drivers/gpu/drm/mediatek/mtk_dpi.c - arm/linux - Git at Google

 /*
  * Copyright (c) 2014 MediaTek Inc.
  * Author: Jie Qiu <jie.qiu@mediatek.com>
  *
  * 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_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <linux/kernel.h>
 #include <linux/component.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/interrupt.h>
 #include <linux/types.h>
 #include <linux/clk.h>

 #include "mtk_dpi_regs.h"
 #include "mtk_drm_ddp_comp.h"

 enum mtk_dpi_out_bit_num {
 	MTK_DPI_OUT_BIT_NUM_8BITS,
 	MTK_DPI_OUT_BIT_NUM_10BITS,
 	MTK_DPI_OUT_BIT_NUM_12BITS,
 	MTK_DPI_OUT_BIT_NUM_16BITS
 };

 enum mtk_dpi_out_yc_map {
 	MTK_DPI_OUT_YC_MAP_RGB,
 	MTK_DPI_OUT_YC_MAP_CYCY,
 	MTK_DPI_OUT_YC_MAP_YCYC,
 	MTK_DPI_OUT_YC_MAP_CY,
 	MTK_DPI_OUT_YC_MAP_YC
 };

 enum mtk_dpi_out_channel_swap {
 	MTK_DPI_OUT_CHANNEL_SWAP_RGB,
 	MTK_DPI_OUT_CHANNEL_SWAP_GBR,
 	MTK_DPI_OUT_CHANNEL_SWAP_BRG,
 	MTK_DPI_OUT_CHANNEL_SWAP_RBG,
 	MTK_DPI_OUT_CHANNEL_SWAP_GRB,
 	MTK_DPI_OUT_CHANNEL_SWAP_BGR
 };

 enum mtk_dpi_out_color_format {
 	MTK_DPI_COLOR_FORMAT_RGB,
 	MTK_DPI_COLOR_FORMAT_RGB_FULL,
 	MTK_DPI_COLOR_FORMAT_YCBCR_444,
 	MTK_DPI_COLOR_FORMAT_YCBCR_422,
 	MTK_DPI_COLOR_FORMAT_XV_YCC,
 	MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL,
 	MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
 };

 struct mtk_dpi {
 	struct mtk_ddp_comp ddp_comp;
 	struct drm_encoder encoder;
 	void __iomem *regs;
 	struct device *dev;
 	struct clk *engine_clk;
 	struct clk *pixel_clk;
 	struct clk *tvd_clk;
 	int irq;
 	struct drm_display_mode mode;
 	enum mtk_dpi_out_color_format color_format;
 	enum mtk_dpi_out_yc_map yc_map;
 	enum mtk_dpi_out_bit_num bit_num;
 	enum mtk_dpi_out_channel_swap channel_swap;
 	bool power_sta;
 	u8 power_ctl;
 };

 static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
 {
 	return container_of(e, struct mtk_dpi, encoder);
 }

 enum mtk_dpi_polarity {
 	MTK_DPI_POLARITY_RISING,
 	MTK_DPI_POLARITY_FALLING,
 };

 enum mtk_dpi_power_ctl {
 	DPI_POWER_START = BIT(0),
 	DPI_POWER_ENABLE = BIT(1),
 };

 struct mtk_dpi_polarities {
 	enum mtk_dpi_polarity de_pol;
 	enum mtk_dpi_polarity ck_pol;
 	enum mtk_dpi_polarity hsync_pol;
 	enum mtk_dpi_polarity vsync_pol;
 };

 struct mtk_dpi_sync_param {
 	u32 sync_width;
 	u32 front_porch;
 	u32 back_porch;
 	bool shift_half_line;
 };

 struct mtk_dpi_yc_limit {
 	u16 y_top;
 	u16 y_bottom;
 	u16 c_top;
 	u16 c_bottom;
 };

 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
 {
 	u32 tmp = readl(dpi->regs + offset) & ~mask;

 	tmp |= (val & mask);
 	writel(tmp, dpi->regs + offset);
 }

 static void mtk_dpi_sw_reset(struct mtk_dpi *dpi, bool reset)
 {
 	mtk_dpi_mask(dpi, DPI_RET, reset ? RST : 0, RST);
 }

 static void mtk_dpi_enable(struct mtk_dpi *dpi)
 {
 	mtk_dpi_mask(dpi, DPI_EN, EN, EN);
 }

 static void mtk_dpi_disable(struct mtk_dpi *dpi)
 {
 	mtk_dpi_mask(dpi, DPI_EN, 0, EN);
 }

 static void mtk_dpi_config_hsync(struct mtk_dpi *dpi,
 				 struct mtk_dpi_sync_param *sync)
 {
 	mtk_dpi_mask(dpi, DPI_TGEN_HWIDTH,
 		     sync->sync_width << HPW, HPW_MASK);
 	mtk_dpi_mask(dpi, DPI_TGEN_HPORCH,
 		     sync->back_porch << HBP, HBP_MASK);
 	mtk_dpi_mask(dpi, DPI_TGEN_HPORCH, sync->front_porch << HFP,
 		     HFP_MASK);
 }

 static void mtk_dpi_config_vsync(struct mtk_dpi *dpi,
 				 struct mtk_dpi_sync_param *sync,
 				 u32 width_addr, u32 porch_addr)
 {
 	mtk_dpi_mask(dpi, width_addr,
 		     sync->sync_width << VSYNC_WIDTH_SHIFT,
 		     VSYNC_WIDTH_MASK);
 	mtk_dpi_mask(dpi, width_addr,
 		     sync->shift_half_line << VSYNC_HALF_LINE_SHIFT,
 		     VSYNC_HALF_LINE_MASK);
 	mtk_dpi_mask(dpi, porch_addr,
 		     sync->back_porch << VSYNC_BACK_PORCH_SHIFT,
 		     VSYNC_BACK_PORCH_MASK);
 	mtk_dpi_mask(dpi, porch_addr,
 		     sync->front_porch << VSYNC_FRONT_PORCH_SHIFT,
 		     VSYNC_FRONT_PORCH_MASK);
 }

