[RFC PATCH V2 2/2] drm: xlnx: dsi: driver for Xilinx DSI TX subsystem
From: Venkateshwar Rao Gannavarapu
Date: Mon Aug 10 2020 - 20:46:53 EST
The Xilinx MIPI DSI TX subsystem soft IP is used to display video
data from AXI-4 stream interface.
It supports upto 4 lanes, multiple RGB color formats, video mode
and command mode. The driver provides the kernel mode setting and
MIPI DSI host functionalities.
Signed-off-by: Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@xxxxxxxxxx>
---
drivers/gpu/drm/xlnx/Kconfig | 11 +
drivers/gpu/drm/xlnx/Makefile | 2 +
drivers/gpu/drm/xlnx/xlnx_dsi.c | 701 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 714 insertions(+)
create mode 100644 drivers/gpu/drm/xlnx/xlnx_dsi.c
diff --git a/drivers/gpu/drm/xlnx/Kconfig b/drivers/gpu/drm/xlnx/Kconfig
index aa6cd88..991bb37 100644
--- a/drivers/gpu/drm/xlnx/Kconfig
+++ b/drivers/gpu/drm/xlnx/Kconfig
@@ -11,3 +11,14 @@ config DRM_ZYNQMP_DPSUB
This is a DRM/KMS driver for ZynqMP DisplayPort controller. Choose
this option if you have a Xilinx ZynqMP SoC with DisplayPort
subsystem.
+
+config DRM_XLNX_DSI
+ tristate "Xilinx DRM DSI Subsystem Driver"
+ select DRM_MIPI_DSI
+ select DRM_PANEL
+ select DRM_PANEL_SIMPLE
+ help
+ DRM KMS driver for Xilinx programmable DSI subsystem controller.
+ Choose this option if you have a Xilinx MIPI DSI-TX in video
+ pipeline. The driver provides the kernel mode settings and MIPI
+ DSI host functionalities.
diff --git a/drivers/gpu/drm/xlnx/Makefile b/drivers/gpu/drm/xlnx/Makefile
index 2b844c6..b7ee6ef 100644
--- a/drivers/gpu/drm/xlnx/Makefile
+++ b/drivers/gpu/drm/xlnx/Makefile
@@ -1,2 +1,4 @@
zynqmp-dpsub-objs += zynqmp_disp.o zynqmp_dpsub.o zynqmp_dp.o
obj-$(CONFIG_DRM_ZYNQMP_DPSUB) += zynqmp-dpsub.o
+
+obj-$(CONFIG_DRM_XLNX_DSI) += xlnx_dsi.o
diff --git a/drivers/gpu/drm/xlnx/xlnx_dsi.c b/drivers/gpu/drm/xlnx/xlnx_dsi.c
new file mode 100644
index 0000000..3231043
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/xlnx_dsi.c
@@ -0,0 +1,701 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx FPGA MIPI DSI Tx Controller driver
+ *
+ * Copyright (C) 2017 - 2019 Xilinx, Inc.
+ *
+ * Authors:
+ * - Saurabh Sengar <saurabhs@xxxxxxxxxx>
+ * - Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@xxxxxxxxxx>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/iopoll.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+
+#include <video/mipi_display.h>
+#include <video/videomode.h>
+
+/* DSI Tx IP registers */
+#define XDSI_CCR 0x00
+#define XDSI_CCR_COREENB BIT(0)
+#define XDSI_CCR_SOFTRST BIT(1)
+#define XDSI_CCR_CRREADY BIT(2)
+#define XDSI_CCR_CMDMODE BIT(3)
+#define XDSI_CCR_DFIFORST BIT(4)
+#define XDSI_CCR_CMDFIFORST BIT(5)
+#define XDSI_PCR 0x04
+#define XDSI_PCR_VIDEOMODE(x) (((x) & 0x3) << 3)
+#define XDSI_PCR_VIDEOMODE_MASK (0x3 << 3)
+#define XDSI_PCR_VIDEOMODE_SHIFT 3
+#define XDSI_PCR_BLLPTYPE(x) ((x) << 5)
+#define XDSI_PCR_BLLPMODE(x) ((x) << 6)
+#define XDSI_PCR_EOTPENABLE(x) ((x) << 13)
+#define XDSI_GIER 0x20
+#define XDSI_ISR 0x24
+#define XDSI_IER 0x28
+#define XDSI_STR 0x2C
+#define XDSI_STR_RDY_SHPKT BIT(6)
