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Message-ID: <1418200648-32656-10-git-send-email-Ying.Liu@freescale.com>
Date: Wed, 10 Dec 2014 16:37:22 +0800
From: Liu Ying <Ying.Liu@...escale.com>
To: <dri-devel@...ts.freedesktop.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <p.zabel@...gutronix.de>,
<thierry.reding@...il.com>, <shawn.guo@...aro.org>,
<kernel@...gutronix.de>, <linux@....linux.org.uk>,
<mturquette@...aro.org>, <airlied@...ux.ie>
Subject: [PATCH RFC 09/15] drm: imx: Add MIPI DSI host controller driver
This patch adds i.MX MIPI DSI host controller driver support.
Currently, the driver supports the burst with sync pulses mode only.
Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
---
.../devicetree/bindings/drm/imx/mipi_dsi.txt | 81 ++
drivers/gpu/drm/imx/Kconfig | 6 +
drivers/gpu/drm/imx/Makefile | 1 +
drivers/gpu/drm/imx/imx-mipi-dsi.c | 1017 ++++++++++++++++++++
4 files changed, 1105 insertions(+)
create mode 100644 Documentation/devicetree/bindings/drm/imx/mipi_dsi.txt
create mode 100644 drivers/gpu/drm/imx/imx-mipi-dsi.c
diff --git a/Documentation/devicetree/bindings/drm/imx/mipi_dsi.txt b/Documentation/devicetree/bindings/drm/imx/mipi_dsi.txt
new file mode 100644
index 0000000..3d07fd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/imx/mipi_dsi.txt
@@ -0,0 +1,81 @@
+Device-Tree bindings for MIPI DSI host controller
+
+MIPI DSI host controller
+========================
+
+The MIPI DSI host controller is a Synopsys DesignWare IP.
+It is a digital core that implements all protocol functions defined
+in the MIPI DSI specification, providing an interface between the
+system and the MIPI DPHY, and allowing communication with a MIPI DSI
+compliant display.
+
+Required properties:
+ - #address-cells : Should be <1>.
+ - #size-cells : Should be <0>.
+ - compatible : Should be "fsl,imx6q-mipi-dsi" for i.MX6q/sdl SoCs.
+ - reg : Physical base address of the controller and length of memory
+ mapped region.
+ - interrupts : The controller's interrupt number to the CPU(s).
+ - gpr : Should be <&gpr>.
+ The phandle points to the iomuxc-gpr region containing the
+ multiplexer control register for the controller.
+ - clocks, clock-names : Phandles to the controller pllref, pllref_gate
+ and core_cfg clocks, as described in [1] and [2].
+ - panel@0 : A panel node which contains a display-timings child node as
+ defined in [3].
+ - port@[0-4] : Up to four port nodes with endpoint definitions as defined
+ in [4], corresponding to the four inputs to the controller multiplexer.
+ Note that each port node should contain the input-port property to
+ distinguish it from the panel node, as described in [5].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/clock/imx6q-clock.txt
+[3] Documentation/devicetree/bindings/video/display-timing.txt
+[4] Documentation/devicetree/bindings/media/video-interfaces.txt
+[5] Documentation/devicetree/bindings/mipi/dsi/mipi-dsi-bus.txt
+
+example:
+ gpr: iomuxc-gpr@...e0000 {
+ /* ... */
+ };
+
+ mipi_dsi: mipi@...e0000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "fsl,imx6q-mipi-dsi";
+ reg = <0x021e0000 0x4000>;
+ interrupts = <0 102 IRQ_TYPE_LEVEL_HIGH>;
+ gpr = <&gpr>;
+ clocks = <&clks IMX6QDL_CLK_VIDEO_27M>,
+ <&clks IMX6QDL_CLK_HSI_TX>,
+ <&clks IMX6QDL_CLK_HSI_TX>;
+ clock-names = "pllref", "pllref_gate", "core_cfg";
+
+ port@0 {
+ reg = <0>;
+ input-port;
+
+ mipi_mux_0: endpoint {
+ remote-endpoint = <&ipu1_di0_mipi>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ input-port;
+
+ mipi_mux_1: endpoint {
+ remote-endpoint = <&ipu1_di1_mipi>;
+ };
+ };
+
+ panel@0 {
+ compatible = "himax,hx8369a-dsi";
+ reg = <0>;
+ /* ... */
+
+ display-timings {
+ /* ... */
+ };
+ };
+ };
diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index 82fb758..03f04fb 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -51,3 +51,9 @@ config DRM_IMX_HDMI
depends on DRM_IMX
help
Choose this if you want to use HDMI on i.MX6.
