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  1. /*
  2.  * Copyright © 2014 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  *
  23.  * Author: Shobhit Kumar <shobhit.kumar@intel.com>
  24.  *
  25.  */
  26.  
  27. #include <drm/drmP.h>
  28. #include <drm/drm_crtc.h>
  29. #include <drm/drm_edid.h>
  30. #include <drm/i915_drm.h>
  31. #include <drm/drm_panel.h>
  32. #include <linux/slab.h>
  33. #include <video/mipi_display.h>
  34. #include <asm/intel-mid.h>
  35. #include <video/mipi_display.h>
  36. #include "i915_drv.h"
  37. #include "intel_drv.h"
  38. #include "intel_dsi.h"
  39.  
  40. struct vbt_panel {
  41.         struct drm_panel panel;
  42.         struct intel_dsi *intel_dsi;
  43. };
  44.  
  45. static inline struct vbt_panel *to_vbt_panel(struct drm_panel *panel)
  46. {
  47.         return container_of(panel, struct vbt_panel, panel);
  48. }
  49.  
  50. #define MIPI_TRANSFER_MODE_SHIFT        0
  51. #define MIPI_VIRTUAL_CHANNEL_SHIFT      1
  52. #define MIPI_PORT_SHIFT                 3
  53.  
  54. #define PREPARE_CNT_MAX         0x3F
  55. #define EXIT_ZERO_CNT_MAX       0x3F
  56. #define CLK_ZERO_CNT_MAX        0xFF
  57. #define TRAIL_CNT_MAX           0x1F
  58.  
  59. #define NS_KHZ_RATIO 1000000
  60.  
  61. #define GPI0_NC_0_HV_DDI0_HPD           0x4130
  62. #define GPIO_NC_0_HV_DDI0_PAD           0x4138
  63. #define GPIO_NC_1_HV_DDI0_DDC_SDA       0x4120
  64. #define GPIO_NC_1_HV_DDI0_DDC_SDA_PAD   0x4128
  65. #define GPIO_NC_2_HV_DDI0_DDC_SCL       0x4110
  66. #define GPIO_NC_2_HV_DDI0_DDC_SCL_PAD   0x4118
  67. #define GPIO_NC_3_PANEL0_VDDEN          0x4140
  68. #define GPIO_NC_3_PANEL0_VDDEN_PAD      0x4148
  69. #define GPIO_NC_4_PANEL0_BLKEN          0x4150
  70. #define GPIO_NC_4_PANEL0_BLKEN_PAD      0x4158
  71. #define GPIO_NC_5_PANEL0_BLKCTL         0x4160
  72. #define GPIO_NC_5_PANEL0_BLKCTL_PAD     0x4168
  73. #define GPIO_NC_6_PCONF0                0x4180
  74. #define GPIO_NC_6_PAD                   0x4188
  75. #define GPIO_NC_7_PCONF0                0x4190
  76. #define GPIO_NC_7_PAD                   0x4198
  77. #define GPIO_NC_8_PCONF0                0x4170
  78. #define GPIO_NC_8_PAD                   0x4178
  79. #define GPIO_NC_9_PCONF0                0x4100
  80. #define GPIO_NC_9_PAD                   0x4108
  81. #define GPIO_NC_10_PCONF0               0x40E0
  82. #define GPIO_NC_10_PAD                  0x40E8
  83. #define GPIO_NC_11_PCONF0               0x40F0
  84. #define GPIO_NC_11_PAD                  0x40F8
  85.  
  86. struct gpio_table {
  87.         u16 function_reg;
  88.         u16 pad_reg;
  89.         u8 init;
  90. };
  91.  
