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  1. /*
  2.  * Copyright 2006 Dave Airlie <airlied@linux.ie>
  3.  * Copyright © 2006-2007 Intel Corporation
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  9.  * and/or sell copies of the Software, and to permit persons to whom the
  10.  * Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the next
  13.  * paragraph) shall be included in all copies or substantial portions of the
  14.  * Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  * DEALINGS IN THE SOFTWARE.
  23.  *
  24.  * Authors:
  25.  *      Eric Anholt <eric@anholt.net>
  26.  */
  27. #include <linux/i2c.h>
  28. #include <linux/slab.h>
  29. #include "drmP.h"
  30. #include "drm.h"
  31. #include "drm_crtc.h"
  32. #include "intel_drv.h"
  33. #include "i915_drm.h"
  34. #include "i915_drv.h"
  35. #include "dvo.h"
  36.  
  37. #define SIL164_ADDR     0x38
  38. #define CH7xxx_ADDR     0x76
  39. #define TFP410_ADDR     0x38
  40.  
  41. static const struct intel_dvo_device intel_dvo_devices[] = {
  42.         {
  43.                 .type = INTEL_DVO_CHIP_TMDS,
  44.                 .name = "sil164",
  45.                 .dvo_reg = DVOC,
  46.                 .slave_addr = SIL164_ADDR,
  47.                 .dev_ops = &sil164_ops,
  48.         },
  49.         {
  50.                 .type = INTEL_DVO_CHIP_TMDS,
  51.                 .name = "ch7xxx",
  52.                 .dvo_reg = DVOC,
  53.                 .slave_addr = CH7xxx_ADDR,
  54.                 .dev_ops = &ch7xxx_ops,
  55.         },
  56.         {
  57.                 .type = INTEL_DVO_CHIP_LVDS,
  58.                 .name = "ivch",
  59.                 .dvo_reg = DVOA,
  60.                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  61.                 .dev_ops = &ivch_ops,
  62.         },
  63.         {
  64.                 .type = INTEL_DVO_CHIP_TMDS,
  65.                 .name = "tfp410",
  66.                 .dvo_reg = DVOC,
  67.                 .slave_addr = TFP410_ADDR,
  68.                 .dev_ops = &tfp410_ops,
  69.         },
  70.         {
  71.                 .type = INTEL_DVO_CHIP_LVDS,
  72.                 .name = "ch7017",
  73.                 .dvo_reg = DVOC,
  74.                 .slave_addr = 0x75,
  75.                 .gpio = GMBUS_PORT_DPB,
  76.                 .dev_ops = &ch7017_ops,
  77.         }
  78. };
  79.  
  80. struct intel_dvo {
  81.         struct intel_encoder base;
  82.  
  83.         struct intel_dvo_device dev;
  84.  
  85.         struct drm_display_mode *panel_fixed_mode;
  86.         bool panel_wants_dither;
  87. };
  88.  
  89. static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
  90. {
  91.         return container_of(encoder, struct intel_dvo, base.base);
  92. }
  93.  
  94. static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
  95. {
  96.         return container_of(intel_attached_encoder(connector),
  97.                             struct intel_dvo, base);
  98. }
  99.  
  100. static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
  101. {
  102.         struct drm_i915_private *dev_priv = encoder->dev->dev_private;
  103.         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
  104.         u32 dvo_reg = intel_dvo->dev.dvo_reg;
  105.         u32 temp = I915_READ(dvo_reg);
  106.  
  107.         if (mode == DRM_MODE_DPMS_ON) {
  108.                 I915_WRITE(dvo_reg, temp | DVO_ENABLE);
  109.                 I915_READ(dvo_reg);
  110.                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
  111.         } else {
  112.                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
  113.                 I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
  114.                 I915_READ(dvo_reg);
  115.         }
  116. }
  117.  
  118. static int intel_dvo_mode_valid(struct drm_connector *connector,
  119.                                 struct drm_display_mode *mode)
  120. {
  121.         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
  122.  
