1 files changed, 800 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
new file mode 100644
index 000000000..ac83d6b89
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -0,0 +1,800 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Shobhit Kumar <shobhit.kumar@intel.com>
+ *
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
+#include <drm/i915_drm.h>
+#include <linux/gpio/consumer.h>
+#include <linux/slab.h>
+#include <video/mipi_display.h>
+#include <asm/intel-mid.h>
+#include <video/mipi_display.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include "intel_dsi.h"
+
+#define MIPI_TRANSFER_MODE_SHIFT	0
+#define MIPI_VIRTUAL_CHANNEL_SHIFT	1
+#define MIPI_PORT_SHIFT			3
+
+#define PREPARE_CNT_MAX		0x3F
+#define EXIT_ZERO_CNT_MAX	0x3F
+#define CLK_ZERO_CNT_MAX	0xFF
+#define TRAIL_CNT_MAX		0x1F
+
+#define NS_KHZ_RATIO 1000000
+
+/* base offsets for gpio pads */
+#define VLV_GPIO_NC_0_HV_DDI0_HPD	0x4130
+#define VLV_GPIO_NC_1_HV_DDI0_DDC_SDA	0x4120
+#define VLV_GPIO_NC_2_HV_DDI0_DDC_SCL	0x4110
+#define VLV_GPIO_NC_3_PANEL0_VDDEN	0x4140
+#define VLV_GPIO_NC_4_PANEL0_BKLTEN	0x4150
+#define VLV_GPIO_NC_5_PANEL0_BKLTCTL	0x4160
+#define VLV_GPIO_NC_6_HV_DDI1_HPD	0x4180
+#define VLV_GPIO_NC_7_HV_DDI1_DDC_SDA	0x4190
+#define VLV_GPIO_NC_8_HV_DDI1_DDC_SCL	0x4170
+#define VLV_GPIO_NC_9_PANEL1_VDDEN	0x4100
+#define VLV_GPIO_NC_10_PANEL1_BKLTEN	0x40E0
+#define VLV_GPIO_NC_11_PANEL1_BKLTCTL	0x40F0
+
+#define VLV_GPIO_PCONF0(base_offset)	(base_offset)
+#define VLV_GPIO_PAD_VAL(base_offset)	((base_offset) + 8)
+
+struct gpio_map {
+	u16 base_offset;
+	bool init;
+};
+
+static struct gpio_map vlv_gpio_table[] = {
+	{ VLV_GPIO_NC_0_HV_DDI0_HPD },
+	{ VLV_GPIO_NC_1_HV_DDI0_DDC_SDA },
+	{ VLV_GPIO_NC_2_HV_DDI0_DDC_SCL },
+	{ VLV_GPIO_NC_3_PANEL0_VDDEN },
+	{ VLV_GPIO_NC_4_PANEL0_BKLTEN },
+	{ VLV_GPIO_NC_5_PANEL0_BKLTCTL },
+	{ VLV_GPIO_NC_6_HV_DDI1_HPD },
+	{ VLV_GPIO_NC_7_HV_DDI1_DDC_SDA },
+	{ VLV_GPIO_NC_8_HV_DDI1_DDC_SCL },
+	{ VLV_GPIO_NC_9_PANEL1_VDDEN },
+	{ VLV_GPIO_NC_10_PANEL1_BKLTEN },
+	{ VLV_GPIO_NC_11_PANEL1_BKLTCTL },
+};
+
+#define CHV_GPIO_IDX_START_N		0
+#define CHV_GPIO_IDX_START_E		73
+#define CHV_GPIO_IDX_START_SW		100
+#define CHV_GPIO_IDX_START_SE		198
+
+#define CHV_VBT_MAX_PINS_PER_FMLY	15
+
+#define CHV_GPIO_PAD_CFG0(f, i)		(0x4400 + (f) * 0x400 + (i) * 8)
+#define  CHV_GPIO_GPIOEN		(1 << 15)
+#define  CHV_GPIO_GPIOCFG_GPIO		(0 << 8)
+#define  CHV_GPIO_GPIOCFG_GPO		(1 << 8)
+#define  CHV_GPIO_GPIOCFG_GPI		(2 << 8)
+#define  CHV_GPIO_GPIOCFG_HIZ		(3 << 8)
+#define  CHV_GPIO_GPIOTXSTATE(state)	((!!(state)) << 1)
+
+#define CHV_GPIO_PAD_CFG1(f, i)		(0x4400 + (f) * 0x400 + (i) * 8 + 4)
+#define  CHV_GPIO_CFGLOCK		(1 << 31)
+
+static inline enum port intel_dsi_seq_port_to_port(u8 port)
+{
+	return port ? PORT_C : PORT_A;
+}
+
+static const u8 *mipi_exec_send_packet(struct intel_dsi *intel_dsi,
+				       const u8 *data)
+{
+	struct mipi_dsi_device *dsi_device;
+	u8 type, flags, seq_port;
+	u16 len;
+	enum port port;
+