  92. static struct gpio_table gtable[] = {
  93.         { GPI0_NC_0_HV_DDI0_HPD, GPIO_NC_0_HV_DDI0_PAD, 0 },
  94.         { GPIO_NC_1_HV_DDI0_DDC_SDA, GPIO_NC_1_HV_DDI0_DDC_SDA_PAD, 0 },
  95.         { GPIO_NC_2_HV_DDI0_DDC_SCL, GPIO_NC_2_HV_DDI0_DDC_SCL_PAD, 0 },
  96.         { GPIO_NC_3_PANEL0_VDDEN, GPIO_NC_3_PANEL0_VDDEN_PAD, 0 },
  97.         { GPIO_NC_4_PANEL0_BLKEN, GPIO_NC_4_PANEL0_BLKEN_PAD, 0 },
  98.         { GPIO_NC_5_PANEL0_BLKCTL, GPIO_NC_5_PANEL0_BLKCTL_PAD, 0 },
  99.         { GPIO_NC_6_PCONF0, GPIO_NC_6_PAD, 0 },
  100.         { GPIO_NC_7_PCONF0, GPIO_NC_7_PAD, 0 },
  101.         { GPIO_NC_8_PCONF0, GPIO_NC_8_PAD, 0 },
  102.         { GPIO_NC_9_PCONF0, GPIO_NC_9_PAD, 0 },
  103.         { GPIO_NC_10_PCONF0, GPIO_NC_10_PAD, 0},
  104.         { GPIO_NC_11_PCONF0, GPIO_NC_11_PAD, 0}
  105. };
  106.  
  107. static inline enum port intel_dsi_seq_port_to_port(u8 port)
  108. {
  109.         return port ? PORT_C : PORT_A;
  110. }
  111.  
  112. static const u8 *mipi_exec_send_packet(struct intel_dsi *intel_dsi,
  113.                                        const u8 *data)
  114. {
  115.         struct mipi_dsi_device *dsi_device;
  116.         u8 type, flags, seq_port;
  117.         u16 len;
  118.         enum port port;
  119.  
  120.         flags = *data++;
  121.         type = *data++;
  122.  
  123.         len = *((u16 *) data);
  124.         data += 2;
  125.  
  126.         seq_port = (flags >> MIPI_PORT_SHIFT) & 3;
  127.  
  128.         /* For DSI single link on Port A & C, the seq_port value which is
  129.          * parsed from Sequence Block#53 of VBT has been set to 0
  130.          * Now, read/write of packets for the DSI single link on Port A and
  131.          * Port C will based on the DVO port from VBT block 2.
  132.          */
  133.         if (intel_dsi->ports == (1 << PORT_C))
  134.                 port = PORT_C;
  135.         else
  136.                 port = intel_dsi_seq_port_to_port(seq_port);
  137.  
  138.         dsi_device = intel_dsi->dsi_hosts[port]->device;
  139.         if (!dsi_device) {
  140.                 DRM_DEBUG_KMS("no dsi device for port %c\n", port_name(port));
  141.                 goto out;
  142.         }
  143.  
  144.         if ((flags >> MIPI_TRANSFER_MODE_SHIFT) & 1)
  145.                 dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
  146.         else
  147.                 dsi_device->mode_flags |= MIPI_DSI_MODE_LPM;
  148.  
  149.         dsi_device->channel = (flags >> MIPI_VIRTUAL_CHANNEL_SHIFT) & 3;
  150.  
  151.         switch (type) {
  152.         case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
  153.                 mipi_dsi_generic_write(dsi_device, NULL, 0);
  154.                 break;
  155.         case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
  156.                 mipi_dsi_generic_write(dsi_device, data, 1);
  157.                 break;
  158.         case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
  159.                 mipi_dsi_generic_write(dsi_device, data, 2);
  160.                 break;
  161.         case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
  162.         case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
  163.         case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
  164.                 DRM_DEBUG_DRIVER("Generic Read not yet implemented or used\n");
  165.                 break;
  166.         case MIPI_DSI_GENERIC_LONG_WRITE:
  167.                 mipi_dsi_generic_write(dsi_device, data, len);
  168.                 break;
  169.         case MIPI_DSI_DCS_SHORT_WRITE:
  170.                 mipi_dsi_dcs_write_buffer(dsi_device, data, 1);
  171.                 break;
  172.         case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
  173.                 mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
  174.                 break;
  175.         case MIPI_DSI_DCS_READ:
  176.                 DRM_DEBUG_DRIVER("DCS Read not yet implemented or used\n");
  177.                 break;
  178.         case MIPI_DSI_DCS_LONG_WRITE:
  179.                 mipi_dsi_dcs_write_buffer(dsi_device, data, len);
  180.                 break;
  181.         }
  182.  