  123.         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
  124.                 return MODE_NO_DBLESCAN;
  125.  
  126.         /* XXX: Validate clock range */
  127.  
  128.         if (intel_dvo->panel_fixed_mode) {
  129.                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
  130.                         return MODE_PANEL;
  131.                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
  132.                         return MODE_PANEL;
  133.         }
  134.  
  135.         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
  136. }
  137.  
  138. static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
  139.                                  struct drm_display_mode *mode,
  140.                                  struct drm_display_mode *adjusted_mode)
  141. {
  142.         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
  143.  
  144.         /* If we have timings from the BIOS for the panel, put them in
  145.          * to the adjusted mode.  The CRTC will be set up for this mode,
  146.          * with the panel scaling set up to source from the H/VDisplay
  147.          * of the original mode.
  148.          */
  149.         if (intel_dvo->panel_fixed_mode != NULL) {
  150. #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
  151.                 C(hdisplay);
  152.                 C(hsync_start);
  153.                 C(hsync_end);
  154.                 C(htotal);
  155.                 C(vdisplay);
  156.                 C(vsync_start);
  157.                 C(vsync_end);
  158.                 C(vtotal);
  159.                 C(clock);
  160.                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
  161. #undef C
  162.         }
  163.  
  164.         if (intel_dvo->dev.dev_ops->mode_fixup)
  165.                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
  166.  
  167.         return true;
  168. }
  169.  
  170. static void intel_dvo_mode_set(struct drm_encoder *encoder,
  171.                                struct drm_display_mode *mode,
  172.                                struct drm_display_mode *adjusted_mode)
  173. {
  174.         struct drm_device *dev = encoder->dev;
  175.         struct drm_i915_private *dev_priv = dev->dev_private;
  176.         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
  177.         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
  178.         int pipe = intel_crtc->pipe;
  179.         u32 dvo_val;
  180.         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
  181.         int dpll_reg = DPLL(pipe);
  182.  
  183.         switch (dvo_reg) {
  184.         case DVOA:
  185.         default:
  186.                 dvo_srcdim_reg = DVOA_SRCDIM;
  187.                 break;
  188.         case DVOB:
  189.                 dvo_srcdim_reg = DVOB_SRCDIM;
  190.                 break;
  191.         case DVOC:
  192.                 dvo_srcdim_reg = DVOC_SRCDIM;
  193.                 break;
  194.         }
  195.  
  196.         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);
  197.  
  198.         /* Save the data order, since I don't know what it should be set to. */
  199.         dvo_val = I915_READ(dvo_reg) &
  200.                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
  201.         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
  202.                    DVO_BLANK_ACTIVE_HIGH;
  203.  
  204.         if (pipe == 1)
  205.                 dvo_val |= DVO_PIPE_B_SELECT;
  206.         dvo_val |= DVO_PIPE_STALL;
  207.         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
  208.                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
  209.         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
  210.                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
  211.  
  212.         I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
  213.  
  214.         /*I915_WRITE(DVOB_SRCDIM,
  215.           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
  216.           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
  217.         I915_WRITE(dvo_srcdim_reg,
  218.                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
  219.                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
  220.         /*I915_WRITE(DVOB, dvo_val);*/
  221.         I915_WRITE(dvo_reg, dvo_val);
  222. }
  223.  
  224. /**
  225.  * Detect the output connection on our DVO device.
  226.  *
  227.  * Unimplemented.
  228.  */
  229. static enum drm_connector_status
  230. intel_dvo_detect(struct drm_connector *connector, bool force)
  231. {
  232.         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
  233.         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
  234. }
  235.  
  236. static int intel_dvo_get_modes(struct drm_connector *connector)
  237. {
  238.         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
  239.         struct drm_i915_private *dev_priv = connector->dev->dev_private;
  240.  