+#define XDSI_STR_RDY_LNGPKT BIT(7)
+#define XDSI_STR_DFIFO_FULL BIT(8)
+#define XDSI_STR_DFIFO_EMPTY BIT(9)
+#define XDSI_STR_WAITFR_DATA BIT(10)
+#define XDSI_STR_CMD_EXE_PGS BIT(11)
+#define XDSI_STR_CCMD_PROC BIT(12)
+#define XDSI_STR_LPKT_MASK (0x5 << 7)
+#define XDSI_CMD 0x30
+#define XDSI_CMD_QUEUE_PACKET(x) ((x) & GENMASK(23, 0))
+#define XDSI_DFR 0x34
+#define XDSI_TIME1 0x50
+#define XDSI_TIME1_BLLP_BURST(x) ((x) & GENMASK(15, 0))
+#define XDSI_TIME1_HSA(x) (((x) & GENMASK(15, 0)) << 16)
+#define XDSI_TIME2 0x54
+#define XDSI_TIME2_VACT(x) ((x) & GENMASK(15, 0))
+#define XDSI_TIME2_HACT(x) (((x) & GENMASK(15, 0)) << 16)
+#define XDSI_HACT_MULTIPLIER GENMASK(1, 0)
+#define XDSI_TIME3 0x58
+#define XDSI_TIME3_HFP(x) ((x) & GENMASK(15, 0))
+#define XDSI_TIME3_HBP(x) (((x) & GENMASK(15, 0)) << 16)
+#define XDSI_TIME4 0x5c
+#define XDSI_TIME4_VFP(x) ((x) & GENMASK(7, 0))
+#define XDSI_TIME4_VBP(x) (((x) & GENMASK(7, 0)) << 8)
+#define XDSI_TIME4_VSA(x) (((x) & GENMASK(7, 0)) << 16)
+#define XDSI_LTIME 0x60
+#define XDSI_BLLP_TIME 0x64
+/*
+ * XDSI_NUM_DATA_T represents number of data types in the
+ * enum mipi_dsi_pixel_format in the MIPI DSI part of DRM framework.
+ */
+#define XDSI_NUM_DATA_T 4
+
+#define XDSI_DPHY_CLK_MIN 197000000000UL
+#define XDSI_DPHY_CLK_MAX 203000000000UL
+#define XDSI_DPHY_CLK_REQ 200000000000UL
+
+/* command timeout in usec */
+#define XDSI_CMD_TIMEOUT_VAL (3000)
+
+/**
+ * struct xlnx_dsi - Xilinx DSI-TX core
+ * @encoder: DRM encoder structure
+ * @dsi_host: DSI host device
+ * @connector: DRM connector structure
+ * @panel_node: MIPI DSI device panel node
+ * @panel: DRM panel structure
+ * @dev: device structure
+ * @iomem: Base address of DSI subsystem
+ * @lanes: number of active data lanes supported by DSI controller
+ * @cmdmode: command mode support
+ * @mode_flags: DSI operation mode related flags
+ * @format: pixel format for video mode of DSI controller
+ * @mul_factor: multiplication factor for HACT timing parameter
+ * @video_aclk: Video clock
+ * @dphy_clk_200M: 200MHz DPHY clock and AXI Lite clock
+ */
+struct xlnx_dsi {
+ struct drm_encoder encoder;
+ struct mipi_dsi_host dsi_host;
+ struct drm_connector connector;
+ struct device_node *panel_node;
+ struct drm_panel *panel;
+ struct device *dev;
+ void __iomem *iomem;
+ u32 lanes;
+ bool cmdmode;
+ u32 mode_flags;
+ enum mipi_dsi_pixel_format format;
+ u32 mul_factor;
+ struct clk *video_aclk;
+ struct clk *dphy_clk_200M;
+};
+
+#define host_to_dsi(host) container_of(host, struct xlnx_dsi, dsi_host)
+#define connector_to_dsi(c) container_of(c, struct xlnx_dsi, connector)
+#define encoder_to_dsi(e) container_of(e, struct xlnx_dsi, encoder)
+
+static inline void xlnx_dsi_writel(void __iomem *base, int offset, u32 val)
+{
+ writel(val, base + offset);
+}
+
+static inline u32 xlnx_dsi_readl(void __iomem *base, int offset)
+{
+ return readl(base + offset);
+}
+
+/**
+ * xlnx_dsi_host_transfer - transfer command to panel
+ * @host: mipi dsi host structure
+ * @msg: mipi dsi msg with type, length and data
+ *
+ * This function is valid only in command mode.