+	DRM_DEBUG_KMS("\n");
+
+	flags = *data++;
+	type = *data++;
+
+	len = *((u16 *) data);
+	data += 2;
+
+	seq_port = (flags >> MIPI_PORT_SHIFT) & 3;
+
+	/* For DSI single link on Port A & C, the seq_port value which is
+	 * parsed from Sequence Block#53 of VBT has been set to 0
+	 * Now, read/write of packets for the DSI single link on Port A and
+	 * Port C will based on the DVO port from VBT block 2.
+	 */
+	if (intel_dsi->ports == (1 << PORT_C))
+		port = PORT_C;
+	else
+		port = intel_dsi_seq_port_to_port(seq_port);
+
+	dsi_device = intel_dsi->dsi_hosts[port]->device;
+	if (!dsi_device) {
+		DRM_DEBUG_KMS("no dsi device for port %c\n", port_name(port));
+		goto out;
+	}
+
+	if ((flags >> MIPI_TRANSFER_MODE_SHIFT) & 1)
+		dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
+	else
+		dsi_device->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	dsi_device->channel = (flags >> MIPI_VIRTUAL_CHANNEL_SHIFT) & 3;
+
+	switch (type) {
+	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
+		mipi_dsi_generic_write(dsi_device, NULL, 0);
+		break;
+	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
+		mipi_dsi_generic_write(dsi_device, data, 1);
+		break;
+	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
+		mipi_dsi_generic_write(dsi_device, data, 2);
+		break;
+	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
+	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
+	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
+		DRM_DEBUG_DRIVER("Generic Read not yet implemented or used\n");
+		break;
+	case MIPI_DSI_GENERIC_LONG_WRITE:
+		mipi_dsi_generic_write(dsi_device, data, len);
+		break;
+	case MIPI_DSI_DCS_SHORT_WRITE:
+		mipi_dsi_dcs_write_buffer(dsi_device, data, 1);
+		break;
+	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
+		mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
+		break;
+	case MIPI_DSI_DCS_READ:
+		DRM_DEBUG_DRIVER("DCS Read not yet implemented or used\n");
+		break;
+	case MIPI_DSI_DCS_LONG_WRITE:
+		mipi_dsi_dcs_write_buffer(dsi_device, data, len);
+		break;
+	}
+
+	vlv_dsi_wait_for_fifo_empty(intel_dsi, port);
+
+out:
+	data += len;
+
+	return data;
+}
+
+static const u8 *mipi_exec_delay(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	u32 delay = *((const u32 *) data);
+
+	DRM_DEBUG_KMS("\n");
+
+	usleep_range(delay, delay + 10);
+	data += 4;
+
+	return data;
+}
+
+static void vlv_exec_gpio(struct drm_i915_private *dev_priv,
+			  u8 gpio_source, u8 gpio_index, bool value)
+{
+	struct gpio_map *map;
+	u16 pconf0, padval;
+	u32 tmp;
+	u8 port;
+
+	if (gpio_index >= ARRAY_SIZE(vlv_gpio_table)) {
+		DRM_DEBUG_KMS("unknown gpio index %u\n", gpio_index);
+		return;
+	}
+
+	map = &vlv_gpio_table[gpio_index];
+
+	if (dev_priv->vbt.dsi.seq_version >= 3) {
+		/* XXX: this assumes vlv_gpio_table only has NC GPIOs. */
+		port = IOSF_PORT_GPIO_NC;
+	} else {
+		if (gpio_source == 0) {
+			port = IOSF_PORT_GPIO_NC;
+		} else if (gpio_source == 1) {
+			DRM_DEBUG_KMS("SC gpio not supported\n");