  241.         /* We should probably have an i2c driver get_modes function for those
  242.          * devices which will have a fixed set of modes determined by the chip
  243.          * (TV-out, for example), but for now with just TMDS and LVDS,
  244.          * that's not the case.
  245.          */
  246.         intel_ddc_get_modes(connector,
  247.                             &dev_priv->gmbus[GMBUS_PORT_DPC].adapter);
  248.         if (!list_empty(&connector->probed_modes))
  249.                 return 1;
  250.  
  251.         if (intel_dvo->panel_fixed_mode != NULL) {
  252.                 struct drm_display_mode *mode;
  253.                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
  254.                 if (mode) {
  255.                         drm_mode_probed_add(connector, mode);
  256.                         return 1;
  257.                 }
  258.         }
  259.  
  260.         return 0;
  261. }
  262.  
  263. static void intel_dvo_destroy(struct drm_connector *connector)
  264. {
  265.         drm_sysfs_connector_remove(connector);
  266.         drm_connector_cleanup(connector);
  267.         kfree(connector);
  268. }
  269.  
  270. static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
  271.         .dpms = intel_dvo_dpms,
  272.         .mode_fixup = intel_dvo_mode_fixup,
  273.         .prepare = intel_encoder_prepare,
  274.         .mode_set = intel_dvo_mode_set,
  275.         .commit = intel_encoder_commit,
  276. };
  277.  
  278. static const struct drm_connector_funcs intel_dvo_connector_funcs = {
  279.         .dpms = drm_helper_connector_dpms,
  280.         .detect = intel_dvo_detect,
  281.         .destroy = intel_dvo_destroy,
  282.         .fill_modes = drm_helper_probe_single_connector_modes,
  283. };
  284.  
  285. static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
  286.         .mode_valid = intel_dvo_mode_valid,
  287.         .get_modes = intel_dvo_get_modes,
  288.         .best_encoder = intel_best_encoder,
  289. };
  290.  
  291. static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
  292. {
  293.         struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
  294.  
  295.         if (intel_dvo->dev.dev_ops->destroy)
  296.                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
  297.  
  298.         kfree(intel_dvo->panel_fixed_mode);
  299.  
  300.         intel_encoder_destroy(encoder);
  301. }
  302.  
  303. static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
  304.         .destroy = intel_dvo_enc_destroy,
  305. };
  306.  
  307. /**
  308.  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
  309.  *
  310.  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
  311.  * chip being on DVOB/C and having multiple pipes.
  312.  */
  313. static struct drm_display_mode *
  314. intel_dvo_get_current_mode(struct drm_connector *connector)
  315. {
  316.         struct drm_device *dev = connector->dev;
  317.         struct drm_i915_private *dev_priv = dev->dev_private;
  318.         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
  319.         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
  320.         struct drm_display_mode *mode = NULL;
  321.  
  322.         /* If the DVO port is active, that'll be the LVDS, so we can pull out
  323.          * its timings to get how the BIOS set up the panel.
  324.          */
  325.         if (dvo_val & DVO_ENABLE) {
  326.                 struct drm_crtc *crtc;
  327.                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
  328.  
  329.                 crtc = intel_get_crtc_for_pipe(dev, pipe);
  330.                 if (crtc) {
  331.                         mode = intel_crtc_mode_get(dev, crtc);
  332.                         if (mode) {
  333.                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
  334.                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
  335.                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
  336.                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
  337.                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
  338.                         }
  339.                 }
  340.         }
  341.  
  342.         return mode;
  343. }
  344.  
  345. void intel_dvo_init(struct drm_device *dev)
  346. {
  347.         struct drm_i915_private *dev_priv = dev->dev_private;
  348.         struct intel_encoder *intel_encoder;
  349.         struct intel_dvo *intel_dvo;
  350.         struct intel_connector *intel_connector;
  351.         int i;
  352.         int encoder_type = DRM_MODE_ENCODER_NONE;
  353.  
  354.         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
  355.         if (!intel_dvo)
  356.                 return;
  357.  
