drm/mediatek: Add DSI sub driver
This patch add a drm encoder/connector driver for the MIPI DSI function
block of the Mediatek display subsystem and a phy driver for the MIPI TX
D-PHY control module.
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
new file mode 100644
index 0000000..2d808e5
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -0,0 +1,913 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <video/videomode.h>
+
+#include "mtk_drm_ddp_comp.h"
+
+#define DSI_VIDEO_FIFO_DEPTH (1920 / 4)
+#define DSI_HOST_FIFO_DEPTH 64
+
+#define DSI_START 0x00
+
+#define DSI_CON_CTRL 0x10
+#define DSI_RESET BIT(0)
+#define DSI_EN BIT(1)
+
+#define DSI_MODE_CTRL 0x14
+#define MODE (3)
+#define CMD_MODE 0
+#define SYNC_PULSE_MODE 1
+#define SYNC_EVENT_MODE 2
+#define BURST_MODE 3
+#define FRM_MODE BIT(16)
+#define MIX_MODE BIT(17)
+
+#define DSI_TXRX_CTRL 0x18
+#define VC_NUM (2 << 0)
+#define LANE_NUM (0xf << 2)
+#define DIS_EOT BIT(6)
+#define NULL_EN BIT(7)
+#define TE_FREERUN BIT(8)
+#define EXT_TE_EN BIT(9)
+#define EXT_TE_EDGE BIT(10)
+#define MAX_RTN_SIZE (0xf << 12)
+#define HSTX_CKLP_EN BIT(16)
+
+#define DSI_PSCTRL 0x1c
+#define DSI_PS_WC 0x3fff
+#define DSI_PS_SEL (3 << 16)
+#define PACKED_PS_16BIT_RGB565 (0 << 16)
+#define LOOSELY_PS_18BIT_RGB666 (1 << 16)
+#define PACKED_PS_18BIT_RGB666 (2 << 16)
+#define PACKED_PS_24BIT_RGB888 (3 << 16)
+
+#define DSI_VSA_NL 0x20
+#define DSI_VBP_NL 0x24
+#define DSI_VFP_NL 0x28
+#define DSI_VACT_NL 0x2C
+#define DSI_HSA_WC 0x50
+#define DSI_HBP_WC 0x54
+#define DSI_HFP_WC 0x58
+
+#define DSI_HSTX_CKL_WC 0x64
+
+#define DSI_PHY_LCCON 0x104
+#define LC_HS_TX_EN BIT(0)
+#define LC_ULPM_EN BIT(1)
+#define LC_WAKEUP_EN BIT(2)
+
+#define DSI_PHY_LD0CON 0x108
+#define LD0_HS_TX_EN BIT(0)
+#define LD0_ULPM_EN BIT(1)
+#define LD0_WAKEUP_EN BIT(2)
+
+#define DSI_PHY_TIMECON0 0x110
+#define LPX (0xff << 0)
+#define HS_PRPR (0xff << 8)
+#define HS_ZERO (0xff << 16)
+#define HS_TRAIL (0xff << 24)
+
+#define DSI_PHY_TIMECON1 0x114
+#define TA_GO (0xff << 0)
+#define TA_SURE (0xff << 8)
+#define TA_GET (0xff << 16)
+#define DA_HS_EXIT (0xff << 24)
+
+#define DSI_PHY_TIMECON2 0x118
+#define CONT_DET (0xff << 0)
+#define CLK_ZERO (0xff << 16)
+#define CLK_TRAIL (0xff << 24)
+
+#define DSI_PHY_TIMECON3 0x11c
+#define CLK_HS_PRPR (0xff << 0)
+#define CLK_HS_POST (0xff << 8)
+#define CLK_HS_EXIT (0xff << 16)
+
+#define NS_TO_CYCLE(n, c) ((n) / (c) + (((n) % (c)) ? 1 : 0))
+
+struct phy;
+
+struct mtk_dsi {
+ struct mtk_ddp_comp ddp_comp;
+ struct device *dev;
+ struct mipi_dsi_host host;
+ struct drm_encoder encoder;
+ struct drm_connector conn;
+ struct drm_panel *panel;
+ struct drm_bridge *bridge;
+ struct phy *phy;
+
+ void __iomem *regs;
+
+ struct clk *engine_clk;
+ struct clk *digital_clk;
+ struct clk *hs_clk;
+
+ u32 data_rate;
+
+ unsigned long mode_flags;
+ enum mipi_dsi_pixel_format format;
+ unsigned int lanes;
+ struct videomode vm;
+ int refcount;
+ bool enabled;
+};
+
+static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
+{
+ return container_of(e, struct mtk_dsi, encoder);
+}
+
+static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
+{
+ return container_of(c, struct mtk_dsi, conn);
+}
+
+static inline struct mtk_dsi *host_to_dsi(struct mipi_dsi_host *h)
+{
+ return container_of(h, struct mtk_dsi, host);
+}
+
+static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data)
+{
+ u32 temp = readl(dsi->regs + offset);
+
+ writel((temp & ~mask) | (data & mask), dsi->regs + offset);
+}
+
