drivers/gpu/drm/i915/intel_modes.c

   1 /*
   2  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   3  * Copyright (c) 2007 Intel Corporation
   4  *   Jesse Barnes <jesse.barnes@intel.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <linux/i2c.h>
  27 #include <linux/fb.h>
  28 #include "drmP.h"
  29 #include "intel_drv.h"
  30 #include "i915_drv.h"
  31
  32 /**
  33  * intel_ddc_probe
  34  *
  35  */
  36 bool intel_ddc_probe(struct intel_output *intel_output)
  37 {
  38         u8 out_buf[] = { 0x0, 0x0};
  39         u8 buf[2];
  40         int ret;
  41         struct i2c_msg msgs[] = {
  42                 {
  43                         .addr = 0x50,
  44                         .flags = 0,
  45                         .len = 1,
  46                         .buf = out_buf,
  47                 },
  48                 {
  49                         .addr = 0x50,
  50                         .flags = I2C_M_RD,
  51                         .len = 1,
  52                         .buf = buf,
  53                 }
  54         };
  55
  56         intel_i2c_quirk_set(intel_output->base.dev, true);
  57         ret = i2c_transfer(intel_output->ddc_bus, msgs, 2);
  58         intel_i2c_quirk_set(intel_output->base.dev, false);
  59         if (ret == 2)
  60                 return true;
  61
  62         return false;
  63 }
  64
  65 /**
  66  * intel_ddc_get_modes - get modelist from monitor
  67  * @connector: DRM connector device to use
  68  *
  69  * Fetch the EDID information from @connector using the DDC bus.
  70  */
  71 int intel_ddc_get_modes(struct intel_output *intel_output)
  72 {
  73         struct edid *edid;
  74         int ret = 0;
  75
  76         intel_i2c_quirk_set(intel_output->base.dev, true);
  77         edid = drm_get_edid(&intel_output->base, intel_output->ddc_bus);
  78         intel_i2c_quirk_set(intel_output->base.dev, false);
  79         if (edid) {
  80                 drm_mode_connector_update_edid_property(&intel_output->base,
  81                                                         edid);
  82                 ret = drm_add_edid_modes(&intel_output->base, edid);
  83                 intel_output->base.display_info.raw_edid = NULL;
  84                 kfree(edid);
  85         }
  86
  87         return ret;
  88 }