+
+config DRM_IMX_MIPI_DSI
+ tristate "Freescale i.MX DRM MIPI DSI"
+ depends on DRM_IMX && MFD_SYSCON
+ 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 582c438..4571d52 100644
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
imx-ipuv3-crtc-objs := ipuv3-crtc.o ipuv3-plane.o
obj-$(CONFIG_DRM_IMX_IPUV3) += imx-ipuv3-crtc.o
obj-$(CONFIG_DRM_IMX_HDMI) += imx-hdmi.o
+obj-$(CONFIG_DRM_IMX_MIPI_DSI) += imx-mipi-dsi.o
diff --git a/drivers/gpu/drm/imx/imx-mipi-dsi.c b/drivers/gpu/drm/imx/imx-mipi-dsi.c
new file mode 100644
index 0000000..c8ebeca
--- /dev/null
+++ b/drivers/gpu/drm/imx/imx-mipi-dsi.c
@@ -0,0 +1,1017 @@
+/*
+ * i.MX drm driver - MIPI DSI Host Controller
+ *
+ * Copyright (C) 2011-2014 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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_address.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+#include <asm/div64.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include "imx-drm.h"
+
+#define DRIVER_NAME "imx-mipi-dsi"
+
+#define DSI_VERSION 0x00
+
+#define DSI_PWR_UP 0x04
+#define RESET 0
+#define POWERUP BIT(0)
+
+#define DSI_CLKMGR_CFG 0x08
+#define TO_CLK_DIVIDSION(div) (((div) & 0xff) << 8)
+#define TX_ESC_CLK_DIVIDSION(div) (((div) & 0xff) << 0)
+
+#define DSI_DPI_CFG 0x0c
+#define EN18_LOOSELY BIT(10)
+#define COLORM_ACTIVE_LOW BIT(9)
+#define SHUTD_ACTIVE_LOW BIT(8)
+#define HSYNC_ACTIVE_LOW BIT(7)
+#define VSYNC_ACTIVE_LOW BIT(6)
+#define DATAEN_ACTIVE_LOW BIT(5)
+#define DPI_COLOR_CODING_16BIT_1 (0x0 << 2)
+#define DPI_COLOR_CODING_16BIT_2 (0x1 << 2)
+#define DPI_COLOR_CODING_16BIT_3 (0x2 << 2)
+#define DPI_COLOR_CODING_18BIT_1 (0x3 << 2)
+#define DPI_COLOR_CODING_18BIT_2 (0x4 << 2)
+#define DPI_COLOR_CODING_24BIT (0x5 << 2)
+#define DPI_VID(vid) (((vid) & 0x3) << 0)
+
+#define DSI_DBI_CFG 0x10
+#define DSI_DBIS_CMDSIZE 0x14
+
+#define DSI_PCKHDL_CFG 0x18
+#define GEN_VID_RX(vid) (((vid) & 0x3) << 5)
+#define EN_CRC_RX BIT(4)
+#define EN_ECC_RX BIT(3)
+#define EN_BTA BIT(2)
+#define EN_EOTN_RX BIT(1)
+#define EN_EOTP_TX BIT(0)
+
+#define DSI_VID_MODE_CFG 0x1c
+#define FRAME_BTA_ACK BIT(11)
+#define EN_NULL_PKT BIT(10)
+#define EN_NULL_PKT_MASK BIT(10)
+#define EN_MULTI_PKT BIT(9)
+#define ENABLE_LOW_POWER (0x3f << 3)
+#define ENABLE_LOW_POWER_MASK (0x3f << 3)
+#define VID_MODE_TYPE_NONBURST_SYNC_PULSES (0x0 << 1)
+#define VID_MODE_TYPE_NONBURST_SYNC_EVENTS (0x1 << 1)
+#define VID_MODE_TYPE_BURST_SYNC_PULSES (0x3 << 1)
+#define VID_MODE_TYPE_MASK (0x3 << 1)
+#define ENABLE_VIDEO_MODE BIT(0)
+#define DISABLE_VIDEO_MODE 0
+#define ENABLE_VIDEO_MODE_MASK BIT(0)
+
+#define DSI_VID_PKT_CFG 0x20
+#define NULL_PKT_SIZE(b) (((b) & 0x3f) << 21)
+#define NUM_CHUNKS(n) (((n) & 0x3f) << 11)
+#define VID_PKT_SIZE(p) (((p) & 0x7ff) << 0)
+#define VID_PKT_MAX_SIZE 0x7ff
+
+#define DSI_CMD_MODE_CFG 0x24
+#define EN_TEAR_FX BIT(14)
+#define EN_ACK_RQST BIT(13)
+#define DCS_LW_TX_LP BIT(12)
+#define GEN_LW_TX_LP BIT(11)
+#define MAX_RD_PKT_SIZE_LP BIT(10)
+#define DCS_SW_2P_TX_LP BIT(9)
+#define DCS_SW_1P_TX_LP BIT(8)
+#define DCS_SW_0P_TX_LP BIT(7)
+#define GEN_SR_2P_TX_LP BIT(6)
+#define GEN_SR_1P_TX_LP BIT(5)
+#define GEN_SR_0P_TX_LP BIT(4)
+#define GEN_SW_2P_TX_LP BIT(3)
+#define GEN_SW_1P_TX_LP BIT(2)
+#define GEN_SW_0P_TX_LP BIT(1)
+#define ENABLE_CMD_MODE BIT(0)
+#define DISABLE_CMD_MODE 0
+#define ENABLE_CMD_MODE_MASK BIT(0)
+#define CMD_MODE_ALL_LP (DCS_LW_TX_LP | \
+ GEN_LW_TX_LP | \
+ MAX_RD_PKT_SIZE_LP | \
+ DCS_SW_2P_TX_LP | \
+ DCS_SW_1P_TX_LP | \
+ DCS_SW_0P_TX_LP | \
+ GEN_SR_2P_TX_LP | \
+ GEN_SR_1P_TX_LP | \
+ GEN_SR_0P_TX_LP | \
+ GEN_SW_2P_TX_LP | \
+ GEN_SW_1P_TX_LP | \