+			return;
+		} else {
+			DRM_DEBUG_KMS("unknown gpio source %u\n", gpio_source);
+			return;
+		}
+	}
+
+	pconf0 = VLV_GPIO_PCONF0(map->base_offset);
+	padval = VLV_GPIO_PAD_VAL(map->base_offset);
+
+	mutex_lock(&dev_priv->sb_lock);
+	if (!map->init) {
+		/* FIXME: remove constant below */
+		vlv_iosf_sb_write(dev_priv, port, pconf0, 0x2000CC00);
+		map->init = true;
+	}
+
+	tmp = 0x4 | value;
+	vlv_iosf_sb_write(dev_priv, port, padval, tmp);
+	mutex_unlock(&dev_priv->sb_lock);
+}
+
+static void chv_exec_gpio(struct drm_i915_private *dev_priv,
+			  u8 gpio_source, u8 gpio_index, bool value)
+{
+	u16 cfg0, cfg1;
+	u16 family_num;
+	u8 port;
+
+	if (dev_priv->vbt.dsi.seq_version >= 3) {
+		if (gpio_index >= CHV_GPIO_IDX_START_SE) {
+			/* XXX: it's unclear whether 255->57 is part of SE. */
+			gpio_index -= CHV_GPIO_IDX_START_SE;
+			port = CHV_IOSF_PORT_GPIO_SE;
+		} else if (gpio_index >= CHV_GPIO_IDX_START_SW) {
+			gpio_index -= CHV_GPIO_IDX_START_SW;
+			port = CHV_IOSF_PORT_GPIO_SW;
+		} else if (gpio_index >= CHV_GPIO_IDX_START_E) {
+			gpio_index -= CHV_GPIO_IDX_START_E;
+			port = CHV_IOSF_PORT_GPIO_E;
+		} else {
+			port = CHV_IOSF_PORT_GPIO_N;
+		}
+	} else {
+		/* XXX: The spec is unclear about CHV GPIO on seq v2 */
+		if (gpio_source != 0) {
+			DRM_DEBUG_KMS("unknown gpio source %u\n", gpio_source);
+			return;
+		}
+
+		if (gpio_index >= CHV_GPIO_IDX_START_E) {
+			DRM_DEBUG_KMS("invalid gpio index %u for GPIO N\n",
+				      gpio_index);
+			return;
+		}
+
+		port = CHV_IOSF_PORT_GPIO_N;
+	}
+
+	family_num = gpio_index / CHV_VBT_MAX_PINS_PER_FMLY;
+	gpio_index = gpio_index % CHV_VBT_MAX_PINS_PER_FMLY;
+
+	cfg0 = CHV_GPIO_PAD_CFG0(family_num, gpio_index);
+	cfg1 = CHV_GPIO_PAD_CFG1(family_num, gpio_index);
+
+	mutex_lock(&dev_priv->sb_lock);
+	vlv_iosf_sb_write(dev_priv, port, cfg1, 0);
+	vlv_iosf_sb_write(dev_priv, port, cfg0,
+			  CHV_GPIO_GPIOEN | CHV_GPIO_GPIOCFG_GPO |
+			  CHV_GPIO_GPIOTXSTATE(value));
+	mutex_unlock(&dev_priv->sb_lock);
+}
+
+static void bxt_exec_gpio(struct drm_i915_private *dev_priv,
+			  u8 gpio_source, u8 gpio_index, bool value)
+{
+	/* XXX: this table is a quick ugly hack. */
+	static struct gpio_desc *bxt_gpio_table[U8_MAX + 1];
+	struct gpio_desc *gpio_desc = bxt_gpio_table[gpio_index];
+
+	if (!gpio_desc) {
+		gpio_desc = devm_gpiod_get_index(dev_priv->drm.dev,
+						 NULL, gpio_index,
+						 value ? GPIOD_OUT_LOW :
+						 GPIOD_OUT_HIGH);
+
+		if (IS_ERR_OR_NULL(gpio_desc)) {
+			DRM_ERROR("GPIO index %u request failed (%ld)\n",
+				  gpio_index, PTR_ERR(gpio_desc));
+			return;
+		}
+
+		bxt_gpio_table[gpio_index] = gpio_desc;
+	}
+
+	gpiod_set_value(gpio_desc, value);
+}
+
+static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	struct drm_device *dev = intel_dsi->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	u8 gpio_source, gpio_index = 0, gpio_number;
+	bool value;
+
+	DRM_DEBUG_KMS("\n");
+
+	if (dev_priv->vbt.dsi.seq_version >= 3)
+		gpio_index = *data++;
+