+static void dsi_phy_timconfig(struct mtk_dsi *dsi)
+{
+ u32 timcon0, timcon1, timcon2, timcon3;
+ unsigned int ui, cycle_time;
+ unsigned int lpx;
+
+ ui = 1000 / dsi->data_rate + 0x01;
+ cycle_time = 8000 / dsi->data_rate + 0x01;
+ lpx = 5;
+
+ timcon0 = (8 << 24) | (0xa << 16) | (0x6 << 8) | lpx;
+ timcon1 = (7 << 24) | (5 * lpx << 16) | ((3 * lpx) / 2) << 8 |
+ (4 * lpx);
+ timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
+ (NS_TO_CYCLE(0x150, cycle_time) << 16);
+ timcon3 = (2 * lpx) << 16 | NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8 |
+ NS_TO_CYCLE(0x40, cycle_time);
+
+ writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
+ writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
+ writel(timcon2, dsi->regs + DSI_PHY_TIMECON2);
+ writel(timcon3, dsi->regs + DSI_PHY_TIMECON3);
+}
+
+static void mtk_dsi_enable(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, DSI_EN);
+}
+
+static void mtk_dsi_disable(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, 0);
+}
+
+static void mtk_dsi_reset(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, DSI_RESET);
+ mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
+}
+
+static int mtk_dsi_poweron(struct mtk_dsi *dsi)
+{
+ struct device *dev = dsi->dev;
+ int ret;
+
+ if (++dsi->refcount != 1)
+ return 0;
+
+ /**
+ * data_rate = (pixel_clock / 1000) * pixel_dipth * mipi_ratio;
+ * pixel_clock unit is Khz, data_rata unit is MHz, so need divide 1000.
+ * mipi_ratio is mipi clk coefficient for balance the pixel clk in mipi.
+ * we set mipi_ratio is 1.05.
+ */
+ dsi->data_rate = dsi->vm.pixelclock * 3 * 21 / (1 * 1000 * 10);
+
+ ret = clk_set_rate(dsi->hs_clk, dsi->data_rate * 1000000);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set data rate: %d\n", ret);
+ goto err_refcount;
+ }
+
+ phy_power_on(dsi->phy);
+
+ ret = clk_prepare_enable(dsi->engine_clk);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable engine clock: %d\n", ret);
+ goto err_phy_power_off;
+ }
+
+ ret = clk_prepare_enable(dsi->digital_clk);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable digital clock: %d\n", ret);
+ goto err_disable_engine_clk;
+ }
+
+ mtk_dsi_enable(dsi);
+ mtk_dsi_reset(dsi);
+ dsi_phy_timconfig(dsi);
+
+ return 0;
+
+err_disable_engine_clk:
+ clk_disable_unprepare(dsi->engine_clk);
+err_phy_power_off:
+ phy_power_off(dsi->phy);
+err_refcount:
+ dsi->refcount--;
+ return ret;
+}
+
+static void dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
+}
+
+static void dsi_clk_ulp_mode_leave(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, LC_WAKEUP_EN);
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, 0);
+}
+
+static void dsi_lane0_ulp_mode_enter(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_HS_TX_EN, 0);
+ mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
+}
+
+static void dsi_lane0_ulp_mode_leave(struct mtk_dsi *dsi)
+{
+ mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
+ mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, LD0_WAKEUP_EN);
+ mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, 0);
+}
+
+static bool dsi_clk_hs_state(struct mtk_dsi *dsi)
+{
+ u32 tmp_reg1;
+
+ tmp_reg1 = readl(dsi->regs + DSI_PHY_LCCON);
+ return ((tmp_reg1 & LC_HS_TX_EN) == 1) ? true : false;
+}
+
+static void dsi_clk_hs_mode(struct mtk_dsi *dsi, bool enter)
+{
+ if (enter && !dsi_clk_hs_state(dsi))
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, LC_HS_TX_EN);
+ else if (!enter && dsi_clk_hs_state(dsi))
+ mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
+}
+
