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Subject: Re: [PATCH 3/6] drm/rockchip: dsi: add ability to work as a phy
 instead of full dsi
To:     Heiko Stuebner <heiko@sntech.de>, dri-devel@lists.freedesktop.org
Cc:     devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        hjc@rock-chips.com, robh+dt@kernel.org,
        sebastian.fricke@posteo.net, linux-media@vger.kernel.org,
        dafna.hirschfeld@collabora.com, ezequiel@collabora.com,
        cmuellner@linux.com,
        Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
References: <20210210111020.2476369-1-heiko@sntech.de>
 <20210210111020.2476369-4-heiko@sntech.de>
From:   Helen Koike <helen.koike@collabora.com>
Message-ID: <d7b8137c-66ce-935a-c8d7-e507146143d7@collabora.com>
Date:   Mon, 15 Feb 2021 11:33:19 -0300
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On 2/10/21 8:10 AM, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> 
> SoCs like the rk3288 and rk3399 have 3 mipi dphys on them. One is TX-
> only, one is RX-only and one can be configured to do either TX or RX.
> 
> The RX phy is statically connected to the first Image Signal Processor,
> the TX phy is statically connected to the first DSI controller and
> the TXRX phy is connected to both the second DSI controller as well
> as the second ISP.
> 
> The RX dphy is controlled externally through registers in the "General
> Register Files", while the other two are controlled through the
> "Configuration and Test Interface" inside their DSI controller's
> io-memory area.
> 
> The Rockchip dw-dsi controller already controls these dphys for the
> TX case in the driver, but when we want to also allow configuration
> for RX to the ISP from the media subsystem we need to expose phy-
> functionality instead.
> 
> So add a bit of infrastructure to allow the dsi driver to work as a
> phy and make sure it can be only one or the other at a time.
> 
> Similarly as the dsi-controller will be part of the drm-graph when
> active, add an empty component to the drm-graph when in phy-mode
> to make the rest of the drm-graph not wait for it.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> Tested-by: Sebastian Fricke <sebastian.fricke@posteo.net>
> ---
>   drivers/gpu/drm/rockchip/Kconfig              |   2 +
>   .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c   | 341 ++++++++++++++++++
>   2 files changed, 343 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index cb25c0e8fc9b..3094d4533ad6 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -9,6 +9,8 @@ config DRM_ROCKCHIP
>   	select DRM_ANALOGIX_DP if ROCKCHIP_ANALOGIX_DP
>   	select DRM_DW_HDMI if ROCKCHIP_DW_HDMI
>   	select DRM_DW_MIPI_DSI if ROCKCHIP_DW_MIPI_DSI
> +	select GENERIC_PHY if ROCKCHIP_DW_MIPI_DSI
> +	select GENERIC_PHY_MIPI_DPHY if ROCKCHIP_DW_MIPI_DSI

maybe alphabetical order?