+ GEN_SW_0P_TX_LP)
+
+#define DSI_TMR_LINE_CFG 0x28
+#define HLINE_TIME(lbcc) (((lbcc) & 0x3fff) << 18)
+#define HBP_TIME(lbcc) (((lbcc) & 0x1ff) << 9)
+#define HSA_TIME(lbcc) (((lbcc) & 0x1ff) << 0)
+
+#define DSI_VTIMING_CFG 0x2c
+#define V_ACTIVE_LINES(line) (((line) & 0x7ff) << 16)
+#define VFP_LINES(line) (((line) & 0x3f) << 10)
+#define VBP_LINES(line) (((line) & 0x3f) << 4)
+#define VSA_LINES(line) (((line) & 0xf) << 0)
+
+#define DSI_PHY_TMR_CFG 0x30
+#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 20)
+#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 12)
+#define BTA_TIME(lbcc) (((lbcc) & 0xfff) << 0)
+
+#define DSI_GEN_HDR 0x34
+#define GEN_HDATA(data) (((data) & 0xffff) << 8)
+#define GEN_HDATA_MASK (0xffff << 8)
+#define GEN_HTYPE(type) (((type) & 0xff) << 0)
+#define GEN_HTYPE_MASK 0xff
+
+#define DSI_GEN_PLD_DATA 0x38
+
+#define DSI_CMD_PKT_STATUS 0x3c
+#define GEN_CMD_EMPTY BIT(0)
+#define GEN_CMD_FULL BIT(1)
+#define GEN_PLD_W_EMPTY BIT(2)
+#define GEN_PLD_W_FULL BIT(3)
+#define GEN_PLD_R_EMPTY BIT(4)
+#define GEN_RD_CMD_BUSY BIT(6)
+
+#define DSI_TO_CNT_CFG 0x40
+#define DSI_ERROR_ST0 0x44
+#define DSI_ERROR_ST1 0x48
+#define DSI_ERROR_MSK0 0x4c
+#define DSI_ERROR_MSK1 0x50
+
+#define DSI_PHY_RSTZ 0x54
+#define PHY_DISABLECLK 0
+#define PHY_ENABLECLK BIT(2)
+#define PHY_RSTZ 0
+#define PHY_UNRSTZ BIT(1)
+#define PHY_SHUTDOWNZ 0
+#define PHY_UNSHUTDOWNZ BIT(0)
+
+#define DSI_PHY_IF_CFG 0x58
+#define N_LANES(n) ((((n) - 1) & 0x3) << 0)
+#define PHY_STOP_WAIT_TIME(cycle) (((cycle) & 0x3ff) << 2)
+
+#define DSI_PHY_IF_CTRL 0x5c
+#define PHY_IF_CTRL_RESET 0x0
+#define TX_REQ_CLK_HS BIT(0)
+
+#define DSI_PHY_STATUS 0x60
+#define LOCK BIT(0)
+#define STOP_STATE_CLK_LANE BIT(2)
+
+#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)
+
+#define IMX_MIPI_DSI_MAX_DATA_LANES 2
+
+#define PHY_STATUS_TIMEOUT 10
+#define CMD_PKT_STATUS_TIMEOUT 20
+
+#define IMX_MIPI_DSI_PLD_DATA_BUF_SIZE 4
+
+#define MHZ 1000000
+
+#define host_to_dsi(host) container_of(host, struct imx_mipi_dsi, dsi_host)
+#define con_to_dsi(x) container_of(x, struct imx_mipi_dsi, connector)
+#define enc_to_dsi(x) container_of(x, struct imx_mipi_dsi, encoder)
+
+struct imx_mipi_dsi {
+ struct mipi_dsi_host dsi_host;
+ struct drm_connector connector;
+ struct drm_encoder encoder;
+ struct device_node *panel_node;
+ struct drm_panel *panel;
+ struct device *dev;
+
+ struct regmap *regmap;
+ void __iomem *base;
+
+ struct clk *pllref_clk;
+ struct clk *pllref_gate_clk;
+ struct clk *cfg_clk;
+
+ unsigned int lane_mbps; /* per lane */
+ u32 channel;
+ u32 lanes;
+ u32 format;
+ struct videomode vm;
+
+ bool enabled;
+};
+
+enum {
+ STATUS_TO_CLEAR,
+ STATUS_TO_SET,
+};
+
+struct dphy_pll_testdin_map {
+ 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 int max_mbps_to_testdin(unsigned int max_mbps)
+{
+ 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 void imx_mipi_dsi_set_ipu_di_mux(struct imx_mipi_dsi *dsi, int ipu_di)
+{
+ regmap_update_bits(dsi->regmap, IOMUXC_GPR3,
+ IMX6Q_GPR3_MIPI_MUX_CTL_MASK,
+ ipu_di << IMX6Q_GPR3_MIPI_MUX_CTL_SHIFT);
+}
+
+static inline void dsi_write(struct imx_mipi_dsi *dsi, u32 reg, u32 val)
+{
+ writel(val, dsi->base + reg);
+}
+
+static inline u32 dsi_read(struct imx_mipi_dsi *dsi, u32 reg)
+{
+ return readl(dsi->base + reg);
+}
+
+static inline void dsi_modify(struct imx_mipi_dsi *dsi, u32 reg,
+ u32 mask, u32 val)
+{
+ u32 v = readl(dsi->base + reg);
+ v &= ~mask;
+ v |= val;
+ writel(v, dsi->base + reg);
+}
+
+static int format_to_bpp(struct imx_mipi_dsi *dsi)
+{
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ case MIPI_DSI_FMT_RGB666:
+ return 24;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ return 18;
+ case MIPI_DSI_FMT_RGB565:
+ return 16;
+ default:
+ dev_err(dsi->dev, "unsupported pixel format\n");
+ return -EINVAL;
+ }
+}
+
+static int check_status(struct imx_mipi_dsi *dsi, u32 reg, u32 status,
+ int timeout, bool to_set)
+{
+ u32 val;
+ bool out = false;
+
+ val = dsi_read(dsi, reg);
+ for (;;) {
+ out = to_set ? (val & status) : !(val & status);
+ if (out)
+ break;
+
+ if (!timeout--)
+ return -EFAULT;
+
+ msleep(1);
+ val = dsi_read(dsi, reg);
+ }
+ return 0;
+}
+
+static int imx_mipi_dsi_config_testdin(struct imx_mipi_dsi *dsi)
+{
+ int ret = 0;
+ int testdin;
+
+ testdin = max_mbps_to_testdin(dsi->lane_mbps);
+ if (testdin < 0) {
+ dev_err(dsi->dev, "failed to get testdin for %dmbps "
+ "lane clock\n", dsi->lane_mbps);
+ return testdin;
+ }
+
+ clk_prepare_enable(dsi->pllref_clk);
+ clk_prepare_enable(dsi->pllref_gate_clk);
+ 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);
+ dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENABLECLK | PHY_UNRSTZ |
+ PHY_UNSHUTDOWNZ);
+ ret = check_status(dsi, DSI_PHY_STATUS, LOCK,
+ PHY_STATUS_TIMEOUT, STATUS_TO_SET);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to wait for phy lock state\n");
+ return ret;
+ }
+ ret = check_status(dsi, DSI_PHY_STATUS, STOP_STATE_CLK_LANE,
+ PHY_STATUS_TIMEOUT, STATUS_TO_SET);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to wait for phy clk lane stop state\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int imx_mipi_dsi_get_lane_bps(struct imx_mipi_dsi *dsi,
+ unsigned int *final_mbps)
+{
+ int target_mbps, mpclk, bpp, i;
+ unsigned long pllref;
+
+ bpp = format_to_bpp(dsi);
+ if (bpp < 0)
+ return bpp;
+
+ pllref = clk_get_rate(dsi->pllref_clk);
+ if (pllref != 27000000)
+ dev_warn(dsi->dev, "expect 27MHz DPHY pll reference clock\n");
+
+ mpclk = DIV_ROUND_UP(dsi->vm.pixelclock, MHZ);
+ if (mpclk) {
+ /* take 1/0.7 blanking overhead into consideration */
+ target_mbps = (mpclk * (bpp / dsi->lanes) * 10) / 7;
+ } else {
+ dev_dbg(dsi->dev, "use default 1Gbps DPHY pll clock\n");
+ target_mbps = 1000;
+ }
+
+ dev_dbg(dsi->dev, "target DPHY pll clock frequency is %dMbps\n",
+ target_mbps);
+
+ for (i = 0; i < ARRAY_SIZE(dptdin_map); i++) {
+ if (target_mbps < dptdin_map[i].max_mbps) {
+ *final_mbps = dptdin_map[i].max_mbps;
+ dev_info(dsi->dev, "real DPHY pll clock frequency "
+ "is %dMbps\n", *final_mbps);
+ return 0;
+ }
+ }
+
+ dev_err(dsi->dev, "DPHY clock frequency %dMbps is out of range\n",
+ target_mbps);
+
+ return -EINVAL;
+}
+
+static int imx_mipi_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct imx_mipi_dsi *dsi = host_to_dsi(host);
+ int ret;
+
+ if (device->lanes > IMX_MIPI_DSI_MAX_DATA_LANES) {
+ dev_err(dsi->dev, "the number of data lanes(%d) is too many\n",
+ device->lanes);
+ return -EINVAL;
+ }
+
+ if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) ||
+ !(device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)) {
+ dev_err(dsi->dev, "device mode is unsupported\n");
+ return -EINVAL;
+ }
+
+ dsi->lanes = device->lanes;
+ dsi->channel = device->channel;
+ dsi->format = device->format;
+ dsi->panel_node = device->dev.of_node;
+ of_get_videomode(dsi->panel_node, &dsi->vm, 0);
+
+ ret = imx_mipi_dsi_get_lane_bps(dsi, &dsi->lane_mbps);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int imx_mipi_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct imx_mipi_dsi *dsi = host_to_dsi(host);
+
+ dsi->panel_node = NULL;
+ dsi->panel = NULL;
+
+ return 0;
+}
+
+static int imx_mipi_dsi_gen_pkt_hdr_write(struct imx_mipi_dsi *dsi, u32 val)
