[PATCH v8 05/10] drm: imx: Add i.MX 6 MIPI DSI host platform driver

[Adrian Ratiu <adrian.ratiu@collabora.com>]

This adds support for the Synopsis DesignWare MIPI DSI v1.01 host
controller which is embedded in i.MX 6 SoCs.

Based on following patches, but updated/extended to work with existing
support found in the kernel:

- drm: imx: Support Synopsys DesignWare MIPI DSI host controller
  Signed-off-by: Liu Ying <Ying.Liu@freescale.com>

Cc: Fabio Estevam <festevam@gmail.com>
Cc: Enric Balletbo Serra <eballetbo@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Adrian Pop <pop.adrian61@gmail.com>
Tested-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
---
Changes since v7:
  - Removed encoder helper ops and added drm_bridge (Laurent)
  - Brought back drm_simple_encoder_init and dropped dependency on
  external unify encoder creation patch (Laurent)
  - Minor typo fixes

Changes since v6:
  - Replaced custom noop encoder with the simple drm encoder (Enric)
  - Added CONFIG_DRM_IMX6_MIPI_DSI depends on CONFIG_OF (Enric)
  - Dropped imx_mipi_dsi_register() because now it only creates the
  dummy encoder which can easily be done directly in imx_dsi_bind()

Changes since v5:
  - Reword to remove unrelated device tree patch mention (Fabio)
  - Move pllref_clk enable/disable to bind/unbind (Ezequiel)
  - Fix freescale.com -> nxp.com email addresses (Fabio)
  - Also added myself as module author (Fabio)
  - Use DRM_DEV_* macros for consistency, print more error msg

Changes since v4:
  - Split off driver-specific configuration of phy timings due
  to new upstream API.
  - Move regmap infrastructure logic to separate commit (Ezequiel)
  - Move dsi v1.01 layout addition to a separate commit (Ezequiel)
  - Minor warnings and driver name fixes

Changes since v3:
  - Renamed platform driver to reflect it's i.MX6 only. (Fabio)

Changes since v2:
  - Fixed commit tags. (Emil)

Changes since v1:
  - Moved register definitions & regmap initialization into bridge
  module. Platform drivers get the regmap via plat_data after
  calling the bridge probe. (Emil)
---
 drivers/gpu/drm/imx/Kconfig            |   8 +
 drivers/gpu/drm/imx/Makefile           |   1 +
 drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c | 399 +++++++++++++++++++++++++
 3 files changed, 408 insertions(+)
 create mode 100644 drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c

diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index 207bf7409dfba..0dffc72df7922 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -39,3 +39,11 @@ config DRM_IMX_HDMI
 	depends on DRM_IMX
 	help
 	  Choose this if you want to use HDMI on i.MX6.
+
+config DRM_IMX6_MIPI_DSI
+	tristate "Freescale i.MX6 DRM MIPI DSI"
+	select DRM_DW_MIPI_DSI
+	depends on DRM_IMX
+	depends on OF
+	help
+	  Choose this if you want to use MIPI DSI on i.MX6.
diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
index 21cdcc2faabc8..9a7843c593478 100644
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
 obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
 
 obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
+obj-$(CONFIG_DRM_IMX6_MIPI_DSI) += dw_mipi_dsi-imx6.o
diff --git a/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c
new file mode 100644
index 0000000000000..492decc418bc3
--- /dev/null
+++ b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c
@@ -0,0 +1,399 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * i.MX6 drm driver - MIPI DSI Host Controller
+ *
+ * Copyright (C) 2011-2015 Freescale Semiconductor, Inc.
+ * Copyright (C) 2019-2020 Collabora, Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+#include <drm/bridge/dw_mipi_dsi.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include "imx-drm.h"
+
+#define DSI_PWR_UP			0x04
+#define RESET				0
+#define POWERUP				BIT(0)
+
+#define DSI_PHY_IF_CTRL			0x5c
+#define PHY_IF_CTRL_RESET		0x0
+
+#define DSI_PHY_TST_CTRL0		0x64
+#define PHY_TESTCLK			BIT(1)
+#define PHY_UNTESTCLK			0
+#define PHY_TESTCLR			BIT(0)
+#define PHY_UNTESTCLR			0
+
+#define DSI_PHY_TST_CTRL1		0x68
+#define PHY_TESTEN			BIT(16)
+#define PHY_UNTESTEN			0
+#define PHY_TESTDOUT(n)			(((n) & 0xff) << 8)
+#define PHY_TESTDIN(n)			(((n) & 0xff) << 0)
+
+struct imx_mipi_dsi {
+	struct drm_encoder encoder;
+	struct drm_bridge bridge;
+	struct device *dev;
+	struct regmap *mux_sel;
+	struct dw_mipi_dsi *mipi_dsi;
+	struct clk *pllref_clk;
+
+	void __iomem *base;
+	unsigned int lane_mbps;
+};
+
+struct dphy_pll_testdin_map {
+	unsigned int max_mbps;
+	u8 testdin;
+};
+
+/* The table is based on 27MHz DPHY pll reference clock. */
+static const struct dphy_pll_testdin_map dptdin_map[] = {
+	{160, 0x04}, {180, 0x24}, {200, 0x44}, {210, 0x06},
+	{240, 0x26}, {250, 0x46}, {270, 0x08}, {300, 0x28},
+	{330, 0x48}, {360, 0x2a}, {400, 0x4a}, {450, 0x0c},
+	{500, 0x2c}, {550, 0x0e}, {600, 0x2e}, {650, 0x10},
+	{700, 0x30}, {750, 0x12}, {800, 0x32}, {850, 0x14},
+	{900, 0x34}, {950, 0x54}, {1000, 0x74}
+};
+
+static inline struct imx_mipi_dsi *bridge_to_imxdsi(struct drm_bridge *br)
+{
+	return container_of(br, struct imx_mipi_dsi, bridge);
+}
+
+static int
+imx_mipi_dsi_bridge_atomic_check(struct drm_bridge *bridge,
+				 struct drm_bridge_state *bridge_state,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_connector_state *conn_state)
+{
+	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
+
+	/* The following values are taken from dw_hdmi_imx_atomic_check */
+	imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	imx_crtc_state->di_hsync_pin = 2;
+	imx_crtc_state->di_vsync_pin = 3;
+
+	return 0;
+}
+
+static void imx_mipi_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_st)
+{
+	struct imx_mipi_dsi *dsi = bridge_to_imxdsi(bridge);
+	int mux = drm_of_encoder_active_port_id(dsi->dev->of_node,
+						&dsi->encoder);
+	/* Set IOMUX DSI output reg to correct IPU 1 or 0 and DI 1 or 0 ports */
+	regmap_update_bits(dsi->mux_sel, IOMUXC_GPR3,
+			   IMX6Q_GPR3_MIPI_MUX_CTL_MASK,
+			   mux << IMX6Q_GPR3_MIPI_MUX_CTL_SHIFT);
+}
+
+static const struct drm_bridge_funcs imx_dsi_bridge_funcs = {
+	.atomic_enable = imx_mipi_dsi_bridge_atomic_enable,
+	.atomic_check = imx_mipi_dsi_bridge_atomic_check,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+};
+
+static enum drm_mode_status imx_mipi_dsi_mode_valid(void *priv_data,
+					const struct drm_display_mode *mode)
+{
+	/*
+	 * The VID_PKT_SIZE field in the DSI_VID_PKT_CFG
+	 * register is 11-bit.
+	 */
+	if (mode->hdisplay > 0x7ff)
+		return MODE_BAD_HVALUE;
+
+	/*
+	 * The V_ACTIVE_LINES field in the DSI_VTIMING_CFG
+	 * register is 11-bit.