  183. out:
  184.         data += len;
  185.  
  186.         return data;
  187. }
  188.  
  189. static const u8 *mipi_exec_delay(struct intel_dsi *intel_dsi, const u8 *data)
  190. {
  191.         u32 delay = *((const u32 *) data);
  192.  
  193.         usleep_range(delay, delay + 10);
  194.         data += 4;
  195.  
  196.         return data;
  197. }
  198.  
  199. static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
  200. {
  201.         u8 gpio, action;
  202.         u16 function, pad;
  203.         u32 val;
  204.         struct drm_device *dev = intel_dsi->base.base.dev;
  205.         struct drm_i915_private *dev_priv = dev->dev_private;
  206.  
  207.         if (dev_priv->vbt.dsi.seq_version >= 3)
  208.                 data++;
  209.  
  210.         gpio = *data++;
  211.  
  212.         /* pull up/down */
  213.         action = *data++ & 1;
  214.  
  215.         if (gpio >= ARRAY_SIZE(gtable)) {
  216.                 DRM_DEBUG_KMS("unknown gpio %u\n", gpio);
  217.                 goto out;
  218.         }
  219.  
  220.         if (!IS_VALLEYVIEW(dev_priv)) {
  221.                 DRM_DEBUG_KMS("GPIO element not supported on this platform\n");
  222.                 goto out;
  223.         }
  224.  
  225.         if (dev_priv->vbt.dsi.seq_version >= 3) {
  226.                 DRM_DEBUG_KMS("GPIO element v3 not supported\n");
  227.                 goto out;
  228.         }
  229.  
  230.         function = gtable[gpio].function_reg;
  231.         pad = gtable[gpio].pad_reg;
  232.  
  233.         mutex_lock(&dev_priv->sb_lock);
  234.         if (!gtable[gpio].init) {
  235.                 /* program the function */
  236.                 /* FIXME: remove constant below */
  237.                 vlv_iosf_sb_write(dev_priv, IOSF_PORT_GPIO_NC, function,
  238.                                   0x2000CC00);
  239.                 gtable[gpio].init = 1;
  240.         }
  241.  
  242.         val = 0x4 | action;
  243.  
  244.         /* pull up/down */
  245.         vlv_iosf_sb_write(dev_priv, IOSF_PORT_GPIO_NC, pad, val);
  246.         mutex_unlock(&dev_priv->sb_lock);
  247.  
  248. out:
  249.         return data;
  250. }
  251.  
  252. static const u8 *mipi_exec_i2c_skip(struct intel_dsi *intel_dsi, const u8 *data)
  253. {
  254.         return data + *(data + 6) + 7;
  255. }
  256.  
  257. typedef const u8 * (*fn_mipi_elem_exec)(struct intel_dsi *intel_dsi,
  258.                                         const u8 *data);
  259. static const fn_mipi_elem_exec exec_elem[] = {
  260.         [MIPI_SEQ_ELEM_SEND_PKT] = mipi_exec_send_packet,
  261.         [MIPI_SEQ_ELEM_DELAY] = mipi_exec_delay,
  262.         [MIPI_SEQ_ELEM_GPIO] = mipi_exec_gpio,
  263.         [MIPI_SEQ_ELEM_I2C] = mipi_exec_i2c_skip,
  264. };
  265.  
  266. /*
  267.  * MIPI Sequence from VBT #53 parsing logic
  268.  * We have already separated each seqence during bios parsing
  269.  * Following is generic execution function for any sequence
  270.  */
  271.  