+	gpio_number = *data++;
+
+	/* gpio source in sequence v2 only */
+	if (dev_priv->vbt.dsi.seq_version == 2)
+		gpio_source = (*data >> 1) & 3;
+	else
+		gpio_source = 0;
+
+	/* pull up/down */
+	value = *data++ & 1;
+
+	if (IS_VALLEYVIEW(dev_priv))
+		vlv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
+	else if (IS_CHERRYVIEW(dev_priv))
+		chv_exec_gpio(dev_priv, gpio_source, gpio_number, value);
+	else
+		bxt_exec_gpio(dev_priv, gpio_source, gpio_index, value);
+
+	return data;
+}
+
+static const u8 *mipi_exec_i2c(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	DRM_DEBUG_KMS("Skipping I2C element execution\n");
+
+	return data + *(data + 6) + 7;
+}
+
+static const u8 *mipi_exec_spi(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	DRM_DEBUG_KMS("Skipping SPI element execution\n");
+
+	return data + *(data + 5) + 6;
+}
+
+static const u8 *mipi_exec_pmic(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	DRM_DEBUG_KMS("Skipping PMIC element execution\n");
+
+	return data + 15;
+}
+
+typedef const u8 * (*fn_mipi_elem_exec)(struct intel_dsi *intel_dsi,
+					const u8 *data);
+static const fn_mipi_elem_exec exec_elem[] = {
+	[MIPI_SEQ_ELEM_SEND_PKT] = mipi_exec_send_packet,
+	[MIPI_SEQ_ELEM_DELAY] = mipi_exec_delay,
+	[MIPI_SEQ_ELEM_GPIO] = mipi_exec_gpio,
+	[MIPI_SEQ_ELEM_I2C] = mipi_exec_i2c,
+	[MIPI_SEQ_ELEM_SPI] = mipi_exec_spi,
+	[MIPI_SEQ_ELEM_PMIC] = mipi_exec_pmic,
+};
+
+/*
+ * MIPI Sequence from VBT #53 parsing logic
+ * We have already separated each seqence during bios parsing
+ * Following is generic execution function for any sequence
+ */
+
+static const char * const seq_name[] = {
+	[MIPI_SEQ_DEASSERT_RESET] = "MIPI_SEQ_DEASSERT_RESET",
+	[MIPI_SEQ_INIT_OTP] = "MIPI_SEQ_INIT_OTP",
+	[MIPI_SEQ_DISPLAY_ON] = "MIPI_SEQ_DISPLAY_ON",
+	[MIPI_SEQ_DISPLAY_OFF]  = "MIPI_SEQ_DISPLAY_OFF",
+	[MIPI_SEQ_ASSERT_RESET] = "MIPI_SEQ_ASSERT_RESET",
+	[MIPI_SEQ_BACKLIGHT_ON] = "MIPI_SEQ_BACKLIGHT_ON",
+	[MIPI_SEQ_BACKLIGHT_OFF] = "MIPI_SEQ_BACKLIGHT_OFF",
+	[MIPI_SEQ_TEAR_ON] = "MIPI_SEQ_TEAR_ON",
+	[MIPI_SEQ_TEAR_OFF] = "MIPI_SEQ_TEAR_OFF",
+	[MIPI_SEQ_POWER_ON] = "MIPI_SEQ_POWER_ON",
+	[MIPI_SEQ_POWER_OFF] = "MIPI_SEQ_POWER_OFF",
+};
+
+static const char *sequence_name(enum mipi_seq seq_id)
+{
+	if (seq_id < ARRAY_SIZE(seq_name) && seq_name[seq_id])
+		return seq_name[seq_id];
+	else
+		return "(unknown)";
+}
+
+void intel_dsi_vbt_exec_sequence(struct intel_dsi *intel_dsi,
+				 enum mipi_seq seq_id)
+{
+	struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
+	const u8 *data;
+	fn_mipi_elem_exec mipi_elem_exec;
+
+	if (WARN_ON(seq_id >= ARRAY_SIZE(dev_priv->vbt.dsi.sequence)))
+		return;
+
+	data = dev_priv->vbt.dsi.sequence[seq_id];
+	if (!data)
+		return;
+
+	WARN_ON(*data != seq_id);
+
+	DRM_DEBUG_KMS("Starting MIPI sequence %d - %s\n",
+		      seq_id, sequence_name(seq_id));
+
+	/* Skip Sequence Byte. */
+	data++;
+
+	/* Skip Size of Sequence. */
+	if (dev_priv->vbt.dsi.seq_version >= 3)
+		data += 4;
+
+	while (1) {
