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Subject[PATCH v4 3/4] drm: imx: Add i.MX 6 MIPI DSI host driver
Date
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>

- ARM: dtsi: imx6qdl: Add support for MIPI DSI host controller
Signed-off-by: Liu Ying <Ying.Liu@freescale.com>

Cc: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@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>
---
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 146 ++++++-
drivers/gpu/drm/imx/Kconfig | 7 +
drivers/gpu/drm/imx/Makefile | 1 +
drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c | 378 ++++++++++++++++++
4 files changed, 523 insertions(+), 9 deletions(-)
create mode 100644 drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index a41a630302b6..5f2fa467734c 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -31,6 +31,8 @@
#include <drm/drm_probe_helper.h>

#define HWVER_131 0x31333100 /* IP version 1.31 */
+#define HWVER_130 0x31333000 /* IP version 1.30 */
+#define HWVER_101 0x31303000 /* IP version 1.01 */

#define DSI_VERSION 0x00
#define VERSION GENMASK(31, 8)
@@ -99,6 +101,25 @@
#define DSI_EDPI_CMD_SIZE 0x64

#define DSI_CMD_MODE_CFG 0x68
+
+#define DSI_DPI_CFG 0x0c
+#define DSI_TMR_LINE_CFG 0x28
+#define DSI_VTIMING_CFG 0x2c
+#define DSI_PHY_TMR_CFG_V101 0x30
+#define DSI_PHY_IF_CFG_V101 0x58
+#define DSI_PHY_IF_CTRL 0x5c
+#define DSI_PHY_RSTZ_V101 0x54
+#define DSI_PHY_STATUS_V101 0x60
+#define DSI_PHY_TST_CTRL0_V101 0x64
+#define DSI_GEN_HDR_V101 0x34
+#define DSI_GEN_PLD_DATA_V101 0x38
+#define DSI_CMD_MODE_CFG_V101 0x24
+#define DSI_CMD_PKT_STATUS_V101 0x3c
+#define DSI_VID_PKT_CFG 0x20
+#define DSI_VID_MODE_CFG_V101 0x1c
+#define DSI_TO_CNT_CFG_V101 0x40
+#define DSI_PCKHDL_CFG_V101 0x18
+
#define MAX_RD_PKT_SIZE_LP BIT(24)
#define DCS_LW_TX_LP BIT(19)
#define DCS_SR_0P_TX_LP BIT(18)
@@ -126,6 +147,33 @@
GEN_SW_1P_TX_LP | \
GEN_SW_0P_TX_LP)

+#define EN_TEAR_FX_V101 BIT(14)
+#define DCS_LW_TX_LP_V101 BIT(12)
+#define GEN_LW_TX_LP_V101 BIT(11)
+#define MAX_RD_PKT_SIZE_LP_V101 BIT(10)
+#define DCS_SW_2P_TX_LP_V101 BIT(9)
+#define DCS_SW_1P_TX_LP_V101 BIT(8)
+#define DCS_SW_0P_TX_LP_V101 BIT(7)
+#define GEN_SR_2P_TX_LP_V101 BIT(6)
+#define GEN_SR_1P_TX_LP_V101 BIT(5)
+#define GEN_SR_0P_TX_LP_V101 BIT(4)
+#define GEN_SW_2P_TX_LP_V101 BIT(3)
+#define GEN_SW_1P_TX_LP_V101 BIT(2)
+#define GEN_SW_0P_TX_LP_V101 BIT(1)
+
+#define CMD_MODE_ALL_LP_V101 (DCS_LW_TX_LP_V101 | \
+ GEN_LW_TX_LP_V101 | \
+ MAX_RD_PKT_SIZE_LP_V101 | \
+ DCS_SW_2P_TX_LP_V101 | \
+ DCS_SW_1P_TX_LP_V101 | \
+ DCS_SW_0P_TX_LP_V101 | \
+ GEN_SR_2P_TX_LP_V101 | \
+ GEN_SR_1P_TX_LP_V101 | \
+ GEN_SR_0P_TX_LP_V101 | \
+ GEN_SW_2P_TX_LP_V101 | \
+ GEN_SW_1P_TX_LP_V101 | \
+ GEN_SW_0P_TX_LP_V101)
+
#define DSI_GEN_HDR 0x6c
#define DSI_GEN_PLD_DATA 0x70