  272. static const char * const seq_name[] = {
  273.         [MIPI_SEQ_ASSERT_RESET] = "MIPI_SEQ_ASSERT_RESET",
  274.         [MIPI_SEQ_INIT_OTP] = "MIPI_SEQ_INIT_OTP",
  275.         [MIPI_SEQ_DISPLAY_ON] = "MIPI_SEQ_DISPLAY_ON",
  276.         [MIPI_SEQ_DISPLAY_OFF]  = "MIPI_SEQ_DISPLAY_OFF",
  277.         [MIPI_SEQ_DEASSERT_RESET] = "MIPI_SEQ_DEASSERT_RESET",
  278.         [MIPI_SEQ_BACKLIGHT_ON] = "MIPI_SEQ_BACKLIGHT_ON",
  279.         [MIPI_SEQ_BACKLIGHT_OFF] = "MIPI_SEQ_BACKLIGHT_OFF",
  280.         [MIPI_SEQ_TEAR_ON] = "MIPI_SEQ_TEAR_ON",
  281.         [MIPI_SEQ_TEAR_OFF] = "MIPI_SEQ_TEAR_OFF",
  282.         [MIPI_SEQ_POWER_ON] = "MIPI_SEQ_POWER_ON",
  283.         [MIPI_SEQ_POWER_OFF] = "MIPI_SEQ_POWER_OFF",
  284. };
  285.  
  286. static const char *sequence_name(enum mipi_seq seq_id)
  287. {
  288.         if (seq_id < ARRAY_SIZE(seq_name) && seq_name[seq_id])
  289.                 return seq_name[seq_id];
  290.         else
  291.                 return "(unknown)";
  292. }
  293.  
  294. static void generic_exec_sequence(struct drm_panel *panel, enum mipi_seq seq_id)
  295. {
  296.         struct vbt_panel *vbt_panel = to_vbt_panel(panel);
  297.         struct intel_dsi *intel_dsi = vbt_panel->intel_dsi;
  298.         struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
  299.         const u8 *data;
  300.         fn_mipi_elem_exec mipi_elem_exec;
  301.  
  302.         if (WARN_ON(seq_id >= ARRAY_SIZE(dev_priv->vbt.dsi.sequence)))
  303.                 return;
  304.  
  305.         data = dev_priv->vbt.dsi.sequence[seq_id];
  306.         if (!data) {
  307.                 DRM_DEBUG_KMS("MIPI sequence %d - %s not available\n",
  308.                               seq_id, sequence_name(seq_id));
  309.                 return;
  310.         }
  311.  
  312.         WARN_ON(*data != seq_id);
  313.  
  314.         DRM_DEBUG_KMS("Starting MIPI sequence %d - %s\n",
  315.                       seq_id, sequence_name(seq_id));
  316.  
  317.         /* Skip Sequence Byte. */
  318.         data++;
  319.  
  320.         /* Skip Size of Sequence. */
  321.         if (dev_priv->vbt.dsi.seq_version >= 3)
  322.                 data += 4;
  323.  
  324.         while (1) {
  325.                 u8 operation_byte = *data++;
  326.                 u8 operation_size = 0;
  327.  
  328.                 if (operation_byte == MIPI_SEQ_ELEM_END)
  329.                         break;
  330.  
  331.                 if (operation_byte < ARRAY_SIZE(exec_elem))
  332.                         mipi_elem_exec = exec_elem[operation_byte];
  333.                 else
  334.                         mipi_elem_exec = NULL;
  335.  
  336.                 /* Size of Operation. */
  337.                 if (dev_priv->vbt.dsi.seq_version >= 3)
  338.                         operation_size = *data++;
  339.  
  340.                 if (mipi_elem_exec) {
  341.                         data = mipi_elem_exec(intel_dsi, data);
  342.                 } else if (operation_size) {
  343.                         /* We have size, skip. */
  344.                         DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n",
  345.                                       operation_byte);
  346.                         data += operation_size;
  347.                 } else {
  348.                         /* No size, can't skip without parsing. */
  349.                         DRM_ERROR("Unsupported MIPI operation byte %u\n",
  350.                                   operation_byte);
  351.                         return;
  352.                 }
  353.         }
  354. }
  355.  
  356. static int vbt_panel_prepare(struct drm_panel *panel)
  357. {
  358.         generic_exec_sequence(panel, MIPI_SEQ_ASSERT_RESET);
  359.         generic_exec_sequence(panel, MIPI_SEQ_INIT_OTP);
  360.  
  361.         return 0;
  362. }
  363.  
  364. static int vbt_panel_unprepare(struct drm_panel *panel)
  365. {
  366.         generic_exec_sequence(panel, MIPI_SEQ_DEASSERT_RESET);
  367.  
