Message-ID: <20170919202539.bs3lr2xebiyhdvb3@art_vandelay>
Date:   Tue, 19 Sep 2017 13:25:39 -0700
From:   Sean Paul <seanpaul@...omium.org>
To:     Nickey Yang <nickey.yang@...k-chips.com>
Cc:     mark.yao@...k-chips.com, robh+dt@...nel.org, heiko@...ech.de,
        mark.rutland@....com, airlied@...ux.ie,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, seanpaul@...omium.org,
        briannorris@...omium.org, hl@...k-chips.com, zyw@...k-chips.com,
        bivvy.bi@...k-chips.com, xbl@...k-chips.com
Subject: Re: [PATCH 2/7] drm/rockchip/dsi: add dual mipi channel support

On Mon, Sep 18, 2017 at 05:05:34PM +0800, Nickey Yang wrote:

Hi Nickey,
You're adding a substantial new feature to the driver. You should add a commit
message that describes what you're adding, why you're adding it, and how it is
done.

> Signed-off-by: Nickey Yang <nickey.yang@...k-chips.com>
> ---
>  drivers/gpu/drm/rockchip/dw-mipi-dsi.c      | 353 ++++++++++++++++++++--------
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.h |   1 +
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   2 +
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.h |   3 +
>  4 files changed, 257 insertions(+), 102 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 52698b7..9265b7f 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -42,6 +42,17 @@
>  #define RK3399_GRF_SOC_CON22		0x6258
>  #define RK3399_GRF_DSI_MODE		0xffff0000
>  
> +/* disable turndisable, forcetxstopmode, forcerxmode, enable */
> +#define RK3399_GRF_SOC_CON23		0x625c
> +#define RK3399_GRF_DSI1_MODE1		0xffff0000
> +#define RK3399_GRF_DSI1_ENABLE		0x000f000f

Please break these out into separate defines so we know which bit is
responsible for turning on/off each feature.

> +/* disable basedir and enable clk*/
> +#define RK3399_GRF_SOC_CON24		0x6260
> +#define RK3399_TXRX_MASTERSLAVEZ	BIT(7)
> +#define RK3399_TXRX_ENABLECLK		BIT(6)
> +#define RK3399_TXRX_BASEDIR		BIT(5)
> +#define RK3399_GRF_DSI1_MODE2		0x00e00080

Same comment here.