@@ -164,6 +212,11 @@
#define DSI_INT_MSK0 0xc4
#define DSI_INT_MSK1 0xc8

+#define DSI_ERROR_ST0_V101 0x44
+#define DSI_ERROR_ST1_V101 0x48
+#define DSI_ERROR_MSK0_V101 0x4c
+#define DSI_ERROR_MSK1_V101 0x50
+
#define DSI_PHY_TMR_RD_CFG 0xf4

#define PHY_STATUS_TIMEOUT_US 10000
@@ -357,6 +410,49 @@ static const struct dw_mipi_dsi_variant dw_mipi_dsi_v130_v131_layout = {
.cfg_gen_payload = REG_FIELD(DSI_GEN_PLD_DATA, 0, 31),
};

+static const struct dw_mipi_dsi_variant dw_mipi_dsi_v101_layout = {
+ .cfg_dpi_vid = REG_FIELD(DSI_DPI_CFG, 0, 1),
+ .cfg_dpi_color_coding = REG_FIELD(DSI_DPI_CFG, 2, 4),
+ .cfg_dpi_18loosely_en = REG_FIELD(DSI_DPI_CFG, 10, 10),
+ .cfg_dpi_vsync_active_low = REG_FIELD(DSI_DPI_CFG, 6, 6),
+ .cfg_dpi_hsync_active_low = REG_FIELD(DSI_DPI_CFG, 7, 7),
+ .cfg_cmd_mode_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 0, 0),
+ .cfg_cmd_mode_all_lp_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 1, 12),
+ .cfg_cmd_mode_ack_rqst_en = REG_FIELD(DSI_CMD_MODE_CFG_V101, 13, 13),
+ .cfg_cmd_pkt_status = REG_FIELD(DSI_CMD_PKT_STATUS_V101, 0, 14),
+ .cfg_vid_mode_en = REG_FIELD(DSI_VID_MODE_CFG_V101, 0, 0),
+ .cfg_vid_mode_type = REG_FIELD(DSI_VID_MODE_CFG_V101, 1, 2),
+ .cfg_vid_mode_low_power = REG_FIELD(DSI_VID_MODE_CFG_V101, 3, 8),
+ .cfg_vid_pkt_size = REG_FIELD(DSI_VID_PKT_CFG, 0, 10),
+ .cfg_vid_hsa_time = REG_FIELD(DSI_TMR_LINE_CFG, 0, 8),
+ .cfg_vid_hbp_time = REG_FIELD(DSI_TMR_LINE_CFG, 9, 17),
+ .cfg_vid_hline_time = REG_FIELD(DSI_TMR_LINE_CFG, 18, 31),
+ .cfg_vid_vsa_time = REG_FIELD(DSI_VTIMING_CFG, 0, 3),
+ .cfg_vid_vbp_time = REG_FIELD(DSI_VTIMING_CFG, 4, 9),
+ .cfg_vid_vfp_time = REG_FIELD(DSI_VTIMING_CFG, 10, 15),
+ .cfg_vid_vactive_time = REG_FIELD(DSI_VTIMING_CFG, 16, 26),
+ .cfg_phy_txrequestclkhs = REG_FIELD(DSI_PHY_IF_CTRL, 0, 0),
+ .cfg_phy_bta_time = REG_FIELD(DSI_PHY_TMR_CFG_V101, 0, 11),
+ .cfg_phy_lp2hs_time = REG_FIELD(DSI_PHY_TMR_CFG_V101, 12, 19),
+ .cfg_phy_hs2lp_time = REG_FIELD(DSI_PHY_TMR_CFG_V101, 20, 27),
+ .cfg_phy_testclr = REG_FIELD(DSI_PHY_TST_CTRL0_V101, 0, 0),
+ .cfg_phy_unshutdownz = REG_FIELD(DSI_PHY_RSTZ_V101, 0, 0),
+ .cfg_phy_unrstz = REG_FIELD(DSI_PHY_RSTZ_V101, 1, 1),
+ .cfg_phy_enableclk = REG_FIELD(DSI_PHY_RSTZ_V101, 2, 2),
+ .cfg_phy_nlanes = REG_FIELD(DSI_PHY_IF_CFG_V101, 0, 1),
+ .cfg_phy_stop_wait_time = REG_FIELD(DSI_PHY_IF_CFG_V101, 2, 9),
+ .cfg_phy_status = REG_FIELD(DSI_PHY_STATUS_V101, 0, 0),
+ .cfg_pckhdl_cfg = REG_FIELD(DSI_PCKHDL_CFG_V101, 0, 4),
+ .cfg_hstx_timeout_counter = REG_FIELD(DSI_TO_CNT_CFG_V101, 0, 15),
+ .cfg_lprx_timeout_counter = REG_FIELD(DSI_TO_CNT_CFG_V101, 16, 31),
+ .cfg_int_stat0 = REG_FIELD(DSI_ERROR_ST0_V101, 0, 20),
+ .cfg_int_stat1 = REG_FIELD(DSI_ERROR_ST1_V101, 0, 17),
+ .cfg_int_mask0 = REG_FIELD(DSI_ERROR_MSK0_V101, 0, 20),
+ .cfg_int_mask1 = REG_FIELD(DSI_ERROR_MSK1_V101, 0, 17),
+ .cfg_gen_hdr = REG_FIELD(DSI_GEN_HDR_V101, 0, 31),
+ .cfg_gen_payload = REG_FIELD(DSI_GEN_PLD_DATA_V101, 0, 31),
+};
+
/*
* Check if either a link to a master or slave is present
*/
@@ -459,12 +555,21 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
u32 cmd_mode_lp = 0;