  358.         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
  359.         if (!intel_connector) {
  360.                 kfree(intel_dvo);
  361.                 return;
  362.         }
  363.  
  364.         intel_encoder = &intel_dvo->base;
  365.         drm_encoder_init(dev, &intel_encoder->base,
  366.                          &intel_dvo_enc_funcs, encoder_type);
  367.  
  368.         /* Now, try to find a controller */
  369.         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
  370.                 struct drm_connector *connector = &intel_connector->base;
  371.                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
  372.                 struct i2c_adapter *i2c;
  373.                 int gpio;
  374.  
  375.                 /* Allow the I2C driver info to specify the GPIO to be used in
  376.                  * special cases, but otherwise default to what's defined
  377.                  * in the spec.
  378.                  */
  379.                 if (dvo->gpio != 0)
  380.                         gpio = dvo->gpio;
  381.                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
  382.                         gpio = GMBUS_PORT_SSC;
  383.                 else
  384.                         gpio = GMBUS_PORT_DPB;
  385.  
  386.                 /* Set up the I2C bus necessary for the chip we're probing.
  387.                  * It appears that everything is on GPIOE except for panels
  388.                  * on i830 laptops, which are on GPIOB (DVOA).
  389.                  */
  390.                 i2c = &dev_priv->gmbus[gpio].adapter;
  391.  
  392.                 intel_dvo->dev = *dvo;
  393.                 if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
  394.                         continue;
  395.  
  396.                 intel_encoder->type = INTEL_OUTPUT_DVO;
  397.                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
  398.                 switch (dvo->type) {
  399.                 case INTEL_DVO_CHIP_TMDS:
  400.                         intel_encoder->clone_mask =
  401.                                 (1 << INTEL_DVO_TMDS_CLONE_BIT) |
  402.                                 (1 << INTEL_ANALOG_CLONE_BIT);
  403.                         drm_connector_init(dev, connector,
  404.                                            &intel_dvo_connector_funcs,
  405.                                            DRM_MODE_CONNECTOR_DVII);
  406.                         encoder_type = DRM_MODE_ENCODER_TMDS;
  407.                         break;
  408.                 case INTEL_DVO_CHIP_LVDS:
  409.                         intel_encoder->clone_mask =
  410.                                 (1 << INTEL_DVO_LVDS_CLONE_BIT);
  411.                         drm_connector_init(dev, connector,
  412.                                            &intel_dvo_connector_funcs,
  413.                                            DRM_MODE_CONNECTOR_LVDS);
  414.                         encoder_type = DRM_MODE_ENCODER_LVDS;
  415.                         break;
  416.                 }
  417.  
  418.                 drm_connector_helper_add(connector,
  419.                                          &intel_dvo_connector_helper_funcs);
  420.                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
  421.                 connector->interlace_allowed = false;
  422.                 connector->doublescan_allowed = false;
  423.  
  424.                 drm_encoder_helper_add(&intel_encoder->base,
  425.                                        &intel_dvo_helper_funcs);
  426.  
  427.                 intel_connector_attach_encoder(intel_connector, intel_encoder);
  428.                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
  429.                         /* For our LVDS chipsets, we should hopefully be able
  430.                          * to dig the fixed panel mode out of the BIOS data.
  431.                          * However, it's in a different format from the BIOS
  432.                          * data on chipsets with integrated LVDS (stored in AIM
  433.                          * headers, likely), so for now, just get the current
  434.                          * mode being output through DVO.
  435.                          */
  436.                         intel_dvo->panel_fixed_mode =
  437.                                 intel_dvo_get_current_mode(connector);
  438.                         intel_dvo->panel_wants_dither = true;
  439.                 }
  440.  
  441.                 drm_sysfs_connector_add(connector);
  442.                 return;
  443.         }
  444.  
  445.         drm_encoder_cleanup(&intel_encoder->base);
  446.         kfree(intel_dvo);
  447.         kfree(intel_connector);
  448. }
  449.