 static void mtk_dpi_config_vsync_lodd(struct mtk_dpi *dpi,
 				      struct mtk_dpi_sync_param *sync)
 {
 	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH, DPI_TGEN_VPORCH);
 }

 static void mtk_dpi_config_vsync_leven(struct mtk_dpi *dpi,
 				       struct mtk_dpi_sync_param *sync)
 {
 	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_LEVEN,
 			     DPI_TGEN_VPORCH_LEVEN);
 }

 static void mtk_dpi_config_vsync_rodd(struct mtk_dpi *dpi,
 				      struct mtk_dpi_sync_param *sync)
 {
 	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_RODD,
 			     DPI_TGEN_VPORCH_RODD);
 }

 static void mtk_dpi_config_vsync_reven(struct mtk_dpi *dpi,
 				       struct mtk_dpi_sync_param *sync)
 {
 	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_REVEN,
 			     DPI_TGEN_VPORCH_REVEN);
 }

 static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
 			       struct mtk_dpi_polarities *dpi_pol)
 {
 	unsigned int pol;

 	pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) |
 	      (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) |
 	      (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
 	      (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
 	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
 		     CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
 }

 static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
 {
 	mtk_dpi_mask(dpi, DPI_CON, en_3d ? TDFP_EN : 0, TDFP_EN);
 }

 static void mtk_dpi_config_interface(struct mtk_dpi *dpi, bool inter)
 {
 	mtk_dpi_mask(dpi, DPI_CON, inter ? INTL_EN : 0, INTL_EN);
 }

 static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
 {
 	mtk_dpi_mask(dpi, DPI_SIZE, width << HSIZE, HSIZE_MASK);
 	mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
 }

 static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
 					 struct mtk_dpi_yc_limit *limit)
 {
 	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
 		     Y_LIMINT_BOT_MASK);
 	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
 		     Y_LIMINT_TOP_MASK);
 	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
 		     C_LIMIT_BOT_MASK);
 	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
 		     C_LIMIT_TOP_MASK);
 }

 static void mtk_dpi_config_bit_num(struct mtk_dpi *dpi,
 				   enum mtk_dpi_out_bit_num num)
 {
 	u32 val;

 	switch (num) {
 	case MTK_DPI_OUT_BIT_NUM_8BITS:
 		val = OUT_BIT_8;
 		break;
 	case MTK_DPI_OUT_BIT_NUM_10BITS:
 		val = OUT_BIT_10;
 		break;
 	case MTK_DPI_OUT_BIT_NUM_12BITS:
 		val = OUT_BIT_12;
 		break;
 	case MTK_DPI_OUT_BIT_NUM_16BITS:
 		val = OUT_BIT_16;
 		break;
 	default:
 		val = OUT_BIT_8;
 		break;
 	}
 	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << OUT_BIT,
 		     OUT_BIT_MASK);
 }

 static void mtk_dpi_config_yc_map(struct mtk_dpi *dpi,
 				  enum mtk_dpi_out_yc_map map)
 {
 	u32 val;

 	switch (map) {
 	case MTK_DPI_OUT_YC_MAP_RGB:
 		val = YC_MAP_RGB;
 		break;
 	case MTK_DPI_OUT_YC_MAP_CYCY:
 		val = YC_MAP_CYCY;
 		break;
 	case MTK_DPI_OUT_YC_MAP_YCYC:
 		val = YC_MAP_YCYC;
 		break;
 	case MTK_DPI_OUT_YC_MAP_CY:
 		val = YC_MAP_CY;
 		break;
 	case MTK_DPI_OUT_YC_MAP_YC:
 		val = YC_MAP_YC;
 		break;
 	default:
 		val = YC_MAP_RGB;
 		break;
 	}

 	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << YC_MAP, YC_MAP_MASK);
 }

 static void mtk_dpi_config_channel_swap(struct mtk_dpi *dpi,
 					enum mtk_dpi_out_channel_swap swap)
 {
 	u32 val;

 	switch (swap) {
 	case MTK_DPI_OUT_CHANNEL_SWAP_RGB:
 		val = SWAP_RGB;
 		break;
 	case MTK_DPI_OUT_CHANNEL_SWAP_GBR:
 		val = SWAP_GBR;
 		break;
 	case MTK_DPI_OUT_CHANNEL_SWAP_BRG:
 		val = SWAP_BRG;
 		break;
 	case MTK_DPI_OUT_CHANNEL_SWAP_RBG:
 		val = SWAP_RBG;
 		break;
 	case MTK_DPI_OUT_CHANNEL_SWAP_GRB:
 		val = SWAP_GRB;
 		break;
 	case MTK_DPI_OUT_CHANNEL_SWAP_BGR:
 		val = SWAP_BGR;
 		break;
 	default:
 		val = SWAP_RGB;
 		break;
 	}

 	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP, CH_SWAP_MASK);
 }

 static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool enable)
 {
 	mtk_dpi_mask(dpi, DPI_CON, enable ? YUV422_EN : 0, YUV422_EN);
 }

 static void mtk_dpi_config_csc_enable(struct mtk_dpi *dpi, bool enable)
 {
 	mtk_dpi_mask(dpi, DPI_CON, enable ? CSC_ENABLE : 0, CSC_ENABLE);
 }

 static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
 {
 	mtk_dpi_mask(dpi, DPI_CON, enable ? IN_RB_SWAP : 0, IN_RB_SWAP);
 }

 static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
 {
 	mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
 }