+ switch (dsi->hw_version) {
+ case HWVER_130:
+ case HWVER_131:
+ cmd_mode_lp = CMD_MODE_ALL_LP;
+ break;
+ case HWVER_101:
+ cmd_mode_lp = CMD_MODE_ALL_LP_V101;
+ break;
+ }
+
if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
regmap_field_write(dsi->field_cmd_mode_ack_rqst_en, 1);

if (lpm)
- regmap_field_write(dsi->field_cmd_mode_all_lp_en,
- CMD_MODE_ALL_LP);
+ regmap_field_write(dsi->field_cmd_mode_all_lp_en, cmd_mode_lp);

regmap_field_write(dsi->field_phy_txrequestclkhs, lpm ? 0 : 1);
}
@@ -636,7 +741,7 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
VID_MODE_TYPE_NON_BURST_SYNC_EVENTS);

#ifdef CONFIG_DEBUG_FS
- if (dsi->vpg) {
+ if (dsi->hw_version > HWVER_101 && dsi->vpg) {
regmap_field_write(dsi->regs, dsi->field_vid_mode_vpg_en, 1);
regmap_field_write(dsi->regs, dsi->field_vid_mode_vpg_horiz,
dsi->vpg_horizontal ? 1 : 0);
@@ -654,9 +759,15 @@ static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,

dw_mipi_dsi_video_mode_config(dsi);

+ if (dsi->hw_version == HWVER_101)
+ regmap_field_write(dsi->field_vid_mode_en, 1);
+
regmap_field_write(dsi->field_phy_txrequestclkhs, 1);
} else {
regmap_field_write(dsi->field_cmd_mode_en, 1);
+
+ if (dsi->hw_version == HWVER_101)
+ regmap_field_write(dsi->field_vid_mode_en, 0);
}

regmap_write(dsi->regs, DSI_PWR_UP, POWERUP);
@@ -840,9 +951,11 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
regmap_field_write(dsi->field_phy_lp2hs_time, 0x40);
regmap_field_write(dsi->field_phy_hs2lp_time, 0x40);

- regmap_field_write(dsi->field_phy_max_rd_time, 10000);
- regmap_field_write(dsi->field_phy_clklp2hs_time, 0x40);
- regmap_field_write(dsi->field_phy_clkhs2lp_time, 0x40);
+ if (dsi->hw_version > HWVER_101) {
+ regmap_field_write(dsi->field_phy_max_rd_time, 10000);
+ regmap_field_write(dsi->field_phy_clklp2hs_time, 0x40);
+ regmap_field_write(dsi->field_phy_clkhs2lp_time, 0x40);
+ }
}

static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
@@ -863,7 +976,8 @@ static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi)
regmap_field_write(dsi->field_phy_unrstz, 0);
regmap_field_write(dsi->field_phy_unshutdownz, 0);