+static void dsi_set_mode(struct mtk_dsi *dsi)
+{
+ u32 vid_mode = CMD_MODE;
+
+ if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
+ vid_mode = SYNC_PULSE_MODE;
+
+ if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
+ !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
+ vid_mode = BURST_MODE;
+ }
+
+ writel(vid_mode, dsi->regs + DSI_MODE_CTRL);
+}
+
+static void dsi_ps_control_vact(struct mtk_dsi *dsi)
+{
+ struct videomode *vm = &dsi->vm;
+ u32 dsi_buf_bpp, ps_wc;
+ u32 ps_bpp_mode;
+
+ if (dsi->format == MIPI_DSI_FMT_RGB565)
+ dsi_buf_bpp = 2;
+ else
+ dsi_buf_bpp = 3;
+
+ ps_wc = vm->hactive * dsi_buf_bpp;
+ ps_bpp_mode = ps_wc;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ ps_bpp_mode |= PACKED_PS_24BIT_RGB888;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ ps_bpp_mode |= PACKED_PS_18BIT_RGB666;
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ ps_bpp_mode |= LOOSELY_PS_18BIT_RGB666;
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ ps_bpp_mode |= PACKED_PS_16BIT_RGB565;
+ break;
+ }
+
+ writel(vm->vactive, dsi->regs + DSI_VACT_NL);
+ writel(ps_bpp_mode, dsi->regs + DSI_PSCTRL);
+ writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
+}
+
+static void dsi_rxtx_control(struct mtk_dsi *dsi)
+{
+ u32 tmp_reg;
+
+ switch (dsi->lanes) {
+ case 1:
+ tmp_reg = 1 << 2;
+ break;
+ case 2:
+ tmp_reg = 3 << 2;
+ break;
+ case 3:
+ tmp_reg = 7 << 2;
+ break;
+ case 4:
+ tmp_reg = 0xf << 2;
+ break;
+ default:
+ tmp_reg = 0xf << 2;
+ break;
+ }
+
+ writel(tmp_reg, dsi->regs + DSI_TXRX_CTRL);
+}
+
+static void dsi_ps_control(struct mtk_dsi *dsi)
+{
+ unsigned int dsi_tmp_buf_bpp;
+ u32 tmp_reg;
+
+ switch (dsi->format) {
+ case MIPI_DSI_FMT_RGB888:
+ tmp_reg = PACKED_PS_24BIT_RGB888;
+ dsi_tmp_buf_bpp = 3;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ tmp_reg = LOOSELY_PS_18BIT_RGB666;
+ dsi_tmp_buf_bpp = 3;
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ tmp_reg = PACKED_PS_18BIT_RGB666;
+ dsi_tmp_buf_bpp = 3;
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ tmp_reg = PACKED_PS_16BIT_RGB565;
+ dsi_tmp_buf_bpp = 2;
+ break;
+ default:
+ tmp_reg = PACKED_PS_24BIT_RGB888;
+ dsi_tmp_buf_bpp = 3;
+ break;
+ }
+
+ tmp_reg += dsi->vm.hactive * dsi_tmp_buf_bpp & DSI_PS_WC;
+ writel(tmp_reg, dsi->regs + DSI_PSCTRL);
+}
+
+static void dsi_config_vdo_timing(struct mtk_dsi *dsi)
+{
+ unsigned int horizontal_sync_active_byte;
+ unsigned int horizontal_backporch_byte;
+ unsigned int horizontal_frontporch_byte;
+ unsigned int dsi_tmp_buf_bpp;
+
+ struct videomode *vm = &dsi->vm;
+
+ if (dsi->format == MIPI_DSI_FMT_RGB565)
+ dsi_tmp_buf_bpp = 2;
+ else
+ dsi_tmp_buf_bpp = 3;
+
+ writel(vm->vsync_len, dsi->regs + DSI_VSA_NL);
+ writel(vm->vback_porch, dsi->regs + DSI_VBP_NL);
+ writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
+ writel(vm->vactive, dsi->regs + DSI_VACT_NL);
+
+ horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
+
+ if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
+ horizontal_backporch_byte =
+ (vm->hback_porch * dsi_tmp_buf_bpp - 10);
+ else
+ horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
+ dsi_tmp_buf_bpp - 10);
+
+ horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
+
+ writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
+ writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
+ writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
+
+ dsi_ps_control(dsi);
+}
+
+static void mtk_dsi_start(struct mtk_dsi *dsi)
+{
+ writel(0, dsi->regs + DSI_START);
+ writel(1, dsi->regs + DSI_START);