 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 					enum mtk_dpi_out_color_format format)
 {
 	if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_444) ||
 	    (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, true);
 		mtk_dpi_config_swap_input(dpi, false);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
 	} else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) ||
 		   (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, true);
 		mtk_dpi_config_csc_enable(dpi, true);
 		mtk_dpi_config_swap_input(dpi, true);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 	} else {
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, false);
 		mtk_dpi_config_swap_input(dpi, false);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 	}
 }

 static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 {
 	dpi->power_ctl &= ~pctl;

 	if ((dpi->power_ctl & DPI_POWER_START) ||
 	    (dpi->power_ctl & DPI_POWER_ENABLE))
 		return;

 	if (!dpi->power_sta)
 		return;

 	mtk_dpi_disable(dpi);
 	clk_disable_unprepare(dpi->pixel_clk);
 	clk_disable_unprepare(dpi->engine_clk);
 	dpi->power_sta = false;
 }

 static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 {
 	int ret;

 	dpi->power_ctl |= pctl;

 	if (!(dpi->power_ctl & DPI_POWER_START) &&
 	    !(dpi->power_ctl & DPI_POWER_ENABLE))
 		return 0;

 	if (dpi->power_sta)
 		return 0;

 	ret = clk_prepare_enable(dpi->engine_clk);
 	if (ret) {
 		dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
 		goto err_eng;
 	}

 	ret = clk_prepare_enable(dpi->pixel_clk);
 	if (ret) {
 		dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
 		goto err_pixel;
 	}

 	mtk_dpi_enable(dpi);
 	dpi->power_sta = true;
 	return 0;

 err_pixel:
 	clk_disable_unprepare(dpi->engine_clk);
 err_eng:
 	dpi->power_ctl &= ~pctl;
 	return ret;
 }

 static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 				    struct drm_display_mode *mode)
 {
 	struct mtk_dpi_yc_limit limit;
 	struct mtk_dpi_polarities dpi_pol;
 	struct mtk_dpi_sync_param hsync;
 	struct mtk_dpi_sync_param vsync_lodd = { 0 };
 	struct mtk_dpi_sync_param vsync_leven = { 0 };
 	struct mtk_dpi_sync_param vsync_rodd = { 0 };
 	struct mtk_dpi_sync_param vsync_reven = { 0 };
 	unsigned long pix_rate;
 	unsigned long pll_rate;
 	unsigned int factor;

 	/* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
 	pix_rate = 1000UL * mode->clock;
 	if (mode->clock <= 27000)
 		factor = 16 * 3;
 	else if (mode->clock <= 84000)
 		factor = 8 * 3;
 	else if (mode->clock <= 167000)
 		factor = 4 * 3;
 	else
 		factor = 2 * 3;
 	pll_rate = pix_rate * factor;

 	dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
 		pll_rate, pix_rate);

 	clk_set_rate(dpi->tvd_clk, pll_rate);
 	pll_rate = clk_get_rate(dpi->tvd_clk);

 	pix_rate = pll_rate / factor;
 	clk_set_rate(dpi->pixel_clk, pix_rate);
 	pix_rate = clk_get_rate(dpi->pixel_clk);

 	dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
 		pll_rate, pix_rate);

 	limit.c_bottom = 0x0010;
 	limit.c_top = 0x0FE0;
 	limit.y_bottom = 0x0010;
 	limit.y_top = 0x0FE0;

 	dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 	dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
 	dpi_pol.hsync_pol = mode->flags & DRM_MODE_FLAG_PHSYNC ?
 			    MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 	dpi_pol.vsync_pol = mode->flags & DRM_MODE_FLAG_PVSYNC ?
 			    MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;

 	hsync.sync_width = mode->hsync_end - mode->hsync_start;
 	hsync.back_porch = mode->htotal - mode->hsync_end;
 	hsync.front_porch = mode->hsync_start - mode->hdisplay;
 	hsync.shift_half_line = false;

 	vsync_lodd.sync_width = mode->vsync_end - mode->vsync_start;
 	vsync_lodd.back_porch = mode->vtotal - mode->vsync_end;
 	vsync_lodd.front_porch = mode->vsync_start - mode->vdisplay;
 	vsync_lodd.shift_half_line = false;

 	if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 	    mode->flags & DRM_MODE_FLAG_3D_MASK) {
 		vsync_leven = vsync_lodd;
 		vsync_rodd = vsync_lodd;
 		vsync_reven = vsync_lodd;
 		vsync_leven.shift_half_line = true;
 		vsync_reven.shift_half_line = true;
 	} else if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 		   !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 		vsync_leven = vsync_lodd;
 		vsync_leven.shift_half_line = true;
 	} else if (!(mode->flags & DRM_MODE_FLAG_INTERLACE) &&
 		   mode->flags & DRM_MODE_FLAG_3D_MASK) {
 		vsync_rodd = vsync_lodd;
 	}
 	mtk_dpi_sw_reset(dpi, true);
 	mtk_dpi_config_pol(dpi, &dpi_pol);

 	mtk_dpi_config_hsync(dpi, &hsync);
 	mtk_dpi_config_vsync_lodd(dpi, &vsync_lodd);
 	mtk_dpi_config_vsync_rodd(dpi, &vsync_rodd);
 	mtk_dpi_config_vsync_leven(dpi, &vsync_leven);
 	mtk_dpi_config_vsync_reven(dpi, &vsync_reven);

 	mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
 	mtk_dpi_config_interface(dpi, !!(mode->flags &
 					 DRM_MODE_FLAG_INTERLACE));
 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay / 2);
 	else
 		mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay);

 	mtk_dpi_config_channel_limit(dpi, &limit);
 	mtk_dpi_config_bit_num(dpi, dpi->bit_num);
 	mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
 	mtk_dpi_config_yc_map(dpi, dpi->yc_map);
 	mtk_dpi_config_color_format(dpi, dpi->color_format);
 	mtk_dpi_config_2n_h_fre(dpi);
 	mtk_dpi_sw_reset(dpi, false);