- regmap_field_write(dsi->field_phy_forcepll, 0);
+ if (dsi->hw_version > HWVER_101)
+ regmap_field_write(dsi->field_phy_forcepll, 0);

regmap_field_write(dsi->field_phy_testclr, 0);
regmap_field_write(dsi->field_phy_testclr, 1);
@@ -879,7 +993,8 @@ static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi)
regmap_field_write(dsi->field_phy_unrstz, 1);
regmap_field_write(dsi->field_phy_unshutdownz, 1);

- regmap_field_write(dsi->field_phy_forcepll, 1);
+ if (dsi->hw_version > HWVER_101)
+ regmap_field_write(dsi->field_phy_forcepll, 1);

ret = regmap_field_read_poll_timeout(dsi->field_phy_status,
val, val & PHY_LOCK,
@@ -1105,7 +1220,20 @@ static void dw_mipi_dsi_get_hw_version(struct dw_mipi_dsi *dsi)

static int dw_mipi_dsi_regmap_fields_init(struct dw_mipi_dsi *dsi)
{
- const struct dw_mipi_dsi_variant *variant = &dw_mipi_dsi_v130_v131_layout;
+ const struct dw_mipi_dsi_variant *variant;
+
+ switch (dsi->hw_version) {
+ case HWVER_130:
+ case HWVER_131:
+ variant = &dw_mipi_dsi_v130_v131_layout;
+ break;
+ case HWVER_101:
+ variant = &dw_mipi_dsi_v101_layout;
+ break;
+ default:
+ DRM_ERROR("Unrecognized DSI host controller HW revision\n");
+ return -ENODEV;
+ }