  368.         return 0;
  369. }
  370.  
  371. static int vbt_panel_enable(struct drm_panel *panel)
  372. {
  373.         generic_exec_sequence(panel, MIPI_SEQ_DISPLAY_ON);
  374.  
  375.         return 0;
  376. }
  377.  
  378. static int vbt_panel_disable(struct drm_panel *panel)
  379. {
  380.         generic_exec_sequence(panel, MIPI_SEQ_DISPLAY_OFF);
  381.  
  382.         return 0;
  383. }
  384.  
  385. static int vbt_panel_get_modes(struct drm_panel *panel)
  386. {
  387.         struct vbt_panel *vbt_panel = to_vbt_panel(panel);
  388.         struct intel_dsi *intel_dsi = vbt_panel->intel_dsi;
  389.         struct drm_device *dev = intel_dsi->base.base.dev;
  390.         struct drm_i915_private *dev_priv = dev->dev_private;
  391.         struct drm_display_mode *mode;
  392.  
  393.         if (!panel->connector)
  394.                 return 0;
  395.  
  396.         mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
  397.         if (!mode)
  398.                 return 0;
  399.  
  400.         mode->type |= DRM_MODE_TYPE_PREFERRED;
  401.  
  402.         drm_mode_probed_add(panel->connector, mode);
  403.  
  404.         return 1;
  405. }
  406.  
  407. static const struct drm_panel_funcs vbt_panel_funcs = {
  408.         .disable = vbt_panel_disable,
  409.         .unprepare = vbt_panel_unprepare,
  410.         .prepare = vbt_panel_prepare,
  411.         .enable = vbt_panel_enable,
  412.         .get_modes = vbt_panel_get_modes,
  413. };
  414.  
  415. struct drm_panel *vbt_panel_init(struct intel_dsi *intel_dsi, u16 panel_id)
  416. {
  417.         struct drm_device *dev = intel_dsi->base.base.dev;
  418.         struct drm_i915_private *dev_priv = dev->dev_private;
  419.         struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
  420.         struct mipi_pps_data *pps = dev_priv->vbt.dsi.pps;
  421.         struct drm_display_mode *mode = dev_priv->vbt.lfp_lvds_vbt_mode;
  422.         struct vbt_panel *vbt_panel;
  423.         u32 bits_per_pixel = 24;
  424.         u32 tlpx_ns, extra_byte_count, bitrate, tlpx_ui;
  425.         u32 ui_num, ui_den;
  426.         u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
  427.         u32 ths_prepare_ns, tclk_trail_ns;
  428.         u32 tclk_prepare_clkzero, ths_prepare_hszero;
  429.         u32 lp_to_hs_switch, hs_to_lp_switch;
  430.         u32 pclk, computed_ddr;
  431.         u16 burst_mode_ratio;
  432.         enum port port;
  433.  
  434.         DRM_DEBUG_KMS("\n");
  435.  
  436.         intel_dsi->eotp_pkt = mipi_config->eot_pkt_disabled ? 0 : 1;
  437.         intel_dsi->clock_stop = mipi_config->enable_clk_stop ? 1 : 0;
  438.         intel_dsi->lane_count = mipi_config->lane_cnt + 1;
  439.         intel_dsi->pixel_format = mipi_config->videomode_color_format << 7;
  440.         intel_dsi->dual_link = mipi_config->dual_link;
  441.         intel_dsi->pixel_overlap = mipi_config->pixel_overlap;
  442.  
  443.         bits_per_pixel = dsi_pixel_format_bpp(intel_dsi->pixel_format);
  444.  
  445.         intel_dsi->operation_mode = mipi_config->is_cmd_mode;
  446.         intel_dsi->video_mode_format = mipi_config->video_transfer_mode;
  447.         intel_dsi->escape_clk_div = mipi_config->byte_clk_sel;
  448.         intel_dsi->lp_rx_timeout = mipi_config->lp_rx_timeout;
  449.         intel_dsi->turn_arnd_val = mipi_config->turn_around_timeout;
  450.         intel_dsi->rst_timer_val = mipi_config->device_reset_timer;
  451.         intel_dsi->init_count = mipi_config->master_init_timer;
  452.         intel_dsi->bw_timer = mipi_config->dbi_bw_timer;
  453.         intel_dsi->video_frmt_cfg_bits =
  454.                 mipi_config->bta_enabled ? DISABLE_VIDEO_BTA : 0;
  455.  