+		u8 operation_byte = *data++;
+		u8 operation_size = 0;
+
+		if (operation_byte == MIPI_SEQ_ELEM_END)
+			break;
+
+		if (operation_byte < ARRAY_SIZE(exec_elem))
+			mipi_elem_exec = exec_elem[operation_byte];
+		else
+			mipi_elem_exec = NULL;
+
+		/* Size of Operation. */
+		if (dev_priv->vbt.dsi.seq_version >= 3)
+			operation_size = *data++;
+
+		if (mipi_elem_exec) {
+			const u8 *next = data + operation_size;
+
+			data = mipi_elem_exec(intel_dsi, data);
+
+			/* Consistency check if we have size. */
+			if (operation_size && data != next) {
+				DRM_ERROR("Inconsistent operation size\n");
+				return;
+			}
+		} else if (operation_size) {
+			/* We have size, skip. */
+			DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n",
+				      operation_byte);
+			data += operation_size;
+		} else {
+			/* No size, can't skip without parsing. */
+			DRM_ERROR("Unsupported MIPI operation byte %u\n",
+				  operation_byte);
+			return;
+		}
+	}
+}
+
+int intel_dsi_vbt_get_modes(struct intel_dsi *intel_dsi)
+{
+	struct intel_connector *connector = intel_dsi->attached_connector;
+	struct drm_device *dev = intel_dsi->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
+	if (!mode)
+		return 0;
+
+	mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+	drm_mode_probed_add(&connector->base, mode);
+
+	return 1;
+}
+
+bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
+{
+	struct drm_device *dev = intel_dsi->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
+	struct mipi_pps_data *pps = dev_priv->vbt.dsi.pps;
+	struct drm_display_mode *mode = dev_priv->vbt.lfp_lvds_vbt_mode;
+	u32 bpp;
+	u32 tlpx_ns, extra_byte_count, bitrate, tlpx_ui;
+	u32 ui_num, ui_den;
+	u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
+	u32 ths_prepare_ns, tclk_trail_ns;
+	u32 tclk_prepare_clkzero, ths_prepare_hszero;
+	u32 lp_to_hs_switch, hs_to_lp_switch;
+	u32 pclk, computed_ddr;
+	u32 mul;
+	u16 burst_mode_ratio;
+	enum port port;
+
+	DRM_DEBUG_KMS("\n");
+
+	intel_dsi->eotp_pkt = mipi_config->eot_pkt_disabled ? 0 : 1;
+	intel_dsi->clock_stop = mipi_config->enable_clk_stop ? 1 : 0;
+	intel_dsi->lane_count = mipi_config->lane_cnt + 1;
+	intel_dsi->pixel_format =
+			pixel_format_from_register_bits(
+				mipi_config->videomode_color_format << 7);
+	bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
+
+	intel_dsi->dual_link = mipi_config->dual_link;
+	intel_dsi->pixel_overlap = mipi_config->pixel_overlap;
+	intel_dsi->operation_mode = mipi_config->is_cmd_mode;
+	intel_dsi->video_mode_format = mipi_config->video_transfer_mode;
+	intel_dsi->escape_clk_div = mipi_config->byte_clk_sel;
+	intel_dsi->lp_rx_timeout = mipi_config->lp_rx_timeout;
+	intel_dsi->turn_arnd_val = mipi_config->turn_around_timeout;
+	intel_dsi->rst_timer_val = mipi_config->device_reset_timer;
+	intel_dsi->init_count = mipi_config->master_init_timer;
+	intel_dsi->bw_timer = mipi_config->dbi_bw_timer;
+	intel_dsi->video_frmt_cfg_bits =
+		mipi_config->bta_enabled ? DISABLE_VIDEO_BTA : 0;
+