+{
+ int ret;
+
+ ret = check_status(dsi, DSI_CMD_PKT_STATUS, GEN_CMD_FULL,
+ CMD_PKT_STATUS_TIMEOUT, STATUS_TO_CLEAR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to get avaliable command FIFO\n");
+ return ret;
+ }
+
+ dsi_write(dsi, DSI_GEN_HDR, val);
+
+ ret = check_status(dsi, DSI_CMD_PKT_STATUS,
+ GEN_CMD_EMPTY | GEN_PLD_W_EMPTY,
+ CMD_PKT_STATUS_TIMEOUT, STATUS_TO_SET);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to write command FIFO\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int imx_mipi_dsi_dcs_short_write(struct imx_mipi_dsi *dsi,
+ const struct mipi_dsi_msg *msg)
+{
+ const u16 *tx_buf = msg->tx_buf;
+ u32 val = GEN_HDATA(*tx_buf) | GEN_HTYPE(msg->type);
+
+ if (msg->tx_len > 2) {
+ dev_err(dsi->dev, "too long tx buf length %d for short write\n",
+ msg->tx_len);
+ return -EINVAL;
+ }
+
+ return imx_mipi_dsi_gen_pkt_hdr_write(dsi, val);
+}
+
+static int imx_mipi_dsi_dcs_long_write(struct imx_mipi_dsi *dsi,
+ const struct mipi_dsi_msg *msg)
+{
+ const u32 *tx_buf = msg->tx_buf;
+ int len = msg->tx_len, ret;
+ u32 val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
+
+ if (msg->tx_len < 3) {
+ dev_err(dsi->dev, "wrong tx buf length %d for long write\n",
+ msg->tx_len);
+ return -EINVAL;
+ }
+
+ /* write the bulks */
+ while (len / IMX_MIPI_DSI_PLD_DATA_BUF_SIZE) {
+ dsi_write(dsi, DSI_GEN_PLD_DATA, *tx_buf);
+ tx_buf++;
+ len -= IMX_MIPI_DSI_PLD_DATA_BUF_SIZE;
+ ret = check_status(dsi, DSI_CMD_PKT_STATUS, GEN_PLD_W_FULL,
+ CMD_PKT_STATUS_TIMEOUT, STATUS_TO_CLEAR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to get avaliable "
+ "write payload FIFO\n");
+ return ret;
+ }
+ }
+
+ /* write the remainder */
+ if (len > 0) {
+ ret = check_status(dsi, DSI_CMD_PKT_STATUS, GEN_PLD_W_FULL,
+ CMD_PKT_STATUS_TIMEOUT, STATUS_TO_CLEAR);
+ if (ret < 0) {
+ dev_err(dsi->dev, "failed to get avaliable "
+ "write payload FIFO\n");
+ return ret;
+ }
+ dsi_write(dsi, DSI_GEN_PLD_DATA, *tx_buf);
+ }
+
+ return imx_mipi_dsi_gen_pkt_hdr_write(dsi, val);
+}
+
+static ssize_t imx_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct imx_mipi_dsi *dsi = host_to_dsi(host);
+ int ret;
+
+ switch (msg->type) {
+ case MIPI_DSI_DCS_SHORT_WRITE:
+ case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
+ case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
+ ret = imx_mipi_dsi_dcs_short_write(dsi, msg);
+ break;
+ case MIPI_DSI_DCS_LONG_WRITE:
+ ret = imx_mipi_dsi_dcs_long_write(dsi, msg);
+ break;
+ default:
+ dev_err(dsi->dev, "unsupported message type\n");
+ ret = -EFAULT;
+ }
+
+ return ret;
+}
+
+static const struct mipi_dsi_host_ops imx_mipi_dsi_host_ops = {
+ .attach = imx_mipi_dsi_host_attach,
+ .detach = imx_mipi_dsi_host_detach,
+ .transfer = imx_mipi_dsi_host_transfer,
+};
+
+static enum drm_connector_status
+imx_mipi_dsi_detect(struct drm_connector *connector, bool force)
+{
+ struct imx_mipi_dsi *dsi = con_to_dsi(connector);
+
+ if (!dsi->panel) {
+ dsi->panel = of_drm_find_panel(dsi->panel_node);
+ if (dsi->panel)
+ drm_panel_attach(dsi->panel, &dsi->connector);
+ }
+
+ if (dsi->panel)
+ return connector_status_connected;
+
+ return connector_status_disconnected;
+
+}
+
+static struct drm_connector_funcs imx_mipi_dsi_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = imx_mipi_dsi_detect,
+ .destroy = imx_drm_connector_destroy,
+};
+
+static int imx_mipi_dsi_connector_get_modes(struct drm_connector *connector)
+{
+ struct imx_mipi_dsi *dsi = con_to_dsi(connector);
+
+ return drm_panel_get_modes(dsi->panel);
+}
+
+static struct drm_encoder *imx_mipi_dsi_connector_best_encoder(
+ struct drm_connector *connector)
+{