> +
>  #define DSI_VERSION			0x00
>  #define DSI_PWR_UP			0x04
>  #define RESET				0
> @@ -282,6 +293,12 @@ struct dw_mipi_dsi_plat_data {
>  	u32 grf_switch_reg;
>  	u32 grf_dsi0_mode;
>  	u32 grf_dsi0_mode_reg;
> +	u32 grf_dsi1_mode;
> +	u32 grf_dsi1_mode_reg1;
> +	u32 dsi1_basedir;
> +	u32 dsi1_masterslavez;
> +	u32 dsi1_enableclk;
> +	u32 grf_dsi1_mode_reg2;
>  	unsigned int flags;
>  	unsigned int max_data_lanes;
>  };
> @@ -300,6 +317,12 @@ struct dw_mipi_dsi {
>  	struct clk *pclk;
>  	struct clk *phy_cfg_clk;
>  
> +	/* dual-channel */
> +	struct dw_mipi_dsi *master;
> +	struct dw_mipi_dsi *slave;
> +	struct device_node *panel_node;
> +	int id;
> +
>  	int dpms_mode;
>  	unsigned int lane_mbps; /* per lane */
>  	u32 channel;
> @@ -526,6 +549,7 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
>  	unsigned int target_mbps = 1000;
>  	unsigned int max_mbps = dptdin_map[ARRAY_SIZE(dptdin_map) - 1].max_mbps;
>  	int bpp;
> +	int lanes = dsi->lanes;
>  	unsigned long best_freq = 0;
>  	unsigned long fvco_min, fvco_max, fin ,fout;
>  	unsigned int min_prediv, max_prediv;
> @@ -540,10 +564,13 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
>  		return bpp;
>  	}
>  
> +	if (dsi->slave || dsi->master)
> +		lanes = dsi->lanes * 2;
> +
>  	mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
>  	if (mpclk) {
>  		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
> -		tmp = mpclk * (bpp / dsi->lanes) * 10 / 8;
> +		tmp = mpclk * (bpp / lanes) * 10 / 8;
>  		if (tmp < max_mbps)
>  			target_mbps = tmp;
>  		else
> @@ -605,17 +632,26 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
>  				   struct mipi_dsi_device *device)
>  {
>  	struct dw_mipi_dsi *dsi = host_to_dsi(host);
> +	int lanes = dsi->slave ? device->lanes / 2 : device->lanes;
>  
> -	if (device->lanes > dsi->pdata->max_data_lanes) {
> +	if (lanes > dsi->pdata->max_data_lanes) {
>  		dev_err(dsi->dev, "the number of data lanes(%u) is too many\n",
> -			device->lanes);
> +			lanes);
>  		return -EINVAL;
>  	}
>  
> -	dsi->lanes = device->lanes;
> +	dsi->lanes = lanes;
>  	dsi->channel = device->channel;
>  	dsi->format = device->format;
>  	dsi->mode_flags = device->mode_flags;
> +
> +	if (dsi->slave) {
> +		dsi->slave->lanes = lanes;
> +		dsi->slave->channel = device->channel;
> +		dsi->slave->format = device->format;
> +		dsi->slave->mode_flags = device->mode_flags;
> +	}
> +
>  	dsi->panel = of_drm_find_panel(device->dev.of_node);
>  	if (dsi->panel)
>  		return drm_panel_attach(dsi->panel, &dsi->connector);
> @@ -745,15 +781,22 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
>  	int ret;
>  
>  	dw_mipi_message_config(dsi, msg);
> +	if (dsi->slave)
> +		dw_mipi_message_config(dsi->slave, msg);
>  
>  	switch (msg->type) {
>  	case MIPI_DSI_DCS_SHORT_WRITE:
>  	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
>  	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
> +	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
>  		ret = dw_mipi_dsi_dcs_short_write(dsi, msg);
> +		if (dsi->slave)
> +			ret = dw_mipi_dsi_dcs_short_write(dsi->slave, msg);
>  		break;
>  	case MIPI_DSI_DCS_LONG_WRITE:
>  		ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
> +		if (dsi->slave)
> +			ret = dw_mipi_dsi_dcs_long_write(dsi->slave, msg);
>  		break;
>  	default:
>  		dev_err(dsi->dev, "unsupported message type 0x%02x\n",
> @@ -827,6 +870,64 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>  		  TX_ESC_CLK_DIVIDSION(esc_clk_division));
>  }
>  
> +static void rockchip_dsi_grf_config(struct dw_mipi_dsi *dsi, int vop_id)
> +{
> +	const struct dw_mipi_dsi_plat_data *pdata = dsi->pdata;
> +	int val = 0;
> +	int ret;
> +
> +	/*
> +	 * For the RK3399, the clk of grf must be enabled before writing grf
> +	 * register. And for RK3288 or other soc, this grf_clk must be NULL,
> +	 * the clk_prepare_enable return true directly.
> +	 */
> +	ret = clk_prepare_enable(dsi->grf_clk);
> +	if (ret) {
> +		dev_err(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> +		return;
> +	}
> +
> +	if (dsi->slave) {
> +		if (vop_id)
> +			val = pdata->dsi0_en_bit |
> +			      (pdata->dsi0_en_bit << 16) |
> +			      pdata->dsi1_en_bit |
> +			      (pdata->dsi1_en_bit << 16);
> +		else
> +			val = (pdata->dsi0_en_bit << 16) |
> +			      (pdata->dsi1_en_bit << 16);
> +
> +		regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
> +
> +		if (pdata->grf_dsi0_mode_reg)
> +			regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
> +				     pdata->grf_dsi0_mode);
> +		if (pdata->grf_dsi1_mode_reg1)
> +			regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg1,
> +				     pdata->grf_dsi1_mode);
> +		if (pdata->grf_dsi1_mode_reg2)
> +			regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg2,
> +				     RK3399_GRF_DSI1_MODE2);
> +		if (pdata->grf_dsi1_mode_reg1)
> +			regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg1,
> +				     RK3399_GRF_DSI1_ENABLE);
> +	} else {
> +		if (vop_id)
> +			val = pdata->dsi0_en_bit |
> +			      (pdata->dsi0_en_bit << 16);
> +		else
> +			val = pdata->dsi0_en_bit << 16;
> +
> +		regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
> +
> +		if (pdata->grf_dsi0_mode_reg)
> +			regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
> +				     pdata->grf_dsi0_mode);
> +	}