+	pclk = mode->clock;
+
+	/* In dual link mode each port needs half of pixel clock */
+	if (intel_dsi->dual_link) {
+		pclk = pclk / 2;
+
+		/* we can enable pixel_overlap if needed by panel. In this
+		 * case we need to increase the pixelclock for extra pixels
+		 */
+		if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
+			pclk += DIV_ROUND_UP(mode->vtotal *
+						intel_dsi->pixel_overlap *
+						60, 1000);
+		}
+	}
+
+	/* Burst Mode Ratio
+	 * Target ddr frequency from VBT / non burst ddr freq
+	 * multiply by 100 to preserve remainder
+	 */
+	if (intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
+		if (mipi_config->target_burst_mode_freq) {
+			computed_ddr = (pclk * bpp) / intel_dsi->lane_count;
+
+			if (mipi_config->target_burst_mode_freq <
+								computed_ddr) {
+				DRM_ERROR("Burst mode freq is less than computed\n");
+				return false;
+			}
+
+			burst_mode_ratio = DIV_ROUND_UP(
+				mipi_config->target_burst_mode_freq * 100,
+				computed_ddr);
+
+			pclk = DIV_ROUND_UP(pclk * burst_mode_ratio, 100);
+		} else {
+			DRM_ERROR("Burst mode target is not set\n");
+			return false;
+		}
+	} else
+		burst_mode_ratio = 100;
+
+	intel_dsi->burst_mode_ratio = burst_mode_ratio;
+	intel_dsi->pclk = pclk;
+
+	bitrate = (pclk * bpp) / intel_dsi->lane_count;
+
+	switch (intel_dsi->escape_clk_div) {
+	case 0:
+		tlpx_ns = 50;
+		break;
+	case 1:
+		tlpx_ns = 100;
+		break;
+
+	case 2:
+		tlpx_ns = 200;
+		break;
+	default:
+		tlpx_ns = 50;
+		break;
+	}
+
+	switch (intel_dsi->lane_count) {
+	case 1:
+	case 2:
+		extra_byte_count = 2;
+		break;
+	case 3:
+		extra_byte_count = 4;
+		break;
+	case 4:
+	default:
+		extra_byte_count = 3;
+		break;
+	}
+
+	/* in Kbps */
+	ui_num = NS_KHZ_RATIO;
+	ui_den = bitrate;
+
+	tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
+	ths_prepare_hszero = mipi_config->ths_prepare_hszero;
+
+	/*
+	 * B060
+	 * LP byte clock = TLPX/ (8UI)
+	 */
+	intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
+
+	/* DDR clock period = 2 * UI
+	 * UI(sec) = 1/(bitrate * 10^3) (bitrate is in KHZ)
+	 * UI(nsec) = 10^6 / bitrate
+	 * DDR clock period (nsec) = 2 * UI = (2 * 10^6)/ bitrate
+	 * DDR clock count  = ns_value / DDR clock period
+	 *
+	 * For GEMINILAKE dphy_param_reg will be programmed in terms of
+	 * HS byte clock count for other platform in HS ddr clock count
+	 */
+	mul = IS_GEMINILAKE(dev_priv) ? 8 : 2;
+	ths_prepare_ns = max(mipi_config->ths_prepare,
+			     mipi_config->tclk_prepare);
+
+	/* prepare count */
+	prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
+
+	if (prepare_cnt > PREPARE_CNT_MAX) {
+		DRM_DEBUG_KMS("prepare count too high %u\n", prepare_cnt);
+		prepare_cnt = PREPARE_CNT_MAX;
+	}
+
+	/* exit zero count */
+	exit_zero_cnt = DIV_ROUND_UP(
+				(ths_prepare_hszero - ths_prepare_ns) * ui_den,
+				ui_num * mul
+				);
+
+	/*
+	 * Exit zero is unified val ths_zero and ths_exit
+	 * minimum value for ths_exit = 110ns
+	 * min (exit_zero_cnt * 2) = 110/UI