+ struct imx_mipi_dsi *dsi = con_to_dsi(connector);
+
+ return &dsi->encoder;
+}
+
+static struct drm_connector_helper_funcs imx_mipi_dsi_connector_helper_funcs = {
+ .get_modes = imx_mipi_dsi_connector_get_modes,
+ .best_encoder = imx_mipi_dsi_connector_best_encoder,
+};
+
+static struct drm_encoder_funcs imx_mipi_dsi_encoder_funcs = {
+ .destroy = imx_drm_encoder_destroy,
+};
+
+static void imx_mipi_dsi_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+}
+
+static bool imx_mipi_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void imx_mipi_dsi_encoder_prepare(struct drm_encoder *encoder)
+{
+ struct imx_mipi_dsi *dsi = enc_to_dsi(encoder);
+ u32 interface_pix_fmt;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ interface_pix_fmt = V4L2_PIX_FMT_RGB24;
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ interface_pix_fmt = V4L2_PIX_FMT_RGB565;
+ break;
+ default:
+ dev_err(dsi->dev, "unsupported DSI pixel format\n");
+ return;
+ }
+
+ imx_drm_panel_format(encoder, interface_pix_fmt);
+}
+
+static void imx_mipi_dsi_init(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PWR_UP, RESET);
+ dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISABLECLK | PHY_RSTZ | PHY_SHUTDOWNZ);
+ dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(1) | TX_ESC_CLK_DIVIDSION(7));
+}
+
+static void imx_mipi_dsi_dpi_config(struct imx_mipi_dsi *dsi,
+ struct drm_display_mode *mode)
+{
+ u32 val = 0;
+
+ if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+ val |= VSYNC_ACTIVE_LOW;
+ if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+ val |= HSYNC_ACTIVE_LOW;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ val |= DPI_COLOR_CODING_24BIT;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ val |= DPI_COLOR_CODING_18BIT_2;
+ val |= EN18_LOOSELY;
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ val |= DPI_COLOR_CODING_18BIT_1;
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ val |= DPI_COLOR_CODING_16BIT_1;
+ break;
+ }
+
+ val |= DPI_VID(dsi->channel);
+
+ dsi_write(dsi, DSI_DPI_CFG, val);
+}
+
+static void imx_mipi_dsi_packet_handler_config(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
+}
+
+static void imx_mipi_dsi_video_mode_config(struct imx_mipi_dsi *dsi)
+{
+ u32 val;
+
+ val = VID_MODE_TYPE_BURST_SYNC_PULSES | ENABLE_LOW_POWER;
+
+ dsi_write(dsi, DSI_VID_MODE_CFG, val);
+}
+
+static void imx_mipi_dsi_video_packet_config(struct imx_mipi_dsi *dsi,
+ struct drm_display_mode *mode)
+{
+ dsi_write(dsi, DSI_VID_PKT_CFG, VID_PKT_SIZE(mode->hdisplay));
+}
+
+static void imx_mipi_dsi_command_mode_config(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_CMD_MODE_CFG, CMD_MODE_ALL_LP | ENABLE_CMD_MODE);
+}
+
+/* Get lane byte clock cycles. */
+static u64 imx_mipi_dsi_get_hcomponent_lbcc(struct imx_mipi_dsi *dsi,
+ u64 hcomponent)
+{
+ u64 frac, lbcc;
+
+ lbcc = hcomponent * dsi->lane_mbps * MHZ / 8;
+ frac = do_div(lbcc, dsi->vm.pixelclock);
+ if (frac)
+ lbcc++;
+
+ return lbcc;
+}
+
+static void imx_mipi_dsi_line_timer_config(struct imx_mipi_dsi *dsi)
+{
+ u32 val = 0, htotal, hsa, hbp, lbcc;
+
+ htotal = dsi->vm.hactive + dsi->vm.hfront_porch +
+ dsi->vm.hback_porch + dsi->vm.hsync_len;
+ hsa = dsi->vm.hsync_len;
+ hbp = dsi->vm.hback_porch;
+
+ lbcc = imx_mipi_dsi_get_hcomponent_lbcc(dsi, htotal);
+ val |= HLINE_TIME(lbcc);
+
+ lbcc = imx_mipi_dsi_get_hcomponent_lbcc(dsi, hsa);
+ val |= HSA_TIME(lbcc);
+
+ lbcc = imx_mipi_dsi_get_hcomponent_lbcc(dsi, hbp);
+ val |= HBP_TIME(lbcc);
+
+ dsi_write(dsi, DSI_TMR_LINE_CFG, val);
+}
+
+static void imx_mipi_dsi_vertical_timing_config(struct imx_mipi_dsi *dsi)
+{
+ u32 val;
+