 	return 0;
 }

 static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
 {
 	drm_encoder_cleanup(encoder);
 }

 static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
 	.destroy = mtk_dpi_encoder_destroy,
 };

 static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
 				       const struct drm_display_mode *mode,
 				       struct drm_display_mode *adjusted_mode)
 {
 	return true;
 }

 static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
 				     struct drm_display_mode *mode,
 				     struct drm_display_mode *adjusted_mode)
 {
 	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

 	drm_mode_copy(&dpi->mode, adjusted_mode);
 }

 static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
 {
 	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

 	mtk_dpi_power_off(dpi, DPI_POWER_ENABLE);
 }

 static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
 {
 	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

 	mtk_dpi_power_on(dpi, DPI_POWER_ENABLE);
 	mtk_dpi_set_display_mode(dpi, &dpi->mode);
 }

 static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
 				struct drm_crtc_state *crtc_state,
 				struct drm_connector_state *conn_state)
 {
 	return 0;
 }

 static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
 	.mode_fixup = mtk_dpi_encoder_mode_fixup,
 	.mode_set = mtk_dpi_encoder_mode_set,
 	.disable = mtk_dpi_encoder_disable,
 	.enable = mtk_dpi_encoder_enable,
 	.atomic_check = mtk_dpi_atomic_check,
 };

 static void mtk_dpi_start(struct mtk_ddp_comp *comp)
 {
 	struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);

 	mtk_dpi_power_on(dpi, DPI_POWER_START);
 }

 static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
 {
 	struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);

 	mtk_dpi_power_off(dpi, DPI_POWER_START);
 }

 static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
 	.start = mtk_dpi_start,
 	.stop = mtk_dpi_stop,
 };

 static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 {
 	struct mtk_dpi *dpi = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;
 	int ret;

 	ret = mtk_ddp_comp_register(drm_dev, &dpi->ddp_comp);
 	if (ret < 0) {
 		dev_err(dev, "Failed to register component %s: %d\n",
 			dev->of_node->full_name, ret);
 		return ret;
 	}

 	ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
 			       DRM_MODE_ENCODER_TMDS, NULL);
 	if (ret) {
 		dev_err(dev, "Failed to initialize decoder: %d\n", ret);
 		goto err_unregister;
 	}
 	drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);

 	/* Currently DPI0 is fixed to be driven by OVL1 */
 	dpi->encoder.possible_crtcs = BIT(1);

 	dpi->encoder.bridge->encoder = &dpi->encoder;
 	ret = drm_bridge_attach(dpi->encoder.dev, dpi->encoder.bridge);
 	if (ret) {
 		dev_err(dev, "Failed to attach bridge: %d\n", ret);
 		goto err_cleanup;
 	}

 	dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
 	dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
 	dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
 	dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;

 	return 0;

 err_cleanup:
 	drm_encoder_cleanup(&dpi->encoder);
 err_unregister:
 	mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 	return ret;
 }

 static void mtk_dpi_unbind(struct device *dev, struct device *master,
 			   void *data)
 {
 	struct mtk_dpi *dpi = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;

 	drm_encoder_cleanup(&dpi->encoder);
 	mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 }

 static const struct component_ops mtk_dpi_component_ops = {
 	.bind = mtk_dpi_bind,
 	.unbind = mtk_dpi_unbind,
 };

 static int mtk_dpi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_dpi *dpi;
 	struct resource *mem;
 	struct device_node *ep, *bridge_node = NULL;
 	int comp_id;
 	int ret;

 	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
 	if (!dpi)
 		return -ENOMEM;

 	dpi->dev = dev;

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	dpi->regs = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(dpi->regs)) {
 		ret = PTR_ERR(dpi->regs);
 		dev_err(dev, "Failed to ioremap mem resource: %d\n", ret);
 		return ret;
 	}

 	dpi->engine_clk = devm_clk_get(dev, "engine");
 	if (IS_ERR(dpi->engine_clk)) {
 		ret = PTR_ERR(dpi->engine_clk);
 		dev_err(dev, "Failed to get engine clock: %d\n", ret);
 		return ret;
 	}

 	dpi->pixel_clk = devm_clk_get(dev, "pixel");
 	if (IS_ERR(dpi->pixel_clk)) {
 		ret = PTR_ERR(dpi->pixel_clk);
 		dev_err(dev, "Failed to get pixel clock: %d\n", ret);
 		return ret;
 	}

 	dpi->tvd_clk = devm_clk_get(dev, "pll");
 	if (IS_ERR(dpi->tvd_clk)) {
 		ret = PTR_ERR(dpi->tvd_clk);
 		dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
 		return ret;
 	}

 	dpi->irq = platform_get_irq(pdev, 0);
 	if (dpi->irq <= 0) {
 		dev_err(dev, "Failed to get irq: %d\n", dpi->irq);
 		return -EINVAL;
 	}

 	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
 	if (ep) {
 		bridge_node = of_graph_get_remote_port_parent(ep);
 		of_node_put(ep);
 	}
 	if (!bridge_node) {
 		dev_err(dev, "Failed to find bridge node\n");
 		return -ENODEV;
 	}

 	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);

 	dpi->encoder.bridge = of_drm_find_bridge(bridge_node);
 	of_node_put(bridge_node);
 	if (!dpi->encoder.bridge)
 		return -EPROBE_DEFER;

