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....@mediatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.c...@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