>   	select DRM_RGB if ROCKCHIP_RGB
>   	select SND_SOC_HDMI_CODEC if ROCKCHIP_CDN_DP && SND_SOC
>   	help
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> index 18e112e30f6e..e322749a5279 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> @@ -14,6 +14,7 @@
>   #include <linux/of_device.h>
>   #include <linux/phy/phy.h>
>   #include <linux/pm_runtime.h>
> +#include <linux/phy/phy.h>
>   #include <linux/regmap.h>
>   
>   #include <video/mipi_display.h>
> @@ -125,7 +126,9 @@
>   #define BANDGAP_AND_BIAS_CONTROL			0x20
>   #define TERMINATION_RESISTER_CONTROL			0x21
>   #define AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY		0x22
> +#define HS_RX_CONTROL_OF_LANE_CLK			0x34
>   #define HS_RX_CONTROL_OF_LANE_0				0x44
> +#define HS_RX_CONTROL_OF_LANE_1				0x54
>   #define HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL	0x60
>   #define HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL	0x61
>   #define HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL	0x62
> @@ -137,6 +140,9 @@
>   #define HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL	0x72
>   #define HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL	0x73
>   #define HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL		0x74
> +#define HS_RX_DATA_LANE_THS_SETTLE_CONTROL		0x75
> +#define HS_RX_CONTROL_OF_LANE_2				0x84
> +#define HS_RX_CONTROL_OF_LANE_3				0x94
>   
>   #define DW_MIPI_NEEDS_PHY_CFG_CLK	BIT(0)
>   #define DW_MIPI_NEEDS_GRF_CLK		BIT(1)
> @@ -171,11 +177,19 @@
>   #define RK3399_TXRX_MASTERSLAVEZ	BIT(7)
>   #define RK3399_TXRX_ENABLECLK		BIT(6)
>   #define RK3399_TXRX_BASEDIR		BIT(5)
> +#define RK3399_TXRX_SRC_SEL_ISP0	BIT(4)
> +#define RK3399_TXRX_TURNREQUEST		GENMASK(3, 0)
>   
>   #define HIWORD_UPDATE(val, mask)	(val | (mask) << 16)
>   
>   #define to_dsi(nm)	container_of(nm, struct dw_mipi_dsi_rockchip, nm)
>   
> +enum {
> +	DW_DSI_USAGE_IDLE,
> +	DW_DSI_USAGE_DSI,
> +	DW_DSI_USAGE_PHY,
> +};
> +
>   enum {
>   	BANDGAP_97_07,
>   	BANDGAP_98_05,
> @@ -213,6 +227,10 @@ struct rockchip_dw_dsi_chip_data {
>   	u32 lanecfg2_grf_reg;
>   	u32 lanecfg2;
>   
> +	int (*dphy_rx_init)(struct phy *phy);
> +	int (*dphy_rx_power_on)(struct phy *phy);
> +	int (*dphy_rx_power_off)(struct phy *phy);
> +
>   	unsigned int flags;
>   	unsigned int max_data_lanes;
>   };
> @@ -236,6 +254,12 @@ struct dw_mipi_dsi_rockchip {
>   	struct phy *phy;
>   	union phy_configure_opts phy_opts;
>   
> +	/* being a phy for other mipi hosts */
> +	unsigned int usage_mode;
> +	struct mutex usage_mutex;
> +	struct phy *dphy;
> +	struct phy_configure_opts_mipi_dphy dphy_config;
> +
>   	unsigned int lane_mbps; /* per lane */
>   	u16 input_div;
>   	u16 feedback_div;
> @@ -965,6 +989,17 @@ static int dw_mipi_dsi_rockchip_host_attach(void *priv_data,
>   	struct device *second;
>   	int ret;
>   
> +	mutex_lock(&dsi->usage_mutex);
> +
> +	if (dsi->usage_mode != DW_DSI_USAGE_IDLE) {
> +		DRM_DEV_ERROR(dsi->dev, "dsi controller already in use\n");
> +		mutex_unlock(&dsi->usage_mutex);
> +		return -EBUSY;
> +	}
> +
> +	dsi->usage_mode = DW_DSI_USAGE_DSI;
> +	mutex_unlock(&dsi->usage_mutex);
> +
>   	ret = component_add(dsi->dev, &dw_mipi_dsi_rockchip_ops);
>   	if (ret) {
>   		DRM_DEV_ERROR(dsi->dev, "Failed to register component: %d\n",
> @@ -1000,6 +1035,10 @@ static int dw_mipi_dsi_rockchip_host_detach(void *priv_data,
>   
>   	component_del(dsi->dev, &dw_mipi_dsi_rockchip_ops);
>   
> +	mutex_lock(&dsi->usage_mutex);
> +	dsi->usage_mode = DW_DSI_USAGE_IDLE;
> +	mutex_unlock(&dsi->usage_mutex);
> +
>   	return 0;
>   }
>   
> @@ -1008,11 +1047,227 @@ static const struct dw_mipi_dsi_host_ops dw_mipi_dsi_rockchip_host_ops = {
>   	.detach = dw_mipi_dsi_rockchip_host_detach,
>   };
>   
> +static int dw_mipi_dsi_rockchip_dphy_bind(struct device *dev,
> +					  struct device *master,
> +					  void *data)
> +{
> +	/*
> +	 * Nothing to do when used as a dphy.