  456.         pclk = mode->clock;
  457.  
  458.         /* In dual link mode each port needs half of pixel clock */
  459.         if (intel_dsi->dual_link) {
  460.                 pclk = pclk / 2;
  461.  
  462.                 /* we can enable pixel_overlap if needed by panel. In this
  463.                  * case we need to increase the pixelclock for extra pixels
  464.                  */
  465.                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
  466.                         pclk += DIV_ROUND_UP(mode->vtotal *
  467.                                                 intel_dsi->pixel_overlap *
  468.                                                 60, 1000);
  469.                 }
  470.         }
  471.  
  472.         /* Burst Mode Ratio
  473.          * Target ddr frequency from VBT / non burst ddr freq
  474.          * multiply by 100 to preserve remainder
  475.          */
  476.         if (intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
  477.                 if (mipi_config->target_burst_mode_freq) {
  478.                         computed_ddr =
  479.                                 (pclk * bits_per_pixel) / intel_dsi->lane_count;
  480.  
  481.                         if (mipi_config->target_burst_mode_freq <
  482.                                                                 computed_ddr) {
  483.                                 DRM_ERROR("Burst mode freq is less than computed\n");
  484.                                 return NULL;
  485.                         }
  486.  
  487.                         burst_mode_ratio = DIV_ROUND_UP(
  488.                                 mipi_config->target_burst_mode_freq * 100,
  489.                                 computed_ddr);
  490.  
  491.                         pclk = DIV_ROUND_UP(pclk * burst_mode_ratio, 100);
  492.                 } else {
  493.                         DRM_ERROR("Burst mode target is not set\n");
  494.                         return NULL;
  495.                 }
  496.         } else
  497.                 burst_mode_ratio = 100;
  498.  
  499.         intel_dsi->burst_mode_ratio = burst_mode_ratio;
  500.         intel_dsi->pclk = pclk;
  501.  
  502.         bitrate = (pclk * bits_per_pixel) / intel_dsi->lane_count;
  503.  
  504.         switch (intel_dsi->escape_clk_div) {
  505.         case 0:
  506.                 tlpx_ns = 50;
  507.                 break;
  508.         case 1:
  509.                 tlpx_ns = 100;
  510.                 break;
  511.  
  512.         case 2:
  513.                 tlpx_ns = 200;
  514.                 break;
  515.         default:
  516.                 tlpx_ns = 50;
  517.                 break;
  518.         }
  519.  
  520.         switch (intel_dsi->lane_count) {
  521.         case 1:
  522.         case 2:
  523.                 extra_byte_count = 2;
  524.                 break;
  525.         case 3:
  526.                 extra_byte_count = 4;
  527.                 break;
  528.         case 4:
  529.         default:
  530.                 extra_byte_count = 3;
  531.                 break;
  532.         }
  533.  
  534.         /*
  535.          * ui(s) = 1/f [f in hz]
  536.          * ui(ns) = 10^9 / (f*10^6) [f in Mhz] -> 10^3/f(Mhz)
  537.          */
  538.  
  539.         /* in Kbps */
  540.         ui_num = NS_KHZ_RATIO;
  541.         ui_den = bitrate;
  542.  
  543.         tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
  544.         ths_prepare_hszero = mipi_config->ths_prepare_hszero;
  545.  
  546.         /*
  547.          * B060
  548.          * LP byte clock = TLPX/ (8UI)
  549.          */
  550.         intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
  551.  
  552.         /* count values in UI = (ns value) * (bitrate / (2 * 10^6))
  553.          *
  554.          * Since txddrclkhs_i is 2xUI, all the count values programmed in
  555.          * DPHY param register are divided by 2
  556.          *
  557.          * prepare count
  558.          */
  559.         ths_prepare_ns = max(mipi_config->ths_prepare,
  560.                              mipi_config->tclk_prepare);
  561.         prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * 2);
  562.  
