.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 0a604bf68b1b..a65b85c4c8d5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -124,6 +124,7 @@ struct mtk_dpi_yc_limit {
>   * @is_ck_de_pol: Support CK/DE polarity.
>   * @swap_input_support: Support input swap function.
>   * @color_fmt_trans_support: Enable color format transfer.
> + * @support_direct_pin: IP supports direct connection to dpi panels.
>   * @dimension_mask: Mask used for HWIDTH, HPORCH, VSYNC_WIDTH and
> VSYNC_PORCH
>   *		    (no shift).
>   * @hvsize_mask: Mask of HSIZE and VSIZE mask (no shift).
> @@ -141,6 +142,7 @@ struct mtk_dpi_conf {
>  	bool is_ck_de_pol;
>  	bool swap_input_support;
>  	bool color_fmt_trans_support;
> +	bool support_direct_pin;
>  	u32 dimension_mask;
>  	u32 hvsize_mask;
>  	u32 channel_swap_shift;
> @@ -608,11 +610,13 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
>  	mtk_dpi_config_channel_limit(dpi);
>  	mtk_dpi_config_bit_num(dpi, dpi->bit_num);
>  	mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
> -	mtk_dpi_config_yc_map(dpi, dpi->yc_map);
>  	mtk_dpi_config_color_format(dpi, dpi->color_format);
> -	mtk_dpi_config_2n_h_fre(dpi);
> -	mtk_dpi_dual_edge(dpi);
> -	mtk_dpi_config_disable_edge(dpi);
> +	if (dpi->conf->support_direct_pin) {
> +		mtk_dpi_config_yc_map(dpi, dpi->yc_map);
> +		mtk_dpi_config_2n_h_fre(dpi);
> +		mtk_dpi_dual_edge(dpi);
> +		mtk_dpi_config_disable_edge(dpi);
> +	}
>  	mtk_dpi_sw_reset(dpi, false);
>  
>  	return 0;
> @@ -870,6 +874,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
>  	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
>  	.is_ck_de_pol = true,
>  	.swap_input_support = true,
> +	.support_direct_pin = true,
>  	.dimension_mask = HPW_MASK,
>  	.hvsize_mask = HSIZE_MASK,
>  	.channel_swap_shift = CH_SWAP,
> @@ -886,6 +891,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
>  	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
>  	.is_ck_de_pol = true,
>  	.swap_input_support = true,
> +	.support_direct_pin = true,
>  	.dimension_mask = HPW_MASK,
>  	.hvsize_mask = HSIZE_MASK,
>  	.channel_swap_shift = CH_SWAP,
> @@ -901,6 +907,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
>  	.is_ck_de_pol = true,
>  	.swap_input_support = true,
> +	.support_direct_pin = true,
>  	.dimension_mask = HPW_MASK,
>  	.hvsize_mask = HSIZE_MASK,
>  	.channel_swap_shift = CH_SWAP,
> @@ -916,6 +923,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
>  	.is_ck_de_pol = true,
>  	.swap_input_support = true,
> +	.support_direct_pin = true,
>  	.dimension_mask = HPW_MASK,
>  	.hvsize_mask = HSIZE_MASK,
>  	.channel_swap_shift = CH_SWAP,