+ * It checks the command fifo empty status and writes into
+ * data or cmd register and waits for the completion status.
+ *
+ * Return: number of bytes, on success and error number on failure
+ */
+static ssize_t xlnx_dsi_host_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct xlnx_dsi *dsi = host_to_dsi(host);
+ u32 data, cmd0, val, offset;
+ int status;
+ const char *tx_buf = msg->tx_buf;
+
+ switch (msg->type) {
+ case MIPI_DSI_DCS_LONG_WRITE:
+ case MIPI_DSI_DCS_GENERIC_LONG_WRITE:
+ status = readl_poll_timeout(dsi->iomem + XDSI_STR, val,
+ (val & XDSI_STR_LPKT_MASK ==
+ XDSI_STR_LPKT_MASK), 1,
+ XDSI_CMD_TIMEOUT_VAL);
+ if (status) {
+ dev_err(dsi->dev, "long cmd fifo not empty!\n");
+ return -EBUSY;
+ }
+ cmd0 = msg->type | (msg->tx_len << 8);
+ xlnx_dsi_writel(dsi->iomem, XDSI_CMD, cmd0);
+
+ for (offset = 0; offset <= msg->tx_len; offset += 4, data = 0) {
+ data = tx_buf[0 + offset] | tx_buf[1 + offset] << 8 |
+ tx_buf[2 + offset] << 16 |
+ tx_buf[3 + offset] << 24;
+ xlnx_dsi_writel(dsi->iomem, XDSI_DFR, data);
+ }
+ break;
+ case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
+ status = readl_poll_timeout(dsi->iomem + XDSI_STR, val,
+ (val & XDSI_STR_RDY_SHPKT ==
+ XDSI_STR_RDY_SHPKT), 1,
+ XDSI_CMD_TIMEOUT_VAL);
+ if (status) {
+ dev_err(dsi->dev, "short cmd fifo not empty\n");
+ return -EBUSY;
+ }
+ data = MIPI_DSI_DCS_SHORT_WRITE_PARAM |
+ (tx_buf[0] << 8) | (tx_buf[1] << 16);
+ xlnx_dsi_writel(dsi->iomem, XDSI_CMD, data);
+ break;
+ case MIPI_DSI_DCS_SHORT_WRITE:
+ status = readl_poll_timeout(dsi->iomem + XDSI_STR, val,
+ (val & XDSI_STR_RDY_SHPKT ==
+ XDSI_STR_RDY_SHPKT), 1,
+ XDSI_CMD_TIMEOUT_VAL);
+ if (status) {
+ dev_err(dsi->dev, "short cmd fifo not empty\n");
+ return -EBUSY;
+ }
+ data = MIPI_DSI_DCS_SHORT_WRITE | (tx_buf[0] << 8);
+ xlnx_dsi_writel(dsi->iomem, XDSI_CMD, data);
+ break;
+ case default:
+ dev_err(dsi->dev, "Unsupported command type\n");
+ return -EINVAL;
+ }
+
+ status = readl_poll_timeout(dsi->iomem + XDSI_STR, val,
+ !(val & XDSI_STR_CMD_EXE_PGS), 1,
+ XDSI_CMD_TIMEOUT_VAL);
+ if (status) {
+ dev_err(dsi->dev, "cmd timeout\n");
+ return status;
+ }
+
+ return msg->tx_len;
+}
+
+static int xlnx_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ u32 panel_lanes = device->lanes;
+ struct xlnx_dsi *dsi = host_to_dsi(host);
+
+ dsi->mode_flags = device->mode_flags;
+ dsi->panel_node = device->dev.of_node;
+
+ if (panel_lanes != dsi->lanes) {
+ dev_err(dsi->dev, "Mismatch of lanes. panel = %d, DSI = %d\n",
+ panel_lanes, dsi->lanes);
+ return -EINVAL;
+ }
+
+ if (device->format != dsi->format) {
+ dev_err(dsi->dev, "Mismatch of format. panel = %d, DSI = %d\n",
+ device->format, dsi->format);
+ return -EINVAL;
+ }
+
+ if (dsi->connector.dev)
+ drm_helper_hpd_irq_event(dsi->connector.dev);
+
+ dsi->panel = of_drm_find_panel(dsi->panel_node);
+ if (IS_ERR(dsi->panel)) {
+ dsi->panel = NULL;
+ } else {
+ drm_panel_attach(dsi->panel, &dsi->connector);
+ dsi->connector.status = connector_status_connected;
+ }
+
+ return 0;
+}
+
+static int xlnx_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct xlnx_dsi *dsi = host_to_dsi(host);
+
+ if (dsi->panel) {
+ drm_panel_detach(dsi->panel);
+ dsi->panel = NULL;
+ }
+
+ if (dsi->connector.dev)
+ drm_helper_hpd_irq_event(dsi->connector.dev);
+
+ return 0;
