linux-kernel - Re: [PATCH v10 11/21] drm/mediatek: dpi: move swap_shift to SoC config

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Date:   Thu, 2 Jun 2022 19:38:57 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>,
        Guillaume Ranquet <granquet@...libre.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "Kishon Vijay Abraham I" <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, "Helge Deller" <deller@....de>,
        Jitao shi <jitao.shi@...iatek.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.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>,
        <linux-phy@...ts.infradead.org>, <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v10 11/21] drm/mediatek: dpi: move swap_shift to SoC
 config

On Mon, 2022-05-30 at 16:38 +0800, CK Hu wrote:
> Hi, Guillaume:
> 
> On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote:
> > Add flexibility by moving the swap shift value to SoC specific
> > config
> > 
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > Reviewed-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@...labora.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dpi.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 6eeda222a973..6d4d8c6ec47d 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -131,6 +131,7 @@ struct mtk_dpi_conf {
> >  	u32 dimension_mask;
> >  	/* HSIZE and VSIZE mask (no shift) */
> >  	u32 hvsize_mask;
> > +	u32 channel_swap_shift;
> >  	const struct mtk_dpi_yc_limit *limit;
> >  };
> >  
> > @@ -349,7 +350,8 @@ static void mtk_dpi_config_channel_swap(struct
> > mtk_dpi *dpi,
> >  		break;
> >  	}
> >  
> > -	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP,
> > CH_SWAP_MASK);
> > +	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << dpi->conf-
> > > channel_swap_shift,
> > 
> > +		     CH_SWAP_MASK);
> > From the definiton:
> 
>  #define CH_SWAP				0
> +#define DPINTF_CH_SWAP			BIT(1)
>  #define CH_SWAP_MASK			(0x7 << 0)
> +#define DPINTF_CH_SWAP_MASK		(0x7 << 1)
> 
> This statement should be:
> 
> mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << dpi->conf-
> > channel_swap_shift, CH_SWAP_MASK << dpi->conf->channel_swap_shift);
> 
> dpi->conf->channel_swap_shift is 1 for MT8195-DP_INTF and 0 for
> others.
> And drop the definition of DPINTF_CH_SWAP and DPINTF_CH_SWAP_MASK,
> 
> Regards,
> CK
> 

Hello CK,

I think we should keep DPINTF_CH_SWAP?
BIT(1) = 2 so the shift should be:
dpi->conf->channel_swap_shift is 2 for MT8195-DP_INTF and 0 for
others.

BRs,
Bo-Chen
> 
> >  }
> >  
> >  static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool
> > enable)
> > @@ -821,6 +823,7 @@ static const struct mtk_dpi_conf mt8173_conf =
> > {
> >  	.swap_input_support = true,
> >  	.dimension_mask = HPW_MASK,
> >  	.hvsize_mask = HSIZE_MASK,
> > +	.channel_swap_shift = CH_SWAP,
> >  	.limit = &mtk_dpi_limit,
> >  };
> >  
> > @@ -835,6 +838,7 @@ static const struct mtk_dpi_conf mt2701_conf =
> > {
> >  	.swap_input_support = true,
> >  	.dimension_mask = HPW_MASK,
> >  	.hvsize_mask = HSIZE_MASK,
> > +	.channel_swap_shift = CH_SWAP,
> >  	.limit = &mtk_dpi_limit,
> >  };
> >  
> > @@ -848,6 +852,7 @@ static const struct mtk_dpi_conf mt8183_conf =
> > {
> >  	.swap_input_support = true,
> >  	.dimension_mask = HPW_MASK,
> >  	.hvsize_mask = HSIZE_MASK,
> > +	.channel_swap_shift = CH_SWAP,
> >  	.limit = &mtk_dpi_limit,
> >  };
> >  
> > @@ -861,6 +866,7 @@ static const struct mtk_dpi_conf mt8192_conf =
> > {
> >  	.swap_input_support = true,
> >  	.dimension_mask = HPW_MASK,
> >  	.hvsize_mask = HSIZE_MASK,
> > +	.channel_swap_shift = CH_SWAP,
> >  	.limit = &mtk_dpi_limit,
> >  };
> >  
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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