+	 * exit_zero_cnt = 55/UI
+	 */
+	if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num)
+		exit_zero_cnt += 1;
+
+	if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
+		DRM_DEBUG_KMS("exit zero count too high %u\n", exit_zero_cnt);
+		exit_zero_cnt = EXIT_ZERO_CNT_MAX;
+	}
+
+	/* clk zero count */
+	clk_zero_cnt = DIV_ROUND_UP(
+				(tclk_prepare_clkzero -	ths_prepare_ns)
+				* ui_den, ui_num * mul);
+
+	if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
+		DRM_DEBUG_KMS("clock zero count too high %u\n", clk_zero_cnt);
+		clk_zero_cnt = CLK_ZERO_CNT_MAX;
+	}
+
+	/* trail count */
+	tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
+	trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
+
+	if (trail_cnt > TRAIL_CNT_MAX) {
+		DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
+		trail_cnt = TRAIL_CNT_MAX;
+	}
+
+	/* B080 */
+	intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
+						clk_zero_cnt << 8 | prepare_cnt;
+
+	/*
+	 * LP to HS switch count = 4TLPX + PREP_COUNT * mul + EXIT_ZERO_COUNT *
+	 *					mul + 10UI + Extra Byte Count
+	 *
+	 * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count
+	 * Extra Byte Count is calculated according to number of lanes.
+	 * High Low Switch Count is the Max of LP to HS and
+	 * HS to LP switch count
+	 *
+	 */
+	tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
+
+	/* B044 */
+	/* FIXME:
+	 * The comment above does not match with the code */
+	lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * mul +
+						exit_zero_cnt * mul + 10, 8);
+
+	hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8);
+
+	intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
+	intel_dsi->hs_to_lp_count += extra_byte_count;
+
+	/* B088 */
+	/* LP -> HS for clock lanes
+	 * LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
+	 *						extra byte count
+	 * 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
+	 *					2(in UI) + extra byte count
+	 * In byteclks = (4TLPX + prepare_cnt * 2 + clk_zero_cnt *2 (in UI)) /
+	 *					8 + extra byte count
+	 */
+	intel_dsi->clk_lp_to_hs_count =
+		DIV_ROUND_UP(
+			4 * tlpx_ui + prepare_cnt * 2 +
+			clk_zero_cnt * 2,
+			8);
+
+	intel_dsi->clk_lp_to_hs_count += extra_byte_count;
+
+	/* HS->LP for Clock Lanes
+	 * Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
+	 *						Extra byte count
+	 * 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
+	 * In byteclks = (2*TLpx(in UI) + trail_count*2 +8)(in UI)/8 +
+	 *						Extra byte count
+	 */
+	intel_dsi->clk_hs_to_lp_count =
+		DIV_ROUND_UP(2 * tlpx_ui + trail_cnt * 2 + 8,
+			8);
+	intel_dsi->clk_hs_to_lp_count += extra_byte_count;
+
+	DRM_DEBUG_KMS("Pclk %d\n", intel_dsi->pclk);
+	DRM_DEBUG_KMS("Pixel overlap %d\n", intel_dsi->pixel_overlap);
+	DRM_DEBUG_KMS("Lane count %d\n", intel_dsi->lane_count);
+	DRM_DEBUG_KMS("DPHY param reg 0x%x\n", intel_dsi->dphy_reg);
+	DRM_DEBUG_KMS("Video mode format %s\n",
+		      intel_dsi->video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE ?