> +	 * Just make the rest of Rockchip-DRM happy
> +	 * by being here.
> +	 */
> +
> +	return 0;
> +}
> +
> +static void dw_mipi_dsi_rockchip_dphy_unbind(struct device *dev,
> +					     struct device *master,
> +					     void *data)
> +{
> +	/* Nothing to do when used as a dphy. */
> +}
> +
> +static const struct component_ops dw_mipi_dsi_rockchip_dphy_ops = {
> +	.bind	= dw_mipi_dsi_rockchip_dphy_bind,
> +	.unbind	= dw_mipi_dsi_rockchip_dphy_unbind,
> +};
> +
> +static int dw_mipi_dsi_dphy_init(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +	int ret;
> +
> +	mutex_lock(&dsi->usage_mutex);
> +
> +	if (dsi->usage_mode != DW_DSI_USAGE_IDLE) {
> +		DRM_DEV_ERROR(dsi->dev, "dsi controller already in use\n");
> +		mutex_unlock(&dsi->usage_mutex);
> +		return -EBUSY;
> +	}
> +
> +	dsi->usage_mode = DW_DSI_USAGE_PHY;
> +	mutex_unlock(&dsi->usage_mutex);
> +
> +	ret = component_add(dsi->dev, &dw_mipi_dsi_rockchip_dphy_ops);
> +	if (ret < 0)
> +		goto err_graph;
> +
> +	if (dsi->cdata->dphy_rx_init) {
> +		ret = clk_prepare_enable(dsi->pclk);
> +		if (ret < 0)
> +			goto err_init;
> +
> +		ret = clk_prepare_enable(dsi->grf_clk);
> +		if (ret) {
> +			clk_disable_unprepare(dsi->pclk);
> +			goto err_init;
> +		}
> +
> +		ret = dsi->cdata->dphy_rx_init(phy);
> +		clk_disable_unprepare(dsi->grf_clk);
> +		clk_disable_unprepare(dsi->pclk);
> +		if (ret < 0)
> +			goto err_init;
> +	}
> +
> +	return 0;
> +
> +err_init:
> +	component_del(dsi->dev, &dw_mipi_dsi_rockchip_dphy_ops);
> +err_graph:
> +	mutex_lock(&dsi->usage_mutex);
> +	dsi->usage_mode = DW_DSI_USAGE_IDLE;
> +	mutex_unlock(&dsi->usage_mutex);
> +
> +	return ret;
> +}
> +
> +static int dw_mipi_dsi_dphy_exit(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +
> +	component_del(dsi->dev, &dw_mipi_dsi_rockchip_dphy_ops);
> +
> +	mutex_lock(&dsi->usage_mutex);
> +	dsi->usage_mode = DW_DSI_USAGE_IDLE;
> +	mutex_unlock(&dsi->usage_mutex);
> +
> +	return 0;
> +}
> +
> +static int dw_mipi_dsi_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
> +{
> +	struct phy_configure_opts_mipi_dphy *config = &opts->mipi_dphy;
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
> +	if (ret)
> +		return ret;
> +
> +	dsi->dphy_config = *config;
> +	dsi->lane_mbps = div_u64(config->hs_clk_rate, 1000 * 1000 * 1);
> +
> +	return 0;
> +}
> +
> +static int dw_mipi_dsi_dphy_power_on(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +	int i, ret;

It seems "i" could be removed, use ret instead.

In general, the patch doesn't look wrong to me.