 	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
 	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, &dpi->ddp_comp, comp_id,
 				&mtk_dpi_funcs);
 	if (ret) {
 		dev_err(dev, "Failed to initialize component: %d\n", ret);
 		return ret;
 	}

 	platform_set_drvdata(pdev, dpi);

 	ret = component_add(dev, &mtk_dpi_component_ops);
 	if (ret) {
 		dev_err(dev, "Failed to add component: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int mtk_dpi_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &mtk_dpi_component_ops);

 	return 0;
 }

 static const struct of_device_id mtk_dpi_of_ids[] = {
 	{ .compatible = "mediatek,mt8173-dpi", },
 	{}
 };

 struct platform_driver mtk_dpi_driver = {
 	.probe = mtk_dpi_probe,
 	.remove = mtk_dpi_remove,
 	.driver = {
 		.name = "mediatek-dpi",
 		.of_match_table = mtk_dpi_of_ids,
 	},
 };
	/*
	* Copyright (c) 2014 MediaTek Inc.
	* Author: Jie Qiu <jie.qiu@mediatek.com>
	*
	* 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_crtc.h>
	#include <drm/drm_crtc_helper.h>
	#include <linux/kernel.h>
	#include <linux/component.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/of_graph.h>
	#include <linux/interrupt.h>
	#include <linux/types.h>
	#include <linux/clk.h>

	#include "mtk_dpi_regs.h"
	#include "mtk_drm_ddp_comp.h"

	enum mtk_dpi_out_bit_num {
	MTK_DPI_OUT_BIT_NUM_8BITS,
	MTK_DPI_OUT_BIT_NUM_10BITS,
	MTK_DPI_OUT_BIT_NUM_12BITS,
	MTK_DPI_OUT_BIT_NUM_16BITS
	};

	enum mtk_dpi_out_yc_map {
	MTK_DPI_OUT_YC_MAP_RGB,
	MTK_DPI_OUT_YC_MAP_CYCY,
	MTK_DPI_OUT_YC_MAP_YCYC,
	MTK_DPI_OUT_YC_MAP_CY,
	MTK_DPI_OUT_YC_MAP_YC
	};

	enum mtk_dpi_out_channel_swap {
	MTK_DPI_OUT_CHANNEL_SWAP_RGB,
	MTK_DPI_OUT_CHANNEL_SWAP_GBR,
	MTK_DPI_OUT_CHANNEL_SWAP_BRG,
	MTK_DPI_OUT_CHANNEL_SWAP_RBG,
	MTK_DPI_OUT_CHANNEL_SWAP_GRB,
	MTK_DPI_OUT_CHANNEL_SWAP_BGR
	};

	enum mtk_dpi_out_color_format {
	MTK_DPI_COLOR_FORMAT_RGB,
	MTK_DPI_COLOR_FORMAT_RGB_FULL,
	MTK_DPI_COLOR_FORMAT_YCBCR_444,
	MTK_DPI_COLOR_FORMAT_YCBCR_422,
	MTK_DPI_COLOR_FORMAT_XV_YCC,
	MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL,
	MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
	};

	struct mtk_dpi {
	struct mtk_ddp_comp ddp_comp;
	struct drm_encoder encoder;
	void __iomem *regs;
	struct device *dev;
	struct clk *engine_clk;
	struct clk *pixel_clk;
	struct clk *tvd_clk;
	int irq;
	struct drm_display_mode mode;
	enum mtk_dpi_out_color_format color_format;
	enum mtk_dpi_out_yc_map yc_map;
	enum mtk_dpi_out_bit_num bit_num;
	enum mtk_dpi_out_channel_swap channel_swap;
	bool power_sta;
	u8 power_ctl;
	};

	static inline struct mtk_dpi mtk_dpi_from_encoder(struct drm_encoder e)
	{
	return container_of(e, struct mtk_dpi, encoder);
	}

	enum mtk_dpi_polarity {
	MTK_DPI_POLARITY_RISING,
	MTK_DPI_POLARITY_FALLING,
	};

	enum mtk_dpi_power_ctl {
	DPI_POWER_START = BIT(0),
	DPI_POWER_ENABLE = BIT(1),
	};

	struct mtk_dpi_polarities {
	enum mtk_dpi_polarity de_pol;
	enum mtk_dpi_polarity ck_pol;
	enum mtk_dpi_polarity hsync_pol;
	enum mtk_dpi_polarity vsync_pol;
	};

	struct mtk_dpi_sync_param {
	u32 sync_width;
	u32 front_porch;
	u32 back_porch;
	bool shift_half_line;
	};

	struct mtk_dpi_yc_limit {
	u16 y_top;
	u16 y_bottom;
	u16 c_top;
	u16 c_bottom;
	};

	static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
	{
	u32 tmp = readl(dpi->regs + offset) & ~mask;

	tmp \|= (val & mask);
	writel(tmp, dpi->regs + offset);
	}

	static void mtk_dpi_sw_reset(struct mtk_dpi *dpi, bool reset)
	{
	mtk_dpi_mask(dpi, DPI_RET, reset ? RST : 0, RST);
	}

	static void mtk_dpi_enable(struct mtk_dpi *dpi)
	{
	mtk_dpi_mask(dpi, DPI_EN, EN, EN);
	}

	static void mtk_dpi_disable(struct mtk_dpi *dpi)
	{
	mtk_dpi_mask(dpi, DPI_EN, 0, EN);
	}

	static void mtk_dpi_config_hsync(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync)
	{
	mtk_dpi_mask(dpi, DPI_TGEN_HWIDTH,
	sync->sync_width << HPW, HPW_MASK);
	mtk_dpi_mask(dpi, DPI_TGEN_HPORCH,
	sync->back_porch << HBP, HBP_MASK);
	mtk_dpi_mask(dpi, DPI_TGEN_HPORCH, sync->front_porch << HFP,
	HFP_MASK);
	}