INIT_FIELD(dpi_18loosely_en);
INIT_FIELD(dpi_vid);
diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index 207bf7409dfb..b49e70e7f0fd 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -39,3 +39,10 @@ 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
+ 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 21cdcc2faabc..9a7843c59347 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 000000000000..212562aacf31
--- /dev/null
+++ b/drivers/gpu/drm/imx/dw_mipi_dsi-imx6.c
@@ -0,0 +1,378 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * i.MX6 drm driver - MIPI DSI Host Controller
+ *
+ * Copyright (C) 2011-2015 Freescale Semiconductor, Inc.
+ */
+
+#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_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+
+#include "imx-drm.h"
+
+#define DRIVER_NAME "imx-mipi-dsi"
+
+#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 device *dev;
+ struct regmap *mux_sel;
+ struct dw_mipi_dsi *mipi_dsi;
+ struct clk *pllref_clk;
+
+ struct regmap *regs;
+ 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 *enc_to_dsi(struct drm_encoder *enc)
+{
+ return container_of(enc, struct imx_mipi_dsi, encoder);
+}
+
+static void imx_mipi_dsi_set_ipu_di_mux(struct imx_mipi_dsi *dsi, int ipu_di)
+{
+ regmap_update_bits(dsi->mux_sel, IOMUXC_GPR3,
+ IMX6Q_GPR3_MIPI_MUX_CTL_MASK,
+ ipu_di << IMX6Q_GPR3_MIPI_MUX_CTL_SHIFT);
+}
+
+static const struct drm_encoder_funcs imx_mipi_dsi_encoder_funcs = {
+ .destroy = imx_drm_encoder_destroy,
+};
+
+static bool imx_mipi_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adj_mode)
+{
+ return true;
+}
+
+static int imx_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn)
+{
+ 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_encoder_commit(struct drm_encoder *encoder)
+{
+ struct imx_mipi_dsi *dsi = enc_to_dsi(encoder);
+ int mux = drm_of_encoder_active_port_id(dsi->dev->of_node, encoder);
+
+ imx_mipi_dsi_set_ipu_di_mux(dsi, mux);
+}
+
+static void imx_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+}
+
+static const struct drm_encoder_helper_funcs imx_mipi_dsi_encoder_helpers = {
+ .mode_fixup = imx_mipi_dsi_encoder_mode_fixup,
+ .commit = imx_mipi_dsi_encoder_commit,
+ .disable = imx_mipi_dsi_encoder_disable,
+ .atomic_check = imx_mipi_dsi_encoder_atomic_check,
+};
+
+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_helpers);
+ drm_encoder_init(drm, &dsi->encoder, &imx_mipi_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI, NULL);
+ return 0;
+}
+
+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 int imx_mipi_dsi_phy_init(void *priv_data)
+{
+ struct imx_mipi_dsi *dsi = priv_data;
+ struct regmap *regs = dsi->regs;
+ 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;
+ }
+
+ regmap_write(regs, DSI_PHY_IF_CTRL, PHY_IF_CTRL_RESET);
+ regmap_write(regs, DSI_PWR_UP, POWERUP);
+
+ regmap_write(regs, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
+ regmap_write(regs, DSI_PHY_TST_CTRL1, PHY_TESTEN | PHY_TESTDOUT(0) |
+ PHY_TESTDIN(0x44));
+ regmap_write(regs, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
+ regmap_write(regs, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR);
+ regmap_write(regs, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | PHY_TESTDOUT(0) |
+ PHY_TESTDIN(testdin));
+ regmap_write(regs, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
+ regmap_write(regs, 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) {
+ dev_err(dsi->dev, "failed to get bpp for pixel format %d\n",
+ format);
+ 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(mode->clock, MSEC_PER_SEC);
+ if (mpclk) {
+ /* take 1/0.7 blanking overhead into consideration */
+ target_mbps = (mpclk * (bpp / 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 %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;
+ dev_dbg(dsi->dev,
+ "real DPHY pll clock frequency is %uMbps\n",
+ *lane_mbps);
+ return 0;
+ }
+ }
+
+ dev_err(dsi->dev, "DPHY clock frequency %uMbps is out of range\n",
+ target_mbps);
+
+ return -EINVAL;
+}
+
+static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_stm_phy_ops = {
+ .init = imx_mipi_dsi_phy_init,
+ .get_lane_mbps = imx_mipi_dsi_get_lane_mbps,
+};
+
+static struct dw_mipi_dsi_plat_data imx6q_mipi_dsi_drv_data = {
+ .max_data_lanes = 2,
+ .mode_valid = imx_mipi_dsi_mode_valid,
+ .phy_ops = &dw_mipi_dsi_stm_phy_ops,
+};
+
+static const struct of_device_id imx_dsi_dt_ids[] = {
+ {
+ .compatible = "fsl,imx6q-mipi-dsi",
+ .data = &imx6q_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 = imx_mipi_dsi_register(drm, dsi);
+ if (ret)
+ return ret;
+
+ ret = dw_mipi_dsi_bind(dsi->mipi_dsi, &dsi->encoder);
+ if (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);
+
+ return dw_mipi_dsi_unbind(dsi->mipi_dsi);
+}
+
+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);
+ const struct dw_mipi_dsi_plat_data *pdata = of_id->data;
+ struct imx_mipi_dsi *dsi;
+ int ret;
+
+ dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+ if (!dsi)
+ return -ENOMEM;
+
+ dsi->dev = dev;
+
+ dsi->pllref_clk = devm_clk_get(dev, "ref");
+ if (IS_ERR(dsi->pllref_clk)) {
+ ret = PTR_ERR(dsi->pllref_clk);
+ dev_dbg(dev, "%s: Unable to get pll reference clock: %d\n",
+ __func__, 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;
+ }
+
+ 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);
+ dev_err(dev, "%s: Failed to get GPR regmap: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ dev_set_drvdata(dev, dsi);
+
+ imx6q_mipi_dsi_drv_data.priv_data = dsi;
+
+ dsi->mipi_dsi = dw_mipi_dsi_probe(pdev, pdata);
+ if (IS_ERR(dsi->mipi_dsi)) {
+ ret = PTR_ERR(dsi->mipi_dsi);
+ dev_dbg(dev, "%s: Unable to probe DW DSI host device: %d\n",
+ __func__, ret);
+ return -ENODEV;
+ }
+
+ dsi->regs = pdata->regs;
+
+ 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 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 = DRIVER_NAME,
+ },
+};
+module_platform_driver(imx_mipi_dsi_driver);
+
+MODULE_DESCRIPTION("i.MX6 MIPI DSI host controller driver");
+MODULE_AUTHOR("Liu Ying <Ying.Liu@freescale.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
--
2.24.0
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  Last update: 2019-12-02 20:34    [W:0.076 / U:24.476 seconds]
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