You have some duplication here, how about:

        val = pdata->dsi0_en_bit << 16;
        if (dsi->slave)
                val |= pdata->dsi1_en_bit << 16
        if (vop_id) {
                val |= pdata->dsi0_en_bit;
                if (dsi->slave)
                        val |= pdata->dsi1_en_bit;
        }
        regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);

        if (pdata->grf_dsi0_mode_reg)
                regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
                             pdata->grf_dsi0_mode);

        if (dsi->slave) {
                if (pdata->grf_dsi1_mode_reg1)
                        regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg1,
                                     pdata->grf_dsi1_mode);
		if (pdata->grf_dsi1_mode_reg2)
			regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg2,
				     RK3399_GRF_DSI1_MODE2);
		if (pdata->grf_dsi1_mode_reg1)
			regmap_write(dsi->grf_regmap, pdata->grf_dsi1_mode_reg1,
				     RK3399_GRF_DSI1_ENABLE);
        }

> +
> +	clk_disable_unprepare(dsi->grf_clk);
> +}
> +
>  static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
>  				   struct drm_display_mode *mode)
>  {
> @@ -867,7 +968,14 @@ static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
>  static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
>  					    struct drm_display_mode *mode)
>  {
> -	dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
> +	int pkt_size;
> +
> +	if (dsi->slave || dsi->master)
> +		pkt_size = VID_PKT_SIZE(mode->hdisplay / 2 + 4);

Why add 4? Please either add a comment, pull out into a well-named define, or
both :)

> +	else
> +		pkt_size = VID_PKT_SIZE(mode->hdisplay);
> +
> +	dsi_write(dsi, DSI_VID_PKT_SIZE, pkt_size);
>  }
>  
>  static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
> @@ -971,24 +1079,24 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
>  
>  	dw_mipi_dsi_disable(dsi);
>  	pm_runtime_put(dsi->dev);
> +
> +	if (dsi->slave) {
> +		if (clk_prepare_enable(dsi->slave->pclk)) {
> +			dev_err(dsi->slave->dev, "%s: Failed to enable pclk\n", __func__);

Rockchip driver has been moved to using the DRM_DEV_* log messages, please
change all instances of dev_* in the patch.

> +			return;

You still need to disable_unprepare dsi->pclk as well. Consider adding a label
'out' above the disable_unprepare below and jump to it from here.

> +		}
> +		dw_mipi_dsi_disable(dsi->slave);
> +		pm_runtime_put(dsi->slave->dev);
> +		clk_disable_unprepare(dsi->slave->pclk);
> +	}
> +
>  	clk_disable_unprepare(dsi->pclk);
>  	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
>  }
>  
> -static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
> +static void dw_mipi_dsi_enable(struct dw_mipi_dsi *dsi, struct drm_display_mode *mode)
>  {
> -	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
> -	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
> -	const struct dw_mipi_dsi_plat_data *pdata = dsi->pdata;
> -	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
> -	u32 val;
> -	int ret;
> -
> -	ret = dw_mipi_dsi_get_lane_bps(dsi, mode);
> -	if (ret < 0)
> -		return;
> -
> -	if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
> +	if (dw_mipi_dsi_get_lane_bps(dsi, mode) < 0)

Can you please log an error with the return code here? Silently failing is bound
to cause frustration.