+}
+
+static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
+{
+ if (WARN_ON(dsi->refcount == 0))
+ return;
+
+ if (--dsi->refcount != 0)
+ return;
+
+ dsi_lane0_ulp_mode_enter(dsi);
+ dsi_clk_ulp_mode_enter(dsi);
+
+ mtk_dsi_disable(dsi);
+
+ clk_disable_unprepare(dsi->engine_clk);
+ clk_disable_unprepare(dsi->digital_clk);
+
+ phy_power_off(dsi->phy);
+}
+
+static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
+{
+ int ret;
+
+ if (dsi->enabled)
+ return;
+
+ if (dsi->panel) {
+ if (drm_panel_prepare(dsi->panel)) {
+ DRM_ERROR("failed to setup the panel\n");
+ return;
+ }
+ }
+
+ ret = mtk_dsi_poweron(dsi);
+ if (ret < 0) {
+ DRM_ERROR("failed to power on dsi\n");
+ return;
+ }
+
+ dsi_rxtx_control(dsi);
+
+ dsi_clk_ulp_mode_leave(dsi);
+ dsi_lane0_ulp_mode_leave(dsi);
+ dsi_clk_hs_mode(dsi, 0);
+ dsi_set_mode(dsi);
+
+ dsi_ps_control_vact(dsi);
+ dsi_config_vdo_timing(dsi);
+
+ dsi_set_mode(dsi);
+ dsi_clk_hs_mode(dsi, 1);
+
+ mtk_dsi_start(dsi);
+
+ dsi->enabled = true;
+}
+
+static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
+{
+ if (!dsi->enabled)
+ return;
+
+ if (dsi->panel) {
+ if (drm_panel_disable(dsi->panel)) {
+ DRM_ERROR("failed to disable the panel\n");
+ return;
+ }
+ }
+
+ mtk_dsi_poweroff(dsi);
+
+ dsi->enabled = false;
+}
+
+static void mtk_dsi_encoder_destroy(struct drm_encoder *encoder)
+{
+ drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = {
+ .destroy = mtk_dsi_encoder_destroy,
+};
+
+static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted)
+{
+ struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+ dsi->vm.pixelclock = adjusted->clock;
+ dsi->vm.hactive = adjusted->hdisplay;
+ dsi->vm.hback_porch = adjusted->htotal - adjusted->hsync_end;
+ dsi->vm.hfront_porch = adjusted->hsync_start - adjusted->hdisplay;
+ dsi->vm.hsync_len = adjusted->hsync_end - adjusted->hsync_start;
+
+ dsi->vm.vactive = adjusted->vdisplay;
+ dsi->vm.vback_porch = adjusted->vtotal - adjusted->vsync_end;
+ dsi->vm.vfront_porch = adjusted->vsync_start - adjusted->vdisplay;
+ dsi->vm.vsync_len = adjusted->vsync_end - adjusted->vsync_start;
+}
+
+static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)
+{
+ struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+ mtk_output_dsi_disable(dsi);
+}
+
+static void mtk_dsi_encoder_enable(struct drm_encoder *encoder)
+{
+ struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+
+ mtk_output_dsi_enable(dsi);
+}
+
+static enum drm_connector_status mtk_dsi_connector_detect(
+ struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
+{
+ struct mtk_dsi *dsi = connector_to_dsi(connector);
+
+ return drm_panel_get_modes(dsi->panel);
+}
+
+static struct drm_encoder *mtk_dsi_connector_best_encoder(
+ struct drm_connector *connector)
+{
+ struct mtk_dsi *dsi = connector_to_dsi(connector);
+
+ return &dsi->encoder;
+}
+
+static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
+ .mode_fixup = mtk_dsi_encoder_mode_fixup,
+ .mode_set = mtk_dsi_encoder_mode_set,
+ .disable = mtk_dsi_encoder_disable,
+ .enable = mtk_dsi_encoder_enable,
+};
+
+static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .detect = mtk_dsi_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs
+ mtk_dsi_connector_helper_funcs = {
+ .get_modes = mtk_dsi_connector_get_modes,
+ .best_encoder = mtk_dsi_connector_best_encoder,
+};
+
+static int mtk_drm_attach_bridge(struct drm_bridge *bridge,
+ struct drm_encoder *encoder)
+{
+ int ret;
+
+ if (!bridge)
+ return -ENOENT;
+
+ encoder->bridge = bridge;