  563.         /* exit zero count */
  564.         exit_zero_cnt = DIV_ROUND_UP(
  565.                                 (ths_prepare_hszero - ths_prepare_ns) * ui_den,
  566.                                 ui_num * 2
  567.                                 );
  568.  
  569.         /*
  570.          * Exit zero  is unified val ths_zero and ths_exit
  571.          * minimum value for ths_exit = 110ns
  572.          * min (exit_zero_cnt * 2) = 110/UI
  573.          * exit_zero_cnt = 55/UI
  574.          */
  575.          if (exit_zero_cnt < (55 * ui_den / ui_num))
  576.                 if ((55 * ui_den) % ui_num)
  577.                         exit_zero_cnt += 1;
  578.  
  579.         /* clk zero count */
  580.         clk_zero_cnt = DIV_ROUND_UP(
  581.                         (tclk_prepare_clkzero - ths_prepare_ns)
  582.                         * ui_den, 2 * ui_num);
  583.  
  584.         /* trail count */
  585.         tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
  586.         trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, 2 * ui_num);
  587.  
  588.         if (prepare_cnt > PREPARE_CNT_MAX ||
  589.                 exit_zero_cnt > EXIT_ZERO_CNT_MAX ||
  590.                 clk_zero_cnt > CLK_ZERO_CNT_MAX ||
  591.                 trail_cnt > TRAIL_CNT_MAX)
  592.                 DRM_DEBUG_DRIVER("Values crossing maximum limits, restricting to max values\n");
  593.  
  594.         if (prepare_cnt > PREPARE_CNT_MAX)
  595.                 prepare_cnt = PREPARE_CNT_MAX;
  596.  
  597.         if (exit_zero_cnt > EXIT_ZERO_CNT_MAX)
  598.                 exit_zero_cnt = EXIT_ZERO_CNT_MAX;
  599.  
  600.         if (clk_zero_cnt > CLK_ZERO_CNT_MAX)
  601.                 clk_zero_cnt = CLK_ZERO_CNT_MAX;
  602.  
  603.         if (trail_cnt > TRAIL_CNT_MAX)
  604.                 trail_cnt = TRAIL_CNT_MAX;
  605.  
  606.         /* B080 */
  607.         intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
  608.                                                 clk_zero_cnt << 8 | prepare_cnt;
  609.  
  610.         /*
  611.          * LP to HS switch count = 4TLPX + PREP_COUNT * 2 + EXIT_ZERO_COUNT * 2
  612.          *                                      + 10UI + Extra Byte Count
  613.          *
  614.          * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count
  615.          * Extra Byte Count is calculated according to number of lanes.
  616.          * High Low Switch Count is the Max of LP to HS and
  617.          * HS to LP switch count
  618.          *
  619.          */
  620.         tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
  621.  
  622.         /* B044 */
  623.         /* FIXME:
  624.          * The comment above does not match with the code */
  625.         lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * 2 +
  626.                                                 exit_zero_cnt * 2 + 10, 8);
  627.  
  628.         hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8);
  629.  
  630.         intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
  631.         intel_dsi->hs_to_lp_count += extra_byte_count;
  632.  
  633.         /* B088 */
  634.         /* LP -> HS for clock lanes
  635.          * LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
  636.          *                                              extra byte count
  637.          * 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
  638.          *                                      2(in UI) + extra byte count
  639.          * In byteclks = (4TLPX + prepare_cnt * 2 + clk_zero_cnt *2 (in UI)) /
  640.          *                                      8 + extra byte count
  641.          */
  642.         intel_dsi->clk_lp_to_hs_count =
  643.                 DIV_ROUND_UP(
  644.                         4 * tlpx_ui + prepare_cnt * 2 +
  645.                         clk_zero_cnt * 2,
  646.                         8);
  647.  
  648.         intel_dsi->clk_lp_to_hs_count += extra_byte_count;
  649.  