	static void mtk_dpi_config_vsync(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync,
	u32 width_addr, u32 porch_addr)
	{
	mtk_dpi_mask(dpi, width_addr,
	sync->sync_width << VSYNC_WIDTH_SHIFT,
	VSYNC_WIDTH_MASK);
	mtk_dpi_mask(dpi, width_addr,
	sync->shift_half_line << VSYNC_HALF_LINE_SHIFT,
	VSYNC_HALF_LINE_MASK);
	mtk_dpi_mask(dpi, porch_addr,
	sync->back_porch << VSYNC_BACK_PORCH_SHIFT,
	VSYNC_BACK_PORCH_MASK);
	mtk_dpi_mask(dpi, porch_addr,
	sync->front_porch << VSYNC_FRONT_PORCH_SHIFT,
	VSYNC_FRONT_PORCH_MASK);
	}

	static void mtk_dpi_config_vsync_lodd(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync)
	{
	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH, DPI_TGEN_VPORCH);
	}

	static void mtk_dpi_config_vsync_leven(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync)
	{
	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_LEVEN,
	DPI_TGEN_VPORCH_LEVEN);
	}

	static void mtk_dpi_config_vsync_rodd(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync)
	{
	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_RODD,
	DPI_TGEN_VPORCH_RODD);
	}

	static void mtk_dpi_config_vsync_reven(struct mtk_dpi *dpi,
	struct mtk_dpi_sync_param *sync)
	{
	mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_REVEN,
	DPI_TGEN_VPORCH_REVEN);
	}

	static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
	struct mtk_dpi_polarities *dpi_pol)
	{
	unsigned int pol;

	pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) \|
	(dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) \|
	(dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) \|
	(dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
	CK_POL \| DE_POL \| HSYNC_POL \| VSYNC_POL);
	}

	static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
	{
	mtk_dpi_mask(dpi, DPI_CON, en_3d ? TDFP_EN : 0, TDFP_EN);
	}

	static void mtk_dpi_config_interface(struct mtk_dpi *dpi, bool inter)
	{
	mtk_dpi_mask(dpi, DPI_CON, inter ? INTL_EN : 0, INTL_EN);
	}

	static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
	{
	mtk_dpi_mask(dpi, DPI_SIZE, width << HSIZE, HSIZE_MASK);
	mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
	}

	static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
	struct mtk_dpi_yc_limit *limit)
	{
	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
	Y_LIMINT_BOT_MASK);
	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
	Y_LIMINT_TOP_MASK);
	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
	C_LIMIT_BOT_MASK);
	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
	C_LIMIT_TOP_MASK);
	}

	static void mtk_dpi_config_bit_num(struct mtk_dpi *dpi,
	enum mtk_dpi_out_bit_num num)
	{
	u32 val;

	switch (num) {
	case MTK_DPI_OUT_BIT_NUM_8BITS:
	val = OUT_BIT_8;
	break;
	case MTK_DPI_OUT_BIT_NUM_10BITS:
	val = OUT_BIT_10;
	break;
	case MTK_DPI_OUT_BIT_NUM_12BITS:
	val = OUT_BIT_12;
	break;
	case MTK_DPI_OUT_BIT_NUM_16BITS:
	val = OUT_BIT_16;
	break;
	default:
	val = OUT_BIT_8;
	break;
	}
	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << OUT_BIT,
	OUT_BIT_MASK);
	}

	static void mtk_dpi_config_yc_map(struct mtk_dpi *dpi,
	enum mtk_dpi_out_yc_map map)
	{
	u32 val;

	switch (map) {
	case MTK_DPI_OUT_YC_MAP_RGB:
	val = YC_MAP_RGB;
	break;
	case MTK_DPI_OUT_YC_MAP_CYCY:
	val = YC_MAP_CYCY;
	break;
	case MTK_DPI_OUT_YC_MAP_YCYC:
	val = YC_MAP_YCYC;
	break;
	case MTK_DPI_OUT_YC_MAP_CY:
	val = YC_MAP_CY;
	break;
	case MTK_DPI_OUT_YC_MAP_YC:
	val = YC_MAP_YC;
	break;
	default:
	val = YC_MAP_RGB;
	break;
	}

	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << YC_MAP, YC_MAP_MASK);
	}

	static void mtk_dpi_config_channel_swap(struct mtk_dpi *dpi,
	enum mtk_dpi_out_channel_swap swap)
	{
	u32 val;

	switch (swap) {
	case MTK_DPI_OUT_CHANNEL_SWAP_RGB:
	val = SWAP_RGB;
	break;
	case MTK_DPI_OUT_CHANNEL_SWAP_GBR:
	val = SWAP_GBR;
	break;
	case MTK_DPI_OUT_CHANNEL_SWAP_BRG:
	val = SWAP_BRG;
	break;
	case MTK_DPI_OUT_CHANNEL_SWAP_RBG:
	val = SWAP_RBG;
	break;
	case MTK_DPI_OUT_CHANNEL_SWAP_GRB:
	val = SWAP_GRB;
	break;
	case MTK_DPI_OUT_CHANNEL_SWAP_BGR:
	val = SWAP_BGR;
	break;
	default:
	val = SWAP_RGB;
	break;
	}

	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP, CH_SWAP_MASK);
	}

	static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool enable)
	{
	mtk_dpi_mask(dpi, DPI_CON, enable ? YUV422_EN : 0, YUV422_EN);
	}

	static void mtk_dpi_config_csc_enable(struct mtk_dpi *dpi, bool enable)
	{
	mtk_dpi_mask(dpi, DPI_CON, enable ? CSC_ENABLE : 0, CSC_ENABLE);
	}

	static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
	{
	mtk_dpi_mask(dpi, DPI_CON, enable ? IN_RB_SWAP : 0, IN_RB_SWAP);
	}

	static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
	{
	mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
	}