+ bridge->encoder = encoder;
+ ret = drm_bridge_attach(encoder->dev, bridge);
+ if (ret) {
+ DRM_ERROR("Failed to attach bridge to drm\n");
+ encoder->bridge = NULL;
+ bridge->encoder = NULL;
+ }
+
+ return ret;
+}
+
+static int mtk_dsi_create_connector(struct drm_device *drm, struct mtk_dsi *dsi)
+{
+ int ret;
+
+ ret = drm_connector_init(drm, &dsi->conn, &mtk_dsi_connector_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ if (ret) {
+ DRM_ERROR("Failed to connector init to drm\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
+
+ dsi->conn.dpms = DRM_MODE_DPMS_OFF;
+ drm_mode_connector_attach_encoder(&dsi->conn, &dsi->encoder);
+
+ if (dsi->panel) {
+ ret = drm_panel_attach(dsi->panel, &dsi->conn);
+ if (ret) {
+ DRM_ERROR("Failed to attach panel to drm\n");
+ goto err_connector_cleanup;
+ }
+ }
+
+ return 0;
+
+err_connector_cleanup:
+ drm_connector_cleanup(&dsi->conn);
+ return ret;
+}
+
+static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
+{
+ int ret;
+
+ ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI, NULL);
+ if (ret) {
+ DRM_ERROR("Failed to encoder init to drm\n");
+ return ret;
+ }
+ drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
+
+ /*
+ * Currently display data paths are statically assigned to a crtc each.
+ * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
+ */
+ dsi->encoder.possible_crtcs = 1;
+
+ /* If there's a bridge, attach to it and let it create the connector */
+ ret = mtk_drm_attach_bridge(dsi->bridge, &dsi->encoder);
+ if (ret) {
+ /* Otherwise create our own connector and attach to a panel */
+ ret = mtk_dsi_create_connector(drm, dsi);
+ if (ret)
+ goto err_encoder_cleanup;
+ }
+
+ return 0;
+
+err_encoder_cleanup:
+ drm_encoder_cleanup(&dsi->encoder);
+ return ret;
+}
+
+static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
+{
+ drm_encoder_cleanup(&dsi->encoder);
+ /* Skip connector cleanup if creation was delegated to the bridge */
+ if (dsi->conn.dev) {
+ drm_connector_unregister(&dsi->conn);
+ drm_connector_cleanup(&dsi->conn);
+ }
+}
+
+static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
+{
+ struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
+
+ mtk_dsi_poweron(dsi);
+}
+
+static void mtk_dsi_ddp_stop(struct mtk_ddp_comp *comp)
+{
+ struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
+
+ mtk_dsi_poweroff(dsi);
+}
+
+static const struct mtk_ddp_comp_funcs mtk_dsi_funcs = {
+ .start = mtk_dsi_ddp_start,
+ .stop = mtk_dsi_ddp_stop,
+};
+
+static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct mtk_dsi *dsi = host_to_dsi(host);
+
+ dsi->lanes = device->lanes;
+ dsi->format = device->format;
+ dsi->mode_flags = device->mode_flags;
+
+ if (dsi->conn.dev)
+ drm_helper_hpd_irq_event(dsi->conn.dev);
+
+ return 0;
+}
+
+static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *device)
+{
+ struct mtk_dsi *dsi = host_to_dsi(host);
+
+ if (dsi->conn.dev)
+ drm_helper_hpd_irq_event(dsi->conn.dev);
+
+ return 0;
+}
+
+static const struct mipi_dsi_host_ops mtk_dsi_ops = {
+ .attach = mtk_dsi_host_attach,
+ .detach = mtk_dsi_host_detach,
+};
+
+static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
+{
+ int ret;
+ struct drm_device *drm = data;
+ struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+ ret = mtk_ddp_comp_register(drm, &dsi->ddp_comp);
+ if (ret < 0) {
+ dev_err(dev, "Failed to register component %s: %d\n",
+ dev->of_node->full_name, ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_host_register(&dsi->host);
+ if (ret < 0) {