+ val = V_ACTIVE_LINES(dsi->vm.vactive) | VSA_LINES(dsi->vm.vsync_len) |
+ VFP_LINES(dsi->vm.vfront_porch) | VBP_LINES(dsi->vm.vback_porch);
+
+ dsi_write(dsi, DSI_VTIMING_CFG, val);
+}
+
+static void imx_mipi_dsi_dphy_timing_config(struct imx_mipi_dsi *dsi)
+{
+ u32 val;
+
+ val = PHY_HS2LP_TIME(0x40) | PHY_LP2HS_TIME(0x40) |
+ BTA_TIME(0xd00);
+
+ dsi_write(dsi, DSI_PHY_TMR_CFG, val);
+}
+
+static void imx_mipi_dsi_dphy_interface_config(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) |
+ N_LANES(dsi->lanes));
+}
+
+static void imx_mipi_dsi_clear_err(struct imx_mipi_dsi *dsi)
+{
+ dsi_read(dsi, DSI_ERROR_ST0);
+ dsi_read(dsi, DSI_ERROR_ST1);
+ dsi_write(dsi, DSI_ERROR_MSK0, 0);
+ dsi_write(dsi, DSI_ERROR_MSK1, 0);
+}
+
+static void imx_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct imx_mipi_dsi *dsi = enc_to_dsi(encoder);
+
+ clk_prepare_enable(dsi->cfg_clk);
+ imx_mipi_dsi_init(dsi);
+ imx_mipi_dsi_dpi_config(dsi, mode);
+ imx_mipi_dsi_packet_handler_config(dsi);
+ imx_mipi_dsi_video_mode_config(dsi);
+ imx_mipi_dsi_video_packet_config(dsi, mode);
+ imx_mipi_dsi_command_mode_config(dsi);
+ imx_mipi_dsi_line_timer_config(dsi);
+ imx_mipi_dsi_vertical_timing_config(dsi);
+ imx_mipi_dsi_dphy_timing_config(dsi);
+ imx_mipi_dsi_dphy_interface_config(dsi);
+ imx_mipi_dsi_clear_err(dsi);
+ imx_mipi_dsi_config_testdin(dsi);
+ drm_panel_prepare(dsi->panel);
+ clk_disable_unprepare(dsi->cfg_clk);
+}
+
+static void imx_mipi_dsi_disable_command_mode(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PWR_UP, RESET);
+ dsi_modify(dsi, DSI_CMD_MODE_CFG,
+ ENABLE_CMD_MODE_MASK, DISABLE_CMD_MODE);
+}
+
+static void imx_mipi_dsi_enable_video_mode(struct imx_mipi_dsi *dsi)
+{
+ imx_mipi_dsi_video_mode_config(dsi);
+
+ dsi_modify(dsi, DSI_VID_MODE_CFG,
+ ENABLE_VIDEO_MODE_MASK, ENABLE_VIDEO_MODE);
+ dsi_write(dsi, DSI_PWR_UP, POWERUP);
+ dsi_write(dsi, DSI_PHY_IF_CTRL, TX_REQ_CLK_HS);
+}
+
+static void imx_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
+{
+ struct imx_mipi_dsi *dsi = enc_to_dsi(encoder);
+ int mux = imx_drm_encoder_get_mux_id(dsi->dev->of_node, encoder);
+
+ if (dsi->enabled)
+ return;
+
+ imx_mipi_dsi_set_ipu_di_mux(dsi, mux);
+
+ drm_panel_enable(dsi->panel);
+
+ imx_mipi_dsi_disable_command_mode(dsi);
+ imx_mipi_dsi_enable_video_mode(dsi);
+
+ dsi->enabled = true;
+}
+
+static void imx_mipi_dsi_enable_command_mode(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PWR_UP, RESET);
+ dsi_modify(dsi, DSI_CMD_MODE_CFG,
+ ENABLE_CMD_MODE_MASK, ENABLE_CMD_MODE);
+}
+
+static void imx_mipi_dsi_disable_video_mode(struct imx_mipi_dsi *dsi)
+{
+ dsi_modify(dsi, DSI_VID_MODE_CFG,
+ ENABLE_VIDEO_MODE_MASK, DISABLE_VIDEO_MODE);
+ dsi_write(dsi, DSI_PWR_UP, POWERUP);
+}
+
+static void imx_mipi_dsi_disable(struct imx_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PHY_IF_CTRL, PHY_IF_CTRL_RESET);
+ dsi_write(dsi, DSI_PWR_UP, RESET);
+ dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
+}
+
+static void imx_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+ struct imx_mipi_dsi *dsi = enc_to_dsi(encoder);
+
+ if (!dsi->enabled)
+ return;
+
+ clk_prepare_enable(dsi->cfg_clk);
+
+ drm_panel_disable(dsi->panel);
+ imx_mipi_dsi_enable_command_mode(dsi);
+ imx_mipi_dsi_disable_video_mode(dsi);
+ drm_panel_unprepare(dsi->panel);
+
+ imx_mipi_dsi_disable(dsi);
+
+ clk_disable_unprepare(dsi->cfg_clk);
+ clk_disable_unprepare(dsi->pllref_gate_clk);
+ clk_disable_unprepare(dsi->pllref_clk);
+
+ dsi->enabled = false;
+}
+
+static struct drm_encoder_helper_funcs imx_mipi_dsi_encoder_helper_funcs = {
+ .dpms = imx_mipi_dsi_encoder_dpms,
+ .mode_fixup = imx_mipi_dsi_encoder_mode_fixup,