+	 */
+	if (mode->vdisplay > 0x7ff)
+		return MODE_BAD_VVALUE;
+
+	return MODE_OK;
+}
+
+
+static unsigned int max_mbps_to_testdin(unsigned int max_mbps)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(dptdin_map); i++)
+		if (dptdin_map[i].max_mbps == max_mbps)
+			return dptdin_map[i].testdin;
+
+	return -EINVAL;
+}
+
+static inline void dsi_write(struct imx_mipi_dsi *dsi, u32 reg, u32 val)
+{
+	writel(val, dsi->base + reg);
+}
+
+static int imx_mipi_dsi_phy_init(void *priv_data)
+{
+	struct imx_mipi_dsi *dsi = priv_data;
+	int testdin;
+
+	testdin = max_mbps_to_testdin(dsi->lane_mbps);
+	if (testdin < 0) {
+		DRM_DEV_ERROR(dsi->dev,
+			      "failed to get testdin for %dmbps lane clock\n",
+			      dsi->lane_mbps);
+		return testdin;
+	}
+
+	dsi_write(dsi, DSI_PHY_IF_CTRL, PHY_IF_CTRL_RESET);
+	dsi_write(dsi, DSI_PWR_UP, POWERUP);
+
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
+		  PHY_TESTDIN(0x44));
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
+		  PHY_TESTDIN(testdin));
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
+
+	return 0;
+}
+
+static int imx_mipi_dsi_get_lane_mbps(void *priv_data,
+				      const struct drm_display_mode *mode,
+				      unsigned long mode_flags, u32 lanes,
+				      u32 format, unsigned int *lane_mbps)
+{
+	struct imx_mipi_dsi *dsi = priv_data;
+	int bpp;
+	unsigned int i, target_mbps, mpclk;
+	unsigned long pllref;
+
+	bpp = mipi_dsi_pixel_format_to_bpp(format);
+	if (bpp < 0) {
+		DRM_DEV_ERROR(dsi->dev, "failed to get bpp for format %d: %d\n",
+			      format, bpp);
+		return bpp;
+	}
+
+	pllref = clk_get_rate(dsi->pllref_clk);
+	if (pllref != 27000000)
+		DRM_WARN("DSI pllref_clk not set to 27Mhz\n");
+
+	mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
+	if (mpclk) {
+		/* take 1/0.7 blanking overhead into consideration */
+		target_mbps = (mpclk * (bpp / lanes) * 10) / 7;
+	} else {
+		DRM_DEV_ERROR(dsi->dev, "use default 1Gbps DPHY pll clock\n");
+		target_mbps = 1000;
+	}
+
+	DRM_DEV_DEBUG(dsi->dev, "target pllref_clk frequency is %uMbps\n",
+		      target_mbps);
+
+	for (i = 0; i < ARRAY_SIZE(dptdin_map); i++) {
+		if (target_mbps < dptdin_map[i].max_mbps) {
+			*lane_mbps = dptdin_map[i].max_mbps;
+			dsi->lane_mbps = *lane_mbps;
+			DRM_DEV_DEBUG(dsi->dev,
+				      "real pllref_clk frequency is %uMbps\n",
+				      *lane_mbps);
+			return 0;
+		}
+	}
+
+	DRM_DEV_ERROR(dsi->dev, "DPHY clock frequency %uMbps is out of range\n",
+		      target_mbps);
+
+	return -EINVAL;
+}
+
+static int
+dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
+			   struct dw_mipi_dsi_dphy_timing *timing)
+{
+	timing->clk_hs2lp = 0x40;
+	timing->clk_lp2hs = 0x40;
+	timing->data_hs2lp = 0x40;
+	timing->data_lp2hs = 0x40;
+
+	return 0;
+}
+
+static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_imx6_phy_ops = {
+	.init = imx_mipi_dsi_phy_init,
+	.get_lane_mbps = imx_mipi_dsi_get_lane_mbps,
+	.get_timing = dw_mipi_dsi_phy_get_timing,
+};
+
+static struct dw_mipi_dsi_plat_data imx6_mipi_dsi_drv_data = {
+	.max_data_lanes = 2,
+	.mode_valid = imx_mipi_dsi_mode_valid,
+	.phy_ops = &dw_mipi_dsi_imx6_phy_ops,
+};
+
+static const struct of_device_id imx_dsi_dt_ids[] = {
+	{
+		.compatible = "fsl,imx6-mipi-dsi",
+		.data = &imx6_mipi_dsi_drv_data,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_dsi_dt_ids);
+
+static int imx_mipi_dsi_bind(struct device *dev, struct device *master,
+			     void *data)
+{
+	struct imx_mipi_dsi *dsi = dev_get_drvdata(dev);
+	struct drm_device *drm = data;
+	int ret;
+