  650.         /* HS->LP for Clock Lanes
  651.          * Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
  652.          *                                              Extra byte count
  653.          * 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
  654.          * In byteclks = (2*TLpx(in UI) + trail_count*2 +8)(in UI)/8 +
  655.          *                                              Extra byte count
  656.          */
  657.         intel_dsi->clk_hs_to_lp_count =
  658.                 DIV_ROUND_UP(2 * tlpx_ui + trail_cnt * 2 + 8,
  659.                         8);
  660.         intel_dsi->clk_hs_to_lp_count += extra_byte_count;
  661.  
  662.         DRM_DEBUG_KMS("Eot %s\n", intel_dsi->eotp_pkt ? "enabled" : "disabled");
  663.         DRM_DEBUG_KMS("Clockstop %s\n", intel_dsi->clock_stop ?
  664.                                                 "disabled" : "enabled");
  665.         DRM_DEBUG_KMS("Mode %s\n", intel_dsi->operation_mode ? "command" : "video");
  666.         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
  667.                 DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_FRONT_BACK\n");
  668.         else if (intel_dsi->dual_link == DSI_DUAL_LINK_PIXEL_ALT)
  669.                 DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_PIXEL_ALT\n");
  670.         else
  671.                 DRM_DEBUG_KMS("Dual link: NONE\n");
  672.         DRM_DEBUG_KMS("Pixel Format %d\n", intel_dsi->pixel_format);
  673.         DRM_DEBUG_KMS("TLPX %d\n", intel_dsi->escape_clk_div);
  674.         DRM_DEBUG_KMS("LP RX Timeout 0x%x\n", intel_dsi->lp_rx_timeout);
  675.         DRM_DEBUG_KMS("Turnaround Timeout 0x%x\n", intel_dsi->turn_arnd_val);
  676.         DRM_DEBUG_KMS("Init Count 0x%x\n", intel_dsi->init_count);
  677.         DRM_DEBUG_KMS("HS to LP Count 0x%x\n", intel_dsi->hs_to_lp_count);
  678.         DRM_DEBUG_KMS("LP Byte Clock %d\n", intel_dsi->lp_byte_clk);
  679.         DRM_DEBUG_KMS("DBI BW Timer 0x%x\n", intel_dsi->bw_timer);
  680.         DRM_DEBUG_KMS("LP to HS Clock Count 0x%x\n", intel_dsi->clk_lp_to_hs_count);
  681.         DRM_DEBUG_KMS("HS to LP Clock Count 0x%x\n", intel_dsi->clk_hs_to_lp_count);
  682.         DRM_DEBUG_KMS("BTA %s\n",
  683.                         intel_dsi->video_frmt_cfg_bits & DISABLE_VIDEO_BTA ?
  684.                         "disabled" : "enabled");
  685.  
  686.         /* delays in VBT are in unit of 100us, so need to convert
  687.          * here in ms
  688.          * Delay (100us) * 100 /1000 = Delay / 10 (ms) */
  689.         intel_dsi->backlight_off_delay = pps->bl_disable_delay / 10;
  690.         intel_dsi->backlight_on_delay = pps->bl_enable_delay / 10;
  691.         intel_dsi->panel_on_delay = pps->panel_on_delay / 10;
  692.         intel_dsi->panel_off_delay = pps->panel_off_delay / 10;
  693.         intel_dsi->panel_pwr_cycle_delay = pps->panel_power_cycle_delay / 10;
  694.  
  695.         /* This is cheating a bit with the cleanup. */
  696.     vbt_panel = kzalloc(sizeof(*vbt_panel), GFP_KERNEL);
  697.         if (!vbt_panel)
  698.                 return NULL;
  699.  
  700.         vbt_panel->intel_dsi = intel_dsi;
  701.         drm_panel_init(&vbt_panel->panel);
  702.         vbt_panel->panel.funcs = &vbt_panel_funcs;
  703.         drm_panel_add(&vbt_panel->panel);
  704.  
  705.         /* a regular driver would get the device in probe */
  706.         for_each_dsi_port(port, intel_dsi->ports) {
  707.                 mipi_dsi_attach(intel_dsi->dsi_hosts[port]->device);
  708.         }
  709.  
  710.         return &vbt_panel->panel;
  711. }
  712.