+}
+
+static const struct mipi_dsi_host_ops xlnx_dsi_ops = {
+ .attach = xlnx_dsi_host_attach,
+ .detach = xlnx_dsi_host_detach,
+ .transfer = xlnx_dsi_host_transfer,
+};
+
+static int xlnx_dsi_connector_dpms(struct drm_connector *connector,
+ int mode)
+{
+ struct xlnx_dsi *dsi = connector_to_dsi(connector);
+ int ret;
+
+ dev_dbg(dsi->dev, "connector dpms state: %d\n", mode);
+
+ switch (mode) {
+ case DRM_MODE_DPMS_ON:
+ ret = drm_panel_enable(dsi->panel);
+ if (ret < 0) {
+ drm_panel_unprepare(dsi->panel);
+ dev_err(dsi->dev, "DRM panel not enabled\n");
+ return ret;
+ }
+ break;
+ default:
+ drm_panel_disable(dsi->panel);
+ drm_panel_unprepare(dsi->panel);
+ break;
+ }
+
+ return drm_helper_connector_dpms(connector, mode);
+}
+
+static enum drm_connector_status
+xlnx_dsi_detect(struct drm_connector *connector, bool force)
+{
+ struct xlnx_dsi *dsi = connector_to_dsi(connector);
+
+ if (dsi->panel) {
+ if (dsi->cmdmode)
+ xlnx_dsi_writel(dsi->iomem, XDSI_CCR,
+ XDSI_CCR_CMDMODE | XDSI_CCR_COREENB);
+ ret = drm_panel_prepare(dsi->panel);
+ if (ret < 0) {
+ dev_err(dsi->dev, "DRM panel not found\n");
+ return ret;
+ }
+ xlnx_dsi_writel(dsi->iomem, XDSI_CCR, 0);
+ return connector_status_connected;
+ } else if (!dsi->panel_node) {
+ xlnx_dsi_connector_dpms(connector, DRM_MODE_DPMS_OFF);
+ drm_panel_detach(dsi->panel);
+ dsi->panel = NULL;
+ }
+
+ return connector_status_disconnected;
+}
+
+static void xlnx_dsi_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+ connector->dev = NULL;
+}
+
+static const struct drm_connector_funcs xlnx_dsi_connector_funcs = {
+ .detect = xlnx_dsi_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = xlnx_dsi_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+ .dpms = xlnx_dsi_connector_dpms,
+};
+
+static int xlnx_dsi_get_modes(struct drm_connector *connector)
+{
+ struct xlnx_dsi *dsi = connector_to_dsi(connector);
+
+ if (dsi->panel)
+ return drm_panel_get_modes(dsi->panel, connector);
+
+ return 0;
+}
+
+static struct drm_encoder *
+xlnx_dsi_best_encoder(struct drm_connector *connector)
+{
+ return &(connector_to_dsi(connector)->encoder);
+}
+
+static const struct drm_connector_helper_funcs
+xlnx_dsi_connector_helper_funcs = {
+ .get_modes = xlnx_dsi_get_modes,
+ .best_encoder = xlnx_dsi_best_encoder,
+};
+
+static int xlnx_dsi_create_connector(struct drm_encoder *encoder)
+{
+ struct xlnx_dsi *dsi = encoder_to_dsi(encoder);
+ struct drm_connector *connector = &dsi->connector;
+ struct drm_device *drm = encoder->dev;
+ int ret;
+
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+ ret = drm_connector_init(encoder->dev, connector,
+ &xlnx_dsi_connector_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ if (ret) {
+ dev_err(dsi->dev, "Failed to create the DRM connector\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(connector, &xlnx_dsi_connector_helper_funcs);
+ drm_connector_register(connector);
+ drm_connector_attach_encoder(connector, encoder);
+
+ return 0;
+}
+
+/**
+ * xlnx_dsi_atomic_mode_set - derive the DSI timing parameters
+ *
+ * @encoder: pointer to Xilinx DRM encoder
+ * @crtc_state: Pointer to drm core crtc state
+ * @connector_state: DSI connector drm state
+ *
+ * This function derives the DSI IP timing parameters from the timing
+ * values given in the attached panel driver.