+ dev_err(dev, "failed to register DSI host: %d\n", ret);
+ goto err_ddp_comp_unregister;
+ }
+
+ ret = mtk_dsi_create_conn_enc(drm, dsi);
+ if (ret) {
+ DRM_ERROR("Encoder create failed with %d\n", ret);
+ goto err_unregister;
+ }
+
+ return 0;
+
+err_unregister:
+ mipi_dsi_host_unregister(&dsi->host);
+err_ddp_comp_unregister:
+ mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
+ return ret;
+}
+
+static void mtk_dsi_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct drm_device *drm = data;
+ struct mtk_dsi *dsi = dev_get_drvdata(dev);
+
+ mtk_dsi_destroy_conn_enc(dsi);
+ mipi_dsi_host_unregister(&dsi->host);
+ mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
+}
+
+static const struct component_ops mtk_dsi_component_ops = {
+ .bind = mtk_dsi_bind,
+ .unbind = mtk_dsi_unbind,
+};
+
+static int mtk_dsi_probe(struct platform_device *pdev)
+{
+ struct mtk_dsi *dsi;
+ struct device *dev = &pdev->dev;
+ struct device_node *remote_node, *endpoint;
+ struct resource *regs;
+ int comp_id;
+ int ret;
+
+ dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
+ if (!dsi)
+ return -ENOMEM;
+
+ dsi->host.ops = &mtk_dsi_ops;
+ dsi->host.dev = dev;
+
+ endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+ if (endpoint) {
+ remote_node = of_graph_get_remote_port_parent(endpoint);
+ if (!remote_node) {
+ dev_err(dev, "No panel connected\n");
+ return -ENODEV;
+ }
+
+ dsi->bridge = of_drm_find_bridge(remote_node);
+ dsi->panel = of_drm_find_panel(remote_node);
+ of_node_put(remote_node);
+ if (!dsi->bridge && !dsi->panel) {
+ dev_info(dev, "Waiting for bridge or panel driver\n");
+ return -EPROBE_DEFER;
+ }
+ }
+
+ dsi->engine_clk = devm_clk_get(dev, "engine");
+ if (IS_ERR(dsi->engine_clk)) {
+ ret = PTR_ERR(dsi->engine_clk);
+ dev_err(dev, "Failed to get engine clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->digital_clk = devm_clk_get(dev, "digital");
+ if (IS_ERR(dsi->digital_clk)) {
+ ret = PTR_ERR(dsi->digital_clk);
+ dev_err(dev, "Failed to get digital clock: %d\n", ret);
+ return ret;
+ }
+
+ dsi->hs_clk = devm_clk_get(dev, "hs");
+ if (IS_ERR(dsi->hs_clk)) {
+ ret = PTR_ERR(dsi->hs_clk);
+ dev_err(dev, "Failed to get hs clock: %d\n", ret);
+ return ret;
+ }
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dsi->regs = devm_ioremap_resource(dev, regs);
+ if (IS_ERR(dsi->regs)) {
+ ret = PTR_ERR(dsi->regs);
+ dev_err(dev, "Failed to ioremap memory: %d\n", ret);
+ return ret;
+ }
+
+ dsi->phy = devm_phy_get(dev, "dphy");
+ if (IS_ERR(dsi->phy)) {
+ ret = PTR_ERR(dsi->phy);
+ dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
+ return ret;
+ }
+
+ comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
+ if (comp_id < 0) {
+ dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
+ return comp_id;
+ }
+
+ ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
+ &mtk_dsi_funcs);
+ if (ret) {
+ dev_err(dev, "Failed to initialize component: %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, dsi);
+
+ return component_add(&pdev->dev, &mtk_dsi_component_ops);
+}
+
+static int mtk_dsi_remove(struct platform_device *pdev)
+{
+ struct mtk_dsi *dsi = platform_get_drvdata(pdev);
+
+ mtk_output_dsi_disable(dsi);
+ component_del(&pdev->dev, &mtk_dsi_component_ops);
+
+ return 0;
+}
+
+static const struct of_device_id mtk_dsi_of_match[] = {
+ { .compatible = "mediatek,mt8173-dsi" },
+ { },
+};
+
+struct platform_driver mtk_dsi_driver = {
+ .probe = mtk_dsi_probe,
+ .remove = mtk_dsi_remove,
+ .driver = {
+ .name = "mtk-dsi",
+ .of_match_table = mtk_dsi_of_match,
+ },
+};