linux-kernel - Re: [PATCH 9/9] drm/mediatek: add dpi dual edge support

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Date:   Tue, 22 Jan 2019 15:03:18 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     chunhui dai <chunhui.dai@...iatek.com>,
        --to=Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, CK Hu <ck.hu@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Sean Wang <sean.wang@...iatek.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Colin Ian King <colin.king@...onical.com>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <dri-devel@...ts.freedesktop.org>, <srv_heupstream@...iatek.com>,
        <bibby.hsieh@...iatek.com>, <jamesjj.liao@...iatek.com>
Subject: Re: [PATCH 9/9] drm/mediatek: add dpi dual edge support

On Wed, 2019-01-09 at 17:58 +0100, Matthias Brugger wrote:
> 
> On 04/01/2019 08:03, chunhui dai wrote:
> > DPI sample on rising and falling edge. It can reduce half data io.
> > 
> > Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> > Signed-off-by: chunhui dai <chunhui.dai@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dpi.c | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 4a2f4a6..acb4f47 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -117,6 +117,7 @@ struct mtk_dpi_conf {
> >  	unsigned int (*cal_factor)(int clock);
> >  	u32 reg_h_fre_con;
> >  	bool edge_sel_en;
> > +	bool dual_edge;
> >  };
> >  
> >  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
> > @@ -353,6 +354,15 @@ static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
> >  		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
> >  }
> >  
> > +static void mtk_dpi_config_dual_edge(struct mtk_dpi *dpi)
> 
> I think it is clearer if you rename the function to something like:
> mtk_dpi_enable_dual_edge and call it in mtk_dpi_set_display_mode if
> dpi->conf->dual_edge is true.
> 
> Regards,
> Matthias
> 

I'll fix it in next patch.

Best Regards
Jitao

> > +{
> > +	if (dpi->conf->dual_edge) {
> > +		mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN |
> > +				DDR_4PHASE, DDR_EN | DDR_4PHASE);
> > +		mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, EDGE_SEL, EDGE_SEL);
> > +	}
> > +}
> > +
> >  static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> >  					enum mtk_dpi_out_color_format format)
> >  {
> > @@ -509,6 +519,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
> >  	mtk_dpi_config_color_format(dpi, dpi->color_format);
> >  	mtk_dpi_config_2n_h_fre(dpi);
> >  	mtk_dpi_config_disable_edge(dpi);
> > +	mtk_dpi_config_dual_edge(dpi);
> >  	mtk_dpi_sw_reset(dpi, false);
> >  
> >  	return 0;
> > @@ -669,6 +680,16 @@ static unsigned int mt2701_calculate_factor(int clock)
> >  		return 1;
> >  }
> >  
> > +static unsigned int mt8183_calculate_factor(int clock)
> > +{
> > +	if (clock <= 27000)
> > +		return 8;
> > +	else if (clock <= 167000)
> > +		return 4;
> > +	else
> > +		return 2;
> > +}
> > +
> >  static const struct mtk_dpi_conf mt8173_conf = {
> >  	.cal_factor = mt8173_calculate_factor,
> >  	.reg_h_fre_con = 0xe0,
> > @@ -680,6 +701,12 @@ static unsigned int mt2701_calculate_factor(int clock)
> >  	.edge_sel_en = true,
> >  };
> >  
> > +static const struct mtk_dpi_conf mt8183_conf = {
> > +	.cal_factor = mt8183_calculate_factor,
> > +	.reg_h_fre_con = 0xe0,
> > +	.dual_edge = true,
> > +};
> > +
> >  static int mtk_dpi_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> > @@ -775,6 +802,9 @@ static int mtk_dpi_remove(struct platform_device *pdev)
> >  	{ .compatible = "mediatek,mt8173-dpi",
> >  	  .data = &mt8173_conf,
> >  	},
> > +	{ .compatible = "mediatek,mt8183-dpi",
> > +	  .data = &mt8183_conf,
> > +	},
> >  	{ },
> >  };
> >  
> >