+ */
+static void
+xlnx_dsi_atomic_mode_set(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *connector_state)
+{
+ struct xlnx_dsi *dsi = encoder_to_dsi(encoder);
+ struct drm_display_mode *m = &crtc_state->adjusted_mode;
+ u32 reg, video_mode;
+
+ reg = xlnx_dsi_readl(dsi->iomem, XDSI_PCR);
+ video_mode = (reg & XDSI_PCR_VIDEOMODE_MASK) >>
+ XDSI_PCR_VIDEOMODE_SHIFT;
+
+ /* configure the HSA value only if non_burst_sync_pluse video mode */
+ if (!video_mode &&
+ (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)) {
+ reg = XDSI_TIME1_HSA(m->hsync_end - m->hsync_start);
+ xlnx_dsi_writel(dsi->iomem, XDSI_TIME1, reg);
+ }
+
+ reg = XDSI_TIME4_VFP(m->vsync_start - m->vdisplay) |
+ XDSI_TIME4_VBP(m->vtotal - m->vsync_end) |
+ XDSI_TIME4_VSA(m->vsync_end - m->vsync_start);
+ xlnx_dsi_writel(dsi->iomem, XDSI_TIME4, reg);
+
+ reg = XDSI_TIME3_HFP(m->hsync_start - m->hdisplay) |
+ XDSI_TIME3_HBP(m->htotal - m->hsync_end);
+ xlnx_dsi_writel(dsi->iomem, XDSI_TIME3, reg);
+ dev_dbg(dsi->dev, "mul factor for parsed datatype is = %d\n",
+ dsi->mul_factor / 100);
+ /*
+ * The HACT parameter received from panel timing values should be
+ * divisible by 4. The reason for this is, the word count given as
+ * input to DSI controller is HACT * mul_factor. The mul_factor is
+ * 3, 2.25, 2.25, 2 respectively for RGB888, RGB666_L, RGB666_P and
+ * RGB565.
+ * e.g. for RGB666_L color format and 1080p, the word count is
+ * 1920*2.25 = 4320 which is divisible by 4 and it is a valid input
+ * to DSI controller. Based on this 2.25 mul factor, we come up with
+ * the division factor of (XDSI_HACT_MULTIPLIER) as 4 for checking
+ */
+ if ((m->hdisplay & XDSI_HACT_MULTIPLIER) != 0)
+ dev_warn(dsi->dev, "hactive received from panel is not aligned\n");
+
+ reg = XDSI_TIME2_HACT(m->hdisplay * dsi->mul_factor / 100) |
+ XDSI_TIME2_VACT(m->vdisplay);
+ xlnx_dsi_writel(dsi->iomem, XDSI_TIME2, reg);
+
+ dev_dbg(dsi->dev, "LCD size = %dx%d\n", m->hdisplay, m->hdisplay);
+}
+
+static void xlnx_dsi_disable(struct drm_encoder *encoder)
+{
+ struct xlnx_dsi *dsi = encoder_to_dsi(encoder);
+ u32 reg = xlnx_dsi_readl(dsi->iomem, XDSI_CCR);
+
+ reg &= ~XDSI_CCR_COREENB;
+ xlnx_dsi_writel(dsi->iomem, XDSI_CCR, reg);
+ dev_dbg(dsi->dev, "DSI Tx is disabled. regs are at default values\n");
+}
+