+	ret = clk_prepare_enable(dsi->pllref_clk);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Failed to enable pllref_clk: %d\n", ret);
+		return ret;
+	}
+
+	ret = imx_drm_encoder_parse_of(drm, &dsi->encoder, dsi->dev->of_node);
+	if (ret)
+		return ret;
+
+	ret = drm_simple_encoder_init(drm, &dsi->encoder, DRM_MODE_ENCODER_NONE);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "failed to create drm encoder\n");
+		return ret;
+	}
+
+	drm_bridge_add(&dsi->bridge);
+
+	drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
+	if (ret < 0) {
+		DRM_DEV_ERROR(dev, "failed to attach IMX6 bridge: %d\n", ret);
+		return ret;
+	}
+
+	ret = dw_mipi_dsi_bind(dsi->mipi_dsi, &dsi->encoder, &dsi->bridge);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Failed to bind: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void imx_mipi_dsi_unbind(struct device *dev, struct device *master,
+				void *data)
+{
+	struct imx_mipi_dsi *dsi = dev_get_drvdata(dev);
+
+	dw_mipi_dsi_unbind(dsi->mipi_dsi);
+
+	clk_disable_unprepare(dsi->pllref_clk);
+}
+
+static const struct component_ops imx_mipi_dsi_ops = {
+	.bind	= imx_mipi_dsi_bind,
+	.unbind	= imx_mipi_dsi_unbind,
+};
+
+static int imx_mipi_dsi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *of_id = of_match_device(imx_dsi_dt_ids, dev);
+	struct dw_mipi_dsi_plat_data *pdata = (struct dw_mipi_dsi_plat_data *) of_id->data;
+	struct imx_mipi_dsi *dsi;
+	struct resource *res;
+	int ret;
+
+	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+	if (!dsi)
+		return -ENOMEM;
+
+	dsi->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dsi->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(dsi->base)) {
+		ret = PTR_ERR(dsi->base);
+		DRM_DEV_ERROR(dev, "Unable to get dsi registers: %d\n", ret);
+		return ret;
+	}
+
+	dsi->pllref_clk = devm_clk_get(dev, "ref");
+	if (IS_ERR(dsi->pllref_clk)) {
+		ret = PTR_ERR(dsi->pllref_clk);
+		DRM_DEV_ERROR(dev, "Unable to get pllref_clk: %d\n", ret);
+		return ret;
+	}
+
+	dsi->mux_sel = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,gpr");
+	if (IS_ERR(dsi->mux_sel)) {
+		ret = PTR_ERR(dsi->mux_sel);
+		DRM_DEV_ERROR(dev, "Failed to get GPR regmap: %d\n", ret);
+		return ret;
+	}
+
+	dev_set_drvdata(dev, dsi);
+
+	imx6_mipi_dsi_drv_data.base = dsi->base;
+	imx6_mipi_dsi_drv_data.priv_data = dsi;
+
+	dsi->bridge.driver_private = dsi;
+	dsi->bridge.funcs = &imx_dsi_bridge_funcs;
+	dsi->bridge.of_node = dev->of_node;
+
+	dsi->mipi_dsi = dw_mipi_dsi_probe(pdev, pdata);
+	if (IS_ERR(dsi->mipi_dsi)) {
+		ret = PTR_ERR(dsi->mipi_dsi);
+		DRM_DEV_ERROR(dev, "Failed to probe DW DSI host: %d\n", ret);
+		goto err_clkdisable;
+	}
+
+	return component_add(&pdev->dev, &imx_mipi_dsi_ops);
+
+err_clkdisable:
+	clk_disable_unprepare(dsi->pllref_clk);
+	return ret;
+}
+
+static int imx_mipi_dsi_remove(struct platform_device *pdev)
+{
+	struct imx_mipi_dsi *dsi = platform_get_drvdata(pdev);
+	drm_bridge_remove(&dsi->bridge);
+	component_del(&pdev->dev, &imx_mipi_dsi_ops);
+	return 0;
+}
+
+static struct platform_driver imx_mipi_dsi_driver = {
+	.probe		= imx_mipi_dsi_probe,
+	.remove		= imx_mipi_dsi_remove,
+	.driver		= {
+		.of_match_table = imx_dsi_dt_ids,
+		.name	= "dw-mipi-dsi-imx6",
+	},
+};
+module_platform_driver(imx_mipi_dsi_driver);
+
+MODULE_DESCRIPTION("i.MX6 MIPI DSI host controller driver");
+MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
+MODULE_AUTHOR("Adrian Ratiu <adrian.ratiu@collabora.com>");
+MODULE_LICENSE("GPL");
-- 
2.26.0

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