For the whole serie:
Acked-by: Helen Koike <helen.koike@collabora.com>

Thanks
Helen

> +
> +	DRM_DEV_DEBUG(dsi->dev, "lanes %d - data_rate_mbps %u\n",
> +		      dsi->dphy_config.lanes, dsi->lane_mbps);
> +
> +	i = max_mbps_to_parameter(dsi->lane_mbps);
> +	if (i < 0) {
> +		DRM_DEV_ERROR(dsi->dev, "failed to get parameter for %dmbps clock\n",
> +			      dsi->lane_mbps);
> +		return i;
> +	}
> +
> +	ret = pm_runtime_get_sync(dsi->dev);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(dsi->dev, "failed to enable device: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(dsi->pclk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable pclk: %d\n", ret);
> +		goto err_pclk;
> +	}
> +
> +	ret = clk_prepare_enable(dsi->grf_clk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> +		goto err_grf_clk;
> +	}
> +
> +	ret = clk_prepare_enable(dsi->phy_cfg_clk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable phy_cfg_clk: %d\n", ret);
> +		goto err_phy_cfg_clk;
> +	}
> +
> +	/* do soc-variant specific init */
> +	if (dsi->cdata->dphy_rx_power_on) {
> +		ret = dsi->cdata->dphy_rx_power_on(phy);
> +		if (ret < 0) {
> +			DRM_DEV_ERROR(dsi->dev, "hardware-specific phy bringup failed: %d\n", ret);
> +			goto err_pwr_on;
> +		}
> +	}
> +
> +	/*
> +	 * Configure hsfreqrange according to frequency values
> +	 * Set clock lane and hsfreqrange by lane0(test code 0x44)
> +	 */
> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_CLK, 0);
> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_0,
> +			      HSFREQRANGE_SEL(dppa_map[i].hsfreqrange));
> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_1, 0);
> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_2, 0);
> +	dw_mipi_dsi_phy_write(dsi, HS_RX_CONTROL_OF_LANE_3, 0);
> +
> +	/* Normal operation */
> +	dw_mipi_dsi_phy_write(dsi, 0x0, 0);
> +
> +	clk_disable_unprepare(dsi->phy_cfg_clk);
> +	clk_disable_unprepare(dsi->grf_clk);
> +
> +	return ret;
> +
> +err_pwr_on:
> +	clk_disable_unprepare(dsi->phy_cfg_clk);
> +err_phy_cfg_clk:
> +	clk_disable_unprepare(dsi->grf_clk);
> +err_grf_clk:
> +	clk_disable_unprepare(dsi->pclk);
> +err_pclk:
> +	pm_runtime_put(dsi->dev);
> +	return ret;
> +}
> +
> +static int dw_mipi_dsi_dphy_power_off(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = clk_prepare_enable(dsi->grf_clk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (dsi->cdata->dphy_rx_power_off) {
> +		ret = dsi->cdata->dphy_rx_power_off(phy);
> +		if (ret < 0)
> +			DRM_DEV_ERROR(dsi->dev, "hardware-specific phy shutdown failed: %d\n", ret);
> +	}
> +
> +	clk_disable_unprepare(dsi->grf_clk);
> +	clk_disable_unprepare(dsi->pclk);
> +
> +	pm_runtime_put(dsi->dev);
> +
> +	return ret;
> +}
> +
> +static const struct phy_ops dw_mipi_dsi_dphy_ops = {
> +	.configure	= dw_mipi_dsi_dphy_configure,
> +	.power_on	= dw_mipi_dsi_dphy_power_on,
> +	.power_off	= dw_mipi_dsi_dphy_power_off,
> +	.init		= dw_mipi_dsi_dphy_init,
> +	.exit		= dw_mipi_dsi_dphy_exit,
> +};
> +
>   static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct device_node *np = dev->of_node;
>   	struct dw_mipi_dsi_rockchip *dsi;
> +	struct phy_provider *phy_provider;
>   	struct resource *res;
>   	const struct rockchip_dw_dsi_chip_data *cdata =
>   				of_device_get_match_data(dev);