+ .prepare = imx_mipi_dsi_encoder_prepare,
+ .mode_set = imx_mipi_dsi_encoder_mode_set,
+ .commit = imx_mipi_dsi_encoder_commit,
+ .disable = imx_mipi_dsi_encoder_disable,
+};
+
+static int imx_mipi_dsi_register(struct drm_device *drm, struct imx_mipi_dsi *dsi)
+{
+ int ret;
+
+ ret = imx_drm_encoder_parse_of(drm, &dsi->encoder, dsi->dev->of_node);
+ if (ret)
+ return ret;
+
+ drm_encoder_helper_add(&dsi->encoder, &imx_mipi_dsi_encoder_helper_funcs);
+ drm_encoder_init(drm, &dsi->encoder, &imx_mipi_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI);
+
+ drm_connector_helper_add(&dsi->connector,
+ &imx_mipi_dsi_connector_helper_funcs);
+ drm_connector_init(drm, &dsi->connector, &imx_mipi_dsi_connector_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+
+ drm_mode_connector_attach_encoder(&dsi->connector, &dsi->encoder);
+ return 0;
+}
+
+static int imx_mipi_dsi_bind(struct device *dev, struct device *master, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct drm_device *drm = data;
+ struct device_node *np = dev->of_node;
+ struct imx_mipi_dsi *dsi;
+ struct resource *res;
+ u32 val;
+ int ret;
+
+ dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+ if (!dsi)
+ return -ENOMEM;
+
+ dsi->dev = dev;
+ dsi->dsi_host.ops = &imx_mipi_dsi_host_ops;
+ dsi->dsi_host.dev = dev;
+ dsi->enabled = false;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dsi->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(dsi->base))
+ return PTR_ERR(dsi->base);
+
+ dsi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
+ if (IS_ERR(dsi->regmap))
+ return PTR_ERR(dsi->regmap);
+
+ dsi->pllref_clk = devm_clk_get(dev, "pllref");
+ if (IS_ERR(dsi->pllref_clk)) {
+ ret = PTR_ERR(dsi->pllref_clk);
+ dev_err(dev, "Unable to get pll reference clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->pllref_gate_clk = devm_clk_get(dev, "pllref_gate");
+ if (IS_ERR(dsi->pllref_gate_clk)) {
+ ret = PTR_ERR(dsi->pllref_gate_clk);
+ dev_err(dev, "Unable to get pll reference gate clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->cfg_clk = devm_clk_get(dev, "core_cfg");
+ if (IS_ERR(dsi->cfg_clk)) {
+ ret = PTR_ERR(dsi->cfg_clk);
+ dev_err(dev, "Unable to get configuration clock: %d\n", ret);
+ return ret;
+ }
+
+ clk_prepare_enable(dsi->cfg_clk);
+ val = dsi_read(dsi, DSI_VERSION);
+ clk_disable_unprepare(dsi->cfg_clk);
+
+ dev_info(dev, "version number is 0x%08x\n", val);
+
+ ret = imx_mipi_dsi_register(drm, dsi);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, dsi);
+
+ return mipi_dsi_host_register(&dsi->dsi_host);
+}
+
+static void imx_mipi_dsi_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct imx_mipi_dsi *dsi = dev_get_drvdata(dev);
+
+ mipi_dsi_host_unregister(&dsi->dsi_host);
+}
+
+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)
+{
+ return component_add(&pdev->dev, &imx_mipi_dsi_ops);
+}
+
+static int imx_mipi_dsi_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &imx_mipi_dsi_ops);
+ return 0;
+}
+
+static const struct of_device_id imx_mipi_dsi_dt_ids[] = {
+ { .compatible = "fsl,imx6q-mipi-dsi", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_mipi_dsi_dt_ids);
+
+static struct platform_driver imx_mipi_dsi_driver = {
+ .probe = imx_mipi_dsi_probe,
+ .remove = imx_mipi_dsi_remove,
+ .driver = {
+ .of_match_table = imx_mipi_dsi_dt_ids,
+ .name = DRIVER_NAME,
+ },
+};
+module_platform_driver(imx_mipi_dsi_driver);
+
+MODULE_DESCRIPTION("i.MX MIPI DSI driver");
+MODULE_AUTHOR("Liu Ying <Ying.Liu@...escale.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
--
2.1.0
--
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