+static void xlnx_dsi_enable(struct drm_encoder *encoder)
+{
+ struct xlnx_dsi *dsi = encoder_to_dsi(encoder);
+ u32 reg = xlnx_dsi_readl(dsi->iomem, XDSI_CCR);
+
+ reg |= XDSI_CCR_COREENB;
+ xlnx_dsi_writel(dsi->iomem, XDSI_CCR, reg);
+ dev_dbg(dsi->dev, "MIPI DSI Tx controller is enabled\n");
+}
+
+static const struct drm_encoder_helper_funcs
+xlnx_dsi_encoder_helper_funcs = {
+ .atomic_mode_set = xlnx_dsi_atomic_mode_set,
+ .enable = xlnx_dsi_enable,
+ .disable = xlnx_dsi_disable,
+};
+
+static const struct drm_encoder_funcs xlnx_dsi_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static int xlnx_dsi_parse_dt(struct xlnx_dsi *dsi)
+{
+ struct device *dev = dsi->dev;
+ struct device_node *node = dev->of_node;
+ int ret;
+ u32 datatype;
+ static const int xdsi_mul_fact[XDSI_NUM_DATA_T] = {300, 225, 225, 200};
+
+ dsi->dphy_clk_200M = devm_clk_get(dev, "dphy_clk_200M");
+ if (IS_ERR(dsi->dphy_clk_200M)) {
+ ret = PTR_ERR(dsi->dphy_clk_200M);
+ dev_err(dev, "failed to get dphy_clk_200M %d\n", ret);
+ return ret;
+ }
+
+ dsi->video_aclk = devm_clk_get(dev, "s_axis_aclk");
+ if (IS_ERR(dsi->video_aclk)) {
+ ret = PTR_ERR(dsi->video_aclk);
+ dev_err(dev, "failed to get video_clk %d\n", ret);
+ return ret;
+ }
+
+ ret = of_property_read_u32(node, "xlnx,dsi-num-lanes", &dsi->lanes);
+ if (ret < 0) {
+ dev_err(dsi->dev, "missing xlnx,dsi-num-lanes property\n");
+ return ret;
+ }
+ if (dsi->lanes > 4 || dsi->lanes < 1) {
+ dev_err(dsi->dev, "%d lanes : invalid lanes\n", dsi->lanes);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(node, "xlnx,dsi-data-type", &datatype);
+ if (ret < 0) {
+ dev_err(dsi->dev, "missing xlnx,dsi-data-type property\n");
+ return ret;
+ }
+ dsi->format = datatype;
+ if (datatype > MIPI_DSI_FMT_RGB565) {
+ dev_err(dsi->dev, "Invalid xlnx,dsi-data-type string\n");
+ return -EINVAL;
+ }
+
+ /*
+ * multiplication factor used for HACT, based on data type.
+ *
+ * e.g. for RGB666_L datatype and 1920x1080 resolution,
+ * the Hact (WC) would be as follows -
+ * 1920 pixels * 18 bits per pixel / 8 bits per byte
+ * = 1920 pixels * 2.25 bytes per pixel = 4320 bytes.
+ *
+ * Data Type - Multiplication factor
+ * RGB888 - 3
+ * RGB666_L - 2.25
+- * RGB666_P - 2.25
+ * RGB565 - 2
+ *
+ * Since the multiplication factor maybe a floating number,
+ * a 100x multiplication factor is used.
