linux-kernel - Re: [PATCH v1 5/6] drm/mediatek: mtk_dpi: Add checks for reg_h_fre

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Message-ID: <7566e9629d834c07b75324a4925d45c9d0f71958.camel@mediatek.com>
Date: Tue, 26 Nov 2024 05:45:37 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "simona@...ll.ch"
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	"mripard@...nel.org" <mripard@...nel.org>,
	Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
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	<matthias.bgg@...il.com>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>
Subject: Re: [PATCH v1 5/6] drm/mediatek: mtk_dpi: Add checks for
 reg_h_fre_con existence

Hi, Angelo:

On Wed, 2024-11-20 at 13:44 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> In preparation for adding support for newer DPI instances which
> do support direct-pin but do not have any H_FRE_CON register,
> like the one found in MT8195 and MT8188, add a branch to check
> if the reg_h_fre_con variable was declared in the mtk_dpi_conf
> structure for the probed SoC DPI version.
> 
> As a note, this is useful specifically only for cases in which
> the support_direct_pin variable is true, so mt8195-dpintf is
> not affected by any issue.

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

> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 378b49b6bdfb..79923d1bfbc9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -430,12 +430,13 @@ static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
> 
>  static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
>  {
> -       mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
> +       if (dpi->conf->reg_h_fre_con)
> +               mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
>  }
> 
>  static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
>  {
> -       if (dpi->conf->edge_sel_en)
> +       if (dpi->conf->edge_sel_en && dpi->conf->reg_h_fre_con)
>                 mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
>  }
> 
> --
> 2.47.0
>