>  		return;
>  
>  	if (clk_prepare_enable(dsi->pclk)) {
> @@ -1009,43 +1117,42 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
>  	dw_mipi_dsi_dphy_interface_config(dsi);
>  	dw_mipi_dsi_clear_err(dsi);
>  
> -	/*
> -	 * For the RK3399, the clk of grf must be enabled before writing grf
> -	 * register. And for RK3288 or other soc, this grf_clk must be NULL,
> -	 * the clk_prepare_enable return true directly.
> -	 */
> -	ret = clk_prepare_enable(dsi->grf_clk);
> -	if (ret) {
> -		dev_err(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> -		return;
> -	}
> -
> -	if (pdata->grf_dsi0_mode_reg)
> -		regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
> -			     pdata->grf_dsi0_mode);
> -
>  	dw_mipi_dsi_phy_init(dsi);
>  	dw_mipi_dsi_wait_for_two_frames(mode);
>  
>  	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
> +}
> +
> +static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
> +{
> +	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
> +	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
> +	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
> +
> +	if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
> +		return;
> +
> +	rockchip_dsi_grf_config(dsi, mux);
> +	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
> +
> +	dw_mipi_dsi_enable(dsi, mode);
> +	if (dsi->slave)
> +		dw_mipi_dsi_enable(dsi->slave, mode);
> +
>  	if (drm_panel_prepare(dsi->panel))
>  		dev_err(dsi->dev, "failed to prepare panel\n");
>  
>  	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
> +	if (dsi->slave)
> +		dw_mipi_dsi_set_mode(dsi->slave, DW_MIPI_DSI_VID_MODE);
> +
>  	drm_panel_enable(dsi->panel);
>  
>  	clk_disable_unprepare(dsi->pclk);
> +	if (dsi->slave)
> +		clk_disable_unprepare(dsi->slave->pclk);
>  
> -	if (mux)
> -		val = pdata->dsi0_en_bit | (pdata->dsi0_en_bit << 16);
> -	else
> -		val = pdata->dsi0_en_bit << 16;
> -
> -	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
> -	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
>  	dsi->dpms_mode = DRM_MODE_DPMS_ON;
> -
> -	clk_disable_unprepare(dsi->grf_clk);
>  }
>  
>  static int
> @@ -1073,6 +1180,9 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
>  
>  	s->output_type = DRM_MODE_CONNECTOR_DSI;
>  
> +	if (dsi->slave)
> +		s->output_flags = ROCKCHIP_OUTPUT_DSI_DUAL_CHANNEL;
> +
>  	return 0;
>  }
>  
> @@ -1178,6 +1288,12 @@ static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
>  	.grf_switch_reg = RK3399_GRF_SOC_CON20,
>  	.grf_dsi0_mode = RK3399_GRF_DSI_MODE,
>  	.grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
> +	.grf_dsi1_mode = RK3399_GRF_DSI1_MODE1,
> +	.grf_dsi1_mode_reg1 = RK3399_GRF_SOC_CON23,
> +	.dsi1_basedir = RK3399_TXRX_BASEDIR,
> +	.dsi1_masterslavez = RK3399_TXRX_MASTERSLAVEZ,
> +	.dsi1_enableclk = RK3399_TXRX_ENABLECLK,
> +	.grf_dsi1_mode_reg2 = RK3399_GRF_SOC_CON24,
>  	.flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
>  	.max_data_lanes = 4,
>  };
> @@ -1194,17 +1310,106 @@ static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
>  };
>  MODULE_DEVICE_TABLE(of, dw_mipi_dsi_dt_ids);
>  
> +
> +static int rockchip_dsi_dual_channel_probe(struct dw_mipi_dsi *dsi)
> +{
> +	struct device_node *np;
> +	struct platform_device *secondary;
> +
> +	np = of_parse_phandle(dsi->dev->of_node, "rockchip,dual-channel", 0);
> +	if (np) {
> +		secondary = of_find_device_by_node(np);
> +		dsi->slave = platform_get_drvdata(secondary);
> +		of_node_put(np);
> +
> +		if (!dsi->slave)
> +			return -EPROBE_DEFER;
> +
> +		dsi->slave->master = dsi;
> +	}
> +
> +	return 0;
> +}
> +
>  static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>  			    void *data)
>  {
> +	struct drm_device *drm = data;
> +	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = rockchip_dsi_dual_channel_probe(dsi);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(dsi->pllref_clk);
> +	if (ret) {
> +		dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
> +		return ret;
> +	}
> +
> +	pm_runtime_enable(dev);
> +
> +	if (dsi->master)
> +		return 0;
> +
> +	ret = dw_mipi_dsi_register(drm, dsi);
> +	if (ret) {
> +		dev_err(dev, "Failed to register mipi_dsi: %d\n", ret);
> +		goto err_pllref;
> +	}
> +
> +	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
> +	dsi->dsi_host.dev = dev;
> +	ret = mipi_dsi_host_register(&dsi->dsi_host);
> +	if (ret) {
> +		dev_err(dev, "Failed to register MIPI host: %d\n", ret);
> +		goto err_cleanup;
> +	}
> +
> +	if (!dsi->panel) {
> +		ret = -EPROBE_DEFER;
> +		goto err_mipi_dsi_host;
> +	}
> +
> +	return 0;
> +
> +err_mipi_dsi_host:
> +	mipi_dsi_host_unregister(&dsi->dsi_host);
> +err_cleanup:
> +	drm_encoder_cleanup(&dsi->encoder);
> +	drm_connector_cleanup(&dsi->connector);
> +err_pllref:

Do you need to disable pm runtime on dev?