	static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
	enum mtk_dpi_out_color_format format)
	{
	if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_444) \|\|
	(format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
	mtk_dpi_config_yuv422_enable(dpi, false);
	mtk_dpi_config_csc_enable(dpi, true);
	mtk_dpi_config_swap_input(dpi, false);
	mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
	} else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) \|\|
	(format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
	mtk_dpi_config_yuv422_enable(dpi, true);
	mtk_dpi_config_csc_enable(dpi, true);
	mtk_dpi_config_swap_input(dpi, true);
	mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
	} else {
	mtk_dpi_config_yuv422_enable(dpi, false);
	mtk_dpi_config_csc_enable(dpi, false);
	mtk_dpi_config_swap_input(dpi, false);
	mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
	}
	}

	static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
	{
	dpi->power_ctl &= ~pctl;

	if ((dpi->power_ctl & DPI_POWER_START) \|\|
	(dpi->power_ctl & DPI_POWER_ENABLE))
	return;

	if (!dpi->power_sta)
	return;

	mtk_dpi_disable(dpi);
	clk_disable_unprepare(dpi->pixel_clk);
	clk_disable_unprepare(dpi->engine_clk);
	dpi->power_sta = false;
	}

	static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
	{
	int ret;

	dpi->power_ctl \|= pctl;

	if (!(dpi->power_ctl & DPI_POWER_START) &&
	!(dpi->power_ctl & DPI_POWER_ENABLE))
	return 0;

	if (dpi->power_sta)
	return 0;

	ret = clk_prepare_enable(dpi->engine_clk);
	if (ret) {
	dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
	goto err_eng;
	}

	ret = clk_prepare_enable(dpi->pixel_clk);
	if (ret) {
	dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
	goto err_pixel;
	}

	mtk_dpi_enable(dpi);
	dpi->power_sta = true;
	return 0;

	err_pixel:
	clk_disable_unprepare(dpi->engine_clk);
	err_eng:
	dpi->power_ctl &= ~pctl;
	return ret;
	}

	static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
	struct drm_display_mode *mode)
	{
	struct mtk_dpi_yc_limit limit;
	struct mtk_dpi_polarities dpi_pol;
	struct mtk_dpi_sync_param hsync;
	struct mtk_dpi_sync_param vsync_lodd = { 0 };
	struct mtk_dpi_sync_param vsync_leven = { 0 };
	struct mtk_dpi_sync_param vsync_rodd = { 0 };
	struct mtk_dpi_sync_param vsync_reven = { 0 };
	unsigned long pix_rate;
	unsigned long pll_rate;
	unsigned int factor;

	/* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
	pix_rate = 1000UL * mode->clock;
	if (mode->clock <= 27000)
	factor = 16 * 3;
	else if (mode->clock <= 84000)
	factor = 8 * 3;
	else if (mode->clock <= 167000)
	factor = 4 * 3;
	else
	factor = 2 * 3;
	pll_rate = pix_rate * factor;

	dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
	pll_rate, pix_rate);

	clk_set_rate(dpi->tvd_clk, pll_rate);
	pll_rate = clk_get_rate(dpi->tvd_clk);

	pix_rate = pll_rate / factor;
	clk_set_rate(dpi->pixel_clk, pix_rate);
	pix_rate = clk_get_rate(dpi->pixel_clk);

	dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
	pll_rate, pix_rate);

	limit.c_bottom = 0x0010;
	limit.c_top = 0x0FE0;
	limit.y_bottom = 0x0010;
	limit.y_top = 0x0FE0;

	dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
	dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
	dpi_pol.hsync_pol = mode->flags & DRM_MODE_FLAG_PHSYNC ?
	MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
	dpi_pol.vsync_pol = mode->flags & DRM_MODE_FLAG_PVSYNC ?
	MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;

	hsync.sync_width = mode->hsync_end - mode->hsync_start;
	hsync.back_porch = mode->htotal - mode->hsync_end;
	hsync.front_porch = mode->hsync_start - mode->hdisplay;
	hsync.shift_half_line = false;

	vsync_lodd.sync_width = mode->vsync_end - mode->vsync_start;
	vsync_lodd.back_porch = mode->vtotal - mode->vsync_end;
	vsync_lodd.front_porch = mode->vsync_start - mode->vdisplay;
	vsync_lodd.shift_half_line = false;

	if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
	mode->flags & DRM_MODE_FLAG_3D_MASK) {
	vsync_leven = vsync_lodd;
	vsync_rodd = vsync_lodd;
	vsync_reven = vsync_lodd;
	vsync_leven.shift_half_line = true;
	vsync_reven.shift_half_line = true;
	} else if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
	!(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
	vsync_leven = vsync_lodd;
	vsync_leven.shift_half_line = true;
	} else if (!(mode->flags & DRM_MODE_FLAG_INTERLACE) &&
	mode->flags & DRM_MODE_FLAG_3D_MASK) {
	vsync_rodd = vsync_lodd;
	}
	mtk_dpi_sw_reset(dpi, true);
	mtk_dpi_config_pol(dpi, &dpi_pol);

	mtk_dpi_config_hsync(dpi, &hsync);
	mtk_dpi_config_vsync_lodd(dpi, &vsync_lodd);
	mtk_dpi_config_vsync_rodd(dpi, &vsync_rodd);
	mtk_dpi_config_vsync_leven(dpi, &vsync_leven);
	mtk_dpi_config_vsync_reven(dpi, &vsync_reven);

	mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
	mtk_dpi_config_interface(dpi, !!(mode->flags &
	DRM_MODE_FLAG_INTERLACE));
	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
	mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay / 2);
	else
	mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay);

	mtk_dpi_config_channel_limit(dpi, &limit);
	mtk_dpi_config_bit_num(dpi, dpi->bit_num);
	mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
	mtk_dpi_config_yc_map(dpi, dpi->yc_map);
	mtk_dpi_config_color_format(dpi, dpi->color_format);
	mtk_dpi_config_2n_h_fre(dpi);
	mtk_dpi_sw_reset(dpi, false);

	return 0;
	}

	static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
	{
	drm_encoder_cleanup(encoder);
	}

