linux-kernel - Re: [PATCH 2/2] drm: mediatek: Adjust the dpi output format to MT8186

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Date:   Fri, 1 Jul 2022 14:33:51 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     <xinlei.lee@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <matthias.bgg@...il.com>, <yongqiang.niu@...iatek.com>,
        <enric.balletbo@...labora.com>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <jitao.shi@...iatek.com>
Subject: Re: [PATCH 2/2] drm: mediatek: Adjust the dpi output format to
 MT8186

On Fri, 2022-07-01 at 11:15 +0800, xinlei.lee@...iatek.com wrote:
> From: Xinlei Lee <xinlei.lee@...iatek.com>
> 
> Dpi output needs to adjust the output format to dual edge for MT8186.
> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c      | 21 +++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_dpi_regs.h |  5 +++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index e61cd67b978f..82a5209a1dd8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -15,6 +15,7 @@
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/platform_device.h>
>  #include <linux/types.h>
> +#include <linux/soc/mediatek/mtk-mmsys.h>
>  

Please reorder this.

>  #include <video/videomode.h>
>  
> @@ -28,6 +29,7 @@
>  #include "mtk_disp_drv.h"
>  #include "mtk_dpi_regs.h"
>  #include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_drv.h"
>  
>  enum mtk_dpi_out_bit_num {
>  	MTK_DPI_OUT_BIT_NUM_8BITS,
> @@ -85,6 +87,7 @@ struct mtk_dpi {
>  	struct pinctrl_state *pins_dpi;
>  	u32 output_fmt;
>  	int refcount;
> +	struct device *mmsys_dev;
>  };
>  
>  static inline struct mtk_dpi *bridge_to_dpi(struct drm_bridge *b)
> @@ -125,6 +128,7 @@ struct mtk_dpi_conf {
>  	bool edge_sel_en;
>  	const u32 *output_fmts;
>  	u32 num_output_fmts;
> +	bool rgb888_dual_enable;
>  };
>  
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val,
> u32 mask)
> @@ -393,6 +397,9 @@ static void mtk_dpi_dual_edge(struct mtk_dpi
> *dpi)
>  		mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING,
>  			     dpi->output_fmt ==
> MEDIA_BUS_FMT_RGB888_2X12_LE ?
>  			     EDGE_SEL : 0, EDGE_SEL);
> +	if (dpi->conf->rgb888_dual_enable)
> +		mtk_mmsys_ddp_dpi_confing(dpi->mmsys_dev,
> DPI_RGB888_DDR_CON,
> +					  DPI_FORMAT_MASK, NULL);
>  	} else {
>  		mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE,
> 0);
>  	}
> @@ -705,8 +712,10 @@ static int mtk_dpi_bind(struct device *dev,
> struct device *master, void *data)
>  {
>  	struct mtk_dpi *dpi = dev_get_drvdata(dev);
>  	struct drm_device *drm_dev = data;
> +	struct mtk_drm_private *priv = drm_dev->dev_private;
>  	int ret;
>  
> +	dpi->mmsys_dev = priv->mmsys_dev;
>  	ret = drm_simple_encoder_init(drm_dev, &dpi->encoder,
>  				      DRM_MODE_ENCODER_TMDS);
>  	if (ret) {
> @@ -823,6 +832,15 @@ static const struct mtk_dpi_conf mt8192_conf = {
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
>  };
>  
> +static const struct mtk_dpi_conf mt8186_conf = {
> +		.cal_factor = mt8183_calculate_factor,
> +		.reg_h_fre_con = 0xe0,
> +		.max_clock_khz = 150000,
> +		.output_fmts = mt8183_output_fmts,
> +		.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> +		.rgb888_dual_enable = true,
> +};
> +

please put this between 8183 and 8192.

>  static int mtk_dpi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -945,6 +963,9 @@ static const struct of_device_id mtk_dpi_of_ids[]
> = {
>  	{ .compatible = "mediatek,mt8192-dpi",
>  	  .data = &mt8192_conf,
>  	},
> +	{ .compatible = "mediatek,mt8186-dpi",
> +	  .data = &mt8186_conf,
> +	},

ditto

>  	{ },
>  };
>  MODULE_DEVICE_TABLE(of, mtk_dpi_of_ids);
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 3a02fabe1662..24d4cdf3696b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -217,4 +217,9 @@
>  
>  #define EDGE_SEL_EN			BIT(5)
>  #define H_FRE_2N			BIT(25)
> +
> +#define DPI_FORMAT_MASK			0x1
> +#define DPI_RGB888_DDR_CON		BIT(0)
> +#define DPI_RGB565_SDR_CON		BIT(1)
> +
>  #endif /* __MTK_DPI_REGS_H */