> +	clk_disable_unprepare(dsi->pllref_clk);
> +	return ret;
> +}
> +
> +static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
> +			       void *data)
> +{
> +	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
> +
> +	mipi_dsi_host_unregister(&dsi->dsi_host);
> +	pm_runtime_disable(dev);
> +	if (dsi->slave)
> +		pm_runtime_disable(dsi->slave->dev);
> +	clk_disable_unprepare(dsi->pllref_clk);
> +}
> +
> +static const struct component_ops dw_mipi_dsi_ops = {
> +	.bind	= dw_mipi_dsi_bind,
> +	.unbind	= dw_mipi_dsi_unbind,
> +};
> +
> +static int dw_mipi_dsi_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
>  	const struct of_device_id *of_id =
>  			of_match_device(dw_mipi_dsi_dt_ids, dev);
>  	const struct dw_mipi_dsi_plat_data *pdata = of_id->data;
> -	struct platform_device *pdev = to_platform_device(dev);
> -	struct reset_control *apb_rst;
> -	struct drm_device *drm = data;
>  	struct dw_mipi_dsi *dsi;
>  	struct resource *res;
> +	struct reset_control *apb_rst;
>  	int ret;
>  
>  	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
> @@ -1214,6 +1419,7 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>  	dsi->dev = dev;
>  	dsi->pdata = pdata;
>  	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
> +	dev_set_drvdata(dev, dsi);
>  
>  	ret = rockchip_mipi_parse_dt(dsi);
>  	if (ret)
> @@ -1288,63 +1494,6 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>  		}
>  	}
>  
> -	ret = clk_prepare_enable(dsi->pllref_clk);
> -	if (ret) {
> -		dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
> -		return ret;
> -	}
> -
> -	ret = dw_mipi_dsi_register(drm, dsi);
> -	if (ret) {
> -		dev_err(dev, "Failed to register mipi_dsi: %d\n", ret);
> -		goto err_pllref;
> -	}
> -
> -	pm_runtime_enable(dev);
> -
> -	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
> -	dsi->dsi_host.dev = dev;
> -	ret = mipi_dsi_host_register(&dsi->dsi_host);
> -	if (ret) {
> -		dev_err(dev, "Failed to register MIPI host: %d\n", ret);
> -		goto err_cleanup;
> -	}
> -
> -	if (!dsi->panel) {
> -		ret = -EPROBE_DEFER;
> -		goto err_mipi_dsi_host;
> -	}
> -
> -	dev_set_drvdata(dev, dsi);
> -	return 0;
> -
> -err_mipi_dsi_host:
> -	mipi_dsi_host_unregister(&dsi->dsi_host);
> -err_cleanup:
> -	drm_encoder_cleanup(&dsi->encoder);
> -	drm_connector_cleanup(&dsi->connector);
> -err_pllref:
> -	clk_disable_unprepare(dsi->pllref_clk);
> -	return ret;
> -}
> -
> -static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
> -			       void *data)
> -{
> -	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
> -
> -	mipi_dsi_host_unregister(&dsi->dsi_host);
> -	pm_runtime_disable(dev);
> -	clk_disable_unprepare(dsi->pllref_clk);
> -}
> -
> -static const struct component_ops dw_mipi_dsi_ops = {
> -	.bind	= dw_mipi_dsi_bind,
> -	.unbind	= dw_mipi_dsi_unbind,
> -};
> -
> -static int dw_mipi_dsi_probe(struct platform_device *pdev)
> -{
>  	return component_add(&pdev->dev, &dw_mipi_dsi_ops);
>  }
>  
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> index c7e96b8..51ad1c2 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> @@ -36,6 +36,7 @@ struct rockchip_crtc_state {
>  	struct drm_crtc_state base;
>  	int output_type;
>  	int output_mode;
> +	int output_flags;
>  };
>  #define to_rockchip_crtc_state(s) \
>  		container_of(s, struct rockchip_crtc_state, base)
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index bf9ed0e..cb40cdd 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -917,6 +917,8 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc,
>  	case DRM_MODE_CONNECTOR_DSI:
>  		VOP_REG_SET(vop, output, mipi_pin_pol, pin_pol);
>  		VOP_REG_SET(vop, output, mipi_en, 1);
> +		VOP_REG_SET(vop, output, mipi_dual_channel_en,
> +			!!(s->output_flags & ROCKCHIP_OUTPUT_DSI_DUAL_CHANNEL));
>  		break;
>  	case DRM_MODE_CONNECTOR_DisplayPort:
>  		pin_pol &= ~BIT(DCLK_INVERT);
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> index 56bbd2e..d184531 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> @@ -60,6 +60,7 @@ struct vop_output {
>  	struct vop_reg edp_en;
>  	struct vop_reg hdmi_en;
>  	struct vop_reg mipi_en;
> +	struct vop_reg mipi_dual_channel_en;
>  	struct vop_reg rgb_en;
>  };
>  
> @@ -212,6 +213,8 @@ struct vop_data {
>  /* for use special outface */
>  #define ROCKCHIP_OUT_MODE_AAAA	15
>  
> +#define ROCKCHIP_OUTPUT_DSI_DUAL_CHANNEL	BIT(0)
> +
>  enum alpha_mode {
>  	ALPHA_STRAIGHT,
>  	ALPHA_INVERSE,
> -- 
> 1.9.1
> 
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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