+		      "non-burst with sync pulse" :
+		      intel_dsi->video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS ?
+		      "non-burst with sync events" :
+		      intel_dsi->video_mode_format == VIDEO_MODE_BURST ?
+		      "burst" : "<unknown>");
+	DRM_DEBUG_KMS("Burst mode ratio %d\n", intel_dsi->burst_mode_ratio);
+	DRM_DEBUG_KMS("Reset timer %d\n", intel_dsi->rst_timer_val);
+	DRM_DEBUG_KMS("Eot %s\n", enableddisabled(intel_dsi->eotp_pkt));
+	DRM_DEBUG_KMS("Clockstop %s\n", enableddisabled(!intel_dsi->clock_stop));
+	DRM_DEBUG_KMS("Mode %s\n", intel_dsi->operation_mode ? "command" : "video");
+	if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
+		DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_FRONT_BACK\n");
+	else if (intel_dsi->dual_link == DSI_DUAL_LINK_PIXEL_ALT)
+		DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_PIXEL_ALT\n");
+	else
+		DRM_DEBUG_KMS("Dual link: NONE\n");
+	DRM_DEBUG_KMS("Pixel Format %d\n", intel_dsi->pixel_format);
+	DRM_DEBUG_KMS("TLPX %d\n", intel_dsi->escape_clk_div);
+	DRM_DEBUG_KMS("LP RX Timeout 0x%x\n", intel_dsi->lp_rx_timeout);
+	DRM_DEBUG_KMS("Turnaround Timeout 0x%x\n", intel_dsi->turn_arnd_val);
+	DRM_DEBUG_KMS("Init Count 0x%x\n", intel_dsi->init_count);
+	DRM_DEBUG_KMS("HS to LP Count 0x%x\n", intel_dsi->hs_to_lp_count);
+	DRM_DEBUG_KMS("LP Byte Clock %d\n", intel_dsi->lp_byte_clk);
+	DRM_DEBUG_KMS("DBI BW Timer 0x%x\n", intel_dsi->bw_timer);
+	DRM_DEBUG_KMS("LP to HS Clock Count 0x%x\n", intel_dsi->clk_lp_to_hs_count);
+	DRM_DEBUG_KMS("HS to LP Clock Count 0x%x\n", intel_dsi->clk_hs_to_lp_count);
+	DRM_DEBUG_KMS("BTA %s\n",
+			enableddisabled(!(intel_dsi->video_frmt_cfg_bits & DISABLE_VIDEO_BTA)));
+
+	/* delays in VBT are in unit of 100us, so need to convert
+	 * here in ms
+	 * Delay (100us) * 100 /1000 = Delay / 10 (ms) */
+	intel_dsi->backlight_off_delay = pps->bl_disable_delay / 10;
+	intel_dsi->backlight_on_delay = pps->bl_enable_delay / 10;
+	intel_dsi->panel_on_delay = pps->panel_on_delay / 10;
+	intel_dsi->panel_off_delay = pps->panel_off_delay / 10;
+	intel_dsi->panel_pwr_cycle_delay = pps->panel_power_cycle_delay / 10;
+
+	/* a regular driver would get the device in probe */
+	for_each_dsi_port(port, intel_dsi->ports) {
+		mipi_dsi_attach(intel_dsi->dsi_hosts[port]->device);
+	}
+
+	return true;
+}