diff mbox series

[v2,1/3] drm/mediatek: dpi dual edge sample mode support

Message ID 1618407316-10042-2-git-send-email-rex-bc.chen@mediatek.com (mailing list archive)
State New
Headers show
Series mt8183 dpi supports dual edge | expand

Commit Message

Rex-BC Chen April 14, 2021, 1:35 p.m. UTC
DPI can sample on falling, rising or both edge.
When DPI sample the data both rising and falling edge.
It can reduce half data io pins.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Neil Armstrong April 19, 2021, 7:36 a.m. UTC | #1
Hi,

On 14/04/2021 15:35, Rex-BC Chen wrote:
> DPI can sample on falling, rising or both edge.
> When DPI sample the data both rising and falling edge.
> It can reduce half data io pins.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index b05f900d9322..21a3a7b78835 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -83,6 +83,7 @@ struct mtk_dpi {
>  	struct pinctrl *pinctrl;
>  	struct pinctrl_state *pins_gpio;
>  	struct pinctrl_state *pins_dpi;
> +	bool ddr_edge_sel;
>  	int refcount;
>  };
>  
> @@ -121,6 +122,7 @@ 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)
> @@ -380,6 +382,15 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>  	}
>  }
>  
> +static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
> +{
> +	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, dpi->ddr_edge_sel ? EDGE_SEL : 0, EDGE_SEL);
> +	}
> +}
> +

By using the downstream code as reference:

-       clk_set_rate(dpi->pixel_clk, vm.pixelclock);
+       clk_set_rate(dpi->pixel_clk, vm.pixelclock * (dpi->conf->dual_edge ? 2 : 1));

is missing in mtk_dpi_set_display_mode()

>  static void mtk_dpi_power_off(struct mtk_dpi *dpi)
>  {
>  	if (WARN_ON(dpi->refcount == 0))
> @@ -518,6 +529,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  	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);
>  	mtk_dpi_sw_reset(dpi, false);
>  
> 

Neil
Rex-BC Chen April 29, 2021, 2:23 a.m. UTC | #2
On Mon, 2021-04-19 at 09:36 +0200, Neil Armstrong wrote:
> Hi,
> 
> On 14/04/2021 15:35, Rex-BC Chen wrote:
> > DPI can sample on falling, rising or both edge.
> > When DPI sample the data both rising and falling edge.
> > It can reduce half data io pins.
> > 
> > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> > Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index b05f900d9322..21a3a7b78835 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -83,6 +83,7 @@ struct mtk_dpi {
> >  	struct pinctrl *pinctrl;
> >  	struct pinctrl_state *pins_gpio;
> >  	struct pinctrl_state *pins_dpi;
> > +	bool ddr_edge_sel;
> >  	int refcount;
> >  };
> >  
> > @@ -121,6 +122,7 @@ 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)
> > @@ -380,6 +382,15 @@ static void mtk_dpi_config_color_format(struct
> > mtk_dpi *dpi,
> >  	}
> >  }
> >  
> > +static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
> > +{
> > +	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, dpi->ddr_edge_sel 
> > ? EDGE_SEL : 0, EDGE_SEL);
> > +	}
> > +}
> > +
> 
> By using the downstream code as reference:
> 
> -       clk_set_rate(dpi->pixel_clk, vm.pixelclock);
> +       clk_set_rate(dpi->pixel_clk, vm.pixelclock * (dpi->conf-
> >dual_edge ? 2 : 1));
> 
> is missing in mtk_dpi_set_display_mode()
> 
Hello Neil,

Thanks for helping checking this.
I will add this modification for next patch.

BRs,
Rex-BC Chen
> >  static void mtk_dpi_power_off(struct mtk_dpi *dpi)
> >  {
> >  	if (WARN_ON(dpi->refcount == 0))
> > @@ -518,6 +529,7 @@ static int mtk_dpi_set_display_mode(struct
> > mtk_dpi *dpi,
> >  	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);
> >  	mtk_dpi_sw_reset(dpi, false);
> >  
> > 
> 
> Neil
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index b05f900d9322..21a3a7b78835 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -83,6 +83,7 @@  struct mtk_dpi {
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *pins_gpio;
 	struct pinctrl_state *pins_dpi;
+	bool ddr_edge_sel;
 	int refcount;
 };
 
@@ -121,6 +122,7 @@  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)
@@ -380,6 +382,15 @@  static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 	}
 }
 
+static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
+{
+	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, dpi->ddr_edge_sel ? EDGE_SEL : 0, EDGE_SEL);
+	}
+}
+
 static void mtk_dpi_power_off(struct mtk_dpi *dpi)
 {
 	if (WARN_ON(dpi->refcount == 0))
@@ -518,6 +529,7 @@  static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 	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);
 	mtk_dpi_sw_reset(dpi, false);