> @@ -1109,6 +1364,19 @@ static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
>   	dsi->pdata.priv_data = dsi;
>   	platform_set_drvdata(pdev, dsi);
>   
> +	mutex_init(&dsi->usage_mutex);
> +
> +	dsi->dphy = devm_phy_create(dev, NULL, &dw_mipi_dsi_dphy_ops);
> +	if (IS_ERR(dsi->dphy)) {
> +		DRM_DEV_ERROR(&pdev->dev, "failed to create PHY\n");
> +		return PTR_ERR(dsi->dphy);
> +	}
> +
> +	phy_set_drvdata(dsi->dphy, dsi);
> +	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	if (IS_ERR(phy_provider))
> +		return PTR_ERR(phy_provider);
> +
>   	dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata);
>   	if (IS_ERR(dsi->dmd)) {
>   		ret = PTR_ERR(dsi->dmd);
> @@ -1175,6 +1443,75 @@ static const struct rockchip_dw_dsi_chip_data rk3288_chip_data[] = {
>   	{ /* sentinel */ }
>   };
>   
> +static int rk3399_dphy_tx1rx1_init(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +
> +	/*
> +	 * Set TX1RX1 source to isp1.
> +	 * Assume ISP0 is supplied by the RX0 dphy.
> +	 */
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(0, RK3399_TXRX_SRC_SEL_ISP0));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(0, RK3399_TXRX_MASTERSLAVEZ));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(0, RK3399_TXRX_BASEDIR));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(0, RK3399_DSI1_ENABLE));
> +
> +	return 0;
> +}
> +
> +static int rk3399_dphy_tx1rx1_power_on(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +
> +	/* tester reset pulse */
> +	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_TESTCLR);
> +	usleep_range(100, 150);
> +
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(0, RK3399_TXRX_MASTERSLAVEZ));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(RK3399_TXRX_BASEDIR, RK3399_TXRX_BASEDIR));
> +
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(0, RK3399_DSI1_FORCERXMODE));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(0, RK3399_DSI1_FORCETXSTOPMODE));
> +
> +	/* Disable lane turn around, which is ignored in receive mode */
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON24,
> +		     HIWORD_UPDATE(0, RK3399_TXRX_TURNREQUEST));
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(RK3399_DSI1_TURNDISABLE,
> +				   RK3399_DSI1_TURNDISABLE));
> +	usleep_range(100, 150);
> +
> +	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
> +	usleep_range(100, 150);
> +
> +	/* Enable dphy lanes */
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(GENMASK(dsi->dphy_config.lanes - 1, 0),
> +				   RK3399_DSI1_ENABLE));
> +
> +	usleep_range(100, 150);
> +
> +	return 0;
> +}
> +
> +static int rk3399_dphy_tx1rx1_power_off(struct phy *phy)
> +{
> +	struct dw_mipi_dsi_rockchip *dsi = phy_get_drvdata(phy);
> +
> +	regmap_write(dsi->grf_regmap, RK3399_GRF_SOC_CON23,
> +		     HIWORD_UPDATE(0, RK3399_DSI1_ENABLE));
> +
> +	return 0;
> +}
> +
>   static const struct rockchip_dw_dsi_chip_data rk3399_chip_data[] = {
>   	{
>   		.reg = 0xff960000,
> @@ -1217,6 +1554,10 @@ static const struct rockchip_dw_dsi_chip_data rk3399_chip_data[] = {
>   
>   		.flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
>   		.max_data_lanes = 4,
> +
> +		.dphy_rx_init = rk3399_dphy_tx1rx1_init,
> +		.dphy_rx_power_on = rk3399_dphy_tx1rx1_power_on,
> +		.dphy_rx_power_off = rk3399_dphy_tx1rx1_power_off,
>   	},
>   	{ /* sentinel */ }
>   };
>