	static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
	.destroy = mtk_dpi_encoder_destroy,
	};

	static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	return true;
	}

	static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

	drm_mode_copy(&dpi->mode, adjusted_mode);
	}

	static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
	{
	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

	mtk_dpi_power_off(dpi, DPI_POWER_ENABLE);
	}

	static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
	{
	struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);

	mtk_dpi_power_on(dpi, DPI_POWER_ENABLE);
	mtk_dpi_set_display_mode(dpi, &dpi->mode);
	}

	static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
	struct drm_crtc_state *crtc_state,
	struct drm_connector_state *conn_state)
	{
	return 0;
	}

	static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
	.mode_fixup = mtk_dpi_encoder_mode_fixup,
	.mode_set = mtk_dpi_encoder_mode_set,
	.disable = mtk_dpi_encoder_disable,
	.enable = mtk_dpi_encoder_enable,
	.atomic_check = mtk_dpi_atomic_check,
	};

	static void mtk_dpi_start(struct mtk_ddp_comp *comp)
	{
	struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);

	mtk_dpi_power_on(dpi, DPI_POWER_START);
	}

	static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
	{
	struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);

	mtk_dpi_power_off(dpi, DPI_POWER_START);
	}

	static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
	.start = mtk_dpi_start,
	.stop = mtk_dpi_stop,
	};

	static int mtk_dpi_bind(struct device dev, struct device master, void *data)
	{
	struct mtk_dpi *dpi = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;
	int ret;

	ret = mtk_ddp_comp_register(drm_dev, &dpi->ddp_comp);
	if (ret < 0) {
	dev_err(dev, "Failed to register component %s: %d\n",
	dev->of_node->full_name, ret);
	return ret;
	}

	ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
	DRM_MODE_ENCODER_TMDS, NULL);
	if (ret) {
	dev_err(dev, "Failed to initialize decoder: %d\n", ret);
	goto err_unregister;
	}
	drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);

	/* Currently DPI0 is fixed to be driven by OVL1 */
	dpi->encoder.possible_crtcs = BIT(1);

	dpi->encoder.bridge->encoder = &dpi->encoder;
	ret = drm_bridge_attach(dpi->encoder.dev, dpi->encoder.bridge);
	if (ret) {
	dev_err(dev, "Failed to attach bridge: %d\n", ret);
	goto err_cleanup;
	}

	dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
	dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
	dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
	dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;

	return 0;

	err_cleanup:
	drm_encoder_cleanup(&dpi->encoder);
	err_unregister:
	mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
	return ret;
	}

	static void mtk_dpi_unbind(struct device dev, struct device master,
	void *data)
	{
	struct mtk_dpi *dpi = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;

	drm_encoder_cleanup(&dpi->encoder);
	mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
	}

	static const struct component_ops mtk_dpi_component_ops = {
	.bind = mtk_dpi_bind,
	.unbind = mtk_dpi_unbind,
	};

	static int mtk_dpi_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct mtk_dpi *dpi;
	struct resource *mem;
	struct device_node ep, bridge_node = NULL;
	int comp_id;
	int ret;

	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
	if (!dpi)
	return -ENOMEM;

	dpi->dev = dev;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	dpi->regs = devm_ioremap_resource(dev, mem);
	if (IS_ERR(dpi->regs)) {
	ret = PTR_ERR(dpi->regs);
	dev_err(dev, "Failed to ioremap mem resource: %d\n", ret);
	return ret;
	}

	dpi->engine_clk = devm_clk_get(dev, "engine");
	if (IS_ERR(dpi->engine_clk)) {
	ret = PTR_ERR(dpi->engine_clk);
	dev_err(dev, "Failed to get engine clock: %d\n", ret);
	return ret;
	}

	dpi->pixel_clk = devm_clk_get(dev, "pixel");
	if (IS_ERR(dpi->pixel_clk)) {
	ret = PTR_ERR(dpi->pixel_clk);
	dev_err(dev, "Failed to get pixel clock: %d\n", ret);
	return ret;
	}

	dpi->tvd_clk = devm_clk_get(dev, "pll");
	if (IS_ERR(dpi->tvd_clk)) {
	ret = PTR_ERR(dpi->tvd_clk);
	dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
	return ret;
	}

	dpi->irq = platform_get_irq(pdev, 0);
	if (dpi->irq <= 0) {
	dev_err(dev, "Failed to get irq: %d\n", dpi->irq);
	return -EINVAL;
	}

	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
	if (ep) {
	bridge_node = of_graph_get_remote_port_parent(ep);
	of_node_put(ep);
	}
	if (!bridge_node) {
	dev_err(dev, "Failed to find bridge node\n");
	return -ENODEV;
	}

	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);

	dpi->encoder.bridge = of_drm_find_bridge(bridge_node);
	of_node_put(bridge_node);
	if (!dpi->encoder.bridge)
	return -EPROBE_DEFER;

	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
	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, &dpi->ddp_comp, comp_id,
	&mtk_dpi_funcs);
	if (ret) {
	dev_err(dev, "Failed to initialize component: %d\n", ret);
	return ret;
	}

	platform_set_drvdata(pdev, dpi);

	ret = component_add(dev, &mtk_dpi_component_ops);
	if (ret) {
	dev_err(dev, "Failed to add component: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int mtk_dpi_remove(struct platform_device *pdev)
	{
	component_del(&pdev->dev, &mtk_dpi_component_ops);

	return 0;
	}

	static const struct of_device_id mtk_dpi_of_ids[] = {
	{ .compatible = "mediatek,mt8173-dpi", },
	{}
	};

	struct platform_driver mtk_dpi_driver = {
	.probe = mtk_dpi_probe,
	.remove = mtk_dpi_remove,
	.driver = {
	.name = "mediatek-dpi",
	.of_match_table = mtk_dpi_of_ids,
	},
	};