+ */
+ dsi->mul_factor = xdsi_mul_fact[datatype];
+
+ dsi->cmdmode = of_property_read_bool(node, "xlnx,dsi-cmd-mode");
+
+ dev_dbg(dsi->dev, "DSI controller num lanes = %d", dsi->lanes);
+ dev_dbg(dsi->dev, "DSI controller datatype = %d\n", datatype);
+ dev_dbg(dsi->dev, "DSI controller cmd mode = %d\n", dsi->cmdmode);
+
+ return 0;
+}
+
+static int xlnx_dsi_bind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct xlnx_dsi *dsi = dev_get_drvdata(dev);
+ struct drm_encoder *encoder = &dsi->encoder;
+ struct drm_device *drm_dev = data;
+ int ret;
+
+ drm_encoder_init(drm_dev, encoder, &xlnx_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI, NULL);
+ drm_encoder_helper_add(encoder, &xlnx_dsi_encoder_helper_funcs);
+
+ encoder->possible_crtcs = 1;
+
+ ret = xlnx_dsi_create_connector(encoder);
+ if (ret) {
+ dev_err(dsi->dev, "fail creating connector, ret = %d\n", ret);
+ drm_encoder_cleanup(encoder);
+ return ret;
+ }
+
+ ret = mipi_dsi_host_register(&dsi->dsi_host);
+ if (ret) {
+ dev_err(dsi->dev, "failed to register DSI host: %d\n", ret);
+ xlnx_dsi_connector_destroy(&dsi->connector);
+ drm_encoder_cleanup(encoder);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void xlnx_dsi_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct xlnx_dsi *dsi = dev_get_drvdata(dev);
+
+ xlnx_dsi_disable(&dsi->encoder);
+ mipi_dsi_host_unregister(&dsi->dsi_host);
+}
+
+static const struct component_ops xlnx_dsi_component_ops = {
+ .bind = xlnx_dsi_bind,
+ .unbind = xlnx_dsi_unbind,
+};
+
+static int xlnx_dsi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct xlnx_dsi *dsi;
+ int ret;
+ unsigned long rate;
+
+ dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+ if (!dsi)
+ return -ENOMEM;
+
+ dsi->dsi_host.ops = &xlnx_dsi_ops;
+ dsi->dsi_host.dev = dev;
+ dsi->dev = dev;
+
+ ret = xlnx_dsi_parse_dt(dsi);
+ if (ret)
+ return ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dsi->iomem = devm_ioremap_resource(dev, res);
+ if (IS_ERR(dsi->iomem)) {
+ dev_err(dev, "failed to remap io region\n");
+ return PTR_ERR(dsi->iomem);
+ }
+ platform_set_drvdata(pdev, dsi);
+
+ ret = clk_set_rate(dsi->dphy_clk_200M, XDSI_DPHY_CLK_REQ);
+ if (ret) {
+ dev_err(dev, "failed to set dphy clk rate %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dsi->dphy_clk_200M);
+ if (ret) {
+ dev_err(dev, "failed to enable dphy clk %d\n", ret);
+ return ret;
+ }
+
+ rate = clk_get_rate(dsi->dphy_clk_200M);
+ /* Based on clock source, little deviation is acceptable */
+ if (rate < XDSI_DPHY_CLK_MIN && rate > XDSI_DPHY_CLK_MAX) {
+ dev_err(dev, "Error DPHY clock = %lu\n", rate);
+ ret = -EINVAL;
+ goto err_disable_dphy_clk;
+ }
+
+ ret = clk_prepare_enable(dsi->video_aclk);
+ if (ret) {
+ dev_err(dev, "failed to enable video clk %d\n", ret);
+ goto err_disable_dphy_clk;
+ }
+
+ ret = component_add(dev, &xlnx_dsi_component_ops);
+ if (ret)
+ goto err_disable_video_clk;
+
+ return 0;
+
+err_disable_video_clk:
+ clk_disable_unprepare(dsi->video_aclk);
+err_disable_dphy_clk:
+ clk_disable_unprepare(dsi->dphy_clk_200M);
+
+ return ret;
+}
+
+static int xlnx_dsi_remove(struct platform_device *pdev)
+{
+ struct xlnx_dsi *dsi = platform_get_drvdata(pdev);
+
+ component_del(&pdev->dev, &xlnx_dsi_component_ops);
+ clk_disable_unprepare(dsi->video_aclk);
+ clk_disable_unprepare(dsi->dphy_clk_200M);
+
+ return 0;
+}
+
+static const struct of_device_id xlnx_dsi_of_match[] = {
+ { .compatible = "xlnx-dsi-1.0", },
+ { /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, xlnx_dsi_of_match);
+
+static struct platform_driver dsi_driver = {
+ .probe = xlnx_dsi_probe,
+ .remove = xlnx_dsi_remove,
+ .driver = {
+ .name = "xlnx-dsi",
+ .of_match_table = xlnx_dsi_of_match,
+ },
+};
+
+module_platform_driver(dsi_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Xilinx Programmable MIPI DSI TX Driver");
+MODULE_LICENSE("GPL v2");
--
1.8.3.1
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